Question # 1

A body is termed as perfectly elastic if.

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It can move freely

Its surface is perfectly somooth

It is not affected by an external force

It recovers the original shape when the deforming force is remover

Due to which phenomenon, diamond shrines so brightly.

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Scattering of light

Refraction of light

Dispersion of light

Total internal reflection

The unit of electrochemical potential is.

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J mol-1

volt

J C-1

Mol J-1

If a charged body is moved against the electric field it will gain.

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P.E

K.E.

Electrical P.E.

Gravitational energy

What is the minimum number of thermodynamic parameters required to specify the state of gas system.

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1

2

3

Infinite

Lines of force are imaginary lines drawn so as to be energy point.

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parallel to equipotential surface

Normal to the electric field

Indicative of the position of the nearest source charge

Tangent to the electric field

Transistor are made from

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Plastics

Metals

Insulators

Doped semiconductors

Intensity of the dark bands in interference pattern becomes zero when two waves.

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Of light are monochromatic

Are of the same frequency

Are of the same amplitude

Travel in opposite direction

Which of the following is not SI base unit.

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kilogram

Ampere

Coulomb

Mole

When temperature increases, frequency of an organ pipe

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Decreases

Increases

Remain the same

Become zero

When the angel of incidence becomes larger than the critical angle no refraction occurs This is known is.

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Diffraction

Refraction

Total internal reflection

Diffuse reflection

The SI unit of radioactivity is.

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Becquerl

Curie

Joule

rutherford

On average there is no energy transfer in.

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Sound waves

Water waves

Standing waves

Mechanical waves

The power of a convex lens is 5 D at what distance the object should be placed from the lens so that its real and 2 times larger image is formed.

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25 cm

30 cm

35 cm

40 cm

Which of the following is required for maintaining sustained chain reaction.

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Neutrons

Protons

Electrons

Photons

A direct vision spectroscope is better than a prism spectrometer because it helps in

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Observing the spectrum without a source

Observing the spectrum perpendicular to a source

Observing the spectrum in line with the source

all of the above

Blood is

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A compressible fluid

an incompressible fluid

Non viscous fluid

Not a fluid

A pure capacitor is connected in an AC circuit The power factor of the circuit will be.

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Unity

Infinity

0.5

Zero

In an accelerated or non - inertial frame of reference the weight of the body depends upon.

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Acceleration of the frame of reference

Velocity of the body

Momentum of the body

Velocity of the frame of reference

Super conductor are used in

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Fast computer chips

Magnetic resonance imaging

Magnetic levitation trains

All of the above

In de Brogile model electron orbit must form

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Spectrum

Wave packets

Franhoffer lines

Clouds

Two simple pendulums of the same length but having different masses

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Have different frequencies

Will have period proportional to their masses

Will have periods independent of their length

Have the same period

The number of electrons in U nucleus are.

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92

235

zero

143

Which of the following SI units is not named after any physicist.

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Hertz

Joule

Volt

Candala

When white light is incident on a diffraction grating, the light that will eb deviated from central image will be.

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White

Yellow

Red

Blue

Photo diodes are used as

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Optical fibre receivers

Automatic switching

Logic circuits

All of the above

An operational amplifier can be used as a

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Comparator

Night switch

Inverting and non inverting amplifier

All of the above

A diode cn be used as

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Amplifier

Rectifier

Oscillator

Transistor

In free expansion of a gas. the internal energy of the system.

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Increases

Descreases

Remain unchanged

Becomes infinite

To reduce spherical aberration in optical instruments which of the following should be used.

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Plano convex lenses

Concave lenses

Spherical mirrors

Plane mirrors

The number of molecules or atoms in a specific volume of a gas is independent of their

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Volume

Pressure

Size

Temperature

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