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Physics [1 Mark Question Answer]

Current Electricity · ICSE STD 10 (ICSE - English Medium). 28 questions.

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[1 Mark Question Answer]

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28 questions · timed · auto-graded

Question 11 Mark
What is consumed while using different electrical appliances, for which electricity bills are paid?
Answer
Electrical energy in kWh which is commercially called a unit of electrical energy.
1 kWh = 1 kW × 1 hr = 1 unit of electricity.
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Question 21 Mark
What is the voltage of the electricity that is generally supplied to a house?
Answer
The voltage of the electricity that is generally supplied to a house is 220 Volt
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Question 41 Mark
Explain the meaning of the statement 'the power of an appliance is 100 W'.
Answer
The power of an appliance is 100 W. It means that 100 J of electrical energy is consumed by the appliance in 1 second.
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Question 51 Mark
Write an expression for the electrical power spent in flow of current through a conductor in terms of current and resistance.
Answer
Electrical Power ,$ P = I^2R$
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Question 61 Mark
Write an expression for the electrical power spent in flow of current through a conductor in terms of resistance and potential difference.
Answer
Electrical Power, $P=\frac{V^2}{R}$
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Question 71 Mark
Write an expression for the electrical energy spent in flow of current through an electrical appliance in terms of current, resistance and time.
Answer
Electrical energy , $W = I^2 R t$ joule
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Question 91 Mark
Complete the following:
$
1 kWh =\frac{1 \text { volt } \times \text { lampere } \times}{1000}
$
Answer
$1 kWh =\frac{1 \text { volt } \times 1 \text { ampere } \times 1 \text { hour }}{1000}$
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Question 101 Mark
How do kilowatt and kilowatt-hour differ ?
Answer
Kilowatt is the unit of electrical power whereas kilowatt-hour is the unit of electrical energy.
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Question 111 Mark
State how are the two resistors joined with a battery in each of the following cases when:

equivalent resistance is more than either of the two resistances.

Answer
series
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Question 121 Mark
State how are the two resistors joined with a battery in each of the following cases when:

equivalent resistance is less than either of the two resistances

Answer
parallel
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Question 131 Mark
State how are the two resistors joined with a battery in each of the following cases when:

potential difference is same across each resistor

Answer
parallel
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Question 141 Mark
State how are the two resistors joined with a battery in each of the following cases when:

same current flows in each resistor

Answer
series
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Question 151 Mark
Name the particles which are responsible for the flow of current in a metallic wire.
Answer
Particles responsible for the flow of current in a metallic wire are free electrons.
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Question 161 Mark
State whether the current is a scalar or vector? What does the direction of current convey?
Answer
Current is a scalar quantity. The direction of current conveys that the flow of electrons is opposite to the direction of flow of current.
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Question 171 Mark
Explain the statement ‘the potential difference between two points is 1 volt’.
Answer
One volt is the potential difference between two points in an electric circuit when 1 joule of work is done to move charge of 1 coulomb from one point to other.
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Question 191 Mark
What is a superconductor? Give one example of it.
Answer
A superconductor is a substance of zero resistance at a very low temperature. Example: Mercury at 4.2 K.
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Question 201 Mark
Name the material used for filament of an electric bulb .
Answer
A wire made of tungsten is used for filament of electric bulb because it has a high melting
point and high resistivity.
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Question 211 Mark
Name the material used for making a fuse wire. Give a reason.
Answer
Generally fuse wire is made of an alloy of lead and tin because its resistivity is high and melting
point is low.
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Question 221 Mark
How does (a) resistance, and (b) specific resistance of a wire depend on its (i) length, and (ii) radius?
Answer
Resistance is directly proportional to the length and inversely proportional to the square of radius. Specific resistance is independent on the dimensions of a wire.
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Question 231 Mark
How does specific resistance of a semi-conductor change with the increase in temperature?
Answer
Specific resistance of a semiconductor decreases with increase in temperature.
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Question 241 Mark
Name a substance of which the resistance remains almost unchanged by the increase in temperature.
Answer
Manganin
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Question 251 Mark
Two wires A and B are made of copper. The wire A is long and thin while the wire B is Short and thick. Which will have more specific resistance ?
Answer
Specific resistance depends on the material of the wire and not its dimensions. Hence, both the wires will have the same specific resistance .
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Question 261 Mark
Name two factors on which the specific resistance of a wire depends?
Answer
The specific resistance of a wire depends on the material of the substance and the temperature of the substance.
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Question 271 Mark
State the order of resistivity of (i) a metal, (ii) a semiconductor and (iii) an insulator.
Answer
Metal < Semiconductor < Insulator
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Question 281 Mark
Two wires one of copper and other of iron, are of the same length and same radius. Which will have more resistance? Give reason.
Answer
Iron wire will have more resistance than copper wire of the same length and same radius because resistivity of iron is more than that of copper.
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[1 Mark Question Answer] - Physics STD 10 Questions - Vidyadip