Question # 1

When n-type of semiconductor is heated

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Number of electrons increases while that of holes decreases

Number of holes increases while that of electrons decreases

Number of electrons and holes remains same

Number of electrons and holes increases equally

A voltmeter has resistance of 2000 ohms and it can measure up to 2V. If we want to increase its range to 10V then required resistance in series will be

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2000 Ω

4000 Ω

6000 Ω

8000 Ω

A p-n junction has a thickness of the order of

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1 cm

1 mm

10^-6 cm

10^-12 cm

The number of translation degrees of freedom for a diatomic gas is

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2

3

5

6

A particle moves along a circular path under the action of a force. The work done by the force is

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Zero

Positive and non-zero

Negative and non zero

None of above

If the amplitude of sound is doubled and the frequency reduced to one-fourth the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

A cable breaks if stretched by more than 2 mm it is cut into two equal parts how much either part can be stretched without breaking?

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0.25 m

0.5 m

1 mm

2 mm

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

If the period of oscillation of mass (M) suspended from a spring is 2s, then the period of mass 4M will be

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1 s

2 s

3 s

4 s

Copper and germanium are cooled to 70 K from room temperature then

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Resistance of copper increases while that of germanium decreases

Resistance of copper decreases while that of germanium increases

Resistance of both decreases

Resistance of both increases

When a Na ion and a CI ion are placed in air a force F acts between them when they are separated by a distance of 1 cm from each other the permittivity of air and the dielectric constant of water are ε₀ and K respectively When a piece of salt is placed in water then the force between Na⁺ and CI^- ions separated by a distance of 1 cm will be

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F

FK/ε₀

F/Kε₀

F/K

Two forces of 10N and 15N are acting simultaneously on an object in the same direction. Their resultant is

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Zero

5N

25N

150N

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

To make the frequency double of na oscillator we have to

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Double the mass

Half the mass

Quadruple the mass

Reduce the mass to one-fourth

The mass defect for the nucleus of helium is 0.0303 a.m.u What is the binding energy per nucleon for helium in MeV?

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28

7

4

1

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

A pendulum clock set to give correct time in Karachi is taken to Quetta. It would give correct time if

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The mass of the pendulum is increased

The mass of the pendulum is decreased

The length of the pendulum is increased

The length of the pendulum is decreased

A force of 10N is acting along y-axis. Its component along x-axis is

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10N

20N

100N

Zero N

The direction of induced current is such that it opposes the very cause that has produced it. This is the law of

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Lenz

Faraday

Kirchoff

Fleming

A body moving in circular motion with constant speed has

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Constant velocity

Constant acceleration

Constant kinetic energy

Constant displacement

A monochromatic source of light is placed at a large distance d from a metal surface. Photoelectrons are ejected at rate n, kinetic energy being E. If the source is brought nearer to distance d/2, the rate and kinetic energy per photoelectron become nearly

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2n and 2E

4n and 4E

4n and E

N and 4E

Centre of mass is a point

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Which is geometric centre of a body

From which distance of particles are same

Where the whole mass of the body is supposed to be centered

Which is the origin of reference frame

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

When light wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however, light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters?

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1 : 2

2 : 1

4 : 1

1 : 4

The peak voltage in 220 volt A.C. supply is nearly

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220 volt

253 volt

311 volt

440 volt

What is the average energy of N molecules of monoatomic gas?

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1/2 NKT

NKT

3/2 NKT

5/2 NKT

The force between two charges 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

Surface tension of water is due to

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Inter molecular attractions

Intermolecular spaces

Inter molecular repulsion

None of above

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