Current electricity

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 × volt
(Ampere)2 × 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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