Electricity MCQ Quiz

30 questions

1. The SI unit of electric current is the

   1. volt
   2. ampere
   3. ohm
   4. coulomb

2. The SI unit of charge is the

   1. ampere
   2. coulomb
   3. volt
   4. joule

3. Current is defined as charge per unit

   1. area
   2. time
   3. volume
   4. mass

4. The SI unit of potential difference is the

   1. ampere
   2. volt
   3. ohm
   4. watt

5. Ohm's law states V =

   1. I/R
   2. IR
   3. R/I
   4. I²R

6. The SI unit of resistance is the

   1. volt
   2. ampere
   3. ohm
   4. watt

7. Resistance of a wire depends on length as

   1. inversely
   2. directly proportional
   3. no relation
   4. as square

8. Resistance of a wire depends on area of cross-section as

   1. directly
   2. inversely proportional
   3. as square
   4. no relation

9. The device used to measure current is the

   1. voltmeter
   2. ammeter
   3. galvanometer only
   4. rheostat

10. An ammeter is connected in a circuit in

    1. parallel
    2. series
    3. either way
    4. a separate loop

11. A voltmeter is connected

    1. in series
    2. in parallel
    3. in a separate circuit
    4. with a fuse

12. In series, the total resistance is

    1. less than smallest
    2. sum of resistances
    3. product/sum
    4. reciprocal sum

13. In parallel, the equivalent resistance is

    1. sum
    2. 1/R = 1/R1+1/R2+...
    3. product
    4. larger than each

14. Electric power is given by

    1. P=V/I
    2. P=VI
    3. P=I/V
    4. P=V−I

15. 1 kilowatt-hour equals

    1. 3.6×10³ J
    2. 3.6×10⁶ J
    3. 1000 J
    4. 3600 J

16. The commercial unit of electrical energy is the

    1. joule
    2. kilowatt-hour
    3. watt
    4. volt

17. Heat produced in a resistor is H =

    1. IRt
    2. I²Rt
    3. IR²t
    4. I/Rt

18. The material used for heating elements should have

    1. low melting point
    2. high resistivity and high melting point
    3. low resistance
    4. be an insulator

19. A fuse wire is made of material with

    1. high melting point
    2. low melting point
    3. zero resistance
    4. high resistance only

20. If length of a wire doubles (same volume), resistance becomes

    1. half
    2. double
    3. four times
    4. unchanged

21. Assertion: Household appliances are connected in parallel. Reason: Parallel connection gives the same voltage to each appliance.

    1. Both true, R explains A
    2. Both true, R not explanation
    3. A true, R false
    4. A false, R true

22. A 100 W, 220 V bulb operated at 110 V consumes

    1. 100 W
    2. 50 W
    3. 25 W
    4. 200 W

23. When a 4 Ω resistor is across a 12 V battery, current is

    1. 1 A
    2. 3 A
    3. 4 A
    4. 48 A

24. Resistivity of a conductor depends on

    1. length
    2. area
    3. nature and temperature of material
    4. shape

25. Charge on one electron is about

    1. 1.6×10⁻¹⁹ C
    2. 1.6×10¹⁹ C
    3. 9.1×10⁻³¹ C
    4. 3×10⁸ C

26. Good conductors have resistivity that is

    1. very high
    2. very low
    3. infinite
    4. zero always

27. If 300 C of charge flows in 60 s, current is

    1. 5 A
    2. 0.2 A
    3. 18000 A
    4. 6 A

28. Three 3 Ω resistors in parallel give equivalent resistance

    1. 9 Ω
    2. 3 Ω
    3. 1 Ω
    4. 6 Ω

29. In a series circuit the current through each resistor is

    1. different
    2. the same
    3. zero
    4. doubled

30. The potential difference needed to move charge is provided by a

    1. resistor
    2. cell/battery
    3. fuse
    4. switch

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