Question # 1

The potential energy of a body of mass 'm' placed at a height 'h' above the surface of earth is equal to

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P.E. = mg

P.E. = mgh

P.E. = 3mgh

P.E. = 2mgh

Fossil fuels are usually:

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Carbon di oxide

Hydrogen

Hydrocarbons

Carbon monoxide

Which one of the following converts light energy into electrical energy:

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Electric Bulb

Electric Generator

Photocell

Electric generator

if a body of a mass 'm' is moving with velocity 'v' then its K.E. is given by

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K.E. = 1/2 mv

K.E. = 1/2 mv2

K.E. = mv2

K.E. = 1/2 m2v

Formula of Power:

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P = wt

P = w/t

P = t/w

P = w/t²

The product of force and displacement is called;

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Work

Efficiency

Power

Energy

Which pair of physical quantities has same SI unit?

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energy , power

power , work

energy , work

work , momentum

The ratio of useful output to input energy is called:

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Power

Energy

Efficiency

Horse power

One liter is equal to:

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1 kgcm-3

1000 cm-3

10-6 m3

10-3 m3

The tendency of doing work is called :

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Time

Energy

Force

Area

The energy stored in coal is

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Heat Energy

Kinetic energy

Chemical energy

Nuclear energy

A body possesses if it is capable to do work:

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Energy

Power

Force

All

P.E is calculated by a formula :

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Mgh

mg

gh

Nil

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