Question # 1

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

The Stephen-Boltzmann law for the black body radiation is given by

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E = T²

E = -T²

E = T⁴

E = -T⁴

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

Crystalline solids are in the form of:

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Metals

Ionic Compounds

Ceramics

Both (A) and (B)

All of these

A container has a small hole in the bottom. Air can go through this hole,but water cannot. This can be best explained by the statement that

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water contains hydrogen atoms, air does not

water molecules are smaller than molecules in the air

surface tension of the water prevents it from

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

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Energy only

Momentum only

Mass only

Charge only

Both (A) and (B)

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

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Q/4πr²

2Q/4πr²

Q.d

Zero

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

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a rocket

an aeroplane

a projectile

a ballon

A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?

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0.1 m/s

10 m/s

1 m/s

0.01 m/s

The reactance of a coil when used in the domestic A.C. power supply (220 volts, 50 cycles per second) is 50 ohms. The inductance of the coil is nearly

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2.2 henry

1.6 henry

0.22 henry

0.16 henry

The magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None of these

The instantaneous velocity is define as the limiting value ofΔd/Δtwhen the time intervalΔt approaches to

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zero

maximum

minimum

infinity

Which of the material have largest value of young's modulus

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Copper

Diamond

Aluminum

Iron

Torque will be zero if

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body is at rest

rotating with uniform angular velocity

zero angular acceleration

all of them

By which principle we can locate the position of new wavefront after a later time?

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principle of irreversibility

principle of light

Archimedes principle

Huygen's principle

The rate at which the battery is supplying the electrical energy is the:

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Power output

Electrical power

Power input

Both A and C

Which of the following pairs of electrical units are the units equivalent?

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Coulomb; As^-1

Farad ; C^-1V

Pascal: Nm^-2

Volt ; JC

The path (or trajectory) described by a projectile is

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a parabola

a hyperbola

a circle

a straight line

Electrons move in the field from

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Low to high potential

High to low potential

Electric field to magnetic field

None of these

In case of destructive interference of two waves, the amplitude of the resultant wave will be_______either of the waves:

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Greater than

Smaller than

Equal to

none of these

The units of modulus of elasticity are

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Nm^-2

Nm²

Torr

Both B and C

The speed of sound in air is

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320 ms^-1

323 ms^-1

330 ms^-1

333 ms^-1

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