MCQ 11 Mark
What does a battery contain?
- ✓
A minimum of two terminals.
- B
A minimum of three terminals.
- C
- D
AnswerCorrect option: A. A minimum of two terminals.
A minimum of two terminals.
View full question & answer→MCQ 21 Mark
Which of the following represent a cell?
AnswerCorrect option: A. $(i).$
Figure $(i)$ represents a battery.
View full question & answer→MCQ 31 Mark
Which of the following does $NOT$ conduct electricity?
AnswerCeramic articles do not conduct electricity.
View full question & answer→MCQ 41 Mark
What are the two places on a battery to which the wires can be attached called?
AnswerWires in a circuit are connected to the two terminals called the positive and the negative terminals.
View full question & answer→MCQ 51 Mark
When a wire is connected through a source of electricity, particles moving through the wire are:
AnswerWhen a conductor is connected through a cell electric current (or flow of electrons) starts flowing through it.
View full question & answer→MCQ 61 Mark
It why is tungsten used as a filament in electric bulbs?
- A
- B
- ✓
It has a high melting point.
- D
It has a low melting point.
AnswerCorrect option: C. It has a high melting point.
Tungsten has a high melting point. Hence, it is used as a filament in electric bulbs.
View full question & answer→MCQ 71 Mark
DIRECTIONS: Read the passage $(s)$ given below and answer the questions that follow. Passage $-1$ Those materials which do not allows electric current to pass through them are called insulators e.g., air, cork, rubber, thermocole, paper, etc. Insulators are used for covering electrical wires, plug tops, switches and other parts of electrical appliances. Air is an insulator of electricity because air have no:
Answer Free electrons are required to conduct electricity.
View full question & answer→MCQ 81 Mark
Tube lights are preferred to bulbs mainly because:
- A
- B
- C
Bulbs get fused easily/ frequently.
- ✓
AnswerBulbs produce large umbral shadows when compared to tube lights. Hence, tube lights are preferred to bulbs.
View full question & answer→MCQ 91 Mark
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion $A$" and the other labelled as "Reason $R$". You are to examine these two statements carefully and decide if the Assertion $A$ and Reason $R$ are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion A: In a closed electric circuit the current passes from one terminal of the electric cell to the other terminal. Reason $(R):$ Generally the metal disc of a cell acts as positive terminal.
- A
Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
- B
Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
- ✓
$A$ is true but $R $ is false.
- D
$A$ is false but $R$ is true.
AnswerCorrect option: C. $A$ is true but $R $ is false.
$A$ is true but $R$ is false.
View full question & answer→MCQ 101 Mark
To prevent electric shocks, the metallic electrical wires are covered with:
AnswerPlastic is an insulator of electricity.
View full question & answer→MCQ 111 Mark
Which part of the bulb is an insulator?
Answer$P$ is the glass cover, $Q$ is the filament, $R$ is the supporting wires, while $S$ is the positive terminal of the bulb.
View full question & answer→MCQ 121 Mark
Electric wires are made of:
AnswerBoth copper and aluminium are conductors of electricity.
View full question & answer→MCQ 131 Mark
Select the object which can be placed between the open ends to light up the bulb in an electric circuit.
- A
Needle of sewing machine.
- B
- C
- ✓
Any one of the above three.
AnswerCorrect option: D. Any one of the above three.
All these are conductors and if placed between the open ends, the bulb will light up.
View full question & answer→MCQ 141 Mark
Steel is a magnetic material because:
- A
- B
- C
It can be converted into a magnet.
- ✓
View full question & answer→MCQ 151 Mark
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage An electric cell is a source of electricity. Such cells are used in alarm clocks, wrist watches, transistor radios, cameras, etc. A cell is generally provided with a metal cap that generally acts as:
- ✓
- B
- C
Sometimes positive and sometimes negative terminal.
- D
View full question & answer→MCQ 161 Mark
Paheli is running short of connecting wires. To complete an electric circuit, she may use a
AnswerSince, a steel spoon is a conductor of electricity therefore, current will pass through it. So, Paheli can use a steel spoon to complete the circuit.
View full question & answer→MCQ 171 Mark
Current will flow in a circuit containing:
- A
A rubber wire, an open switch, a cell.
- B
A closed switch, a rubber wire, a cell.
- ✓
A copper wire, a closed switch, a cell.
- D
AnswerCorrect option: C. A copper wire, a closed switch, a cell.
A copper wire, a closed switch, a cell.
View full question & answer→MCQ 181 Mark
Which of the following statements is correct?
- A
We should use power sockets in our school to perform science experiments.
- ✓
We should use electric cell to perform experiments.
- C
Power sockets provide much less electricity than a dry cell.
- D
AnswerCorrect option: B. We should use electric cell to perform experiments.
We should use electric cell to perform experiments.
View full question & answer→MCQ 191 Mark
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion $A$" and the other labelled as "Reason $R$". You are to examine these two statements carefully and decide if the Assertion $A$ and Reason $R$ are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion $A:$ An electric cell has two terminals. Reason $(R):$ One of the terminals is called the positive terminal and the other is called the negative terminal.
- A
Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
- ✓
Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
- C
$A$ is true but $R$ is false.
- D
$A$ is false but $R$ is true.
AnswerCorrect option: B. Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
Both Assertion $A$ and Reason $R$ are correct but Reason $R$ is not the correct explanation of Assertion $A.$
View full question & answer→MCQ 201 Mark
Choose from the options $a, b, c$ and $d$ given in Fig. the figure which shows the correct direction of current.
Answer
Current always starts from positive terminal and end at negative terminal of the battery. This is conventional direction of flow of current in a circuit.
View full question & answer→MCQ 211 Mark
Direction: Observe the given figure and answer the following question.
Which of the following statements is correct regarding the maximum brightness of the bulb used in the circuit?
- ✓
A similar battery is connected between the probes in same order.
- B
A similar battery is connected between the probes in reverse order.
- C
A similar bulb is connected between the probes.
- D
AnswerCorrect option: A. A similar battery is connected between the probes in same order.
Brightness of bulb can be increased by increasing the current through the bulb. This can be achieved by connecting a similar battery in the circuit.
View full question & answer→MCQ 221 Mark
North Pole of a magnetic needle is usually painted ___________.
MCQ 231 Mark
Figure Based Questions The filament of a bulb will glow in the given electric circuit, if the plug key is:
- A
- ✓
- C
Both $(a)$ and $(b).$
- D
Answer When the plug key will be closed, electric circuit will be complete and the filament of the bulb will glow.
View full question & answer→MCQ 241 Mark
In the given circuit if $X$ is the positive terminal and $Y$ is the negative terminal then flow of current will be from:
- A
$Y$ to $X.$
- ✓
$X$ to $Y.$
- C
Both $(a)$ and $(b).$
- D
Either $(a) $ or $(b).$
AnswerCorrect option: B. $X$ to $Y.$
$X$ to $Y.$
View full question & answer→MCQ 251 Mark
In a circuit with one bulb, another bulb is added in series. What happens to the bulbs when current is passed?
AnswerA circuit has one bulb, if another bulb is connected in series, the brightness of the two bulbs will be less than the brightness with which the single bulb was glowing earlier.
View full question & answer→MCQ 261 Mark
A battery is connected to an electric lamp. If one more identical lamp is connected in series with the first, what will happen to the current?
MCQ 271 Mark
How many terminals are there in a switch$?$
View full question & answer→MCQ 281 Mark
Manu connected three bulbs to a cell as shown in figure. She found that filament of bulb is broken. Which of the following statements is correct?
AnswerCorrect option: D. None of the bulbs will glow.
Bulb $Q$ is fused because its filament is broken. So none of the bulb will glow.
View full question & answer→MCQ 291 Mark
An electric cell produces electricity from the:
- A
Filament present inside it.
- B
Power socket present outside it.
- ✓
Chemicals stored inside it.
- D
Insulator present inside it.
AnswerCorrect option: C. Chemicals stored inside it.
Chemicals stored inside it.
View full question & answer→MCQ 301 Mark
Which of the following statements is incorrect7:
AnswerCorrect option: C. All dry cells are rechargeable.
Only some dry cells are not rechargeable.
View full question & answer→MCQ 311 Mark
Combination of two or more cells is called:
MCQ 321 Mark
Which of the following is used to stop the flow of electric current in an electric circuit when it is required?
MCQ 331 Mark
- A
Any arrangement in which we have the two terminals of a cell connected to each others by a conducting wire.
- B
Any arrangement in which we have the two terminals of a cell connected to each other by a non- conducting wire.
- ✓
Any arrangement in which we have the two terminals of a cell connected to the two terminals of a bulb.
- D
Any arrangement in which two terminals of a bulb are connected to each other, through a switch, with the help of connecting wires.
AnswerCorrect option: C. Any arrangement in which we have the two terminals of a cell connected to the two terminals of a bulb.
Any arrangement in which we have the two terminals of a cell connected to the two terminals of a bulb.
View full question & answer→MCQ 341 Mark
Which of the following energy conversions take place in a torch?
- A
Electrical $\rightarrow$ chemical $\rightarrow$ light.
- ✓
Chemical $\rightarrow $ electrical $\rightarrow $ light.
- C
Electrical $\rightarrow$ light $\rightarrow$ chemical.
- D
Light $\rightarrow$ chemical $\rightarrow$ electrical.
AnswerCorrect option: B. Chemical $\rightarrow $ electrical $\rightarrow $ light.
A torchlight is powered by dry cells which convert chemical energy to electrical energy. This in turn, is converted into light energy by the torch light.
View full question & answer→MCQ 351 Mark
Choose the correct option for the given figure.
AnswerCorrect option: B. Magnet $X$ and $Y$ will repel each other.
Magnet $X$ and $Y$ will repel each other.
View full question & answer→MCQ 361 Mark
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion $A$" and the other labelled as "Reason $R$". You are to examine these two statements carefully and decide if the Assertion $A$ and Reason $R$ are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion $(A):$ Bulbs filament is made up of conductors. Reason $(R):$ Tungsten is a good conductor of electricity.
- A
Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A).$
- ✓
Both $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A).$
- C
$A$ is true but $R$ is false.
- D
$A$ is false but $R$ is true.
AnswerCorrect option: B. Both $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A).$
Both $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A).$
View full question & answer→MCQ 371 Mark
Which of the following magnets has only one pole?
MCQ 381 Mark
To protect the user, part$(s) $__________ of the plug as shown in the figure must be made of electrical insulators.
- A
$P$ only.
- B
$R$ only.
- ✓
$R$ and $S.$
- D
$Q$ and $S.$
AnswerCorrect option: C. $R$ and $S.$
The plug cover $R$ and connecting wires cover $S$ should be made of electrical insulators.
View full question & answer→MCQ 391 Mark
"Do not handle electric wires with your bare hands. Wear rubber gloves," said Mr Gupta. Which of the following statements is not true about what Mr. Gupta commented?
- A
You will get electrocuted if you handle live wires.
- B
The rubber glove is a good insulator to protect us from electric shocks.
- ✓
The rubber gloves control the electric current flow.
- D
Electricity cannot flow through rubber.
AnswerCorrect option: C. The rubber gloves control the electric current flow.
The rubber gloves are bad conductors of electricity. Hence, they prevent electric current to enter in our body and protect us from electric shocks.
View full question & answer→MCQ 401 Mark
How many terminals does a cell has$?$
View full question & answer→MCQ 411 Mark
The symbol of an open switch is shown in:
AnswerCorrect option: C. Both figure $(i)$ and figure $(ii).$
Both figure $(i)$ and figure $(ii).$
View full question & answer→MCQ 421 Mark
What is the function of the component shown above?
- A
It is used to connect the bulb to the other components in the circuit.
- B
It provides the energy for the bulb to glow.
- ✓
It can break a circuit, interrupting the current or diverting it from one conductor to another.
- D
It measures the current in a circuit.
AnswerCorrect option: C. It can break a circuit, interrupting the current or diverting it from one conductor to another.
It can break a circuit, interrupting the current or diverting it from one conductor to another.
View full question & answer→MCQ 431 Mark
DIRECTIONS: Read the passage $(s)$ given below and answer the questions that follow. Passage $- 3$ An arrangement in which two terminals of an electric cell are connected to two terminals of the bulb is known as electric circuit. Current flows from positive to negative terminal in closed circuit. Filament of bulb is made up of tungsten. The filament of bulb is made of:
- A
- ✓
- C
Both the above are correct.
- D
None of these is correct.
View full question & answer→MCQ 441 Mark
Why are the electric wires used in homes usually covered with materials like plastic or rubber?
- A
- B
- ✓
To prevent shock and short circuits.
- D
To make them look beautiful.
AnswerCorrect option: C. To prevent shock and short circuits.
Electric wires used in homes generally have a plastic or rubber covering so as to prevent shocks when we touch them. Insulation also prevents the two live wires coming in contact causing a short circuit.
View full question & answer→MCQ 451 Mark
Which part of the bulb is made up of an insulator material?
MCQ 461 Mark
Electric cell is used in:
AnswerElectric cell is a source of electricity. It is used in transistors, cameras, mobile phones, etc.
View full question & answer→MCQ 471 Mark
The given figure is showing:
MCQ 481 Mark
Which of the following is a type of magnet?
MCQ 491 Mark
In the circuit shown in Fig. when the switch is moved to $‘ON’$ position:
- A
The bulb $A$ will glow first.
- B
The bulb $B$ will glow first.
- C
The bulb $C$ will glow first.
- ✓
All bulbs will glow together.
AnswerCorrect option: D. All bulbs will glow together.
All the bulbs will glow together because current will reach simultaneously to all the bulbs, when the switch is moved to $ON$ position.
View full question & answer→MCQ 501 Mark
What happens to a circuit when the switch is in the $OFF$ position$?$
- A
- ✓
There is a gap in the circuit.
- C
Electricity flows continuously.
- D
Electricity flows intermittently.
AnswerCorrect option: B. There is a gap in the circuit.
When a switch in the circuit is in the $OFF$ position, there is a gap (or discontinuity) in the circuit which does not allow flow of electricity in the circuit.
View full question & answer→MCQ 511 Mark
- A
Electric energy into chemical energy.
- B
Heat energy into electric energy.
- ✓
Chemical energy into electric energy.
- D
Electric energy into light energy.
AnswerCorrect option: C. Chemical energy into electric energy.
The chemicals in the cell react to produce current.
View full question & answer→MCQ 521 Mark
In an electric circuit, the two terminals of the electric cell are:
- A
Connected directly to each other.
- B
Connected to the filament of the bulb.
- ✓
Connected to the two terminals of the bulb.
- D
All the above are correct.
AnswerCorrect option: C. Connected to the two terminals of the bulb.
Connected to the two terminals of the bulb.
View full question & answer→MCQ 531 Mark
Which of the following is correct about brass?
- Brass is an alloy.
- Brass is a magnetic material.
- Brass is a non-magnetic material.
- Brass is used in making plastic bottles.
- A
$ii$ and $iii.$
- B
$i $ and $ii.$
- ✓
$i$ and $iii.$
- D
$ii $ and $iv.$
AnswerCorrect option: C. $i$ and $iii.$
View full question & answer→MCQ 541 Mark
Which one of the following statements is correct?
Statement $1: $ Metal cap of a dry cell is positive terminal of the cell.
Statement $2:$ Metal cap of a dry cell is negative terminal of the cell.
- ✓
Statement $1.$
- B
Statement $2.$
- C
Both statements are correct.
- D
Both statements are incorrect.
AnswerCorrect option: A. Statement $1.$
Statement $1.$
View full question & answer→MCQ 551 Mark
Choose the best conductor of electricity:
AnswerSilver is the best conductor of electricity.
View full question & answer→MCQ 561 Mark
Which of the following will allow electric current to pass through them?
MCQ 571 Mark
Which is an example of an insulator:
AnswerAluminium and tap water are conductors of heat.
View full question & answer→MCQ 581 Mark
Electric wires are covered with:
MCQ 591 Mark
The S.I. unit of charge is:
AnswerThe $S.I.$ unit of charge is coulomb.
View full question & answer→MCQ 601 Mark
The symbol for a closed switch is shown in:
AnswerCorrect option: B. Figure $(ii).$
Figure $(ii).$
View full question & answer→MCQ 611 Mark
Identify the symbol of a fuse.
AnswerThe symbol of a fuse is:
View full question & answer→MCQ 621 Mark
The diagram below shows an incomplete circuit.
Which item would allow the bulb to light up if it were used to connect point $A$ to point $B?$ AnswerAs metal coin is a good conductor of electricity.
View full question & answer→MCQ 631 Mark
Electric heaters used for cooking have a filament or a heating co placed on a plate made up of clay. Why is this so?
- It is a bad conductor of heat.
- It is a bad conductor of electricity.
- It is porous.
- ✓
Only $(i)$ and $(ii).$
- B
Only $(ii)$ and $(iii).$
- C
Only $(i)$ and $(iii).$
- D
$(i), (ii)$ and $(iii).$
AnswerCorrect option: A. Only $(i)$ and $(ii).$
Clay is a bad conductor of heat and electricity. In order to avoid shock due to the flow of current and also to avoid the instrument getting heated, a clay stand is used to place the coil or filament.
View full question & answer→MCQ 641 Mark
Which one of the following is an insulator?
MCQ 651 Mark
Which of the following is the symbol of an electric bulb?
AnswerThe symbol of an electric bulb is shown below.
View full question & answer→MCQ 661 Mark
What for is a tester used by the electrician?
- ✓
To test the presence of electric current.
- B
To find the amount of electric current passing through an electric circuit.
- C
To measure the rate of flow of current through an electric circuit..
- D
AnswerCorrect option: A. To test the presence of electric current.
To test the presence of electric current.
View full question & answer→MCQ 671 Mark
How many terminals does a bulb has?
MCQ 681 Mark
The diagram below shows an electric circuit.
Chemical energy from the battery is changed into electrical energy. This electrical energy is then changed to which type of energy?
- A
Electrical energy into chemical energy.
- B
Electrical energy into heat energy.
- ✓
Electric energy into light energy.
- D
Electric energy into sound energy.
AnswerCorrect option: C. Electric energy into light energy.
Electric bulb converts electrical energy into light energy.
View full question & answer→MCQ 691 Mark
Non metals like ________ and ________ are conductor of electricity.
MCQ 701 Mark
DIRECTIONS: Read the following three statements carefully and choose the correct option.
Statement-$1$: There is very less current flows when an electric circuit is open.
Statement-$2$: When the switch of an electric circuit is in off mode, the circuit is said to be open.
Statement-$3$: One can get a shock in open circuit.
AnswerCorrect option: A. Statement $(1)$ and $(3)$ are incorrect while statement $(2)$ is correct.
Statement $(1)$ and $(3)$ are incorrect while statement $(2)$ is correct.
View full question & answer→MCQ 711 Mark
Why is it unsafe to switch on a bulb with wet hands?
- ✓
- B
- C
- D
The wires are disconnected.
AnswerIt is unsafe to switch on a bulb with wet hands because it can give a shock.
View full question & answer→MCQ 721 Mark
The diagram shows identical lamps $X$ and $Y$ connected in series with a battery. The lamps light with normal brightness.
If a third lamp $Z$ is connected in parallel with lamp $X,$ then what will happens to the brightness of the lamp $V?$ - ✓
- B
- C
- D
Very dim (cannot be seen).
AnswerThe third lamp $Z$ is connected parallel to $X,$ so the current gets divided among $X$ and $Z.$ So both bulbs $X$ and $Z$ light dimmer and the bulb $Y$ lights brighter than earlier because current through it increases.
View full question & answer→MCQ 731 Mark
Which metal is used for making electric wires?
AnswerCopper is used for making electric wires.
View full question & answer→MCQ 741 Mark
__________ is the sure test of magnetism.
MCQ 751 Mark
Name the cells in human body which look like electric wires.
AnswerNeurons is other name of nerve cell.
View full question & answer→MCQ 761 Mark
Filament of a torch bulb is:
- A
- B
Metal tip at the centre of the base.
- C
- ✓
AnswerFilament of a torch bulb is a thin wire which gives off light. It is fixed to two thicker wires which provides support to it.
One of these thick wires is connected to the metal case at the base of the bulb and the other thick wire is connected to the metal tip at the centre of the base.
View full question & answer→MCQ 771 Mark
Select the one that is an excellent insulator?
AnswerRubber is considered as excellent insulator.
View full question & answer→MCQ 781 Mark
What is the filament of an electric bulb' usually made up of?
- ✓
A thin wire with many coils.
- B
A thick wire with many coils.
- C
- D
AnswerCorrect option: A. A thin wire with many coils.
The filament of an electric bulb is usually made up of a thin wire with many coils.
View full question & answer→MCQ 791 Mark
In a closed electric circuit, current flows:
- A
In the direction of flow of electrons.
- ✓
In the direction opposite to the flow of electrons.
- C
Negative terminal to positive terminal of cells.
- D
AnswerCorrect option: B. In the direction opposite to the flow of electrons.
In a closed circuit current flows in the direction opposite to the flow of electrons.
View full question & answer→MCQ 801 Mark
- A
A simple device that is used to break the electric circuit.
- B
A simple device that is used to complete the electric circuit.
- ✓
A simple device that is used to break or to complete the electric circuit.
- D
None of the above is correct.
AnswerCorrect option: C. A simple device that is used to break or to complete the electric circuit.
A simple device that is used to break or to complete the electric circuit.
View full question & answer→MCQ 811 Mark
North pole of a magnet can be identified by:
- A
- B
Another magnet without marked poles.
- C
- ✓
Another magnet having marked north and South Pole.
AnswerCorrect option: D. Another magnet having marked north and South Pole.
Another magnet having marked north and South Pole.
View full question & answer→MCQ 821 Mark
A cell is represented by symbol:
MCQ 831 Mark
Which is the positive terminal in an electric cell?
MCQ 841 Mark
- A
$(i)$ and $(ii).$
- B
$(ii)$ and $(iii).$
- C
$(iii)$ and $(iv).$
- ✓
$(ii)$ and $(iv).$
AnswerCorrect option: D. $(ii)$ and $(iv).$
$(ii)$ and $(iv).$
View full question & answer→MCQ 851 Mark
Look at the following two diagrams and answer in which case bulb will glow?
- A
Both $(i)$ and $(ii).$
- ✓
Only $(i).$
- C
Only $(ii).$
- D
None of the above is correct.
AnswerCorrect option: B. Only $(i).$
In $(ii)$ the switch is not on.
View full question & answer→MCQ 861 Mark
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion $A$" and the other labelled as "Reason $R$". You are to examine these two statements carefully and decide if the Assertion $A$ and Reason $R$ are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion $(A):$ Connecting wire is used to connect all components of electric circuit. Reason $(R):$ Connecting wire is made of electric conductor.
- ✓
Both $(A)$ and $R$ are true and $R$ is the correct explanation of $(A).$
- B
Both $(A)$ and $R$ are true but $R$ is not the correct explanation of $(A).$
- C
$A$ is true but $R$ is false.
- D
$A$ is false but $R$ is true.
AnswerCorrect option: A. Both $(A)$ and $R$ are true and $R$ is the correct explanation of $(A).$
Both $(A)$ and $R$ are true and $R$ is the correct explanation of $(A).$
View full question & answer→MCQ 871 Mark
In an electric circuit shown below the direction of current is taken from:
- A
As shown in $(i).$
- ✓
As shown in $(ii).$
- C
- D
None of the above is correct.
AnswerCorrect option: B. As shown in $(ii).$
As shown in $(ii).$
View full question & answer→MCQ 881 Mark
In the following arrangement shown in Fig. the bulb will not glow if the ends $A$ and $B$ are connected with:
AnswerSince, a plastic clip is an insulator, so current will not pass through it and bulb will not glow in this case. However, a steel spoon, a metal clip and a copper wire are conductors of electricity.
View full question & answer→MCQ 891 Mark
A navigating device used by pilots is:
MCQ 901 Mark
Plastic, rubber, paper are examples of:
MCQ 911 Mark
Which one of the following statements is correct?
Statement $1:$ Electricity is a form of energy.
Statement $2:$ Electrical energy can be converted into various other forms of energy.
- A
Statement $1.$
- B
Statement $2.$
- ✓
Both statements are correct.
- D
Both statements are incorrect.
AnswerCorrect option: C. Both statements are correct.
Both statements are correct.
View full question & answer→MCQ 921 Mark
Energy used by the following appliances to run is:
MCQ 931 Mark
DIRECTIONS: Read the following three statements carefully and choose the correct option.
Statement-$1$: If a human high tension wire he will get electric shock.
Statement-$2$: Transmission wires carry a very low voltage current.
Statement-$3$: A bird sitting on a bare high power transmission wire feels a very feeble current.
AnswerCorrect option: B. Statement $(1)$ and $(2)$ are incorrect while $(3)$ is correct.
Statement $(1)$ and $(2)$ are incorrect while $(3)$ is correct.
View full question & answer→MCQ 941 Mark
The electric current passes from one terminal to the other terminal of the electric cell, when:
- A
Electric circuit is open.
- ✓
Electric circuit is closed.
- C
Electric circuit is provided with a switch.
- D
All the above are correct.
AnswerCorrect option: B. Electric circuit is closed.
Electric circuit is closed.
View full question & answer→MCQ 951 Mark
DIRECTIONS: Read the passage $(s)$ given below and answer the questions that follow. Passage$ - 2$ An electric bulb has a filament that is connected to the terminals. The two terminals of filament are fixed with two thick wires provides support to it. These terminals are fixed in such a manner that they do not touch each other. Filament is:
- A
A thin wire that gives off light when bulb is switched on.
- B
Fixed to two thick wires which provides support to it.
- ✓
Both the above are correct.
- D
None of these is correct.
AnswerCorrect option: C. Both the above are correct.
Both the above are correct.
View full question & answer→MCQ 961 Mark
Which one of the following is a conductor of electricity?
MCQ 971 Mark
- A
A combination of two or more cells.
- B
- C
Used to control the flow of current.
- ✓
An instrument used for measuring the magnitude of current.
AnswerCorrect option: D. An instrument used for measuring the magnitude of current.
An ammeter is an instrument which is used for measuring the magnitude of current in a closed circuit. It is always connected in series to the circuit.
View full question & answer→MCQ 981 Mark
The diagram below shows a bulb and a wire attached to a battery.
Why would this bulb be lit?
- A
The battery is out of energy.
- B
The bulb is out of energy.
- C
- ✓
AnswerIn an electric circuit current flows only when the circuit is closed.
View full question & answer→MCQ 991 Mark
In which of these circuits will the bulb or bulbs glow the brightest?
- A
A simple circuit with one bulb and one cell.
- ✓
A simple circuit with one bulb and two cells.
- C
A simple circuit with two bulbs and one cell.
- D
A simple circuit with two bulbs and two cells.
AnswerCorrect option: B. A simple circuit with one bulb and two cells.
A simple circuit with one bulb and two cells glows the brightest.
View full question & answer→MCQ 1001 Mark
Nidhi connected two bulbs across two cells in a simple circuit. What should Nidhi do to make the bulbs glow dimmer?
- A
Replace one cell with a piece of chalk.
- ✓
Replace one cell with a piece of wire.
- C
Replace one bulb with a piece of wire.
- D
Replace one bulb with another cell.
AnswerCorrect option: B. Replace one cell with a piece of wire.
The amount of current produced by two cells is more as compared to a single cell. Thus, when a cell is replaced in a circuit with a wire, the bulbs glow dimmer.
View full question & answer→MCQ 1011 Mark
If there is gap in a circuit, the circuit is known as:
MCQ 1021 Mark
Which of the following statements is true?
- A
Electricity can be created.
- B
Electricity flows in a circuit with gaps.
- ✓
A cell converts chemical energy to electrical energy.
- D
A cell consists of three terminals.
AnswerCorrect option: C. A cell converts chemical energy to electrical energy.
A cell has chemicals m it. It converts chemical energy to electrical energy.
View full question & answer→MCQ 1031 Mark
Connecting wire is made of electric:
- ✓
- B
- C
Both $(a)$ and $(b).$
- D
AnswerConnecting wire is used to connect all the components of electric circuit so that electric current can flow through them. Thus, it is bound to made up of electric conductor.
View full question & answer→MCQ 1041 Mark
In an electric bulb, light is produced due to the glowing of:
- A
The glass case of the bulb.
- ✓
- C
The thick wires supporting the filament.
- D
Gases inside glass case of the bulb.
AnswerIn an electric bulb, its thin filament glows and gives off light and heat.
View full question & answer→MCQ 1051 Mark
Look at the figure given below.
What do you observe when the switch is closed?
- ✓
- B
Electrical energy is converted into sound energy.
- C
- D
Light energy is converted into heat energy.
AnswerWhen the switch is closed, electrical energy flows through the wires to the bulb which lights up.
View full question & answer→MCQ 1061 Mark
The bulb in a circuit glows when electric current:
- ✓
Flows through its filament.
- B
Flows through the glass covering.
- C
Stops flowing to the bulb.
- D
Flows into the air through the bulb.
AnswerCorrect option: A. Flows through its filament.
The bulb in a circuit glows when electric current flows through the filament of the bulb.
View full question & answer→MCQ 1071 Mark
If we touch a live wire carrying current, we get a shock. This is because our body is a/ an:
- ✓
Conductor of electricity.
- B
Insulator of electricity.
- C
- D
Both $(b)$ and $(c).$
AnswerCorrect option: A. Conductor of electricity.
Human body is a good conductor of electricity. So, the current passes through it and gets earthed and gives us a shock in the process.
View full question & answer→MCQ 1081 Mark
Which of these are good electrical insulators?
- A
- ✓
- C
Pure water, wood, silver.
- D
AnswerRubber, glass and wood are good electrical insulators.
View full question & answer→MCQ 1091 Mark
To make an electric circuit a closed circuit should be provided with a bulb having a:
MCQ 1101 Mark
In the following circuit the flow of current is in which route$?$
AnswerCorrect option: A. $CBED.$
$C$ is the positive terminal of the cell and $D$ is the negative terminal of the cell.
View full question & answer→MCQ 1111 Mark
Which of the following will attract a magnet?
MCQ 1121 Mark
- ✓
Two terminals and one filament.
- B
Two terminals and two filaments.
- C
Multiple terminals and single filament.
- D
Single terminal and single filament.
AnswerCorrect option: A. Two terminals and one filament.
A bulb has a filament which glows and two terminals which are joined to two terminals of the battery.
View full question & answer→MCQ 1131 Mark
DIRECTIONS: Read the passage $(s)$ given below and answer the questions that follow.
Passage -$1$ Those materials which do not allows electric current to pass through them are called insulators e.g., air, cork, rubber, thermocole, paper, etc. Insulators are used for covering electrical wires, plug tops, switches and other parts of electrical appliances. Covers of electric plugs are made up of:
AnswerCovers of electric plugs are made up of insulators because insulators do not allow electric current to pass through.
View full question & answer→MCQ 1141 Mark
Identify the circuit diagram in which the bulb does $NOT$ light up.
- A
Only $P$ and $Q.$
- ✓
Only $Q$ and $R.$
- C
Only $R$ and $P.$
- D
$P, Q$ and $R.$
AnswerCorrect option: B. Only $Q$ and $R.$
In circuit $P\rightarrow $The bulb glows as it is a complete circuit.
In circuit $Q\rightarrow $ There is no cell and so no current flows to light up the bulb.
In circuit $R \rightarrow $ The filament is broken in the bulb.
So, the bulb does not light up.
View full question & answer→MCQ 1151 Mark
DIRECTIONS: Read the passage $(s)$ given below and answer the questions that follow. Passage$ - 2$ An electric bulb has a filament that is connected to the terminals. The two terminals of filament are fixed with two thick wires provides support to it. These terminals are fixed in such a manner that they do not touch each other. Where is the filament fixed in the electric bulb?
- A
Near the positive terminal.
- B
Near the negative terminal.
- ✓
- D
None of the above is correct.
View full question & answer→MCQ 1161 Mark
Which components are required to make a simple electric circuit to light a bulb?
- A
- B
- C
- ✓
Wires, a cell, a bulb and a switch.
AnswerCorrect option: D. Wires, a cell, a bulb and a switch.
A simple electric circuit consists of connecting wires/a cell/a bulb and a switch.
View full question & answer→MCQ 1171 Mark
What is the source of electricity in the satellites?
AnswerSolar energy can be used directly by solar cells to produce electricity for use in satellites.
View full question & answer→MCQ 1181 Mark
It is a simple device used in electric circuits to make or break the electric circuit. It is:
MCQ 1191 Mark
Longer line on a battery symbol in a circuit drawn on paper represents the:
MCQ 1201 Mark
Which of these will generate electric current when kept in sunlight but not in the dark?
AnswerA solar cell can generate electric current when kept in sunlight but not when kept in the dark.
View full question & answer→MCQ 1211 Mark
The figure shows an electric circuit made up of a battery and a bulb.
Which of the following is the correct sequence of the directions of current at $X,Y$ and $Z?$ AnswerCorrect option: D. $X. ← Y. \rightarrow Z. ←$
Conventional flow of current is from the positive to the negative terminal of a battery as shown below.
View full question & answer→MCQ 1221 Mark
Filament of a bulb is made up of:
AnswerTungsten has high melting point and high resistance.
View full question & answer→MCQ 1231 Mark
There is a mistake in the given classification table:
|
Non-conductor of electricity
|
Conductor of electricity
|
|
Wool
|
Copper
|
|
Cotton
|
Brass
|
|
Plastic
|
Iron
|
|
Cork
|
Steel
|
|
Graphite
|
Silver
|
Which of the following is placed incorrectly in the groups?
AnswerGraphite is a conductor of electricity.
View full question & answer→MCQ 1241 Mark
A type of magnet in which no electricity is required for magnetic property is:
MCQ 1251 Mark
If a body is positively charged, then it has:
- ✓
Less number of electrons.
- B
- C
- D
AnswerCorrect option: A. Less number of electrons.
Positively charged means deficiency of electrons.
View full question & answer→MCQ 1261 Mark
Which one of the following device converts chemical energy into electrical energy?
MCQ 1271 Mark
Which material is the best conductor of electricity?
AnswerMetals are usually good conductor of electricity
View full question & answer→MCQ 1281 Mark
Two charges are placed at a certain distance. A metallic sheet is placed between them. What will happen to the force between the two charges?
- A
- ✓
- C
- D
Either $(a)$ or $(b).$
AnswerForce between the charges will decrease as the metallic sheet acts as an obstacle.
View full question & answer→MCQ 1291 Mark
In the given circuit which material should be placed between point X and Y to make the bulb glow?
MCQ 1301 Mark
It is a source of electricity generally used in wrist watches and transistors. It is:
MCQ 1311 Mark
It is a part of the bulb that is made up of a thin metallic wire. It is:
MCQ 1321 Mark
Why are you advised to take precautions (e.g. wear rubber gloves etc.) while handling electrical appliances?
- ✓
Your body is a good conductor of electricity.
- B
Your body is a bad conductor of electricity.
- C
You appear an electrical engineer when you wear gloves.
- D
AnswerCorrect option: A. Your body is a good conductor of electricity.
Your body is a good conductor of electricity.
View full question & answer→MCQ 1331 Mark
DIRECTIONS: Read the passage $(s)$ given below and answer the questions that follow. Passage $- 2$ An electric bulb has a filament that is connected to the terminals. The two terminals of filament are fixed with two thick wires provides support to it. These terminals are fixed in such a manner that they do not touch each other. Which of the following statement$(s)$ is/are correct?
- ✓
The two terminals of a bulb are fixed in such a way that they do not touch each other.
- B
The two terminals of a bulb are fixed in such a way that they touch each other.
- C
The two terminals of a bulb are connected to the same terminal of the electric cell.
- D
None of the above is correct.
AnswerCorrect option: A. The two terminals of a bulb are fixed in such a way that they do not touch each other.
The two terminals of a bulb are fixed in such a way that they do not touch each other.
View full question & answer→MCQ 1341 Mark
Given diagram is a torch containing cells. The torch is not glowing when the switch is $ON.$ Now, it is opened to know the reasons. Which of the following statements are correct regarding the reasons?
- Bulb of the torch is fused.
- Cells are not connected properly.
- The metal parts of the torch do not make proper contact with the cell.
AnswerCorrect option: D. All $(i), (ii)$ and $(iii).$
The torch is not glowing because either its bulb is fused or cells are connected wrongly or metal spring of torch does not make proper contact with the cell.
View full question & answer→MCQ 1351 Mark
Which of the following is correct?
- A
The air gap surrounding an electric circuit never acts as insulator.
- B
Our body is not a good conductor of electricity.
- ✓
In a cell there are always two terminals.
- D
All the above are correct.
AnswerCorrect option: C. In a cell there are always two terminals.
In a cell there are always two terminals.
View full question & answer→MCQ 1361 Mark
Most of the electricity carrying wires along the roads do not have a plastic covering like the wires used at homes. But why is there no substantial loss of energy?
- A
Air is not affected by gravity.
- ✓
Air is a bad conductor of electricity.
- C
Electricity flows very fast near highways.
- D
Current rating is high near highways.
AnswerCorrect option: B. Air is a bad conductor of electricity.
Air is a bad conductor of electricity. Hence, there is no substantial loss of energy during the flow of electricity in the overhead electric wires along the road.
View full question & answer→MCQ 1371 Mark
Look at the given figure. It consists of a cell, a bulb with the two terminals $X$ and $Y$ and wires with ends $P$ and $0;$ and $S$ and $R.$ The direction of current will be:
- ✓
$PQRS.$
- B
$SRQP.$
- C
$PRQS.$
- D
$SQRP.$
AnswerCorrect option: A. $PQRS.$
The direction of current will be $PQRS$ because the current flows from positive terminal of the cell to the negative terminal.
View full question & answer→MCQ 1381 Mark
Fuse is the most important safety device, used for protecting the circuits due to:
- ✓
Short circuiting and overloading.
- B
Overloading and earthing.
- C
- D
Short circuiting, overloading and earthing.
AnswerCorrect option: A. Short circuiting and overloading.
Short circuiting and overloading.
View full question & answer→MCQ 1391 Mark
South Pole of a freely suspended magnet is attracted towards ___________ direction of earth.
MCQ 1401 Mark
- ✓
Negatively charged particles.
- B
Positively charged particles.
- C
- D
AnswerCorrect option: A. Negatively charged particles.
Electrons are negatively charged particles$: (e = 1.6 \times 10^{-19}C).$
View full question & answer→MCQ 1411 Mark
Which one of the following substances allows the electricity to pass through it?
MCQ 1421 Mark
DIRECTIONS: Read the passage $(s)$ given below and answer the questions that follow. Passage $-1$ Those materials which do not allows electric current to pass through them are called insulators e.g., air, cork, rubber, thermocole, paper, etc. Insulators are used for covering electrical wires, plug tops, switches and other parts of electrical appliances. House wiring electric wires are generally covered with rubber. It is because, rubber is:
View full question & answer→MCQ 1431 Mark
Select the correct statement:
- A
Electrical sockets are made up of conductors, while plug tops are made up of insulators.
- B
Electrical sockets are made up of insulators, while plug tops are made up of conductors.
- ✓
Wire coverings are made up of conductors, while fuse wires are made up of insulators.
- D
Fuse wires are made up of conductors, while bulb filament is made up of insulators.
AnswerCorrect option: C. Wire coverings are made up of conductors, while fuse wires are made up of insulators.
Wire coverings are made up of conductors, while fuse wires are made up of insulators.
View full question & answer→MCQ 1441 Mark
What does the substance called which does not conduct electricity?
MCQ 1451 Mark
Choose the incorrect statement.
- A
A switch is the source of electric current in a circuit.
- ✓
A switch help to complete or break the circuit.
- C
A switch helps us to use electricity as per our requirement.
- D
When the switch is open there is an air gap between its terminals.
AnswerCorrect option: B. A switch help to complete or break the circuit.
A switch cannot be a source of electric current in the circuit. Electric cell is a source of electricity in the circuit. Other options are the functions of a switch.
View full question & answer→MCQ 1461 Mark
North pole and south pole are:
MCQ 1471 Mark
Why does a faced bulb not glow when put in an electric circuit?
- A
The electric circuit remains incomplete.
- B
There occurs a break in the path of current.
- ✓
- D
View full question & answer→MCQ 1481 Mark
Metal that can be used to make a connecting wire is:
AnswerConnecting wire is made up of conductor of electricity. Generally metals are good conductor of electricity.
View full question & answer→MCQ 1491 Mark
Why is a switch used in a circuit?
- A
- ✓
To complete or break a circuit.
- C
To prevent electric shocks.
- D
To make the bulb glow easily.
AnswerCorrect option: B. To complete or break a circuit.
A switch is used to complete or break a circuit.
View full question & answer→MCQ 1501 Mark
Choose the correct sequence for the given figure.
- A
$P-$Metal tip, $Q-$Metal case, $R-$Filament, $S-$Thick wire.
- B
$P-$Thick wire, $Q-$Metal tip, $R-$Filament, $S-$Metal case.
- ✓
$P-$Filament, $Q-$Thick wire, $R-$Metal case, $S-$Metal tip.
- D
$P-$Metal case, $Q-$Filament, $ R-$Thick wire, $S-$Metal tip.
AnswerCorrect option: C. $P-$Filament, $Q-$Thick wire, $R-$Metal case, $S-$Metal tip.
$P-$Filament, $Q-$Thick wire, $R-$Metal case, $S-$Metal tip.
View full question & answer→MCQ 1511 Mark
In __________, magnetic ore was first discovered.
MCQ 1521 Mark
How many terminals are there in a dry cell?
Answer Dry cell has two terminals $(+ve)$ and $(-ve).$
View full question & answer→MCQ 1531 Mark
Look at the circuit given below.
It consists of a cell, a bulb with two terminals $X, Y$ and wires. $P, Q, R$ and S are positions marked. What is the direction of the flow of current? - ✓
$PQRS.$
- B
$PSRQ.$
- C
$PRQS.$
- D
$SQRP.$
AnswerCorrect option: A. $PQRS.$
In an electric circuit/ the direction of flow of current is from the positive terminal to the negative terminal of the cell $PQRS.$
View full question & answer→MCQ 1541 Mark
Direction: Observe the given figure and answer the following question.
The bulb will glow when a _________ is placed in between the probes.
AnswerKey is a metallic object. When it is placed in between probes then current can easily flow in the circuit.
View full question & answer→MCQ 1551 Mark
DIRECTIONS: Read the passage $(s)$ given below and answer the questions that follow. Passage $- 3$ An arrangement in which two terminals of an electric cell are connected to two terminals of the bulb is known as electric circuit. Current flows from positive to negative terminal in closed circuit. Filament of bulb is made up of tungsten. What is the direction of flow in an electric circuit?
- ✓
From positive terminal to negative terminal of electric cell.
- B
From negative terminal to positive terminal of electric cell.
- C
Both the above are correct.
- D
None of the above is correct.
AnswerCorrect option: A. From positive terminal to negative terminal of electric cell.
From positive terminal to negative terminal of electric cell.
View full question & answer→MCQ 1561 Mark
First electro chemical cell was designed by:
MCQ 1571 Mark
In which of the following circuits will the bulb glow?
Answer
In figure $(a),$ both ends of the bulb are connected to the negative terminal of the cell. So, bulb will not glow while in figure $(b)$ and $(c),$ insulating objects like string and rubber band are used. So, the circuit is incomplete and bulb will not glow. Figure $(d)$ represents the complete circuit with proper connection. Hence, the bulb glows in figure $(d).$ View full question & answer→MCQ 1581 Mark
A substance which allows electricity to pass through it is called:
MCQ 1591 Mark
Choose the insulator from the following.
MCQ 1601 Mark
DIRECTIONS: Read the passage $(s)$ given below and answer the questions that follow. Passage $- 3$ An arrangement in which two terminals of an electric cell are connected to two terminals of the bulb is known as electric circuit. Current flows from positive to negative terminal in closed circuit. Filament of bulb is made up of tungsten. Which of the following statements) is/are correct?
- A
The bulb in the circuit may not glow if the bulb is fused.
- B
The bulb in the circuit may not glow if its filament is broken.
- ✓
- D
View full question & answer→MCQ 1611 Mark
An electric cell has _________ terminals.
MCQ 1621 Mark
Which part of the electric bulb gives off light, when the bulb is switched on?
MCQ 1631 Mark
- ✓
Converts chemical energy into electrical energy.
- B
Electrical energy into light energy.
- C
Electrical energy into magnetic energy.
- D
AnswerCorrect option: A. Converts chemical energy into electrical energy.
In a cell, chemicals are used to produce potential difference.
View full question & answer→MCQ 1641 Mark
If a body is charged by rubbing, its weight:
- A
Remains precisely constant.
- B
- C
- ✓
May increase slightly or may decrease slightly.
AnswerCorrect option: D. May increase slightly or may decrease slightly.
Depends upon electrons are released or received.
View full question & answer→MCQ 1651 Mark
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion $A$" and the other labelled as "Reason $R$". You are to examine these two statements carefully and decide if the Assertion $A$ and Reason $R$ are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below.
Assertion $A:$ An electric bulb glows, only when an electric current passes through it.
Reason $(R):$ In an electric circuit the direction of current is taken from negative to positive terminal of the electric cell.
- A
Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
- B
Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
- ✓
$A$ is true but $R$ is false.
- D
$A$ is false but $R$ is true.
AnswerCorrect option: C. $A$ is true but $R$ is false.
Assertion $A$ is true, Reason $R$ is false.
View full question & answer→MCQ 1661 Mark
Why doesn't a bulb glow even if the correct connections are made?
- Battery is dead.
- Filament is broken.
- Switch is closed.
- A
Only $(i).$
- B
Only $(ii).$
- C
Only $(iii).$
- ✓
Only $(i)$ and $(ii).$
AnswerCorrect option: D. Only $(i)$ and $(ii).$
If a battery is dead, the bulb does not get the supply of energy. So, the bulb does not glow. If the filament is broken in the bulb, it does not glow. But if a switch is closed, then the bulb glows as current flows through the circuit.
View full question & answer→MCQ 1671 Mark
Look at the following diagram and tell whether the switch in it is:
AnswerIt is representation of a closed switch.
View full question & answer→MCQ 1681 Mark
DIRECTIONS: Read the following two statements carefully and choose the correct options.
Statement$-1:$ Filament is a part of electric bulb.
Statement$-2:$ Filament consist of a thick metallic wire.
AnswerCorrect option: A. Statement $(1)$ is correct while statement $(2)$ is incorrect.
Statement $(1)$ is correct while statement $(2)$ is incorrect.
View full question & answer→MCQ 1691 Mark
Study the classification carefully and select the correct option for $X, Y$ and $Z.$
- A
$X.$ Refrigerator $Y. $ Clock $Z.$ Microwave.
- B
$X. $ Music system $Y.$ Washing machine $Z.$ Heater.
- ✓
$X.$ Walkman $Y.$ Table lamp $Z.$ Electric kettle.
- D
$X.$ Air conditioner $Y.$ Heater $Z.$ Hair drier.
AnswerCorrect option: C. $X.$ Walkman $Y.$ Table lamp $Z.$ Electric kettle.
In $X,$ the electrical energy is converted into sound energy. In $Y,$ the electrical energy is converted into light energy. In $Z,$ the electrical energy gets converted into heat energy.
View full question & answer→MCQ 1701 Mark
An example of a conductor is:
AnswerTap water, salt solution and metal wire are the examples of conductors.
View full question & answer→MCQ 1711 Mark
A student attached two balloons to equal lengths of string and tied them to the same point. The student observed that the balloons repelled each other, as shown in the diagram below.
In terms of electrical charges, explain why the balloons repelled each other?
- A
Because both the balloons are positively charged.
- B
Because both the balloon are negatively charged.
- C
Because one is positively and another is negatively charged.
- ✓
Either $(a)$ or $(b).$
AnswerCorrect option: D. Either $(a)$ or $(b).$
Like charges repel one another.
View full question & answer→MCQ 1721 Mark
Label the dry cell in the correct order.
- A
$(i)$ Carbon and Manganese dioxide mixture, $(ii)$ Carbon rod, $(iii)$ Ammonium chloride.
- B
$(i)$ Carbon rod, $(ii)$ Ammonium chloride, $(iii)$ Zinc container.
- ✓
$(i)$ Ammonium chloride, $(ii)$ Zinc container, $(iii)$ Carbon rod.
- D
$(i)$ Zinc container, $(ii)$ Carbon rod, $(iii)$ Carbon and Manganese dioxide mixture.
AnswerCorrect option: C. $(i)$ Ammonium chloride, $(ii)$ Zinc container, $(iii)$ Carbon rod.
$(i)$ Ammonium chloride, $(ii)$ Zinc container, $(iii)$ Carbon rod.
View full question & answer→MCQ 1731 Mark
Which of the following cannot be used in electrical wires?
AnswerAll the given metals are good conductors of electricity. But, iron cannot be used in electrical wires because it is brittle and corrodes when it comes in contact with the oxygen in the air.
View full question & answer→MCQ 1741 Mark
Which of the following symbols is not related to an electric circuit?
MCQ 1751 Mark
Identify the symbols of electrical components used in the construction of the given electric circuit.
- A
$X.$ Switch $Y.$ Cell $Z.$ Bulb.
- B
$X.$ Battery $Y.$ Cell $Z.$ Bulb.
- ✓
$X.$ Battery $Y.$ Switch $Z.$ Bulb.
- D
$X.$ Switch $Y.$ Cell $Z.$ Battery.
AnswerCorrect option: C. $X.$ Battery $Y.$ Switch $Z.$ Bulb.
The symbols of electrical components used in the construction of the given circuit are $X -$ Battery, $Y -$ Switch, $Z -$ Bulb.
View full question & answer→MCQ 1761 Mark
Which of the following statements are correct?
- Human body is a good conductor of electricity.
- The air gap surrounding an electric circuit acts as a conductor.
- Silver conducts electricity better than any other metal.
- When electricity lights up a bulb, no heat is produced.
- A
$(i)$ and $(ii).$
- B
$(iii)$ and $(iv).$
- ✓
$(i)$ and $(iii).$
- D
$(ii)$ and $(iii).$
AnswerCorrect option: C. $(i)$ and $(iii).$
Air is a bad conductor of electricity. When electricity lights up a bulb, heat is produced.
View full question & answer→MCQ 1771 Mark
In an electric circuit a switch is provided. The main function of switch is to:
- A
Make the bulb glow easily.
- B
Avoid the electric shocks.
- C
Allow the easy flow of charges in the circuit.
- ✓
Make or break the circuit.
AnswerCorrect option: D. Make or break the circuit.
Make or break the circuit.
View full question & answer→MCQ 1781 Mark
Which part of the electric cell generally acts as positive terminal of the cell?
- A
- ✓
- C
Either metal disc or metal cap.
- D
All the above are correct.
View full question & answer→MCQ 1791 Mark
Filament of an electric bulb refers to:
MCQ 1801 Mark
Why do electricians wear gloves made of rubber?
AnswerGloves used by electricians are made of rubber which is an insulator.
View full question & answer→MCQ 1811 Mark
Look at the figure shown below.
Why is sealing wax filled in the space between the terminals of a bulb?
- A
To prevent the escape of air inside the bulb.
- ✓
To prevent the contact between the two terminals.
- C
To have a better contact of terminals with one another.
- D
To give support to the supporting wires holding the filament.
AnswerCorrect option: B. To prevent the contact between the two terminals.
The reason for filling the space between the terminals of the bulb with sealing wax is to prevent the contact between the two terminals.
View full question & answer→MCQ 1821 Mark
Ravi connected three bulbs with the cells and a switch as shown. When switch is moved to $ON$ position.
- A
The bulb $X$ will glow first.
- B
The bulb $Y$ will glow first.
- C
The bulbs $Z$ and $X$ will glow first.
- ✓
All the bulbs will glow simultaneously.
AnswerCorrect option: D. All the bulbs will glow simultaneously.
Current will flow positive to negative terminal, so all bulbs will glow simultaneously.
View full question & answer→MCQ 1831 Mark
A cell is generally provided with a cap. The main function performed by this cap is:
- A
It seals the contents of the cell.
- B
It keeps various parts of cell in their place.
- C
It acts as negative terminal of the cell.
- ✓
AnswerIt acts as a positive terminal of the cell.
View full question & answer→MCQ 1841 Mark
Strips of magnetite which was used to find directions to lead the way for ships:
MCQ 1851 Mark
Which of the following is the best insulator?
MCQ 1861 Mark
Inside a cell current flows from:
- A
Positive terminal to negative terminal.
- ✓
Negative terminal to positive terminal.
- C
Positive terminal to positive terminal.
- D
Either $(a)$ or $(b).$
AnswerCorrect option: B. Negative terminal to positive terminal.
In a closed electric circuit inside a cell current always flows from negative to positive terminal.
View full question & answer→MCQ 1871 Mark
- ✓
A good conductor of electricity.
- B
A non-conductor of electricity.
- C
A very poor conductor of electricity.
- D
AnswerCorrect option: A. A good conductor of electricity.
Human body is a good conductor of electricity.
View full question & answer→MCQ 1881 Mark
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage An electric cell is a source of electricity. Such cells are used in alarm clocks, wrist watches, transistor radios, cameras, etc. An electric cell is used:
- ✓
As a source of electrical energy.
- B
As a source of muscular energy.
- C
- D
AnswerCorrect option: A. As a source of electrical energy.
A cell is used as a source of electrical energy.
View full question & answer→MCQ 1891 Mark
There is a force of attraction between:
- A
- ✓
- C
Both $(a)$ and $(b).$
- D
AnswerOpposite charges attract each other and like charges repel each other.
View full question & answer→MCQ 1901 Mark
If we add another bulb to an electric circuit that is provided with a glowing bulbs, then:
- A
The new bulb will glow but the first one will not glow.
- B
None of the two bulb will glow.
- ✓
Both the bulbs will glow but less brightly.
- D
Both the bulbs will glow but more brightly.
AnswerCorrect option: C. Both the bulbs will glow but less brightly.
Both the bulbs will glow but less brightly.
View full question & answer→MCQ 1911 Mark
Which of the following materials is attracted by a magnet?
MCQ 1921 Mark
- A
Is a part of the electric bulb.
- B
- C
Fixed in the middle of the bulb.
- ✓
The thin wire that gives off light when bulb is switched on.
AnswerCorrect option: D. The thin wire that gives off light when bulb is switched on.
The thin wire that gives off light when bulb is switched on.
View full question & answer→MCQ 1931 Mark
How many filaments are there in a bulb?
MCQ 1941 Mark
DIRECTIONS: Read the passage $(s)$ given below and answer the questions that follow. Passage $-1$ Those materials which do not allows electric current to pass through them are called insulators e.g., air, cork, rubber, thermocole, paper, etc. Insulators are used for covering electrical wires, plug tops, switches and other parts of electrical appliances. We can turn $OFF$ the switch without getting an electric shock because:
- ✓
It is covered with an insulating material.
- B
It is covered with conducting material.
- C
Our hand is bad conductor of electricity.
- D
AnswerCorrect option: A. It is covered with an insulating material.
It is covered with an insulating material.
View full question & answer→MCQ 1951 Mark
When we switched $OFF$ an electric circuit, the circuit becomes:
AnswerWhen we switched $OFF$ an electric circuit, the circuit becomes open and there is no current flows in the circuit.
View full question & answer→MCQ 1961 Mark
Which one of the following device converts electrical energy into light energy?
MCQ 1971 Mark
A person working as line man with electricity department is advised not to handle electric wires with bare hands and always bear rubber gloves while working with electric wires. This advice is given because:
- A
He will get electrocuted if he handles live electric wires with bare hands.
- B
The rubber gloves being insulators will protect him from electric shocks.
- C
The rubber gloves control the electric flow.
- ✓
Both $(a)$ and $(b).$
AnswerCorrect option: D. Both $(a)$ and $(b).$
Both $(a)$ and $(b).$
View full question & answer→MCQ 1981 Mark
The above figure consists a:
- A
A battery of two cells, a switch, a bulb.
- B
A single cell, a bulb, a switch.
- ✓
A battery of three cells, a bulb, a switch.
- D
A single cell, a bulb, a switch.
AnswerCorrect option: C. A battery of three cells, a bulb, a switch.
A battery of three cells, a bulb, a switch.
View full question & answer→MCQ 1991 Mark
AnswerCorrect option: B. A combination of cells in which cells are joined $(+) $ to $(-).$
In a battery two or more cells are combined in such a way that $(+)$ terminal of one cell is joined to $(-)$ terminal of other.
View full question & answer→MCQ 2001 Mark
To close or open the electric circuit we use:
MCQ 2011 Mark
Nidhi has two bulbs connected across two cells in a simple circuit as shown. How can she make the bulbs glow dimmer?
- A
Replace one cell with a piece of chalk.
- ✓
Replace one cell with a piece of wire.
- C
Replace one bulb with a piece of wire.
- D
Replace one bulb with another cell.
AnswerCorrect option: B. Replace one cell with a piece of wire.
Replacing one cell with a piece of wire reduces the current in the circuit. Hence, the bulbs glow dimmer.
View full question & answer→MCQ 2021 Mark
Regions of strongest magnetic attraction on a magnet are:
- A
- B
- C
- ✓
Both $(b)$ and $(c).$
AnswerCorrect option: D. Both $(b)$ and $(c).$
Both $(b)$ and $(c).$
View full question & answer→MCQ 2031 Mark
An electric cell is used as a source of electricity in:
MCQ 2041 Mark
Three identical bulbs namely $P, Q$ and $R$ are connected to a battery as shown. What will happen when the circuit is closed?
- A
$R$ will glow bright but $Q$ and $P$ will be dim.
- B
$P, Q$ and $R$ all will glow equally bright.
- C
$Q$ and $R$ will immediately burnout.
- ✓
$P$ will glow bright, but $Q$ and $R$ will be dim.
AnswerCorrect option: D. $P$ will glow bright, but $Q$ and $R$ will be dim.
When the circuit is closed, an electric current starts flowing in the circuit from the positive terminal of battery. The current which passes through bulb $P$ gets divided and flows in bulbs $Q$ and $R.$ As the brightness depends upon the current flowing through the bulb, so $P$ will be bright but $Q$ and $R$ will be dim.
View full question & answer→MCQ 2051 Mark
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion $A$" and the other labelled as "Reason $R$". You are to examine these two statements carefully and decide if the Assertion $A$ and Reason $R$ are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion $A:$ An electric bulb has two terminals. Reason $(R):$ The two terminals of an electric bulb are fixed in such a way that they do not touch each other.
- A
Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
- ✓
Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
- C
$A$ is true but $R$ is false.
- D
$A$ is false but $R$ is true.
AnswerCorrect option: B. Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
View full question & answer→MCQ 2061 Mark
Why is copper not used as a filament?
- A
- B
It has a high melting point.
- ✓
It is a good conductor of current.
- D
AnswerCorrect option: C. It is a good conductor of current.
Copper cannot be used as a filament because it is a good conductor of current.
View full question & answer→MCQ 2071 Mark
Metals conduct charges better than wood because metals have more:
AnswerFree electrons are required to conduct charges. Only electron not protons or neutrons can be transferred from one body to another body.
View full question & answer→MCQ 2081 Mark
A complete electric circuit is called a/ an ________ electric circuit.
AnswerAn electric circuit is said to be complete when electric current flowing through all the components of the circuit without interruption.
View full question & answer→MCQ 2091 Mark
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage An electric cell is a source of electricity. Such cells are used in alarm clocks, wrist watches, transistor radios, cameras, etc. The electric cell has:
- A
- B
- ✓
- D
None of the above is correct.
AnswerThere are two terminals of a cell.
View full question & answer→MCQ 2101 Mark
Which is the only natural magnet?
MCQ 2111 Mark
Which of the following does NOT belong to the group formed by the others?
AnswerIron, tin and steel are all metals and good conductors of heat and electricity. Glass is a bad conductor of heat and electricity.
View full question & answer→MCQ 2121 Mark
- ✓
- B
- C
- D
Open circuit if bulb is not fused.
AnswerOnly a closed circuit is a complete circuit.
View full question & answer→MCQ 2131 Mark
Fill in the blanks with a correct combination of words. $(i)$ were discovered by an old $(ii)$ named $(iii)$ He had a $(iv)$ stick. The stick had an iron casing at its lower end which was attracted by a rock. This rock which behaved like a magnet was given the name $(v).$
- A
$(i)-$Magnetite, $(ii)-$Cobbler, $(iii)-$Magnet, $(iv)-$Plastic, $(v)-$Magnes.
- B
$(i)-$Magnes, $(ii)-$Painter, $(iii)-$Magnet, $(iv)-$Rubber, $(v)-$Magnetite.
- ✓
$(i)-$Magnets, $(ii)-$Shepherded, $(iii)-$Magnes, $(iv)-$Wooden,$ (v)-$Magnetite.
- D
$(i)-$Magnets, $(ii)-$Cobbler, $(iii)-$Magnes, $(iv)-$Wooden, $(v)-$Magnetite.
AnswerCorrect option: C. $(i)-$Magnets, $(ii)-$Shepherded, $(iii)-$Magnes, $(iv)-$Wooden,$ (v)-$Magnetite.
$(i)-$Magnets, $(ii)-$Shepherded, $(iii)-$Magnes, $(iv)-$Wooden, $(v)-$Magnetite.
View full question & answer→MCQ 2141 Mark
A cell, a conducting wire and a bulb are used for constructing a simple electric circuit. What are they called?
AnswerA cell, a conducting wire, and a bulb are called the components of an electric circuit.
View full question & answer→MCQ 2151 Mark
In the given diagram, there are two switches $S_1$ and $S_2$ and two bulbs $X$ and $Y.$ If switch $S_1,$ is closed and switch $S_2$ is open then:
AnswerCorrect option: B. Only bulb $Y$ will glow.
Since switch $S_2$ is open and $S_1$ is closed, the current will pass through $Y$ but for bulb $X,$ the circuit is incomplete. There is no complete path for current to flow for bulb $X.$ Hence, only bulb $Y$ will glow.
View full question & answer→MCQ 2161 Mark
__________ is a piece of iron placed across the poles of a magnet to preserve the strength of the magnet.
MCQ 2171 Mark
Which one of the following is the correct grouping of different materials according to their electrical conductivity?
- ✓
|
Electrical Insulators
|
Electrical Conductors
|
|
Plastic/ wood
|
Mercury, tungsten
|
- B
|
Electrical Insulators
|
Electrical Conductors
|
|
Carbon, steel
|
Iron, paper
|
- C
|
Electrical Insulators
|
Electrical Conductors
|
|
Copper, gold
|
Nickel, clay
|
- D
|
Electrical Insulators
|
Electrical Conductors
|
|
Iron, rubber
|
Silver, plastic
|
AnswerCorrect option: A.
|
Electrical Insulators
|
Electrical Conductors
|
|
Plastic/ wood
|
Mercury, tungsten
|
|
Electrical Insulators
|
Electrical Conductors
|
|
Plastic/ wood
|
Mercury, tungsten
|
Electrical insulators are plastic, wood, paper, clay, rubber, etc. Electrical conductors are metals like mercury, tungsten, steel, nickel, carbon, copper and gold.
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