Question # 1

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

An angle of 180° in circular motion is equivalent to ______ in SHM.

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Half the vibration

One vibration

3/4th of a vibration

None of these

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

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Negative

Positive

Infinite

Zero

Peak value of alternative current is:

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one of its Instantaneous value

Equal to its RMS value

The same as its peak-to-peak value

Both (B) and (C)

None of these

A signal is amplified at the output without any change of phase, if it is applied at the

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inverting input

non-inverting input

at any of the input

none of these

In case of the three dimensional deformation, when volume is involved, the ratio of applied stress to volumetric strain is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

When a body moves against the force of friction on a horizontal plane, the work done by the body is:

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Positive

Negative

Zero

None of these

In order to produce pair production, a photon must have a energy

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0.511 Me v

0.256 Me v

1.02 Me v

0.956 Me v

The instantaneous acceleration of a body moving with constant speed in a circle:

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Remains constant

Is called centripetal acceleration

Tangential acceleration

None of these

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is

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0.05 m

0.08 cm

0.8 m

0.008 m

The product of force and time is called change in:

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Momentum

Impulse

Force

Both a and b

The value of g on the moon whose diameter is 1/4 that of earth is 1/6 of that of earth.The ratio of escape velocities at moon and earth's surface is nearly:

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1 : 5

1 : 1

2 : 5

5 : 1

Which of the following have same SI units

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Force

Impulse

Momentum

b and c

The sky appears blue because

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Red light is absorbed

Blue light is scattered the most

Blue light is absorbed

It is its natural color

A stress which decreases the stress along one dimension is known as:

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Compressive stress

Tensile stress

Linear stress

Both (B) and (C)

Crystalline solid do not show

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Sharp melting points

Flat faces

Long range order

Isotropic expansion coefficients

A spectrum which contains all wavelengths without any break is called

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Emission spectrum

Line spectrum

Continuous emission spectrum

All of them

A particle is moving in a circle with uniform speed v.In moving from a point to another diametrically opposite point.

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The momentum changes by mv

The momentum changes by 2mv

The kinetic energy changes by (1/2) mv²

The kinetic energy changes by mv²

The length of the standard metre measured by Michelsion's interferometer comes out to be

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1,553, 163.5 wavelength

1553.5 wavelength

155316.5 wavelength

none of them

Acceleration is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

A cold soft drink is kept on the balance.When the cap is opened then the weight

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Increases

Decreases

First increases then decreases

Remains same

A bullet of mass 10 g hits a target and penetrates 2 cm into it.If the average friction offered by the target is 100 N,then the velocity with which the bullet hits the target is

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10 ms^-1

1052 ms^-1

20 ms^-1

20√2 ms^-1

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