Question # 1

The velocity of a body at any instant of its motion is known as

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average velocity

instantaneous velocity

uniform velocity

none of them

The current that flows through the coil of a motor causes:

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Its shaft to revolve

Its brushes to rotate

Motor to move

Its shafts to rotate

None of these

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

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Newton's second law

Pascal's law

Carnot theorem

Second law of thermodynamics

Rutherford performed an experiment on nuclear reactions in:

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1718 A.D

1818 A.D

1918 A.D

2001 A.D.

1701 A.D.

Which one of the following elasticizes is possessed by fluids:

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Young's elastic modulus (length)

Bulk elastic modulus (volume)

Modulus of rigidity (shape)

None of these

The value of threshold frequency for different metals is

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different

same

may be different or may be same

none of these

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

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2.120°A

0.212°A

21.2°A

0.14°

a

A conducting wire is drawn to double its length. Final resistivity of the material will be

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Double of the original one

Half of the original one

One fourth of the original one

Same as original one

A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be

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64 W

80 W

100 W

125 W

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

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

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600°C

7600°C

800°C

900°C

Absolute zero is considered as that temperature at which:

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All liquid become gases

All gases become liquid

Water freezes

None of these

The gavanometer constant of a moving coil galvanometer is given by

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K=BAN/C

K=BN/CA

K=NAC/B

K=C/BAN

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

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a reversible process

an irreversible process

any one of them

both of them

A potential barrier of 0.7V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

Practically the quantity v/c is always:

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less than one

Equal to one

Greater then one

all of these

None of these

A heat engine is that which converts

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mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluids

None of these

The electrical forces between the molecules of a liquid are

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Repulsive

Attractive

Both A and B

None

One torr is equal to

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13.33 N/m²

760 N/m²

760 mm Hg

133.3 N/m²

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

Example of progressive wave is

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transverse waves

longitudinal waves

both of them

none of them

The highest value reached by the voltage or current:

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In quarter cycle is called Instantaneous value

In half cycle is called peak-to-peak value

In one cycle is called peak value

In half cycle is called Instantaneous value

None of these

The substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

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32°C

-32°C

-40°C

-212°C

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic field

Constant electric field

None of these

The current through a metallic conductor is due to the motion of

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protons

neutrons

electrons

free electrons

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