Question # 1

The time rate of change of displacement is called:

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Time

Acceleration

Speed

Velocity

The contrast in the fringes in an interference pattern depends upon

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Fringe width

Relative difference intensities of the two sources

Distance between the slits

Wavelength

In full wave rectification, simultaneous action is that:

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Two diodes conduct and two do not.

One diode conduct and three do not.

Three diodes conduct and one does not.

All the four diodes conduct

None of these

The closed loop gain of the inverting amplifier is written as

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G = R₂/R₁

G = 1 + R₂/R₁

G = -R₂/R₁

G = 1 - R₂/R₁

In LCR circuit which one of the following statement is correct?

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L and R oppose each other

R value increase with frequency

The inductive reactance increases with frequency

The capacitive reactance increases with frequency

When body moves along a circular path with constant speed, it has an acceleration, which is always directed;

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Along the tangent

Towards the centre

Away from the centre

None of them

The critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

Longitudinal waves are also called:

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Congressional waves

Transverse waves

Radio waves

None of them

The induced current in a conductor depends upon

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both A and B

None of these

For production of beats the two sources must have

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Different frequencies and same amplitude

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same phase

Neutron was discovered in

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1915

1920

1925

1932

In 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

When a platinum wire is heated, it appears orange red at

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500°C

900°C

1100°C

1300°C

When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to:

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Zero

Its average velocity

Its angular displacement

None of these

If an amount of heat enters the system it could

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decrease the internal energy

not change the internal energy

increase the internal energy

none of them

The SI unit of viscosity is

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kg m^-1s^-1

kg ms^-1

kg m^-1s^-2

kg m^-1s

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

When temperature increase, the frequency of a tuning fork

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Increases

Decreases

Remains same

Increase or decreases depending on the material

The portion of the water above its mean level forms a:

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Crest

Trough

Both A and B

None of these

The magnetic field outside the solenoid due to current is

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strong

zero

weak

uniform

When there is no relative motion between the magnet and coil, the galvanometer indicates:

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No current in circuit

An increasing current

A decreasing current

Either B or C

The work done by a force, keeping an object in circular motion with constant speed is:

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Zero J

1 J

0.1 J

0.01 J

Work-energy principle states that work done on the body by applied force is equal to change in:

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Potential energy

Kinetic nergy

Linear momentum

None of these

A typical rocket ejects the burnt gases at speeds over

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400 ms^-1

40000m s^-1

40000 ms^-1

60000 ms^-1

The waves which propagate by the collision of material particles are known as

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e.m. waves

mechanical waves

light waves

microwaves

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

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Clausius statement of second law

Kelvin'sstatement of second law

Clausius statement of first law

Kelvin's statement of first law

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

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Greater than

Less than

Equal to

None of these

Davision and Germer performed experiment to verify

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de-Brogile hypothesis

theory of relativity

Newton's law of gravitation

Mass-energy relation

Direction of angular momentum is determined by:

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Right hand rule

Head to tail rule

Left hand rule

None of them

Photoelectric effect takes place with a photon of:

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Very high energy

Very low energy

Low energy

High energy

None of these

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