Question # 1

When the particles of the medium vibrate about their mean position, along the direction of the motion of waves, then the waves are called:

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Longitudinal waves

Transverse waves

Water waves

Complex waves

The CRO deflects the beam of electrons, when they passes through uniform

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electric field

gravitational field

magnetic flax

magnetic field

A photon is considered to have

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Momentum

Energy

Wavelength

All of the above

Direction of motion _________ in circular motion

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Changes off and on

Changes continously

Does not change

None of them

When a conductor moved with its length parallel to the lines of magnetic fled:

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An emf is induced across its ends

Emf induced is similar to that of a battery

Emf passes through the conductor

Both A and B

None of these

The cause of mirage observed in deserts in bright sunlight is due to

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Refraction of light

Reflection of light

Scattering of light

Total internal reflection of light

The surface destiny of charge is defined is:

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Charge per volume

Mass per volume

Charge per area

Mass per area

Both (B) and (C)

If the two charges in Coulomb's law have double distance between them, then electric force

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Becomes two-fold

Becomes four-fold

Remains the same

None of these

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

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70%

100%

35%

38%

Work is a Quantity

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Vector

Scalar

Non-physical

None of these

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

When velocity of moving body is doubled, the quantity which is also doubled is its:

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K.E.

Acceleration

Momentum

P.E.

Which one of the following physical quantities changes with relativistic speed

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Length

Mass

Time

All of the above

Velocity is a

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scalar quantity

vector quantity

constant quantity

none of them

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

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2 : 1

4 : 1

1 : 4

3 : 4

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

dimensions are the same for:

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Work and energy

Force and weight

None of these

Both a and b

A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

The year when A.H. compton was awarded Nobel Prize is:

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1923

1927

1931

1935

None of these

Two forces each of the magnitude F act perpendicular to each other. The angle made by the resultant force with the horizontal will be:

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30°

45°

60°

90°

The number of "Earth stations" which transmit signals to satellites and receive signals from them are:

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3

24

126

200

An electronic computer is basically a vast arrangement of electronic switches which are made from

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Resistors

Transistors

N -type crystals

P-Type crystals

Capacitors

The shell closer to the nucleus is called:

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N shell

L shell

K shell

M shell

O shell

Which of the following is/are example/s if mechanical waves i.e. waves generated in _______:

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Rope

Coil of spring

Water

All of them

In solids, only following type/s of wave can travel:

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Transverse

Longitudinal

Both A and B

None of them

The Space around the Earth within which it exerts a force of attraction on other bodies is known as

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Nuclear field

Conservative field

Electric field

Gravitational field

Coulomb force, when any material medium is placed between two charges

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Increases

Decreases

Remain unchanged

None of these

The L-C parallel circuit the capacitor draws a

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leading current

lagging current

main current

none of these

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

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Refraction

Reflection

Diffraction

Formation of spectrum

The maximum possible error in the reading of an instrument is ______ its least count.

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Half of

Quarter of

Equal to

Double than

According to the special theory of relativity

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mass and energy are same entities

mass and energy are same entities but interconverible

mass and energy are different entities but interconverible

mass and energy are different entities but non-interconveritble

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