Question # 1

The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will

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Increase

Decrease

Remain F

Become 10F/9

The SI unit of permitivity is

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Nm²C²

N^-1m^-2C²

NmC²

Nm²C^-1

The resistance of an incandescent lamp is

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Smaller when switched on

Greater when switched off

The same whether it is switch off or switch on

Greater when switched on

The electric intensity at infinite distance from the point charge will be

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Infinite

Positive

Zero

Negative

Physicist George Simon ohm was a

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German physical

French physicist

Chinese physicist

Russian physicist

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5μF

10μF

3μF

6μF

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

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1/3 V

2/3 V

3/2 V

3V

Which one of the following is the unit of electric field intensity

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JC^-1

Vm^-1

Cm^-1

CJ^-1

Electric potential of earth is taken to be zero because the earth is good

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Semiconductor

Conductor

Insulator

Dielectric

Resistance of a conductor depends upon

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the quantity of current passing through it

the voltage applied between its end

its dimensions, physical state and nature of its material

all of the above

One electron volt is equal to

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1.6 x 1019eV

6.25 x 1018 eV

1.6 x 1018 eV

6.25 x 1019eV

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

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negative charges

positive charges

protons

electrons

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

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 hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

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Zero

5μC m^-2

20μC m^-2

8μC m^-2

The relation between charge 'Q' and current 'I' is given by

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Q = I/t

Q = It

Q = I²t

Q = I²/t

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