Current electricity

52. Switching of a lamp in house produces noise in the radio. This is because switching operation produces

Arcs across separating contacts
Mechanical noise of high intensity
Both mechanical noise and arc between contacts
None of the above

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is because switching operation produces" class="read-more button" href="https://exam.pscnotes.com/mcq/switching-of-a-lamp-in-house-produces-noise-in-the-radio-this-is-because-switching-operation-produces/#more-50619">Detailed SolutionSwitching of
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a lamp in house produces noise in the radio. This is because switching operation produces

53. When electric current passes through a metallic conductor, its temperature rises. This is due to

Collisions between conduction electrons and atoms
The release of conduction electrons from parent atoms
Mutual collisions between metal atoms
Mutual collisions between conducting electrons

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metallic conductor, its temperature rises. This is due to" class="read-more button" href="https://exam.pscnotes.com/mcq/when-electric-current-passes-through-a-metallic-conductor-its-temperature-rises-this-is-due-to/#more-50316">Detailed
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SolutionWhen electric current passes through a metallic conductor, its temperature rises. This is due to

54. Nichrome wire is an alloy of

Lead and zinc
Chromium and vanadium
Nickel and chromium
Copper and silver

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0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube
class="read-more button" href="https://exam.pscnotes.com/mcq/nichrome-wire-is-an-alloy-of/#more-50169">Detailed SolutionNichrome wire is an alloy of

55. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?

$$rac{3}{2}Omega $$
6 $$Omega $$
4 $$Omega $$
$$rac{8}{3}Omega $$

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between any two corners?" class="read-more button" href="https://exam.pscnotes.com/mcq/three-6-ohm-resistors-are-connected-to-form-a-triangle-what-is-the-resistance-between-any-two-corners/#more-50150">Detailed SolutionThree 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?

56. The number of electrons in the outer most orbit of carbon atom is

3
4
6
7

Detailed SolutionThe number of

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electrons in the outer most orbit of carbon atom is

57. Ohm’s law is not applicable to

Semiconductors
D.
circuits C. Small resistors
High currents

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132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube href="https://exam.pscnotes.com/mcq/ohms-law-is-not-applicable-to/#more-49031">Detailed SolutionOhm’s law is not applicable to

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

10 W
20 W
40 W
60 W

Detailed SolutionWith three resistances connected in parallel, if each dissipates

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20 W the total power supplied by the voltage source equals

59. Conductance is reciprocal of

Resistance
Inductance
Reluctance
Capacitance

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class="read-more button" href="https://exam.pscnotes.com/mcq/conductance-is-reciprocal-of/#more-48982">Detailed SolutionConductance is reciprocal of

60. Which of the following materials has a negative temperature coefficient of resistance?

Copper
Aluminum
Carbon
Brass

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button" href="https://exam.pscnotes.com/mcq/which-of-the-following-materials-has-a-negative-temperature-coefficient-of-resistance/#more-48817">Detailed SolutionWhich of the following materials has a negative temperature coefficient of resistance?
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