Question # 1

The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:

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Critical temparature

Temperature of vaporization

Melting point

Both (A) and (C)

Both (A) and (B)

Astrophysics is a branch of physics, which deals with

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Sub-atomic

Stars and galaxies

Light and sound

Music

When a platinum wire is heated, it appears white at

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1600°C

900°C

1100°C

1300°C

Time period of simple pendulum is independent of

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length

mass

acceleration due to gravity

none of them

The velocity of sound in air not effected by changes in

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Moisture contents in air

Temperature of air

The atmosphere pressure

The composition of air

Particles have the mass smallest of following is:

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Electron

Proton

Neutron

Quark

Each atom in metal crystal:

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Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about center of a crystal

None of these

Wave length of light, on the average, is given by:

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10^-14_m

10^-10_m

10^-6_m

10^-4_m

Electromagnetic radiation or photons interact with matter in

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two distinct ways

three distinct ways

four distinct ways

five distinct ways

If mass of 10 gm is suspended from a spring of K=0.8 Nm^-1then the extension will be:

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10 cm

1 m

10 mn

None of these

The magnitude of induced emf depends upon the

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

The original source of solar energy is

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Moon

Sun

Stars

Earths

Accuracy of a measurement depends on

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Percentage uncertainty

Fractional uncertainty

Less absolutely

None of these

When satellite is moving in a circle, it has an aceleration

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mV²/r

ωr/V

V²/r

ωV/r

What are the rations among the volumes of gases of ³²O₂,²H₂ and ¹⁶CH₄, If they taken in equal masses?

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2 : 16 : 1

2 : 16 : 2

1 : 1 : 1

1 : 16 : 2

At what point/points in its path does a projectile have its maximum speed ?

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At the point of projection

At the point where its strikes the ground

Both

None of these

The light source in the transmitter can be either

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Light emitting diode

Semiconductor laser

Light emitting in an invisible infra red

All of these

A body of mass 1.0 kg is falling with an acceleration of 10 m/s² Its apparent weight will be (g = 10 m/s²)

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1.0 kg wt

2.0 kg wt

0.5 kg wt

Zero

The work done by the gas during the isobaric expansion is equal to

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Area of rectangle

Area of triangle

Area of parallelogram

None of these

The simplest type of rectification known as half wave rectification is obtained by

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Using a transistor

Suppressing the harmonics in A.C. voltage

Suppressing half wave of A.C. supply by using diode

Using a Coolidge

In n-type substances the minority carriers are

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Holes

Electrons

Neutrons

None

The blood pressure of the person

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Decreases with age

Increases with age

Remains the same

None

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