Current electricity Archives

31. 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

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

Compounds of silver

Liquid metals

Metallic alloys

Electrolytes

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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

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

Cast iron

Copper

Carbon

Tungsten

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34. 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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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 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 Solution

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

Reactor

Capacitor

Resistor

Detailed SolutionWhether circuit may be AC. or D.C.

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

one, following is most effective in reducing the magnitude of the current.

36. Resistance of a tungsten lamp as applied voltage increases

Decreases

Increases

Remains same

None of the above

Detailed

Solution

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

1840

1480

Detailed SolutionThe ratio

of mass of proton to that of electron is nearly

38. 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

Detailed SolutionIn a lamp load when

more than one lamp are switched on the total resistance of the load

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

Copper

Gold

Silver

Paper

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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">Out of the following which is an insulating material?

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