Question # 1

If force and displacement are in opposite direction, the work done is taken as

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Positive work

Negative work

Zero work

Infinite work

At absolute temperature, the kinetic energy of the molecules

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Becomes zero

Becomes maximum

Becomes minimum

Remain constant

When a mass 'm' is pulled slowly through a distance 'x_o' , the elastic potential energy of the spring would be

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P.E=Kx²_o

P.E= 1/2kx_o

P.E=1/2Kx²_o

P.E=Kx²_o

A diode which can turn its current ON and OFF in nono seconds is called:

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LED

Photodiode

An ordinary diode.

Both (A) and (B)

Both (B) and (C)

The straight current carrying conductor experiences maximum force in a uniform magnetic field when it is placed

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parallel to the field

Perpendicular to the field

At an angle of 45 to the field

None of the above

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

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1/2

More than 1/2

Less than 1/2

Between 1 and 2

Light appears to travel in straight line because

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It is not absorbed by the atmosphere

It is refracted by the atmosphere

Its wavelength is very small

Its velocity is very large

In compressional wave,the layer of medium having reduced pressure is called:

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Compression

Elasticity

Node

Rarefaction

When a vector is multiplied by a negative number, its direction:

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Remains the same

Changes

Changes by 180°

None of these

The equation of continuity

A₁V₁= A₂V₂is for the flow of

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an ideal fluid

an incompressible fluid

a non visconcous fluid

all of the above

When two protons are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

The difference between 1st ring fringe and 1st dark fringe is measured as

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λD/2d

λD/d

λD/4d

2λD/d

The phenomenon of blending of around edges of an obstacle is called:

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Interfarance

Defraction

Polorisation

None of above

The term impulse means, the force applied on a body for

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Permanently

Temporary

Very short interval of time

None of these

The atoms or molecules in a crystalline solid are held together by

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Attractive force

Gravitational force

Cohesive force

Electromagnetic force

A visual representation of an electric field in terms of an electric field lines was proposed by

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Coulomb

Faraday

Gauss

Lenz

A body will be in rotational equilibrium if

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

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Critical temperature

Temperature of vaporization

Melting point

Both A and C

Both A and B

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decrease

The whole structure obtained by the repetition of unit cell is known as

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Unit cell

Crystal lattice

Ore

All of these

Which electromagnetic wave would cause the most significant diffraction effect for an atomic lattice of spacing around 10^-10m?

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microwave

infrared

ultraviolet

X-ray

The electric field due to an infinitely long thin wire at a distance R varies as

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1/R

1/R²

R

R²

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