Question # 1

Bohr's atomic model assumes

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Nucleus is of infinite mass and is at rest

electron in a quantized orbit will not radiate energy

Mass of electron remains the same

All of the above

A water wave is an example of

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Electromagnetic wave

Longitudinal wave

Transverse wave

Reverberation

A gama ray of energy 1900 MeV is absorbed by

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Proton antiproton pair

Electron positron pair

Producing heat in the substance

The orbit

When of the following colours scatters minimum.

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Blue

Violet

Yellow

Red

A lens whose thickness is small as compared to focal length is a

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Concave lens

Double concave lens

Convex lens

Plano concave lens

A physical quantity which produces rotation in a body is called.

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Force

Torque

Momentum

accelerate

What is the effect of electric and magnetic fields on X-rays

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X-rays are deflected

X-rays are not deflected

X-rays are sometimes deflected and sometimes not

Nothing can be said

Liquids with disordered structure frozen in are an example of

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Amorphous solids

Glassy solids

Crystalline solids

Polymeric molecules

The change in wavelength of an X-ray when scattered from an electron is called.

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Compton shift

Doppler shift

Stefan's law

Fraunhofer lines

If a resistance is connected in parallel with a galvanometer the resulting instrument is called.

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A voltmeter

An ammeter

A wattmeter

A potentiometer

On which of the following the kinetic theory of gases is not applicable.

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Water vapour

Smoke particles

Bound particles

Free electrons

If the temperature of the source and sink are increased by same amount the efficiency of the engine.

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Increases

Decreases

Remains unchanged

May increases of decrease

Two vectors of magnitudes 5 N and 7 N respectively are acting on a body if the angle between them is a right angle, their resultant vector will be.

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2 N

4 N

6 N

8 N

When using the formula E = h lambda what unit should energy have.

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Joule

Watt second

Newton metre

Electron volt

X-rays travels ins straight line with velocity

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Less than light

Greater than light

Equal to light

Equal to sound

When two identical travelling waves are superposed, velocity of the resultant wave

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Remains unchanged

Decreases

Increases

Become zero

The specific heat of an ideal gas values as

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To

T1

T2

T3

If air is replaced by any other dielectric medium, the force between two charges.

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Decreases

Increases

Remain the same

Becomes infinity

Who discovered a phenomenon of thermos electricity.

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Peltier

Joule

Seeback

thomson

Which of the following properties of light does not very with the nature of the medium.

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Amplitude

Frequency

Wavelength

Time period

At which temperature surface tension of liquid will be maximum

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0 ^oC

20 ^oC

30 ^oC

100 ^oC

The gas thermometer is taken as the primary standard because.

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Thermometers are easily reproducible

Readings can be accurately taken

No correction are necessary

It produces he thermodynamic scale

A expression for total work done by the battery to move charge against an induced emf is equal to.

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W = LI2

W = 1/2 LI

W = 1/2 L3I

W = 1/2 LI2

Two convex lenses of equal focal length 'f' are placed in contact, the resultant focal length is

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Zero

1

2f

f/2

Identify the irreversible process

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Explosion of a bomb

Slow expansion of a gas

Slow compression of a gas

Slow compression of an eleastic spring

X-ray are

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Streams of negatively charted particles.

Electromagnetic wave

Streams of positively charged particles

Visible light

The material of an electromagnet should have high

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Permeability

susceptibility

Retentivity

Hysteresis loss

What is the focal length of a normal eye lens.

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1 mm

2 cm

25 cm

1 m

Particle which can be added to the nucleus of an atom with changing its chemical properties are called.

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Electrons

Protons

Neutrons

Alpha particles

Viscosity will be maximum when

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Water is at 20 ^oC

Honey is at 20 ^oC

Water is at 100 ^oC

Milk is at 100 ^oC

A hydrometer floats to a particular level in sea water in fresh water it.

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Floats lower

Sinks completely

Floats higher

Floats at the same level

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