# Unseen Passage

For Class 4 to Class 12

# Electricity MCQ Class 10 Science

Please refer to Chapter 15 Electricity MCQ Class 10 Science with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 10 Science. Students should refer to MCQ Questions for Class 10 Science with Answers to score more marks in Grade 10 Science exams. Students should read the chapter Electricity and then attempt the following objective questions.

## MCQ Questions Class 10 Science Chapter 15 Electricity

The Electricity MCQ Class 10 Science provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. The resistivity of insulators is of the order of
(a) 10-8 Ω-m
(b) 101 Ω-m
(c) 10-6 Ω-m
(d) 106 Ω-m

A

Question. The electrical resistance of insulators is
(a) high
(b) low
(c) zero
(d) infinitely high

D

Question. What is the commercial unit of electrical energy?
(a) Joules
(b) Kilojoules
(c) Kilowatt-hour
(d) Watt-hour

C

Question. When electric current is passed, electrons move from:
(a) high potential to low potential.
(b) low potential to high potential.
(c) in the direction of the current.
(d) against the direction of the current.

B

Question. A student says that the resistance of two wires of same length and same area of cross section is same. This statement is correct if
(a) Both wires are of different materials
(b) Both wires are made of same material and are at different temperature.
(c) Both wires are made of same material and are at same temperature.
(d) Both wires are made of different materials and are at the same temperature.

C

Question. A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is
(a) 2.5 A
(b) 5.0 A
(c) 7.5 A
(d) 10 A

D

Question. Assertion: When a battery is short circuited, the terminal voltage is zero.
Reason: In short circuit, the current is zero.
(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.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

C

Question. If the current I through a resistor is increased by 100% the increased in power dissipation will be (assume temperature remain unchanged)
(a)100%
(b) 200%
(c) 300%
(d) 400%

C

Question. Two resistors are connected in series gives an equivalent resistance of 10 Ω. When connected in parallel, gives 2.4 Ω. Then the individual resistance are
(a) each of 5 Ω
(b) 6 Ω and 4 Ω
(c) 7 Ω and 4 Ω
(d) 8 Ω and 2 Ω

B

Question. A coil in the heater consume power P on passing current. If it is cut into halves and joined in parallel, it will consume power
(a) P
(b) P/2
(c) 2P
(d) 4P

D

Question. If R 1 and R 2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then
(a) R 1 < R 2
(b) R 2 < R 1
(c) R 1  = R 2
(d) R 1 ≥ R 2

B

Question. An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be:
(a) 100 W
(b) 75 W
(c) 50 W
(d) 25 W

D

Question. The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is
(a) < 100 Ω
(b) < 4 Ω
(c) < 1 Ω
(d) > 2 Ω

C

Question. A metallic conductor has loosely bound electrons called free electrons. The metallic conductor is
(a) negatively charged
(b) positively charged
(c) neutral
(d) Either positively charged or negatively charged

C

Question. Specific resistance of a wire depends on the
(a) length of the wire
(b) area of cross-section of the wire
(c) resistance of the wire
(d) material of the wire

D

Question. The resistance of an ideal voltmeter is
(a) zero
(b) very low
(c) very large
(d) Infinite

C

Question. Masses of 3 wires of same metal are in the ratio 1 : 2 : 3 and their lengths are in the ratio 3 : 2 : 1. The electrical resistances are in ratio
(a) 1 : 4 : 9
(b) 9 : 4 : 1
(c) 1 : 2 : 3
(d) 27 : 6 : 1

D

Question. What should be the characteristic of fuse wire?
(a) High melting point, high specific resistance
(b) Low melting point, low specific resistance
(c) High melting point, low specific resistance
(d) Low melting point, high specific resistance

D

Question. When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be
(a) R/4
(b) R/8
(c) 4R
(d) R/2

A

Question. We have two wires A and B of same mass and same material. The diameter of the wire A is half of that B. If the resistance of wire A is 24 ohm then the resistance of wire B will be
(a) 12 ohm
(b) 3.0 ohm
(c) 1.5 ohm
(d) None of the above

C

Question. When the current passes through the filament, it gets heated to incandescence and give light while the connecting wires are not heated because
(a) The connecting wires are good conductor of heat while the filament is bad conductor
(b) The connecting wires are of low resistance while the filament is of high resistance
(c) The density of connecting wires is less than that of the filament
(d) The connecting wires are bad conductor of heat while the filament is good conductor

B

Question. The resistance of some substances become zero at very low temperature, then these substances are called
(a) good conductors
(b) super conductors
(d) semi conductors

B

Question. Two electric lamps each of 100 watts 220V are connected in series to a supply of 220 volts. The power consumed would be –
(a) 100 watts
(b) 200 watts
(c) 25 watts
(d) 50 watts

D

Question. A solenoid is at potential difference 60V and current flows through it is 15 ampere, then the resistance of coil will be
(a) 4 Ω
(b) 8 Ω
(c) 0.25 Ω
(d) 2 Ω

A

Question. The power dissipated in the circuit shown in the figure is 30 watts. The value of R is

(a) 20 Ω
(b) 15 Ω
(c) 10 Ω
(d) 30 Ω

C

Question. If it takes 8 minutes to boil a quantity of water electrically, how long will it take to boil the same quantity of water using the same heating coil but with the current doubled
(a) 32 minutes
(b) 16 minutes
(c) 4 minutes
(d) 2 minutes

D

Question. A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of
(a) Each of these increases
(b) Each of these decreases
(c) Copper strip increases and that of germanium decreases
(d) Copper strip decreases and that of germanium increases

D

Question. An electric bulb is filled with
(a) hydrogen
(b) oxygen and hydrogen
(c) ammonia
(d) nitrogen and argon

D

Question. When current is passed through an electric bulb, its filament glows, but the wire leading current to the bulb does not glow because
(a) less current flows in the leading wire as compared to that in the filament
(b) the leading wire has more resistance than the filament
(c) the leading wire has less resistance than the filament
(d) filament has coating of fluorescent material over it

C

Question. Which of the following terms does not represent electrical power in a circuit?
(a) I2R
(b) IR2
(c) VI
(d) V2/R

B

Question. What length of the wire of specific resistance 48 × 10–8 Ω-m is needed to make a resistance of 4.2 Ω (diameter of wire = 0.4 mm)
(a) 4.1 m
(b) 3.1 m
(c) 2.1 m
(d) 1.1 m

D

Question. The filament of an electric bulb is of tungsten because
(a) Its resistance is negligible
(b) It is cheaper
(c) Its melting point is high

C

Question. Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is
(a) current
(b) voltage
(c) resistance
(d) None of these

B

Question. 100 J of heat is produced each second in a 4Ω resistor. The potential difference across the resistor will be:
(a) 30 V
(b) 10 V
(c) 20 V
(d) 25 V

B

Question. Work done to move 1coulomb charge from one point to another point on a charged conductor having potential 10volt is
(a) 1 Joule
(b) 10 Joule
(c) zero
(d) 100 Joule

C

Question. Assertion: Bending of wire decrease the resistance of electric wire.
Reason: The resistance of a conductor depends on length, thickness, nature of material and temperature of the conductor.
(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.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

A

Question. An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?
(a) 440 W
(b) 110 W
(c) 55 W
(d) 0.0023 W

B

Question. A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it is
(a) 2 A
(b) 4 A
(c) 8 A
(d) 16 A

C

Question. The heating element of an electric iron is made up of:
(a) copper
(b) nichrome
(c) aluminium
(d) iron

B

Question. Coulomb is the SI unit of:
(a) charge
(b) current
(c) potential difference
(d) resistance

A

Question. A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of
(a) more length
(c) less length

D

Question. Assertion: In an open circuit, the current passes from one terminal of the electric cell to another.
Reason: Generally, the metal disc of a cell acts as a 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.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

D

Question. Three resistors of 1 Ω, 2 ft and 3 Ω are connected in parallel. The combined resistance of the three resistors should be
(a) greater than 3 Ω
(b) less than 1 Ω
(c) equal to 2 Ω
(d) between 1 Ω and 3 Ω

B

Question. 1 mV is equal to:
(a) 10 volt
(b) 1000 volt
(c) 10-3 volt
(d) 10-6 volt

C

Question. Electric potential is a:
(a) scalar quantity
(b) vector quantity
(c) neither scalar nor vector
(d) sometimes scalar and sometimes vector

A

Question. To get 2 Ω resistance using only 6 Ω resistors, the number of them required is
(a) 2
(b) 3
(c) 4
(d) 6

B

Question. Resistivity of a metallic wise depends on
(a) its length
(b) its shape
(c) its thickness
(d) nature of material

D

Question. What is the maximum resistance which can be made using five resistors each of 1/5 W?
(a) 1/5 Ω
(b) 10 Ω
(c) 5 Ω
(d) 1 Ω

D

Question. Which of the following gases are filled in electric bulbs?
(a) Helium and Neon
(b) Neon and Argon
(c) Argon and Hydrogen
(d) Argon and Nitrogen

D

Question. A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly
(a) 1020
(b) 1016
(c) 1018
(d) 1023

A

Question. A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio R/R’ is:
(a) 1/25
(b) 1/5
(c) 5
(d) 25

D

(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.

Question. Assertion : All electric devices shown in the circuit are ideal. The reading of each of ammeter (A) and voltmeter (V) is zero.

Reason : An ideal voltmeter draws almost no current due to very large resistance, and hence (A) will read zero.

D

Question. Assertion : A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the circuit will increase.
Reason: The power dissipated in the circuit is directly proportional to the resistance of the circuit.

C

Question. Assertion : The equation V = Ri can be applied to those conducting devices which do not obey Ohm’s law.
Reason : V = Ri is a statement of Ohm’s law.

C

Question. Assertion : Insulators do not allow flow of current through themselves.
Reason : They have no free-charge carriers.

A

Question. Assertion : Long distance power transmission is done at high voltage.
Reason : At high voltage supply power losses are less.

A

Question. Assertion : Resistivity of material may change with temperature.
Reason : Resistivity is a material property & independent on temperature.

C

Question. Assertion : Resistance of 50W bulb is greater than that of 100 W.
Reason : Resistance of bulb is inversely proportional to rated power.

B

(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
(e) Both Assertion and Reason are false.

Question. Assertion : When current through a bulb decreases by 0.5% the glow of bulb decreases by 1%.
Reason : Glow (Power) which is directly proportional to square of current.

B

Question. Assertion : Alloys are commonly used in electrical heating devices, like electrical iron, toasters etc.
Reason : Alloys do not oxidise (burn) readily at high temperatures.

A

Question. Assertion : Heater wire must have high resistance will be melting point.
Reason : If resistance is high, the electric conductivity will be less.

A

Question. Assertion : 40 W tube light give more light in comparison to 40 w bulb.
Reason : Light produced is same from same power.

D

Question. Assertion : Long distance power transmission is done at high voltage.
Reason : At high voltage supply power losses are less.

B

Question. Assertion : 40 W tube light give more light in comparison to 40 w bulb.
Reason : Light produced is same from same power.

D

Question. Assertion : Kirchoff’s rule follows from conservation of charge.
Reason : Kirchoff’s loop rule follows from conservation of momentum.

C

Question. Assertion : A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the circuit will increase.
Reason : The power dissipated in the circuit will increase.

C

Question. Assertion : The value of the current in the ammeter is the same, independent of its position in the electric circuit.
Reason : In a series combination of resistors the current is the same in every part of the circuit or the same current through each resistor.

A

Question. Assertion : When the resistances are connected between the same two points, they are said to be connected in parallel.
Reason : In case the resistance is to be decreased, then the individual resistances are connected in parallel.

B

Fill in the Blanks :

Question. Combined resistance is the sum of separate resistances provided that the various conductors are connected in ……….

Series

Question. Kilowatt is the unit of electrical ……… but kilowatthour is the unit of electrical ………

Power, energy

Question. Tungsten wire is used in the electrical bulb due to ………..

high

Question. Energy spent in kilowatt-hour = volt x …….. x ……./1000

Ampere, hour

Question. The ………. is always connected in parallel across the points between which the potential difference is to be measured.

voltmeter

Question. A fuse is a short piece of wire of high ………. and low ………

Resistance, melting point

Question. The S.I. unit of resistance is ……….

Ohm (W )

Question. In an electric circuit, the direction of electric current is taken as ………. to the direction of the flow of electrons, which are of ………. charges.

opposite, negative

Question. The S.I. unit of resistivity is ………. .

Ohm-meter

Question. The S.I. unit of electric current is …………..

ampere

Question. The resistance of a wire is ………….. proportional to the square of its radius.

inversely.

Question. Two resistances of 2Ω each are connected in parallel. The equivalent resistance is ………….. .

1 Ω

Question. A fuse is a short piece of wire of high ………….. and low …………………

resistance, melting point

Question. Combined resistance is the sum of separate resistances provided that the various conductors are connected in ……….

series

Question. The unit of power is …………

watt (W)

Question. A fuse is connected in …………….. to the …………………. wire.

series, live

True / False :

Question. The commercial unit of electrical energy is kilowatthour (kWh).

True

Question. Pure tungsten has high resistivity and a high melting point (nearly 3000cC).

True

Question. The quantity of charge flowing past a point multiplied by time is a current.

False

Question. Direction of current is taken opposite to the direction of flow of electrons.

True

Question. When two resistances 1 W and 3 W are connected in parallel, their equivalent resistance is less than 1 W .

True

Question. A copper wire of length L and cross-sectional area A carries a currentI . If the specific resistance of copper is S , then electric field in the wire is Is/A.

True

Question. Ohm’s law is a relation between the power used in a circuit to the current and the potential difference.

False

Question. The resistivity of alloys decreases with the rise in temp.

False

Question. Fuse is a thin wire which melts and breaks the electric circuit due to only high voltage.

False

Question. The filament resistance of glowing bulb is greater, to its resistance when it is not glowing.

True

Question. The series arrangement is used for domestic circuits.

False

Question. Direction of current is taken opposite to the direction of flow of electrons.