Question # 1

The reciprocal of decay constant λ of a radioactive material is:

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Frequency

Half life

Year

Mean life

None of these

The natural frequency of a pendulum which is vibrating freely, depends upon its

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mass

length

material

all of them

The work done in moving a body between two points in a conservative field is independent of the

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Direction

Force applied

Path followed by the body

Power

If current through conductor is 1 A and length of conductor is 1m placed at right angle to the magnetic field, then the strength of magnetic field is

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F = B²

F = 0

F = B

F = B/2

A particle moving uniformly along circle its projection along diameter performs

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Linear motion

Projectile motion

SHM

Rotatory motion

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

Fringe width will remain unchanged

Fringe will become less intense

The electrons in the outermost shell of an atom are called

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core electrons

valence electrons

high energy electrons

none of them

When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to:

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Zero

Its average velocity

Its angular displacement

None of these

If an amount of heat enters the system it could

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decrease the internal energy

not change the internal energy

increase the internal energy

none of them

While describing the motion of a simple pendulum, the frictional effects are

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taken into account

completely ignored

partially ignored

none of them

The induced current in a conductor depends upon:

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both A and B

None of these

If it is assumed that a frictional force f is present, during the downward motion their

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mgh - f = 1/2 mV²

2mgh - f = 1/2 mV²

mgh - f = 1/2 mV²

None of these

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters,then its retardation should be

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20 ms^-2

10 ms^-2

2 ms^-2

1 ms^-2

Newton's third law says, that the action and reactions are

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Equal but in the same direction

Equal but in opposite direction

May be unequal but in the same direction

May be unequal but in opposite direction

When refractive index of core is 1.50 and of 1.48 of cadding then find the angle of entry for an optical fibre is

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11.2^o

14.2^o

15.4^o

13.6^o

Bernoulli s equation is the basis of law of conservation of

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Energy

Mass

Charge

Momentum

The concept of entropy was introduced in the thermodynamics by

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kelvin

Clausius

Carnot

None of these

Velocity is a physical quantity which is

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Scalar quantity

Vector quantity

Variable quantity

None of these

Crystalline solids are in the form of:

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Metals

Ionic compounds

Ceramics

Both A and B

All of these

Acceleration means the speed of the body is

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Increasing

Decreasing

Just stop

None of these

How many the multiplications of vectors are ?

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Three

Two

One

None of these

The work done in placing a charge of 8 x 10^-18C on a condenser of capacity 100 μ F is

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32 x 10^-32 j

16 x 10^-32j

3.1 x 10^-26j

4 x 10^-10j

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