Question # 1

Who suggested that energy is radiated or absorbed in discrete packers called quanta.

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Max. Planck

Stefan

Lummer

Boltzmann

Which of the following gives discrete emission spectrum.

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Sun

Candle

Incandescent filament

Mercury vapour lamp

A person suffering from short sighted ness uses

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Concave lens

Convex mirror

Convex lens

Concave mirror

The SI unit of equivalent dose is

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Seivert

Gray

Radian

Rem

Which term is used for human eye deflect near sightedness.

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Myopia

Hypermetropia

Presbyopia

Calaract

The pressure necessary to liquify a gas at the critical temperature is called.

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Normal pressure

Atmospheric pressure

Critical pressure

Liquid pressure

Which particles have spin quantum number 1/2

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Mesons

Laptons

Hadrons

Muons

When a force of 4 N acts on a body of mass 2 kg for a time of 2 s, the rate of change of momentum is.

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2 kg ms -1

4 kg ms-1

8 kg m s-1

16 kg m s-1

Which of the following are defects is lenses.

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Chromatic aberration

Spherical aberration

Astigmation

All of the above

A Carnot engine can be 100% efficient of the sink is at.

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0 k

0 oF

0 oC

273 K

Diffusion of gases occurs because the molecules of the

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Gas present in a higher concentration exerts a high pressure

Gases are different

Gasses attract each other

Gasses over about randomly

If the wave length of a wire is 1 cm and its period is 0.02 s, the velocity of the wave will be

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20 cm s-1

50 cm s-1

60 cm s-1

100 cm s-1

The concept of entropy was introduced by

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Saadi Carnot

Boyle

Charles

Rudolph Celsius

In a Nuclear reactor which material is often used as modeerator.

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Water

Graphite

Uranium

Water and graphite

The tunnel effect makes possible

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Alpha decay

Gama rays

Positive Beta decay

negative Beta dacay

The direction of induced emf during electromagnetic induction can be determined by making use of.

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Faraday's law

Ampere;s law

Lenz's law

Laplace law

Beats are the result of.

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Interference

Doppler's effect

Ultrasound

Polarization

The phenomenon in which a photon of frequency 'f' is scattered by an electron and the scattered photon has frequency f <f is known as.

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Pair production

Pair annihilations

Photoelectric effect

Compton's effect

Tesla is the unit for measuirng

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Magnetic intensity

Magnetic induction

Magnetic moment

Electric potential

Which of the following pair does not have identical dimensions.

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Energy and torque

Momentum and impulse

Mass and moment of inertia

Energy and work

When amplitude of a wave becomes double its energy becomes.

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Xero

Double

4 times

6 times

The field in which the work done is independent of the path followed.

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Conservative field

Electric field

Magnetic field

Non conservative field

Any frequency higher than the fundamental frequency of a sound is known as.

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Overtone

Beat

Acoustics

Shockwaves

Compton's effect was presented in.

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1921

1923

1931

1933

The rectangular coil in galvanometer is made up of.

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Bare copper wire

Insulated aluminum wire

Enameled copper wire

Enameled steel wire

What units are used to rate electrical fuses.

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Volts

Ampere

Watts

Hertz

Which equation in electromagnetism describe the magnetic field B generated by an electric current.

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ampere's circuital law

Bio savart law

Gauss's law for electromagnetism

Coulomb's law

A pencil dipped partially into water appears bent because of.

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Reflection of water surface

Diffraction of water surface

Refraction of water surface

Water is a fluid

In which of the following eddy current is not used

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Induction furnace

Automobile speedometer

Electromagnetic damping

X- rays diffraction

If the pressure of a gas is doubled, then its thermal conductivity will

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Increases

Decreases

Remain constant

Be zero

Alpha particles emitted from a radioactive material are.

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He nucliei

H -nucliei

Li nucliei

B nucliei

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