The unit for expressing electric power is:
- AVolt.
- BJoule.
- CCoulomb.
- ✓Watt.
Answer: D.
View full solution →Question types
Electricity question types
656 questions across 12 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
656
Questions
12
Question groups
5
Question types
01
M.C.Q
56 Q→02Fill in the blank
6 Q→03[1 Mark Questions]
103 Q→04[2 Mark Questions]
76 Q→05[3 Mark Questions]
62 Q→06[5 marks Questions]
25 Q→07M.C.Q-[Phy-1M]
56 Q→08Fill in the blank [Phy-1M]
6 Q→09Answer the questions.[Phy-1M]
103 Q→10Answer the questions.[Phy-2M]
76 Q→11Answer the questions.[Phy-3M]
62 Q→12Answer the questions.[Phy-5M]
25 Q→Sample Questions
Electricity questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
When a $4 Ω$ resistor is connected across the terminals of a 12V battery, the number of coulombs passing through the resistor per second is:
- A0.3
- ✓3
- C4
- D12
Answer: B.
View full solution →In the circuit shown below:
The potential difference across the $3 Ω$ resistor is:
The potential difference across the $3 Ω$ resistor is:
- A$\frac{1}{9}\text{V}$
- B$\frac{1}{2}\text{V}$
- ✓1V
- D2V
Answer: C.
View full solution →The current passing through an electric kettle has been doubled. The heat produced will become:
- AHalf.
- BDouble.
- CFour time.
- ✓One-fourth.
Answer: D.
View full solution →A battery and three lamps are connected as shown? Which of the following statements about the currents at X, Y and Z is correct?
- AThe current at Z is greater than that at Y.
- ✓The current at Y is greater than that at Z.
- CThe current at X equals the current at Y.
- DThe current at X equals the current at Z.
Answer: B.
View full solution →Fill in the following blanks with suitable words:
Copper is a good _______ Plastic is an _______.
Copper is a good _______ Plastic is an _______.
Fill in the following blanks with suitable words:
Current is measured in __________ using an __________ placed in __________ in a circuit.
Current is measured in __________ using an __________ placed in __________ in a circuit.
Fill in the following blanks with suitable words:
Potential difference is measured in __________ by using a __________ placed in __________ across a component.
Potential difference is measured in __________ by using a __________ placed in __________ across a component.
Fill in the following blanks with suitable words:
A current is a flow of _________ For this to happen there must be a _________.
A current is a flow of _________ For this to happen there must be a _________.
Fill in the following blank with a suitable word:
Ohm’s law states a relation between potential difference and ________.
Ohm’s law states a relation between potential difference and ________.
Why should the resistance of:
A voltmeter be very large?
A voltmeter be very large?
What happens to the resistance as the conductor is made thinner?
A resistance of 20 ohms has a current of 2 amperes flowing in it. What potential difference is there between its ends?
An electric bulb is rated at 220V, 100W. What is its resistance?
An electric lamp is labelled 12V, 36W. This indicates that it should be used with a 12V supply. What other information does the label provide?
If five resistances, each of value 0.2 ohm, are connected in series, what will be the resultant resistance?
An electric room heater draws a current of 2.4A from the 120V supply line. What current will this room heater draw when connected to 240V supply line?
An electric bulb is connected to a 220V power supply line. If the bulb draws a current of 0.5A, calculate the power of the bulb.
What is meant by the heating effect of current? Give two applications of the heating effect of current.
A heating coil has a resistance of 200Ω. At what rate will heat be produced in it when a current of 2.5A flows through it?
State three factors on which the heat produced by an electric current depends. How does it depend on these factors?
Consider the circuit given below where A, B and C are three identical light bulbs of constant resistance.
- List the bulbs in order of increasing brightness.
- If C burns out, what will be the brightness of A now compared with before?
- If B burns out instead, what will be the brightness of A and C compared with before?
The electrical resistivities of four materials P, Q, R and S are given below:
$\begin{matrix}\text{P}&6.84\times10^{-8}\Omega\text{m}\\\text{Q}&1.70\times10^{-8}\Omega\text{m}\\\text{R}&1.0\times10^{15}\Omega\text{m}\\\text{S}&11.0\times10^{-7}\Omega\text{m}\end{matrix}$
Which material will you use for making:
View full solution →$\begin{matrix}\text{P}&6.84\times10^{-8}\Omega\text{m}\\\text{Q}&1.70\times10^{-8}\Omega\text{m}\\\text{R}&1.0\times10^{15}\Omega\text{m}\\\text{S}&11.0\times10^{-7}\Omega\text{m}\end{matrix}$
Which material will you use for making:
- Heating element of electric iron.
- Connecting wires of electric iron.
- Covering of connecting wires?
Calculate the resistance of a copper wire 1.0km long and 0.50mm diameter if the resistivity of copper is $1.7\times10\Omega\ \text{m}.$
View full solution →A $4 Ω$ coil and a $2 Ω$ coil are connected in parallel. What is their combined resistance? A total current of 3A passes through the coils. What current passes through the $2 Ω$ coil?
View full solution →A 5V battery is connected to two $20 Ω$ resistors which are joined together in series.
View full solution →- Draw a circuit diagram to represent this. Add an arrow to indicate the direction of conventional current flow in the circuit.
- What is the effective resistance of the two resistors?
- Calculate the current that flows from the battery.
- What is the p.d. across each resistor?
The circuit diagram given below shows the combination of three resistors $R_1 R_2$ and $R_3$ :
Find:
View full solution →Find:
- Total resistance of the circuit.
- Total current flowing in the circuit.
- The potential difference across R.
In the circuit diagram given below five resistances of $10 Ω, 40 Ω, 30 Ω, 20 Ω\ \text{and}\ 60 Ω$ are connected as shown to a 12V battery.
Calculate:
View full solution →Calculate:
- Total resistance in the circuit.
- Total current flowing in the circuit.
State whether an electric heater will consume more electrical energy or less electrical energy per second when the length of its heating element is reduced. Give reasons for your answer.
With the help of a circuit diagram, deduce the equivalent resistance of two resistances connected in series. Two resistances are connected in series as shown in the diagram:
- What is the current through the 5 ohm resistance?
- What is the current through R?
- What is the value of R?
- What is the value of V?
Which unit could be used to measure current?
- Watt.
- Coulomb.
- Volt.
- Ampere.
Which statement/statement is/ are correct?
- An ammeter is connected in series in a circuit and a voltmeter is connected in parallel.
- An ammeter has a high resistance.
- A voltmeter has a low resistance.
- 1, 2, 3
- 1, 2
- 2, 3.
- 1.
Which of the following units could be used to measure electric charge?
- Ampere.
- Joule.
- Volt.
- Coulomb.
Which of the following statements correctly defines a volt?
- A volt is a joule per ampere.
- A volt is a joule per coulomb.
Which of the following is the most likely temperature of the filament of an electric light bulb when it is working on the normal 220V supply line?
- 500°C
- 1500°C
- 2500°C
- 4500°C
Fill in the following blank with a suitable word:
Ohm’s law states a relation between potential difference and ________.
Ohm’s law states a relation between potential difference and ________.
Fill in the following blanks with suitable words:
Resistance is measured in _________ The resistance of a wire increases as the length _________ as the temperature _________ and as the cross-sectional area _________.
Resistance is measured in _________ The resistance of a wire increases as the length _________ as the temperature _________ and as the cross-sectional area _________.
Fill in the following blanks with suitable words:
Potential difference is measured in __________ by using a __________ placed in __________ across a component.
Potential difference is measured in __________ by using a __________ placed in __________ across a component.
Fill in the following blanks with suitable words:
Current is measured in __________ using an __________ placed in __________ in a circuit.
Current is measured in __________ using an __________ placed in __________ in a circuit.
Fill in the following blanks with suitable words:
Copper is a good _______ Plastic is an _______.
Copper is a good _______ Plastic is an _______.
Write down the formula which states the relation between potential difference, current and resistance.
Write down the formula which relates electric charge, time and electric current.
Write down the formula for the heat produced when a current I is passed through a resistor R for time.
Write down an expression for the resistance of a metallic wire in terms of the resistivity.
Will current flow more easily through a thick wire or a thin wire of the same material when connected to the same source? Give reason for your answer.
You are supplied with a number of $100 Ω$ How could you combine some of these resisters to make a $250 Ω$ resistor?
View full solution →Why is a series arrangement not used for connecting domestic electrical appliances in a circuit?
Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb.
Why does the connecting cord of an electric heater not glow hot while the heating element does?
Why are the coils of electric irons and electric toasters made of an alloy rather than a pure metal?
You are given one hundred $1 Ω $ resister. What is the smallest and largest resistance you can make in a circuit using these?
View full solution →With the help of a circuit diagram, obtain the relation for the equivalent resistance of two resistances connected in parallel.
In the circuit diagram shown below, find:
In the circuit diagram shown below, find:
- Total resistance.
- Current shown by the ammeter A
Which uses more energy: a 250W TV set in 1 hour or a 1200W to aster in 10 minutes?
When a current of 4.0A passes through a certain resistor for 10 minutes, 2.88 × 10J of heat are produced. Calculate:
- The power of the resistor.
- The voltage across the resistor.
What would be the effect on the resistance of a metal wire of:
- Increasing its length?
- Increasing its diameter?
- Increasing its temperature?
You are given three resistances of 1,2 and 3 ohms. Show by diagrams, how with the help of these resistances you can get:
View full solution →- $6\Omega$
- $\frac{6}{11}\Omega$
- $1.5\Omega$
With the help of a diagram, derive the formula for the resultant resistance of three resistors connected in series.
With the help of a circuit diagram, deduce the equivalent resistance of two resistances connected in series. Two resistances are connected in series as shown in the diagram:
- What is the current through the 5 ohm resistance?
- What is the current through R?
- What is the value of R?
- What is the value of V?
Two resistors, with resistances $ 5 Ω$ and $10 Ω$ respectively are to be connected to a battery of emf 6V so as to obtain:
View full solution →- Minimum current flowing.
- Maximum current flowing.
- How will you connect the resistances in each case?
- Calculate the strength of the total current in the circuit in the two cases.
Two lamps, one rated 40W at 220V and the other 60W at 220V, are connected in parallel to the electric supply at 220V.
- 10 Draw a circuit diagram to show the connections.
- Calculate the current drawn from the electric supply.
- Calculate the total energy consumed by the two lamps together when they operate for one hour.
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