Current electricity

41. A field of force can exist only between

Two molecules
Two ions
Two atoms
Two metal particles

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button" href="https://exam.pscnotes.com/mcq/a-field-of-force-can-exist-only-between/#more-52804">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

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class="read-more button" href="https://exam.pscnotes.com/mcq/the-property-of-a-conductor-due-to-which-it-passes-current-is-called/#more-52710">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

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resistance becomes" class="read-more button" href="https://exam.pscnotes.com/mcq/if-a-wire-conductor-of-0-2-ohm-resistance-is-doubled-in-length-its-resistance-becomes/#more-52642">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

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45. A thermistor has

Positive temperature coefficient
Negative temperature coefficient
Zero temperature coefficient
Variable temperature coefficient

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href="https://exam.pscnotes.com/mcq/a-thermistor-has/#more-51607">Detailed SolutionA thermistor has

46. All of the following are equivalent to watt except

Joule/second
Ampere × volt
(Ampere)2 × ohm
Ampere/volt

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button" href="https://exam.pscnotes.com/mcq/all-of-the-following-are-equivalent-to-watt-except/#more-51431">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

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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

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href="https://exam.pscnotes.com/mcq/electric-current-passing-through-the-circuit-produces/#more-51134">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

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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

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