Question # 1

When a hammer raised up its energy will be:

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Mechanical energy

Gravitational potential energy

Chemical energy

Nuclear energy

The centre of gravity of uniform triangle is:

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Point of intersection of medians

On its vertex

On middle point of its axis

Point of intersection of diagonal

Which of the following is an insulator?

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Wood

Glass

Plastic

Steel

More radiation is reflected by the surface:

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White

Coloured

Black

Rough

Value of g on mercury is ___________ ms^-2.

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25.94

3.7

8.87

1.62

Which of the following affects evaporation?

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Temperature

Surface area of the liquid

Wind

All of the above

Which types of friction of maximum

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Sliding

Rolling

Both a and b

None

Earth's gravitational force of attraction vanishes at

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6400 km

Infinity

42300 km

1000 km

The unit of co-efficient of linear expansion :

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K

K^-1

Jkg^-1 K^-1

None of these

In a dam the water energy is called:

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Heat energy

Electrical energy

G.P.E

Mechanical enrgy

Kilowatt - hour is unit of _____________

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Power

Energy

Work

K.e

Which of the following relation is correct?

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F = m/a

F = m-a

F = ma

F = m + a

1 KW (kilo Watt) is equal to:

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10² W

10³ W

10⁵ W

10⁶W

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