﻿ Ohms Law Objective Questions and Answers - Inst Tools

# Ohms Law Objective Questions and Answers

In this article, we shared the ohms law objective questions and answers for electrical and electronics engineers.

## Ohms Law Objective Questions

The below list provides all the multiple-choice questions related to basics and examples of problems on ohms law.

Answers are available at the bottom of the article.

1. A closed switch has a resistance of

2. The resistance of a few meters of wire conductor in a closed electrical circuit is

3. For which of the following substances the temperature coefficient of resistivity is positive?

4. Which of the following materials has the least resistivity?

5. The resistance of a copper wire 200 m long is 21 ω.​

If its thickness (diameter) is 0.44 mm, its specific resistance is around

6. Temperature coefficient of resistance is expressed in terms of

7. Specific resistance of a conductor depends upon

8. Heat in a conductor is produced on the passage of electric current due to

9. Which resistor will be physically larger in size?

10. A light bulb draws 300 mA when the voltage across it is 240 V.​

The resistance of the light bulb is

11. A 3 ω resistor having 2 A current will dissipate the power of

12. With rise in temperature the resistance of semiconductors

13. Voltage dependent resistors are usually made from

14. For determining the polarity of the voltage drop across a resistor, it is necessary to know the

15. Three resistances of 10 ohms, 15 ohms, and 30 ohms are connected in parallel.​

The total resistance of the combination is

16. Which of the following materials possesses the least specific resistance?

17. The temperature coefficient of resistance of an insulator is

18. Two resistors R1 and R2 give combined resistance of 4.5 ω when in series and 1 ω when in parallel, the resistances are

19. Conductance is reciprocal of

20. If the length of a wire of resistance R is uniformly stretched to n times its original value, its new resistance is

21. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 ω.​

If the same four wires are connected is series the effective resistance will be

22. Voltage dependent resistors are used

23. The resistance of a parallel circuit consisting of two branches is 12 ohms.​

If the resistance of one branch is 18 ohms, what is the resistance of the other?

24. In a series circuit with unequal resistances

25. Two resistances R1 and R2 are connected in series across the voltage source where R2 > R1. The largest drop will be across

26. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes

27. A network consists of linear resistors and ideal voltage source.​

If the value of the resistors are doubled, then voltage across each resistor is

28. The specific resistance of all metals is most affected by

29. A resistance having rating 10 ohms, 10 W is likely to be a

30. Four resistances 80 ω, 50 ω, 25 ω and R are connected in parallel.​

Current through 25 ω resistance is 4 A.​

Total current of the supply is 10 A.​

The value of R will be

31. A rheostat differs from a potentiometer in the respect that it

32. Two resistors are said to be connected in series when

33. Which of the following statements is correct regarding resistance?

34. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals

35. A thermistor has

36. Specific resistance of a substance is measured in

37. The resistance of two wires is 25 ω when connected in series and 6 ω when joined in parallel. The resistance of each wire is

38. With rise in temperature the resistance of pure metals

39. Resistance of a wire always increases if

40. Varistors are

41. In equal resistances are first connected in series and then connected in parallel.​

What is the ratio of the maximum to the minimum resistance?

42. Resistance of material always decreases if

43. The resistance of a straight conductor does not depend upon its

44. In a circuit containing two unequal resistors connected in parallel

45. The specific resistance of a wire depends upon

46. The temperature coefficient of resistance of a wire is 0.0008°C.​

If the resistance of the wire is 8 ohm at 0°C, what is the resistance at 100°C?

47. A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12ohms respectively.​

The current in each branch is

48. In an ordinary heater if the length of the coil is halved, then a given quantity of water will boil

49. Twelve 1 ω resistance are used as edges to form a cube.​

The resistance between two diagonally opposite corners of the cube is

50. Which of the following is an ohmic conductor?

51. Which of the following quantities remain the same in all parts of a series circuit?

52. You have to replace 1500 ω resistor in radio.​ You have no 1500 ω resistor but have several 1000 ω ones which you would connect

53. An open resistor, when checked with an ohm-meter reads

54. Two copper conductors have equal length.​

The cross-sectional area of one conductor is four times that of the other.​

If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductors will be

55. The insulation resistance of a cable of length 10 km is 1 Mega Ohm’s.​

For a length of 100 km of same cable, the insulation resistance will be

56. The temperature coefficient of resistance of some material is negative. The material is

57. The temperature coefficient of resistance of conductors is

58. Three resistances each of R Ω are corrected to form a triangle.​ The resistance between any two terminals will be

59. In a circuit a 33 ω resistor carries a current of 2 A. The voltage across the resistor is

60. The example of non-ohmic resistance is

61. Reciprocal of specific resistance is

62. The resistance of a conductor varies inversely as

63. How are 500 ω resistors connected so as to give an effective resistance of 750ω?

64. Three parallel resistive branches are connected across a dc supply.​

What will be the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio R1 : R2 : R3 : : 2 : 4 : 6 ?