Current electricity Archives

21. Which one of the following does not have negative temperature coefficient?

Aluminium

Paper

Rubber

Mica

Detailed

Solution

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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23. Electric pressure is also called

Resistance

Power

Voltage

Energy

Detailed SolutionElectric pressure is also

called

24. The filament of an electric bulb is made of

Carbon

Aluminium

Tungsten

Nickel

Detailed Solution

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class="screen-reader-text">The 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

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

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Solution