Current electricity Archives

31. A glass rod when rubbed with silk cloth is charged because

It takes in proton

Its atoms are removed

It gives away electrons

It gives away positive charge

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32. The insulation on a current carrying conductor is provided

To prevent leakage of current

To prevent shock

Both of above factors

None of above factors

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33. International ohm is defined in terms of the resistance of

A column of mercury

A cube of carbon

A cube of copper

The unit length of wire

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34. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is

400 Ohms

600 Ohms

800 Ohms

1000 Ohms

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35. Which of the following materials has the least resistivity ?

Zinc

Lead

Mercury

Copper

Detailed

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Solution

36. Which of the following quantities remain the same in all parts of a series circuit?

Voltage

Current

Power

Resistance

Detailed

Solution

37. In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains

Length of heating element should be decreased

Length of heating element should be increased

Length of heating element has no effect on heating if water

None of the above

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