Question # 1

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

As the electron in Bohr orbit of hydrogen atom passes from stat n = 2 to n = 1 the kinetic energy K and potential energy U change as

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K two-fold,U also two-fold

K four-fold,U also four-fold

K four-fold,U two-fold

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

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2

3

5

6

If two non-zero vector ̅A̅ and ̅B are parallel to each other, then ̅A̅, ̅B is equal to

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Zero

AB

A + B

A - B

A photoelectric cell converts

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Electrical energy to light energy

Light energy to light energy

Light energy to electrical energy

Light energy to elastic energy

Electrons in the atom are held in the atom due to

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Coulomb forces

Nuclear forces

Gravitational forces

Van der Waal's forces

Which of the following is the only vector quantity

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Temperature

Energy

Power

Momentum

In a common base transistor circuit the current gain is 0.98.On changing the emitter current by 5.00 mA, the change in collector current is:

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0.196 mA

2.45 mA

4.9 mA

5.1 mA

A 50-volt battery is connected across 10-ohm resistor.The current is 4.5 A.The internal resistance of the battery is

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Zero

0.5 Ω

1.1 Ω

5.0 Ω

A piece of fuse wire melts when a current of 15 ampere flows through it.With this current, if it dissipates 22.5 W. the resistance of fuse wire will be

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Zero

10 Ω

1 Ω

0.10 Ω

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

When the displacement is half of the amplitude the ratio of potential energy to the total energy is

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1/2

1/4

1

1/8

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 os increased

The length of the pendulum is decreased

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

Absolute temperature can be calculated by

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Mean square velocity

Motion of the molecule

Both (A) and (B)

None of these

Which of the following four statement is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

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

A photoelectric cell coverts

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Electrical energy to light energy

Light energy to light energy

Light energy to electrical energy

Light energy to elastic energy

How does the Young's modulus vary with the increase of temperature?

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Decrease

Increases

Remains constant

First increases and then decreases

The length of a telescope is 36 cm. The focal lengths of its lenses can be

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30 cm, 6 cm

-30 cm, -6 cm

30 cm, -6cm

-30cm, 6cm

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

In a simple harmonic motion (SHM), which of the following does not hold?

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To force on the particle is maximum at the ends

The acceleration in minimum at the mean position

The potential energy is maximum at the mean position

The kinetic energy is maximum at the mean position

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is

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R/4

R/3

R/2

R

Band spectrum is produced by

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H

He

H₂

Na

The velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s. The velocity 3s before in m/s is:

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8

4

6

7

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

Which of the following is a scalar quantity?

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Density

Displacement

Torque

Weight

There are discrete energy levels in atoms. It was first experimentally demonstrated by

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Rutherford's experiment

Franck Hertz experiment

Marsden's experiment

Somerfield experiment

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

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