Question # 1

The doped semi-conductor materials are known as

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intrinsic semi-conductor

extrinsic semi-conductor

either of them

none of them

Crests and troughs are formed in:

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Longitudinal waves

Transverse waves

Both of these

None of these

In an adiabatic expansion, the temperature of the gas

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increases

becomes zero

decreases

decreases rapidly

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

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0°C

10°C

17°C

20°C

A field free region is found:

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Near the outer surface of a hollow charged metal sphere

In the interior of solid metal uncharged sphere

In the interior of solid metal charged sphere

Both (A) and (B)

Both (A) and (C)

An ideal voltmeter has:

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Zero resistance

Small resistance

Large resistance

Infinite resistance

Both A and B

In case of streamed lined flow of liquid, the loss of energy is

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Maximum

Minimum

Infinite

equal to what is in turbulent flow

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

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0.1 V

8 V

2 V

0.5 V

Sadi carnot described an ideal heat engine in

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1820

1840

1860

1880

An intertial frame of reference is a frame of reference which is

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at rest

moving with uniform velocity

either at rest or moving with uniform velocity

none of these

The phase determines the

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displacement

amplitude

frequency

state of motion of vibrating body

The value of g at the surface of moon is

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1.8 ms^-2

1.6 ms^-2

1.9 ms^-2

0.16 ms^-2

For the measurement of temperature of the order of 400°C, we will prefer

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Hg thermometer

Alcohol thermometer

Pyrometer

Thermometer

The constant K in Coulomb's Law depends upon

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Nature of medium

System of units

Intensity of charge

a & b

cream gets separated out of milk when it is churned it is due to

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Gravitational force

Centripetal force

Centrifugal force

Resistance

Can the magnitude of a vector have a negative value ?

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No

Yes

yes in same cases

None of these

The total linear momentum of an isolated system remains

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Constant

Variable

Zero

None of these

A piece of Aluminium (Al) and a piece of Germanium (Ge) are cooled T1 K to T2 K. The resistance of:

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Each of them increases

Each of them decreases

Al increases and Ge decreases

Al decreases and that of Ge increases

The splitting of white light into several colors on passing through a glass prism is due to

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Refraction

Reflection

Interference

Diffraction

According to the Hooke's law the force required to change the length of a wire by '1' is proportional to:

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1^-2

1^-1

1

The acceleration of a body at some particular instant is called

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Initial acceleration

Variable acceleration

Instantaneous acceleration

None of these

Torque is a

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Scalar quantity

Vector quantity

Physical quantity

None of these

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