Question # 1

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

1 KW (kilo Watt) is equal to:

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10² W

10³ W

10⁵ W

10⁶W

Mathematically, % efficiency is defined as & nbsp

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Efficiency % required form or input/ total input energy x 100

Efficiency % input energy / output energy x 100

Efficiency % work / time x 100

P.E is calculated by a formula :

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Mgh

mg

gh

Nil

_____________ is an other unit of power.

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J

W

hp

W/J

1 hp is equal to :

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747 W

746 W

748 W

1000 W

If the velocity of a body becomes double, then its kinetic energy will:

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Remain the same

Become double

Become four time

Become half

SI unit of work is:

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Joule

Coulomb

Ampere

Kelvin

1 mega watt is equal to:

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10² W

10³ W

10⁵ W

10⁶W

The S.I unit of efficiency is :

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J/s

Nm

watt

It has no unit

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

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Electric Bulb

Electric generator

Photocell

Electric cell

The ratio of output to input is called:

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work

Efficiency

Force

All of above

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

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Electric bulb

Electric generator

Photo cell

Electric cell

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