Question # 1

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

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

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

The de broglie wave corresponding to a particle of mass m and velocity v has a wavelength associated with it

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h/mv

hm v

mh/v

m/hv

Velocity of sound in a diatomic as is 300 m/sec what is its rms velocity

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

Two bodies with masses M_A and M_B are moving with equal kinetic energy.Their linear moments are numerically in a ratio | P_A| : |P_B| will be:

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M_B: M_A

M_A: M_B

√M_A : √M_B

M_A²: M_B²

In which case dose the potential energy decreases?

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On compressing a spring

On stretching s spring

One moving a body against gravitational force

One the rising of an air bubble in water

One cannot see through fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplets in fog

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

A moving charge will gain energy due to the application of

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Electric field

Magnetic

Both of these

None of these

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

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2

3

5

6

The sieman is the SI unit of

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Resistance

Specific Resistance

Conductance

Inductance

A man pushes a wall but fails to displace it. He does:

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Negative work

Maximum positive work

Positive work but not maximum

No work

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁=2R₂

R₂=2R₁

R₂=4R₁

R₁=4R₂

Mechanical waves on the surfaces of a liquid are

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Transverse

Longitudinal

Torsional

both transverse and longitudinal

A 2 kg body and a 3 kg body have equal momentum. If the kinetic energy of 3 kg body is 10 J, the KE of 2 kg body will be

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6.66 J

15 J

22.5 J

45 J

A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is

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Equal to unity

Equal to 1.33

Between unity and 1.33

Greater than 1.33

At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string of that instant is:

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Sinusoidal shape with amplitude A/3

Sinusoidal shape with amplitude A/2

Sinusoidal shape with amplitude A

Straight line

Which quantity is increased in step-down transformer?

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Current

Voltage

Power

Frequency

Absolute temperature can be calculated by

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Mean square velocity

Motion of the molecule

Both A and B

None of these

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

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

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