Question # 1

The consumption source if energy is:

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Energy from blomass

Hydroelectric energy

Geothermal energy

None of these

The number of isotopes of hydrogen are

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2

1

3

4

Op-amp has been discussed as comparator of:

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Distances

Voltages

Velocities

Magnetic fields

Both (A) and (C)

The length contraction happens only

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Opposite to the direction of motion

along the direction of motion

perpendicular to the direction of motion

In any direction

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice

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Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

Wien's constant is measured in:

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Metre per kelviin

Metre kelvin

Kelvin per meter

Joules

Dynes

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

Electron volt is the unit of.

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Potential difference

Energy

Resistance

Capacitance

A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when

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The coil is distorted

The coil is rotated

The coil is neither distorted nor rotated

Both A and B

None of these

Energy is dissipated and consequently the energy mass system do not oscillate indefinitely because of

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very small energy

very large energy

frictional forces

acceleration due to gravity

If the error in the measurement of radius of a sphere is 1% then the error in the measurement of volume will be

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1.1%

3%

5%

8%

In the self-cross product the angle is

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0°

45°

90°

180°

What is the bulk modulus of a material?

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strain/volumetric strain

volumetric stress/strain

stress/volumetric strain

volumetric stress/volumetric strain

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity:

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Fringe width will decrease

Fringe width will increase

Fringe width will remain unchanged

Fringe will become less intense

If the vibrations of the light wave are confined to one plane only, then this light is called

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unpolarized ligth

polarized light

sunlight

none of them

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of the incident light

Temperature of the surface

All of above

A polarizer is used to

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Reduced intensity of light

Produce polarized light

Increase intensity of light

Produce unpolarised light

The magnitude of velocity at any instant is

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The original source of Wind energy is

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Tides

Waves

Sun

Moon

The study of atomic structure of crystals by X-rays was initiated by W.H.. Bragg and W.L. Bragg in

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1920

1926

1910

1914

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