Question # 1

A stone is tied to the end of a 20 cm along string is whirled in a horizontal circle.

if centripetal acceleration is 9.8 m/sec², then its angular velocity in rad/sec is:

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22/7

7

14

21

What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10^-2Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

The total reactance of a series RLC circuit at resonance is

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zero

Equal to the resistance

Infinity

Capacitive

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

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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100 J

1.6 x 10^-17J

100 eV

1.6 x 10^-17eV

The dot product of electric field intensity E and vector area A is called

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Electric potential

Electric flux

Electric field

Magnetic field

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

The device in which induced emf is statically induced emf is:

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Transformer

AC generator

Alternator

Dynamo

The value of current at resonance in series LCR circuit is affected by the value

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R only

C only

L only

R, C and L

Back emf is produced due to

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Self induction

Mutual induction

A.C

Lenz's law

A device used to measure the speed of liquid flow is known as

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barometer

speedometer

sphygmomanometer

venture-meter

In projectile motion the vertical acceleration is

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Zero

Maximum

'g'

None of these

Dimension of impulse is same as that of

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Force

Torque

Momentum

Angular momentum

Such a surface on which all the points have the same phase of vibration is known as

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wavefront

amplitude

displacement

all of them

The ability of anybody to return, to its original shape is called

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Elasticity

Elastic force

Stress

Strain

The velocity-time graph is a horizontal straight line when the velocity of the car is

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zero

constant

decreasing

increasing

When the speed of a moving body is doubled

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Its P.E. is doubled

Its acceleration is doubled

Its K.E. is doubled

Momentum is doubled

The SI unit of stress is same as that of.

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Momentum

Pressure

Force

Length

A mass of 5 kg moves with an acceleration of 10m s^-2, the force applied is

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10N

50N

2N

20N

If focal length of objective is increased

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Magnifying power of compound microscope decreased

Magnifying power of astronomical telescope increases

The diameter of the objective lens

None of these

Einsteins theory say that gravity

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Follows inverse square law

Donot follow the inverse square law

Very weakly follow inverse square law

None of these

For constructive interference path difference should be

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Integral multiple of λ/2

Integral multiple of λ

Odd integral multiple of λ

Odd integral multiple of λ/2

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