Question # 1

Hydraulic press in works on:

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Pascal's law

Hook's law

Archimedes law

Principle of floatation

Friction is caused by :

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Shining surface

Rough surface

Polished surface

Nil

Earth's gravitational force of attraction vanishes at

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6400 km

Infinity

42300 km

1000 km

Action and Reaction are always on:

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Same body

Different bodies

Any body

None of these

The kinetic energy of a body of mass 2 kg is 25J, its speed is

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5 ms-1

12.5 ms-1

25 ms-1

50 ms-1

The unit of strain is:

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Nm^-2

Pa

Newton

None

Perpendicular / hypotenuse is equal to:

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Cosθ

Tanθ

Cosecθ

Sinθ

In which hot liquid can remains hot:

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Glass

Lead

Thermos

Hot pot

The ratio of useful output to input energy is called:

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Power

Energy

Efficiency

Horse power

The mass of a body

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Decreases when accelerated

Increases when accelerated

Decreases when moving with high velocity

None of the above

The process in which heat is transfer due to actual movement of molecule is called.

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Conduction

radiation

Convection

All of these

The centripetal acceleration is always along.

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Normal force

Centripetal forces

Mass

Horizental forces

During recent years the percentage of __________ increased considerably on earth:

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Carbon dioxide

Nitrogen

Oxygen

Methane

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