Question # 1

When first condition of equilibrium is satisfied the body has

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no linear acceleration

no angular acceleration

rational equilibrium

none of them

Sky seems blue due to

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Diffraction

Polarization

Dispersion

Scattering

When two light waves travelling in the same direction are out of phase at any point, their resultant amplitude

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increases

decreases

remains unchanged

increases rapidly

Sunlight is also partially polarized because of Earth's atmosphere due to scattering by

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Water vapours

Air particles

Dust particles

All of these

Breaking load for units area of cross-section of a wire is called:

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Tensile strength

Ductibility

Yield point

Breaking stress

A body is said to be in a state of complete equilibrium if

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Its translational accelerationis zero

Its rotational acceleration is zero

its rotational as well as translational acceleration is zero

its angular momentum is zero

The efficiency of a particle heat engine:

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can be 100%

Cannot be 100%

Is always zero

None of these

The phenomenon of diffraction can be exhibited by

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Polarized waves only

Un polarized waves only

Longitudinal waves only

All polarized or un polarized waves and longitudinal or transverse waves

As we go above the surface of earth the value of 'g'

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Increase

Remain Constant

Decrease

Increase slightly

The direction of a vector in a space is specified by

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One angle

Two angles

Three angles

Cannot be specified

An optical fiber carries data in the form

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Lights signals

Sound signals

A wave

A particle

If the distance of circular orbit is 384000 km and 1.01 kms^-1 then find its period of one revolutions in days

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20.2 days

22.4 days

21.2 days

27.5 days

The electrical behavior of semiconductor depends on the material purity which is

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Sensitive

Extremely sensitive

Non-sensitive

None of these

The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

For keeping a body in circular motion,the force required is

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Centripetal

Centrifugal

Radial

Tangential

The speed of flying bee is

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1 ms^-1

5 ms^-1

8 ms^-1

10 ms^-1

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor The capacitor of the capacitor:

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Increases

Decreases

Remains unchanged

Becomes infinite

Commercial polarizing material is

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Colour glass

Infra red glass

Polaroid glass

None of these

The limit up to which the stress is directly proportional to strain is called

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Elastic limit

Proportional limit

Breaking limit

Ultimate tensile limit

The temperature scale approved in SI units is:

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Calslus scale

Kelvin scale

Fehrenhelt scale

None of these

At points where the crest (or trough) of one wave coincides with the crest (or trough) of the other wave, the wave produces

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destructive interference

constructive interference

diffraction

dispersion

Which of the following is not measured in units of energy

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Couple (angle turned through)

Moment of inertia (angular velocity)²

Force (distance)

Force (time)

Moment of inertia of a solid disc or cylinder is

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mr²

1/2 mr²

1/3 mr²

1/4 mr²

If the slits in YDS experiment are made closer, fringe spacing will:

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Increase

Decrease

Remain same

None of above

In semiconductors, the valence band at room temperature is

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Completely filled

Partially filled

Empty

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

The product of force times the perpendicular distance between some point and the line of action of the force is

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The moment of inertia action on it

The moment of force about the chosen point

The angular momentum of the body

None of these

To cover the whole of the populated Earth surface, there required the correctly positioned satellite at the longitude of

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60^o

120^o

180^o

45^o

Reduce the given number up to three significant figures 64.6546

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64.6

64.7

64.66

64.65

The body is in a state equilibrium when it is

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At rest

In motion

In rotation

None of these

Newtons laws are empirical laws, deduced from

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Theories

Experiments

Facts

None of these

The deformation measured in terms of some twisting angle due to action of stress is known as

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Stress

Linear stress

Compressive stress

Shear stress

The correct statement about poissons ratio is

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Its unit is N/m²

It is dimensionless

Its unit is Newton

Its dimensions MLT²

The momentum of a body is p and its kinetic energy is E its momentum become 2p its kinetic energy will be

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E/2

3E

2E

4E

For the same kinetic energy,the momentum is maximum for:

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An electron

A proton

A deuteron

An a particle

Which of the following is the smallest unit?

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Millimeter

Angstrom

Fermi

Metre

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

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Elasticity

Elastic force

Stress

Strain

The term torque is synonymous with

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Moment of force

Moment of inertia

Angular momentum

Pressure

Radian is an angle which is

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Solid angle

Plane angle

Angle

None of these

The unit of coefficient of viscosity is

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kgm^-1s^-1

Nsm^-2

Poise

All of these

The typical speed of human running is

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1 ms^-1

2 ms^-1

4 ms^-1

5 ms^-1

First law of thermodynamics is merely a statement of law of conversation of:

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Energy

Angular momentum

Change

Linear momentum

Is it possible to add a vector quantity to a scalar quantity ?

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No

Yes

Never

None of these