Question # 1

The weight of an object an elevator moving down with an acceleration of 9.8 m/s2 will becomes

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Half

Double

Unchanged

Zero

If the object is at 5 cm from the lens of simple microscope than its magnifying power will be.

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5

10

15

25

The product of rotational inertial 'I' and angular velocity ' w' is equal to.

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Torque

Linear momentum

Angular momentum

Force

In order to produce beats, the two sound waves should have.

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The same amplitude

Slightly different amplitude

The same frequency

slightly different frequencies.

The efficiency of heat engine whose sink is at 17 ^oC and source at 200 ^oC is.

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38%

63%

80%

90%

Hot igneous rocks, usually in molten or partly molten state are found in the depth of

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5 km

10 km

15 km

20 km

If the initial velocity of a projectile becomes doubled, the time of fight will be.

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Same

4 times

Double

3 times

All point of the rigid body rotating about a fixed axis do not have same.

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Angular acceleration

Angular speed

speed

Angular displacement

Damping is the process in which energy

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Increases

Remains constant

Dissipates

None of these

When the amplitude of a wave become double, its energy becomes

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One half

Two times

Three times

Four times

The mathematical expression for the restoring force is.

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F = kx

F = ma

F = dp/dt

F = -kx

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

The subtraction of a vector is equivalent to the addition with

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Same direction

Perpendicular direction

Reversed direction

All of these

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

A convex lens acts as diverging lens if the object is placed at

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F

2F

Between F and 2 F

Within the F

The light energy travels in space as waves was firstly proposed by

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Maxwell

Young

Einsten

Hydrogen

Bunsen burner works on the principle of.

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Venturi effect

Terricilli's effect

Bernoulli's effect

None of these

Cloud formation in atmosphere is an example of.

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Isothermal process

Isochoric process

Adiabatic process

Isobaric process

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