Current electricity

22. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes

$$ rac{1}{9}$$ times
3 times
9 times
Unchanged

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without change in volume, the new resistance of wire becomes" class="read-more button" href="https://exam.pscnotes.com/mcq/copper-wire-of-certain-length-and-resistance-is-drawn-out-to-three-times-its-length-without-change-in-volume-the-new-resistance-of-wire-becomes/#more-55880">Detailed SolutionCopper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes

23. Electric pressure is also called

Resistance
Power
Voltage
Energy

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button" href="https://exam.pscnotes.com/mcq/electric-pressure-is-also-called/#more-55819">Detailed SolutionElectric pressure is also called

24. The filament of an electric bulb is made of

Carbon
Aluminium
Tungsten
Nickel

Detailed

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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
SolutionThe filament of an electric bulb is made of

25. Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open

There will be heavy current in the main line
Rest of the two bulbs will not light
All three bulbs will light
The other two bulbs will light

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bulb burns open" class="read-more button" href="https://exam.pscnotes.com/mcq/three-60-w-bulbs-are-in-parallel-across-the-60-v-power-line-if-one-bulb-burns-open/#more-55486">Detailed SolutionThree 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open

26. Which method can be used for absolute measurement of resistances?

Lorentz method
Raleigh method
Ohm's law method
Wheatstone bridge method

Detailed Solution

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class="screen-reader-text">Which method can be used for absolute measurement of resistances?

27. Insulating materials have the function of

Preventing a short circuit between conducting wires
Preventing an open circuit between the voltage source and the load
Conducting very large currents
Storing very high currents

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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 function of" class="read-more button" href="https://exam.pscnotes.com/mcq/insulating-materials-have-the-function-of/#more-55335">Detailed SolutionInsulating materials have the function of

28. Bulbs in street lighting are all connected in

Parallel
Series
Series-parallel
End-to-end

Detailed

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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
SolutionBulbs in street lighting are all connected in

29. Voltage dependent resistors are used

For inductive circuits
To suppress surges
As heating elements
As current stabilizers

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used" class="read-more button" href="https://exam.pscnotes.com/mcq/voltage-dependent-resistors-are-used/#more-55094">Detailed SolutionVoltage dependent resistors are used

30. With rise in temperature the resistance of pure metals

Increases
Decreases
First increases and then decreases
Remains constant

Detailed

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SolutionWith rise in temperature the resistance of pure metals

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