Question # 1

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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100 ev

10⁶e v

10³e v

1.0 e v

In the case of an incompressible fluid in stead flow the net rate of flow of mass entering one end of the tube of flow is equal to the net rate of flow of mass leaving the other end. This equation is called

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Quadratic equation

Equation of discontinuity

Equation of continuity

None of the above

The general theory of relativity treats problems involving

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inertial frame of references

accelerating frame of references

both of these

none of these

Astrophysics is a branch of physics, which deals with:

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Sub-atomic particles

Stars and galaxies

Light and sound

Music

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

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Remains constant

Decreases

Increases

Reduces to zero

At O° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational energy

Density

The charged nucleus of an atom itself spins its magnetic field

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equal to the field produced by orbital electrons

greater than the field produced by orbital electrons

much weaker than the field produced by orbital electrons

none of these

A full-scale deflection is obtained in a galvanometer with a current of few

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ampere

volts

milliampere

ohm

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

Which of the following is an example of a S.H.M?

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motion of a projectile

motion of a train along a circular path

motion of swing

electrons revolving sound the nucleus

The speed of light in a medium depends upon

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Its wavelength

Its frequency

Refractive index

All of these

Polaroid glass is used in sun glasses because

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It is fashionable

It has good color

It is cheaper

It reduces the light intensity to half on account of polarization

The product of force times the perpendicular distance between some point and the line of action of the force is

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The moment of inertia action on it

The moment of force about the chosen point

The angular momentum of the body

None of these

When a germanium atom is doped with phosphorous atoms it becomes

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N-type semiconductor

p-type semiconductor

An insulator

None of them

Which of the following is the relation of centripetal force?

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mv²/r

mv/r

mv³/r

mv³/r³

A spherical wavefront is that which has

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A source

A point source

An extended source

None of these

N-kg^-1is the unit of

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Velocity

Force

Acceleration

None of these

When a gas is compressed:

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Its internal energy decreases

Its temperature decreases

Its temperature increases

None of these

According to Young s experiment if frequency of light used is halved then fringe width becomes

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2/3

Double

Remains constant

Fringe

The rate at a which the angular displacement is changing with time is called

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Angular acceleration

Angular velocity

Average angular velocity

None of these

In YDS experiment, data given isλ=500 nm, d=1 mm, L=100cm,∆y come out to be:

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0.5 cm

0.5 mm

0.5 nm

0.5 m

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