# MCQ Questions for Class 10 Science Chapter 12 Electricity

MCQ Questions for Class 10 Science Chapter 12 Electricity are effective because they can test a wide range of knowledge in a short amount of time. They play a very significant role in your final preparation for the exams.

The questions test the ability to recall and recognize the concepts learned. Practicing with Chapter 12 Class 10 Science MCQ questions will help you improve your speed and accuracy on the exam.

## Chapter 12 Electricity Class 10 Science MCQ Questions

1. The maximum resistance which can be made using four resistor each of resistance 1/2 Ω is
(a) 2 Ω
(b) 1 Ω
(c) 2.5 Ω
(d) 8 Ω
▶ (a) 2 Ω

2. The amount of heat produced in a conductor is
(a) directly proportional to the current flowing through it
(b) inversely proportional to the current flowing through it
(c) directly proportional to the square of the current flowing through it
(d) inversely proportional to the square of current flowing through it.
▶ (c) directly proportional to the square of the current flowing through it

3. A cylindrical conductor of length ‘l’ and uniform area of cross section ‘A’ has resistance ‘R’. The area of cross section of another conductor of same material and same resistance but of length ‘2l’ is
(a) A/2
(b) 3A/2
(c) 2A
(d) 3A
▶ (c) 2A

4. 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) voltage

5. What is immaterial for an electric fuse wire?
(a) Its specific resistance
(c) Its length
(d) Current flowing through it
▶ (c) Its length

6. Unit of electric power may also be expressed as:
(a) Volt-ampere
(b) Kilowatt-hour
(c) Watt-second
(d) Joule-second
▶ (a) Volt-ampere

7. Calculate the length of aluminium wire of area of cross-section 1 mm2 whose resistance is 1.56 × 10-2 Ω. Given, resistivity of aluminium is 2.6 × 10-8 Ω m.
(a) 60 mm
(b) 60 cm
(c) 60 m
(d) 6 m
▶ (b) 60 cm

8. When a 4 V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. The value of the resistance of the resistor is:
(a) 42
(b) 40 Ω
(c) 400 Ω
(d) 0.4 Ω
▶ (b) 40 Ω

9. 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) 110 W

10. Specific resistance is numerically equal to the resistance offered by
(a) 1 cm length of a conductor
(b) a conductor of unit cross section
(c) 1 cm length of conductor of 1 cm2 of cross section
(d) 1 cm3 of a conductor
▶ (c) 1 cm length of conductor of 1 cm2 of cross section

11. The given figure shows the I-V curve (i) for a nichrome wire of given length and cross-section.
Which of the following will yield the curve (ii)?

(a) Increase the length of nichrome wire.
(b) Decrease the thickness of nichrome wire.
(c) Replace the nichrome wire with a similar copper wire.
(d) Replace the nichrome wire with a similar silicon wire.
▶ (c) Replace the nichrome wire with a similar copper wire.

12. 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) low potential to high potential.

12. Suppose five resistances, each of 10 Ω, are provided to you. You are free to get the desired value by combining them. The desired value will lie in between
(a) 2 Ω to 50 Ω
(b) 20 Ω to 40 Ω
(c) 12 Ω to 50 Ω
(d) 10 Ω to 60 Ω
▶ (a) 2 Ω to 50 Ω

14. If current through a resistance is increased by 100%, simultaneously reducing resistance value to 25%, the new power dissipated will be
(a) same
(b) increased by 100%
(c) decreased by 400%
(d) increased by 400%
▶ (a) same

15. Two metallic wires A and B are connected in series. Wire A has length I and radius r, while wire B has length 2l and radius 2r. If both the wires are of same material then find the ratio of the total resistance of series combination to the resistance of the wire A.
(a) 3/4
(b) 3/2
(c) 6/2
(d) 6/5
▶ (b) 3/2

16. Consider a simple circuit containing a battery and three identical incandescent bulbs A, B and C. Bulb A is wired in parallel with bulb B and this combination is wired in series with bulb C. What would happen to the brightness of the other two bulbs if bulb A were to burn out?
(a) Only bulb B would get brighter.
(b) Both A and B would get brighter.
(c) Bulb B would get brighter and bulb C would get dimmer.
(d) There would be no change in the brightness of either bulb B or bulb C
▶ (c) Bulb B would get brighter and bulb C would get dimmer.

17. To determine the equivalent resistance of a series combination of two resistors R1 and R2, a student arrange the following set up.

Which one of the following statements will be true for this circuit? It gives
(a) incorrect reading for current I as well as potential difference V
(b) correct reading for current I but incorrect reading for potential difference V
(c) correct reading for potential difference V but incorrect reading for current I
(d) correct reading for both I and V.
▶ (b) correct reading for current I but incorrect reading for potential difference V

18. Electrical resistivity of a given metallic wire depends upon
(a) its length.
(b) its thickness.
(c) its shape.
(d) nature of the material.
▶ (d) nature of the material.

19. A piece of aluminium of finite length is drawn or stretched such that to reduce its diameter to one fourth its original value, its resistance will become
(a) 256 times
(b) four times
(c) eight times
(d) sixteen times
▶ (a) 256 times

20. A multimeter is used to measure
(a) current only
(b) resistance only
(c) voltage only
(d) current, resistance and voltage
▶ (d) current, resistance and voltage

21. The amount of heat energy produced in 5 minutes by an electric heater rated at 1000 W is
(a) 2 × 105 J
(b) 3 × 105 J
(c) 4 × 105 J
(d) 300 J
▶ (b) 3 × 105 J

22. Masses of three wires of copper are in the ratio 1:35 and their lengths are in the ratio of 5:31. The ratio of their electrical resistances are
(a) 1:3:5
(b) 5:3:1
(c) 1:15:125
(b) 5:3:1
(d) 125:15:1
▶ (d) 125:15:1

23. 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) neutral

24. Two bulbs of 100 W and 40 W are connected in series. The current through the 100 W bulb is 1 A. The current through the 40 W bulb will be:
(a) 0.4 A
(b) 0.6 A
(c) 0.8 A
(d) 1 A
▶ (d) 1 A