Question # 1

When a nucleus emits an alpha particle, it atomic mass decreased by

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2

1

4

3

Which of the following is a state variable

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entropy

pressure

volume

all of them

Energy stored in the spring of a watch is called

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Potential energy

Kinetic energy

Nuclear energy

Elastic potential

Work done on a body by gravity in lifting it up to certain height is

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Maximum

Minimum

Zero

Negative

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

Which of the following medium/media can transmit both transverse and longitudinal waves:

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Solids

Liquids

Gases

All of them

Fluid friction is _____ the friction between two solid surfaces:

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Greater than

Smaller than

Equal to

None of these

If an iron ball and a wooden ball of the same radius was released from a height 'h' in vacuum, then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

The band above the valence band is called

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high energy band

conduction band

empty band

none of them

1 gm-cm^-3is equal to:

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10³kg-m^-3

10^-3kg-m^-3

1 kg-m^-3

10⁶kg-m^-1

Satellites are held in orbits around Earth by its:

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Gravitational field

Magnetic field

Own orbital motion

Own spin motion

If the velocity of the body decreases non-uniformly, then the slope of the velocity-time graph will have

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different values

same values

zero value

constant valve

The base of equation of continuity is on the

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First law of motion

Law of conservation of mass

Law of conservation of charge

Law of conservation of momentum

Laws of motion are not valid in a system which is

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inertial

non-inertial

at rest

moving with uniform velocity

On heating, glass gradually softens into a paste-like state before it becomes a very viscous liquid at almost

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600°C

7600°C

800°C

900°C

If the distance of a surface from light source is doubled,then the luminance will become

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1/4 times

1/2 times

2 times

4 times

If a force acts on a body whose action line does not pass through its centre of gravity.then the body will experience

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Angular acceleration

Linear acceleration

No acceleration

None of these

The original source of tides is

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Ocean

Sun

Earth

Moon

The resultant of two equal forces is double of either of the forces. The angle between them is

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120°

90°

60°

180°

A longitudinal sinusoidal wave has wavelength of 1cm and a period of 2sec. Its wavevelocity is:

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50 cm/ sec

0.5 cm/ sec

5 m/ s

0.005 m/ sec

The components of a fibre optic communication system is/are

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At transmitter

An optical fibre

Receiver

All of these

The self product of two vectors in cross product is

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Zero

Square of vector

Only same vector

None of these

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