Current electricity Archives - Page 5 of 9 - MCQ and Quiz for Exams

41. A field of force can exist only between

Two molecules

Two ions

Two atoms

Two metal particles

Detailed SolutionA field of force can exist only between

42. The property of a conductor due to which it passes current is called

Resistance

Reluctance

Conductance

Inductance

Detailed SolutionThe property of a conductor due to which it passes current is called

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

0.4 ohm

0.6 ohm

0.8 ohm

1.0 ohm

Detailed SolutionIf a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes

44. Varistors are

Insulators

Nonlinear resistors

Carbon resistors

Resistors with zero temperature coefficients

Detailed SolutionVaristors are

45. A thermistor has

Positive temperature coefficient

Negative temperature coefficient

Zero temperature coefficient

Variable temperature coefficient

Detailed SolutionA thermistor has

46. All of the following are equivalent to watt except

Joule/second

Ampere Ã volt

(Ampere)2 Ã ohm

Ampere/volt

Detailed SolutionAll of the following are equivalent to watt except

47. Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?

100 W lamp will glow brighter

40 W lamp will glow brighter

Both lamps will glow equally bright

40 W lamp will fuse

Detailed SolutionTwo lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?

48. Electric current passing through the circuit produces

Magnetic effect

Luminous effect

Thermal effect

Chemical effect

Detailed SolutionElectric current passing through the circuit produces

49. When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will

Decrease

Increase

Remain constant

None of the above

Detailed SolutionWhen resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will

50. What is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is

Practically zero

Low

High

Very high

Detailed SolutionWhat is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is

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