# DC Circuits MCQs with Answers

### Chapter 1. DC Circuits

1. Which of the following is not an expression of power?
(a) P=VI
(b) P=I2R
(c) P=V2 /R
(d) P=I/R

2. Which of the following is not an expression of power?
(a) P=VI
(b) P=I2R
(c) P=V2 /R
(d) P=I/R

3. Which of the following is not an expression of power?
(a) P=VI
(b) P=I2R
(c) P=V2 /R
(d) P=I/R

4. Which of the following is not an expression of power?

(a) P=VI
(b) P=I2R
(c) P=V2 /R
(d) P=I/R

5. Kilowatt-hour (kWh) is a unit of?
(a) Current
(b) Power
(c) Energy
(d) Resistance

6. Kilowatt-hour (kWh) is a unit of?
(a) Current
(b) Power
(c) Energy
(d) Resistance

7. Kilowatt-hour (kWh) is a unit of?
(a) Current
(b) Power
(c) Energy
(d) Resistance

8. Kilowatt-hour (kWh) is a unit of?
(a) Current
(b) Power
(c) Energy (d) Resistance

9. Out of the following, which is not a source of electrical energy?
(a) Solar cell
(b) Battery
(c) Potentiometer
(d) Genertor

10. Out of the following, which is not a source of electrical energy?
(a) Solar cell
(b) Battery
(c) Potentiometer
(d) Genertor

11. Out of the following, which is not a source of electrical energy?
(a) Solar cell
(b) Battery
(c) Potentiometer
(d) Genertor

12. Out of the following, which is not a source of electrical energy?
(a) Solar cell
(b) Battery
(c) Potentiometer

(d) Genertor

13. Materials which easily allow the passage of electric current are known as _________
(a) Insulators
(b) Conductors
(c) Dielectrics
(d) Semi-conductors

14. Materials which easily allow the passage of electric current are known as _________
(a) Insulators
(b) Conductors
(c) Dielectrics
(d) Semi-conductors

15. Materials which easily allow the passage of electric current are known as _________
(a) Insulators
(b) Conductors
(c) Dielectrics
(d) Semi-conductors

16. Materials which easily allow the passage of electric current are known as _________
(a) Insulators
(b) Conductors
(c) Dielectrics
(d) Semi-conductors

17. Which of the following statements are true with regard to resistance?
(a) Resistance is directly proportional to a length of the wire
(b) Resistance is directly proportional to an area of cross-section of the wire
(c) Resistance is inversely proportional to the length of the wire
(d) Resistance is inversely proportional to the resistivity of the wire

18. Which of the following statements are true with regard to resistance?
(a) Resistance is directly proportional to a length of the wire
(b) Resistance is directly proportional to an area of cross-section of the wire
(c) Resistance is inversely proportional to the length of the wire
(d) Resistance is inversely proportional to the resistivity of the wire

19. Which of the following statements are true with regard to resistance?
(a) Resistance is directly proportional to a length of the wire
(b) Resistance is directly proportional to an area of cross-section of the wire
(c) Resistance is inversely proportional to the length of the wire
(d) Resistance is inversely proportional to the resistivity of the wire

20. Which of the following statements are true with regard to resistance?
(a) Resistance is directly proportional to a length of the wire
(b) Resistance is directly proportional to an area of cross-section of the wire
(c) Resistance is inversely proportional to the length of the wire
(d) Resistance is inversely proportional to the resistivity of the wire

21. Resistivity of a wire depends on
(a) length
(b) material
(c) cross sectional area
(d) none of these

22. Resistivity of a wire depends on
(a) length
(b) material
(c) cross sectional area
(d) none of these

23. Resistivity of a wire depends on
(a) length
(b) material
(c) cross sectional area
(d) none of these

24. Resistivity of a wire depends on
(a) length
(b) material
(c) cross sectional area
(d) none of these

25. A circuit contains two un-equal resistances in parallel
(a) current is same in both

(b) large current flows in larger resistance
(c) potential difference across each is same
(d) smaller resistance has smaller conductance

26. A circuit contains two un-equal resistances in parallel
(a) current is same in both
(b) large current flows in larger resistance
(c) potential difference across each is same
(d) smaller resistance has smaller conductance

27. A circuit contains two un-equal resistances in parallel
(a) current is same in both
(b) large current flows in larger resistance
(c) potential difference across each is same
(d) smaller resistance has smaller conductance

28. A circuit contains two un-equal resistances in parallel
(a) current is same in both
(b) large current flows in larger
(c) potential difference across each is same
(d) smaller resistance has smaller conductance

29. The resistance of a 100 W, 200 V lamp is
(a) 100 ohm
(b) 200 ohm
(c) 400 ohm
(d) 1600 ohm

30. The resistance of a 100 W, 200 V lamp is
(a) 100 ohm
(b) 200 ohm
(c) 400 ohm
(d) 1600 ohm

31. The resistance of a 100 W, 200 V lamp is
(a) 100 ohm
(b) 200 ohm
(c) 400 ohm
(d) 1600 ohm

32. The resistance of a 100 W, 200 V lamp is
(a) 100 ohm
(b) 200 ohm
(c) 400 ohm
(d) 1600 ohm

33. Ohm’s law is not applicable to
(a) DC circuits
(b) high currents
(c) small resistors
(d) semi-conductors

34. Ohm’s law is not applicable to
(a) DC circuits
(b) high currents
(c) small resistors
(d) semi-conductors

35. Ohm’s law is not applicable to
(a) DC circuits
(b) high currents
(c) small resistors
(d) semi-conductors

36. Ohm’s law is not applicable to
(a) DC circuits
(b) high currents
(c) small resistors
(d) semi-conductors

37. A wire of resistance R has its length and cross section both doubled. Its resistance will become
(a) 4 R
(b) 2 R
(c) R
(d) R/4

38. A wire of resistance R has its length and cross section both doubled. Its resistance will become

(a) 4 R
(b) 2 R
(c) R
(d) R/4

39. A wire of resistance R has its length and cross section both doubled. Its resistance will become
(a) 4 R
(b) 2 R
(c) R
(d) R/4

40. A wire of resistance R has its length and cross section both doubled. Its resistance will become
(a) 4 R
(b) 2 R
(c) R
(d) R/4

41. Many resistors connected in series will?
(a) Divide the voltage proportionally among all the resistors
(b) Divide the current proportionally
(c) Increase the source voltage in proportion to the values of the resistors
(d) Reduce the power to zero

42. Many resistors connected in series will?
(a) Divide the voltage proportionally among all the resistors

(b) Divide the current proportionally
(c) Increase the source voltage in proportion to the values of the resistors
(d) Reduce the power to zero

43. Many resistors connected in series will?
(a) Divide the voltage proportionally among all the resistors
(b) Divide the current proportionally
(c) Increase the source voltage in proportion to the values of the resistors
(d) Reduce the power to zero

44. Many resistors connected in series will?
(a) Divide the voltage proportionally among all the resistors
(b) Divide the current proportionally
(c) Increase the source voltage in proportion to the values of the resistors
(d) Reduce the power to zero

45. It is preferable to connect bulbs in series or in parallel?
(a) Series
(b) Parallel
(c) Both series and parallel
(d) Neither series nor parallel

46. It is preferable to connect bulbs in series or in parallel?
(a) Series
(b) Parallel
(c) Both series and parallel
(d) Neither series nor parallel

47. It is preferable to connect bulbs in series or in parallel?
(a) Series
(b) Parallel
(c) Both series and parallel
(d) Neither series nor parallel

48. It is preferable to connect bulbs in series or in parallel?
(a) Series
(b) Parallel
(c) Both series and parallel
(d) Neither series nor parallel

49. KCL is applied at
(a) Loop
(b) Node
(c) Both loop and node
(d) Neither loop nor node

50. KCL is applied at
(a) Loop
(b) Node
(c) Both loop and node
(d) Neither loop nor node