Question # 1

The energy stored in a charge capacitor

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1/2CV²

1/2C²V

1/2C/V²

None of these

Which one of the following has larger value of relative permitivity E_rat room temperature?

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Vaccum

Air

Glass

Water

Which one of the following causes production of heat when current is set up in a wire?

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Fall of electrons from higher orbits to lower orbits

Inter-atomic collisions

Inter-electron collisions

Collisions of conduction electron with atoms

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be

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1840 KeV

1/1840 KeV

1 KeV

920 KeV

An alpha particle is accelerated through a potential difference of 10⁶volt. Its kinetic energy will be

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1 MeV

2 MeV

4 MeV

8 MeV

The SI unit of capacitance is

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Farad

Henry

Ohm

Volt

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

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2R

4R

16R

Zero

The electric lines of force are

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Imaginary

Physically existing everywhere

Physically existing near the charge

All of the above

Potentiometer is more sensitive than voltmeter, because

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Voltmeter has a very high resistance

Voltmeter has a very low resistance

Potentiometer does not draw any current from a source of unknown potential difference

Potentiometer is sensitive

The charge carriers in electrolyte are positive and negative

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protons

electrons

ions

none of these

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

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Charge Q

Potential V

Capacity

Energy U

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

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Q=V/C

Q=C/V

Q=1/2CV

Q=CV

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

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11/3 A

3 A

3/11 A

6

The SI unit of current is

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watt

coulomb

volt

ampere

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

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5

0.5

0.005

50

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