Question # 1

In the Geiger Marsden experiment a narrow beam of alpha particles was fired at a thin piece of Gold foil in a vacuum Some of the particles were scattered though large angles The result of the experiment provided evidence for the existence of.

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A very small charged nucleus

electrons orbiting the nucleus

Neutrons in the nucleus

Nuclear reaction

A body of mass 2 kg is suspended from the celling of an elevator moving up with an acceleration 'g' its apparent weight in the elevator will be.

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9.88 N

19.8 N

29.4 N

39. 2 N

What is used in an electric circuit to allow current in one direction only.

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A fuse

An ammeter

A diode

A relay

A bi convex lens of a material of refractive index 1.5 has the radius of curvature of each side equal to 50 cm the power of the lens will be.

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0.5 dipotre

1.0 dioptre

1.5 diopter

2.0dioptre

What are the dimensions of coefficient of velocity of

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[MLT-1]

[ML-1T-1]

[ML-2T-1]

[MLT-2]

When stationary waves are formed in a closed organ pipe.

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A node is formed at the closed end of the pipe

An antinode is formed at the closed end of the pipe

Each particle at the node experience zero acceleration

The maximum pressure occurs at the nodes

The velocity of sound will be greater in.

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Air

Water

Solids

Vacuum

The object of a telescope is very large this is to have an image which is.

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More magnified

Of better resolution

More bright

More clear

Which quantity must be the same for two bodies if they are to be in thermal equilibrium.

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Internal energy

P.E

Temperature

Mass

The path of Gama rays in Wilson cloud chamber is

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Irregular

Dense and straight

Thin and continuous

Thin and discontinuous

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

The length of Galilean telescope is given by

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fo + fe

fo- fe

1/fo - 1/fe

1/fo = 1/fe

An ideal voltage source has zero.

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Current

Electromotive force

Voltage

Internal resistance

The angle subtended at the centre of a circle by an arc equal to its radius is equal to.

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One rotation

One radian

One degree

One revolution

The total energy of an electron in an orbit around the nucleus is.

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Zero

Unity

Infinity

Negative

Capacitance is directly proportional to

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Distance between the plates

Di electric strength

Area of the plates

Charge multiplied by the applied voltage

The distance between any two consecutive bright or dark fringes is called.

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Wavelength

Amplitude

Fringe spacing

Wavelet

Which of the following quantity is zero about the centre of mass of baody.

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Mass

Acceleration

Moment

Angular momentum

A pair of point charges with equal magnitude and opposite sign separated by a distance 'r' produce.

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Electric dipole

Electric charge

Electric field

electric arc

What is the cause of mirage in desert areas.

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Refractive index of atmosphere increases with height

Refractive index of atmosphere decreases with height

Refractive index of atmosphere remains constant

Scattering

The amount of charge which can be placed on a conductor does not depend on.

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The dielectric strength of the surrounding medium.

Its capacitance

Its potential

Its size or shape

Ebers-Moll model describes the working of a

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BJT

FET

MOSFET

UJT

The sensitivity of the galvanometer can be increased by increasing the

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Number of turns of the coil

Area of the coil

Strength of the magnetic field

All of the above

On which characteristics the loudness of sound pends upon.

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Pitch

Speed

Wavelength

Amplitude

At the temperature of -273 ^oC. pressure of a gas at constant volume becomes zero This specific temperature is called.

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Freezing point

Critical temperature

Absolute zero

Terminal point

The long distance transmission of electrical energy is done at.

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High potential and low current

High potential and highs current

Low potential and high current

Low potential and low current

Which of the following describes that the time interval between two events may be different in different of references

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Simullaneously

Time dilation

Length contraction

Mass variation

Which are the two basic properties of a vector.

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Curvature and direction

Magnitude and direction

Magnitude and sign

Curvature and sign

What is the triple point of water.

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273 .15 K

0 K

100 K

0 oC

In which of the following studies x-rays are not helpful.

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Crystal structure

Crystal surface

Crystal symmetry

Crystal atoms

When a ray of light enters from rarer medium to a denser medium its wavelength.

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Increases

Decreases

Remain constant

Vanishes

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