Question # 1

Which of the substance is the lightest one?

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Copper

Mercury

Aluminim

Lead

Which machine is used to find acceleration due to gravity?

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Centrifuge

Atwood machine

Hydraulic machine

Washing machine

Cream separater works on:

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Centrifuge principle

Centripetal force

Both

None

The direction of momentum is

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opposite to motion

Along the velocity

Perpendicular to motion

None of these

There are ways to transfer the heat from one place to another.

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1

2

3

4

Which gas behaves as glass or polythene to radiation:

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Nitrogen

Hydrogen

Carbon di oxide

Methane

Gravitational force is a:

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Electric force

Magnetic force

Reactional force

Electromotive force.

When a hammer raised up its energy will be:

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Mechanical energy

Gravitational potential energy

Chemical energy

Nuclear energy

Heat can be transmitted form one object to the other by

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convection

radiation

conduction

all of these

Density is quantity:

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Scalar

Vector

Constant

None of these

What is the effect of lubricicantion?

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Increase friction

No effect

Reduce friction

None

If the velocity of body increases with time, the acceleration will be.

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Negative

Uniform

Positive

Variable

The radiation from sun is:

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Alpha

Gamma

Radio

Ultraviolet

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