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

The S.I unit of efficiency is :

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J/s

Nm

watt

It has no unit

When a body is lifted through a height the work done on its appears in the form of its:

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Kinetic energy

Potential energy

Elastic potential energy

Geothermal energy

P.E is equal to:

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mgh

1/2 mv²

W x F

None of these

In Einstein's mass-energy equation c means speed of light. Its value is:

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3 x 10^-8 ms^-1

3 x 10⁸ms^-1

3 x 10⁹ms^-1

3 x 10¹⁸ms^-1

Work done is maximum when angle between force and displacement is:

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45°

0°

60°

90°

Formula of work is:

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F X S

F X V

F/S

S/F

Solar energy is a type of.

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Renewable

Non-renewable

Natural

None

The product of force and distance is :

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Force

Work

Torque

Nil

What type of conversion is done candle burning?

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Chemical __ ;light

Chemical __ heat

Both a & b

None of above

Work is done when force displace inits own _____________

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Way

Method

Direction

None

Solar cell is are also known as:

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Electric cell

Photo Cell

Sun cells

Nuclear cells

The energy of a body during the motion is called:

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Potential energy

Kinetic energy

Elastic P.E.

Heat energy

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