Question # 1

Friction is due to

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Roughness

Shape

Smoothness

None

Water on cooling below 4 ^oC begins to:

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Expand

Contract

Boils

None of these

Evaporation causes:

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Melting

Boiling

Freezing

Cooling

The value of G is _________ every where:

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Same

Varying

Changing

1.62

A crate is moved by pulling the rope attached to it. it moves 10 m on straight horizontal read by a force of 100 N. How much work will be done when the rope is making an angle of 30° with the road?

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5 Joules

86 Joules

707 Joules

866 Joules

PQ & RS are 2 parallel forces moving in same direction than they are called ............... forces.

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Like parallel

Unlike

Parallel

Nil

Rooms are heated using gas heater by:

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Conduction only

Convection and radiation

Radiation only

Convection only

Centre of gravity of sphere is at:

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Centre of sphere

Outside of sphere

Radius of sphere

None of these

Moon is ____ satellite.

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Natural

Communications

Artificial

Geostationary

Larger number of slots are made in radiators to increase:

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Surface temperature

Surface area

Both A and B

Nonr

The value of gravitational constant "G" is Nm² kg^-2

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6.67 x 10^-21

6.67 x 10^-11

6.67 x 10^-23

6.67 x 10¹¹

Friction is caused by :

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Shining surface

Rough surface

Polished surface

Nil

What will be the magnitude of work if a force of 25N pulls a stone through a distance of 5 m in its directions

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25 J

50 J

75 J

125 J

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