Question # 1

A toy car moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed V of the car is:

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38 m/sec

3.8 m/sec

0.6 m/sec

None of these

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

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Energy only

Momentum only

Mass only

Charge only

Both (A) and (B)

The current in microamperes required to produce one millimeter deflection on a scale placed one meter away from the mirror of the galvanometer, defined the sensitivity of

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ammeter

voltmeter

galvanometer

avo-meter

Huygen principle is used to determine:

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Speed of light

Location of wavefront

About polarized or unpolarized light

None of them

41 The force experience, when proton projected in a magnetic field with velocity 'v' is

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+e(v x B)

-C(V x B)

+e²(v x B)

-e(v²x B)

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

Surface density of charge is defined as

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Charge per unit volume

Charge per unit length

Charge per unit area

Charge per unit mass

If the distance between two charges is doubled, the force between them will become

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Double

Half

Three times

One fourth

One third

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

The dot product of electric field intensity E and vector area A is called

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Electric potential

Electric flux

Electric field

Magnetic field

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, infrared rays, micro waves

Visible light, gamma rays, radio waves

SI unit of temperature

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Centigrade

Celsius

Kelvin

All of these

Study of fluid properties in motion is

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Dynamics

Fluid statics

Fluid dynamics

None

Keeping in view the Earth surface the value of g on the equator is

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Zero

Minimum

Maximum

None of these

The practical use of services by optic fiber is

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Two way television

World processing

Image transmitting and receiving equipment

All of these

The more general form of second law of motion is

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F = ma

F x t = mV_f- mV_i

Both

None of these

In projectile motion when a body is projected upward it must have

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Initial velocity

Angle θ < 90^o

Falling under gravity

All of these

Which of the following types of optical fibre has a very thin core of about 5μm diameter and has a relatively large cladding?

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single mode step index fibre

multi-mode step index fibre

multi-mode graded index fibre

none of them

Satellites are held in orbits by gravitational pull by Earth and are put into orbit by

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Initial velocity

Rockets

Escape velocity

None of these

A train us moving with a velocity of 25 m/s and a car is moving behind it by a velocity of 8 m/s in same direction The relative velocity of train with respect to car is

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17 m/s

33 m/s

17.5 m/s

None

Period of visible light waves is

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2 × 10^-10 sec

2 × 10^-11 sec

2 × 10^-14 sec

2 × 10^-15 sec

Which force is the medium independent force ?

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Electrostatic force

Nuclear force

Gravitational force

All of them

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