Question # 1

Mean free path of gas molecules is inversely proportional to its

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Volume

Pressure

Temperature

Size

The value of power factor in an LCR sense circuit at resonance is.

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Zero

0.5

unity

Infinity

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

Which of the following propagates at the same speed as velocity of light.

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Heat waves

Sound waves

Shock waves

Beta particles

The length of an astronimical telescope for normal vision is.

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fo x fe

fe/fe

fo - fe

fo + fe

The working of the rocket is based on the principle of.

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Electromagnetism

Conservation of momentum

Floatation

Hydraulic system

Efficiency of a half wave recitifier is.

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Almost negigible

More than full wave rectifier

Less than full wave rectifier

Equal to full wave rectifier

Which of the following is an example of negative work.

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a thrown up cricket ball

Grass mower

A car on road

Bucket in the well

A geostationary satellite covers

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100 ^o of longitude

120 ^o of longitude

130 ^o longitude

140 ^o of longitude

Electromagnetic waves transmit.

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Energy only

Momentum only

Energy and momentum

Light

Which of the following is formed by decay of a free neurton.

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A number of electrons

Two protons

A proton and an electron

An alpha particle

Law of increase of entropy is a result of

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First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Zeroth law of thermodynamics

The dimensions of stress are

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[MLT-1]

[ML-1 T]

[ML-1T-1]

[ML-1T-2]

Gases exert pressure on walls of the vessels because gas molecules.

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Possess momentum

Have finite volume

Collide with each other

Obey gas laws

When ever current is drawn from a cell Its terminal potential difference and emf become

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Different

Same

Zero

Negative

In ideal gas equation PV = nRT , R is

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Universal gas constant

Avogadro's number

Plank's constant

Gravitational constant

Which one of the following is not a dimensionless quantity.

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Radian

pi

Decibel

Force

The Compton effect in X-rays proves that

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Electrons have wave property

x-rays have wave properly

X-rays have particle characteristics

Electrons cannot exist

On the ground the gravitational force on a satellite is W What is the gravitational force on the satellite when at height R/50

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0.96 W

0.98 W

1.04 W

1.02 W

Which of the following is not necessary for work to be done.

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A constant force

An applied force

A displacement

Force component along the displacement

The point midway between the lens surface on its participial axis

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Optical centre

Principal focus

Focal plane

Focal length

It is sometimes necessary to protect electrical apparatus from magnetic field This can be done by surrounding the apparatus with a box made from.

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Aluminum

Iron

Steel

Rubber

Which is the correct statement regarding the nature of light.

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It has wave nature

It has particle nature

It has both wave and particle nature at the same time

It has wave nature sometime and particle nature at some other time.

A monochromatic light beam when passed through a prism is.

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Diffracted

Devlated

Polarized

Dispersed

The strength per unit volume of a solid is called.

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shear stress

Shear strain

Bulk strength

Bulk modulus

At what speed the mass of a body will be doubled.

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0.67 C

0.77 C

0.87 C

0.97 C

Which is the heat transfer mode between an object and its environment due to circular fluid motion.

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Conduction

Convection

Radiation

Mass transfer

Alternating current generator consists of a coil and a pair of.

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Split rings

Slip rings

Metal rings

Copper rings

Which of the following is the ideal gas equation.

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PV -n RT

P/V = n RT

V/P = nR/T

PV = T/nR

A new class of ceramics materials was discovered in.

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1938

1958

1978

1986

Any substance that can flow is a

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Solid

Gas only

liquid only

Fluid

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