Question # 1

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

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1/R

1/R²

R

R²

The mechanics, which deals with the objects moving with velocities approaching that of light is called:

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Relativistic mechanics

Wave mechanic

Quantum mechanics

Statics

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

The distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

none of these

Braking radiation causes:

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Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

Tick the one which is not polymer solid:

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Zirconia

Polythene

Nylon

Synthetic rubber

None of these

A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which force makes with the direction of motion of a body is:

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0°

30°

60°

90°

If the instantaneous velocity of a body does not change. the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

A body of mass 0.031 kg attached to one end of a spring of spring constant 0.3 N/m, then time period of spring mass system will be:

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1.5 sec

2.0 sec

2.3 sec

2.5 sec

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

The greatest stress that a material can endure without losing the proportionality between stress and strain is called

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plastic line

breaking point

proportional limit

none of them

A substance containing equal no. of opposite charges separated by a small distance is known as

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Super conductor

LED

Dipole

Insulator

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

Which one is the case when the wavelength is actually changed?

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When source move relative to observer

When observer move relative to source

When observer moves around a stationary source at the center of circle

When the relative displacement between source and observer is zero

What is the bulk modulus of a material?

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strain/volumetric strain

volumetric stress/strain

stress/volumetric strain

volumetric stress/volumetric strain

The original source of Wind energy is

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Tides

Waves

Sun

Moon

One a clear day at noon, the intensity of the solar energy reaching the Earth surface is about

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1 KWm^-1

2 KWm^-2

3 KWm^-2

None of these

A body is in complete equilibrium when

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ΣF = 0

Στ = 0

SF = 0 and Στ = 0

None of these

The relation for time of flight is

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The high blood pressure is known as

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Diastolic

Systolic

High blood pressure

None of these

If the thickness of the film and angle of incidence are such that two reflected waves cancel each other the film will look

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Dark

Bright

May be partly bright

None of these

Two wires of the same material have diameters in the ration 2 : 1 if they are stretched by the same force their elongations will be in the ratio

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8 : 1

1 : 8

2 : 1

1 : 4

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