Question # 1

The distance covered by a body in unit time is called.

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Displacement

speed

Velocity

Both B and C

When a charged particle passes through matter, it produces ionization, this effect is used in

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fission reaction

reactor

radiation detector

fusion reaction

There are some whose resistivity becomes zero below a certain temperature, called

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absolute zero

0°C

critical temperature

lower fixed point

Which of the following is not an example of intertial frame

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a body placed on the surface of earth

a body placed in a car moving with uniform velocity

a body placed in a car moving with same acceleration

none of these

Density is defined as:

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Mass per volume

Volume per mass

Mass X volume

Mass per length

The resistivity of a substance depends upon the

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length

mass

area

temperature

If a car rest acceleration uniformly to a speed of 144 km/h in 20 s it covers a distance of

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20 m

400 m

1440 m

2880 m

Strictly speaking, the earth is:

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An accelerated frame of reference

A non-inertial frame of reference

An inertial frame of reference

^{A non-accelerated frame of reference}

Both (A) and (B)

Which quantity has different dimensions:

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Work

Pressure

Energy

Torque

What must be changing when a body is accelerating uniformly?

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the force acting on a body

the velocity of the body

the mass of the body

the speed of the body

When a body moves with a constant speed in a circle:

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No work is done on it

No acceleration is produced in the body

Velocity remains constant

None of these

The first law of thermodynamics defined as

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Conversion of heat energy into mechanical energy

Conversion of heat energy into vibrational energy

Conversion of heat energy into translational energy

All of these

A line which represents the direction of travel of a wave is known as

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Wave front

Locus

Ray of light

Either b and c

In deformation of the material, the potential energy of the molecules due to displacement from their mean positions is

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Lost

Gained

No lost no gain

None of these

A body of mass M kg is lifted by a man to a height of one metre in 30 s. Another man lifts the same mass to the same height in 60 s.The work done by them is in ratio

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1 : 2

1 : 1

2 : 1

4 : 1

Colours seen on oily water surface by the incident white light is due to

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Diffraction

Interference

Refraction

Reflection

Every streamline can

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Not cross each other

Cross each other

Some what cross each other

None of these

Stokes law is strictly obey by

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Ideal fluid

Real fluid

Both A and B

None of these

S.I. unit of angular velocity of

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Radian per second

Revolution per minute

Degree per second

None of these

The ultimate tensile strength (UTS) can be regarded as the

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Maximum strength of the material

Nominal strength of the material

Minimum strength of the material

None of these

The typical speed of Earth around the sun is

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29700 ms^-1

29600 ms^-1

29500 ms^-1

29400 ms^-1

Which of the following colors suffers maximum deviation in a prism?

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Yellow

Blue

Green

Orange

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