Question # 1

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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Newton

Joule

Joule-Sec

Joule-s^-1

Watt

When platinum wire is heated, it appears cherry red at

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1600°C

900°C

1100°C

1300°C

The body oscillates due to ______ accelerates and overshoots the rest position due to _____:

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Applied force , inertia

Restoring force, friction

Frictional force, inertia

Restoring force, inertia

In case of point, source of light shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called

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Mutual induction

Mutual inductance

Capacitance

Self inductance

An emf is set up in a conductor when it:

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

A rocket carries its own fuel in the form of

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liquid only

liquid or solid

liquid and solid

liquid or solid and oxygen

Essential characteristic of equilibrium is

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Momentum equal to zero

Acceleration equal to zero

Kinetic energy equal to zero

Velocity equal to zero

How many isotopes of helium are present?

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1

2

3

4

When the temperature of source and sink of a heat engine become equal entropy change will be

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Zero

Max

Min

-ve

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Air currents of the earth atmosphere

Surface tension effect

Viscous force exerted by air

In old age, arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from

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Pascal's law

Stoke's law

Bernoulli's principle

Archimedes principle

If a gymnast sitting on a rotating table with his arms out stretched suddenly lowers his hands

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The angular velocity decreases

The moment of inertia decreases

The angular velocity remains constant

The angular momentum increases

The acceleration of the rocket is

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a = MV/m

a = mM/V

a = mM/2V

a = mV/M

A 1500 kg car has its velocity reduced from 20 ms^-1 to 15 ms^-1 in 3.0 S. How large was the average retarding force

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- 4.5 KN

- 2.5 KN

- 3.7 KN

- 4.3 KN

A wire breaks of stretched by more than 3mm. It is cut into equal parts. Then each part can be stretched with out-breaking by

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0.75 mm

1.5 mm

3.0 mm

6.0 mm

Angle between ray of light and the corresponding wavefront is:

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0°

60°

90°

120°

Diamagnetic substances are those in which

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Spin and orbital motions are supported

Spin and orbital motions are opposed

Resultant of spin and orbital motion is zero

None of these

Light appears to travel in straight line because

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It is not absorbed by the atmosphere

It is refracted by the atmosphere

Its wavelength is very small

Its velocity is very large

The blood pressure of man

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Increase with age

Decrease with age

Remains same

Cannot predicted

The centre of gravity of an object is

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The force of gravity on the object

The point about which the object rotates

The point at which the total weight of the object act

none of these

Multimode step index fibre is useful for

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short distance

long distance

both a and b

none of them

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