Current electricity Archives - Page 3 of 9 - MCQ and Quiz for Exams

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

Aluminium

Paper

Rubber

Mica

Detailed SolutionWhich one of the following does not have negative temperature coefficient?

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

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

Detailed SolutionElectric pressure is also called

24. The filament of an electric bulb is made of

Carbon

Aluminium

Tungsten

Nickel

Detailed 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

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 SolutionWhich 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

Detailed SolutionInsulating materials have the function of

28. Bulbs in street lighting are all connected in

Parallel

Series

Series-parallel

End-to-end

Detailed 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

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 SolutionWith rise in temperature the resistance of pure metals

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