Question # 1

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

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Increases

Decreases

Remain unchanged

Becomes infinite

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

Battery is charged in motor cars, which is based on

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Chemical effect

Magnetic effect

Electric effect

None

The charge carriers in electrolyte are positive and negative

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protons

electrons

ions

none of these

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

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One joule

One erg

One electron volt

None of these

At ordinary temperature, an increase in temperature increases the conductivity of

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Conductor

Semiconductor

Insulator

Alloy

One coulomb of charge is created by

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10 electrons

1.6 x 10^-19electrons

6.25 x 10¹⁸electrons

6.25 x 10²¹electrons

The electric flux is linked with a surface will be maximum when

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The surface is held parallel to the electric field

The surface is held perpendicular to the electric field

The surface makes an angle of 45° with the electric field

All of the above

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decresase

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

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11.0 ohm

1.0 ohm

7.0 ohm

3.0 ohm

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

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Ve

V/e

e/V

2Ve

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

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108 g

10.8 g

0.8 g

108/0.8 g

If the two charges in Coulomb's law have double distance between them, then electric force

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Becomes two-fold

Becomes four-fold

Remains the same

None of these

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

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180 watt

10 watt

20 watt

60 watt

Electron volt is the unit of.

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Potential difference

Energy

Resistance

Capacitance

Magnetic effect at a point caused due to flow a current depend upon the

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Quantity of current

Distance from current

Both the quantity of current and distance from current element

None of the all

10⁶electrons are moving through a wire per second, the current developed is

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1.6 x 10^-19

1 A

1.6 x 10^-15A

10⁶A

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

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1310 W

670 W

810 W

1210 W

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

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Time constant

Decay constant

None of these

All of above

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

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3/5 ohm

2 ohm

6/5 ohm

3 ohm

The earth's potential is taken as

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Negative

Positive

Zero

Infinite

Surface density of charge is defined as

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Charge per unit volume

Charge per unit length

Charge per unit area

Charge per unit mass

The SI unit of permitivity is

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Nm²C²

N^-1m^-2C²

NmC²

Nm²C^-1

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

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C

C/2

Zero

2C

A current of 1.6 A is passed through a solution of CuSO_{4. How many Cu}²⁺ions are liberated in one minute?

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3 x 10²⁰

3 x 10¹⁰

6 x 10²⁰

6 x 10¹⁰

Cause of heat production in a current carrying conductor is

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Collisions of free electrons with one another

High drift speed of free electrons

Collisions of free electrons with atoms or ions of conductor

High resistance value

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

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

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7.20 N

11.25 N

22.50 N

45.00

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