Question # 1

The special theory of relativity is based on:

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Four postulates

Three postulates

Two postulates

One postulate

None of these

The magnitude of the displacement is a line from initial position to final position which is

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straight

curved

either be curved or straight

none of them

The instantaneous velocity of a body moving along a circle is directed

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along the radius

along the tangent

away from the circle

none of them

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

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0.52 A

1 mA

0.7 mA

1.4 A

When some compass needles are placed on a card board along a circle with the center at the wire, they will

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Point the direction of N-S

Set themselves tangential to the circle

Point in the direction of E-W

None of these

Point in direction of S-E

When a platinum wire is heated, it appears dull red at about

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500°C

900°C

1100°C

1300°C

The whole structure obtained by the repetition of unit cells is called:

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Crystal lattice

Amorphous solid

Polymeric solid

Polysterne

None of these

Most practical applications of electricity involve

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Charges at rest

Charges in motion

Electrons at rest

Atoms in motion

Molecules in motion

Origin of the electric and the gravitational forces

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Was known in 1911 A.D.

Was known in 1811 A.D.

Was known in 1711 A.D.

is still unknown

Was known in 1611 A.D.

In a metal, the valence electrons are:

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Attached to individual atoms

Not attached to individual atoms

Free to move within the metal

Both A and B

Both A and C

The collision in which KE is conserved but momentum is not conserved is called:

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Elastic collision

Inelastic collision

any these

None of these

At the present time, the main frontiers of fundamental science are

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2

3

4

5

A steel bar can bear a load of 20 tons. If the thickness of bar is double, then for the same depression it can bear a load of:

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40 ton

80 ton

160 ton

5 ton

Light is a type of energy which produces sensation of

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Sound

Feeling

Vision

None of these

What type of science is Physics

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Living things

Non-living things

Experimental science

None of these

We can achieve polarization by

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Absorption

Reflection

Scttering

All of above

The young modulus of steel is greater than that of aluminium.

Keeping the statement above in mind state which of the following is true

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Steel requires a larger stress on it for a given strain than does aluminium

Aluminium requires more force than steel does to get a similar extension as steel

Steel requires less force than aluminium does to get a similar extension as aluminium

Steel requires a larger strain on it for a given stress than does aluminium

In electromagnetic waves electric and magnetic field ar

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Parallel

Antiparallel

Perpendicular

Sometimes parallel sometimes perpendicular

Newton's third law says, that the action and reactions are

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Equal but in the same direction

Equal but in opposite direction

May be unequal but in the same direction

May be unequal but in opposite direction

The dimensions of force are

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[MLT^-1]

[M^oLT^-2]

[MLT^-2]

[ML⁰T^-2]

A body of mass M kg is lifted by a man to a height of one metre in 30 s. Another man lifts the same mass to the same height in 60 s.The work done by them is in ratio

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1 : 2

1 : 1

2 : 1

4 : 1

In a uniform circular motion of a particle, the direction changes but not its

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Angular displacement

Magnitude of velocity

Force towards centre

b and c

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