Question # 1

Work is a

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Scalar quantity

Vector quantity

Basic quantity

None of these

A body has P.E. = mgh, when it is at height 'h' from the ground. At the point at the distance 'x' below from the top its P.E. with

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mgh

mgx

mg(x-h)

None of these

Original source of energy for biomass is

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Earth

Star

Moon

Sun

Identity the non conservative force among the following.

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Frictional force

Electrical force

Gravitational force

Elastic restoring force

If a body of mass 5 kg is raised vertically through a distance of 1 m, then work done is.

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49 J

4.9 J

490 J

0.49 J

The K.E. of bullet of mass 500 gm moving at a speed of 200 ms-1

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250 J

125 J

2500 J

10,000 J

The dimensions of work are

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MLT^-1

MLT^-2

ML²T^-2

ML^-1T^-1

The unit of work in base unit is

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Kg m-1 sec-2

Kgm sec-2

Kgm2 sec-1

Kgm-1 sec-1

The commercial unit of electric energy is

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Kilo watt hour

watt

Watt hour

Kilo Watt

If velocity 'v' of an object is double, then K.E. because.

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Remain same

Sixteen times

Double

Four times

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