Question # 1

In thermodynamics, internal energy is the function of

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temperature

pressure

state

none of them

The curie temperature of iron is about

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250°C

500°C

750°C

1000°C

The SI unit of conductivity is

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ohm-m

ohm^-1m^-1

ohm-m^-1

ohm^-1m

The SI unit of magnetic flux is.

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weber

Nm^-1A^-1

tesla

gauss

The current in microamperes required to produce one millimeter deflection on a scale placed one meter away from the mirror of the galvanometer, defined the sensitivity of

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ammeter

voltmeter

galvanometer

avo-meter

A photon is considered to have

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Momentum

Energy

Wavelength

All of the above

The inside cavity of the black body is

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painted white

painted silver

blackened with soot

painted red

In the same medium, velocity of the wave:

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Goes on increasing

Remains constant

Goes on decreasing

None of these

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

A ball is dropped from a height of 4.2 meters. To what height will take it rise if there is no loss of KE after rebounding?

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4.2 m

8.4 m

12.6 m

none of these

Pressure exerted by a gas is

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Independent of density of the gas

Inversely proportional to the density of the gas

Directly proportional to the square of the density of the gas

Directly proportional to the density of the gas

Young's modulus for ice is

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3

14

20

32

A human eye can detect the electromagnetic radiations of the type:

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Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

A ballistic missile is

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Unpowered

Unguided

Both

None of these

If the volume of a gas is to be increased four times then

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Its temperature must be doubled

At constant temperature its pressure must be decreased four times

At constant temperature its pressure must be increased two times

It cannot be increased

If the unit of force and length are increased by four times then the unit of energy is increased by

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2 times

4 times

8 times

16 times

The time rate of change of displacement is called

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Speed

Velocity

Acceleration

None of these

The metals become electrically conducting due to their

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Ductility

Hardness

Structure

All of them

The nature of thermal radiation is similar to:

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Ultraviolet rays

Light rays

Both of them

None of them

Newton's rings are formed due to

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Refraction of light

Diffraction of light

Interference of light

None of these

The certain physical properties of a material are used to construct a temperature scale which varies with temperature

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Linearly

Inversely

Remains constant

None of these

If stress is increased beyond the elastic limit a permanent change in the material is observed This behavior is called

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Elastic deformation

Elasticity

Plasticity

Yield strength

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