Question # 1

The image of the tip of a needle is never sharp because of

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Polarization of light

Interference of light

Diffraction of light

Reflection of light

Strength of magnetic field is measured in SI units, in:

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N

N/Am

Am/N

Nm/A

None of these

N s m^-2is unit of:

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Drag force

Pressure

Surface tension

Coefficient of viscosity

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

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zero

small

large

very large

The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:

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Critical temparature

Temperature of vaporization

Melting point

Both (A) and (C)

Both (A) and (B)

Radian is defined as the angle subtended at the center of a circle by an arc of:

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Length equal to its diameter

Length equal to its radius

Any length

None of these

Work is always done on a body when:

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A force acts on it

It moves through certain distance

None of A and B is correct

Both A and B is correct

Which one is related to angular motion:

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Moment of a force

Moment of inertia

Moment of momentum

None of these

At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string of that instant is

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Sinusoidal shape with amplitude A/3

Sinusoidal shape with amplitude A/2

Sinusoidal shape with amplitude A

Straight line

The temperature of gas is produced by

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At potential energy of its molecules

The kinetic energy of its molecules

The attractive force between its molecules

The repulsive force between its molecules

Davision and Germer performed experiment to verify

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de-Brogile hypothesis

theory of relativity

Newton's law of gravitation

Mass-energy relation

What will be efficiency of carnot engine when it is operated between the temperatures 47^oC and 127 ^oC:

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Reversible

Irreversible

Sometimes A and B

None of these

By the slope of velocity time, we can determine the

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Acceleration

Constant velocity

Average velocity

Average acceleration

The focal length of the lens of human eye

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Is fixed

Varies from zero to infinity

Can be increased only

Can be decreased only

In an 𝑎 −decay:

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The parent and daughter nuclei have same number of protons

The daughter nucleus has one proton more than parent nucleus

The daughter nucleus has two protons less than parent nucleus

The daughter nucleus has two neutrons more than parent nucleus

Range of projectile is maximum when thrown at an angel of

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30°

60°

45°

75°

Television signal are converted into light signals by

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Decoder

Transistor

Photodiode

Optical fibre

An ordinary glass gradually softens into a paste-like state before it becomes a very viscous liquid. It happens almost at:

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800°C

500°C

300°C

100°C

None of these

How many main frontiers are of fundamental science ?

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One

Two

Three

None of these

The mass of Uranium atom is

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10^-10 Kg

10^-15 Kg

10^-20 Kg

10^-25 Kg

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The fractional change in volume per unit increase in pressure is called

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Pressure coefficient

Volume coefficient

Bulk modulus

Compressibility

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