Question # 1

Certain charge +q is placed at the center of a sphere. At each of the sphere,The directions of electric intensity and vector area are:

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Same

Different

Opposite to each other

At 60º with each other

Both (B) and (C)

When two progressive waves of nearly same frequencies superimpose and give rise to beats, then

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Frequency of beat changes with time

Frequency of beat changes with location of observer

All particles of medium vibrate simple harmonically with frequency equal to the difference between frequencies of component waves

Amplitude of vibration of particles at any point changes simple harmonically with frequency equal to difference between two component waves

When a shall explodes a mid-air, the total momentum of its fragments is

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less than the momentum of shell

equal to the momentum of shell

greater than the momentum of shell

none of them

The mass of the object is a quantities measure of its

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speed

velocity

acceleration

inertia

The branch of physics which deals with the properties of fundamental particles is called:

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High energy physics

Molecular physics

Astrophysics

Space physics

Two bodies of masses 1 kg and 5 kg are dropped gently form the top of a tower. A a point 20 cm from the ground both the bodies will have the same

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Momentum

Kinetic energy

Velocity

Total energy

Direction of motion _________ in circular motion

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Changes off and on

Changes continously

Does not change

None of them

The alternative voltage of current is actually measured by:

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Its RMS value

Square root of its mean square value

Instantaneous value

Peak value

Both (A) and (B)

Solar cell converts sunlight directly into

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potential energy

thermal energy

mechanical energy

electrical energy

The branch of physics which deals with the structure and properties of solids is called:

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Plasma physics

Solid state physics

Any of above

Astrophysics

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

Fast moving atomic particles, accelerated in an accelerator are applicable to the new branch of Physics is

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Newtonian mechanics

Relativistic mechanics

Classical mechanics

None of these

As cross-sectional area of the pipe decreases the speed of fluids must increase according to

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Bernoulli's equation

Venture's reaction

Equation of continuity

Torricelli's theorem

Fraunhofer's lines commonly visible in the sun's spectrum are examples of

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Line emission spectrum

Line absorption spectrum

Band emission spectrum

Band absorption spectrum

The total flux through a closed surface does not depend on

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Geometry of closed surface

Medium

Charge used temperature

None of these

The critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

Shear modulus for water is

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- 4.7

- 3.3

- 1.2

0

When temperature increases, frequency of organ pipe:

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Decreases

Remains the same

Increases

Becomes zero

If the mass of the body is M on the earth surface, then the mass of the same body on the moon

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M/6

Zero

M

None of these

If C and R denote capacity and resistance,the dimensional formula of CR is

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M°L°T^-1

M°L°T°

Not expressible in terms of MLT

Rest mass energy of electron is:

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1.02 MeV

0.51 MeV

931 MeV

200 MeV

All changes which occur suddenly are irreversible through

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Conduction

Convection

Radiation

All of these

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