Current electricity

81. In a circuit a 33 Ohm resistor carries a current of 2

The voltage across the resistor is A. 33 V
66 V
80 V
132 V

Detailed SolutionIn

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a circuit a 33 Ohm resistor carries a current of 2

82. Which of the following can have negative temperature coefficient?

Compounds of silver
Liquid metals
Metallic alloys
Electrolytes

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class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-can-have-negative-temperature-coefficient/#more-44028">Detailed SolutionWhich of the following can have negative temperature coefficient?

83. Out of the following which is not a poor conductor?

Cast iron
Copper
Carbon
Tungsten

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class="screen-reader-text">Out of the following which is not a poor conductor?

84. The resistance of a copper wire 200 m long is 21 $$\Omega .$$ If its thickness (diameter) is 0.44 mm, its specific resistance is around

1.2 x 10-8 $$Omega $$-m
1.4 x 10-8 $$Omega $$-m
1.6 x 10-8 $$Omega $$-m
1.8 x 10-8 $$Omega $$-m

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512"> Subscribe on YouTube 21 $$\Omega .$$ If its thickness (diameter) is 0.44 mm, its specific resistance is around" class="read-more button" href="https://exam.pscnotes.com/mcq/the-resistance-of-a-copper-wire-200-m-long-is-21-omega-if-its-thickness-diameter-is-0-44-mm-its-specific-resistance-is-around/#more-43848">Detailed SolutionThe resistance of a copper wire 200 m long is 21 $$\Omega .$$ If its thickness (diameter) is 0.44 mm, its specific resistance is around

85. Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.

Reactor
Capacitor
or
Resistor

Detailed SolutionWhether circuit may be AC. or D.C. one, following

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is most effective in reducing the magnitude of the current.

86. Resistance of a tungsten lamp as applied voltage increases

Decreases
Increases
Remains same
None of the above

Detailed

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SolutionResistance of a tungsten lamp as applied voltage increases

87. The ratio of mass of proton to that of electron is nearly

1840
1480
30
4

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288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 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 class="screen-reader-text">The ratio of mass of proton to that of electron is nearly

88. In a lamp load when more than one lamp are switched on the total resistance of the load

Increases
Decreases
Remains same
None of the above

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total resistance of the load" class="read-more button" href="https://exam.pscnotes.com/mcq/in-a-lamp-load-when-more-than-one-lamp-are-switched-on-the-total-resistance-of-the-load/#more-42869">Detailed SolutionIn a lamp load when more than one lamp are switched on the total resistance of the load

89. Out of the following which is an insulating material?

Copper
Gold
Silver
Paper

Detailed

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64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 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
SolutionOut of the following which is an insulating material?

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