Question # 1

The unit of work is :

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J

N

Ns

m

1 mega watt is equal to:

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10² W

10³ W

10⁵ W

10⁶W

The energy of a body during the motion is called:

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Potential energy

Kinetic energy

Elastic P.E.

Heat energy

Formula of Power:

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P = wt

P = w/t

P = t/w

P = w/t²

The work is negative if the angle between force and displacement is:

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0°

45°

90°

180°

The work done in lifting a brick of mass 2 kg through a height of 5 m above the ground will be:

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2.5 J

12.5 J

50 J

100 J

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

The S.I unit of power is :

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j/s2

J

W

J/M2

How many components are there of a solar heating system?

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2

3

4

5

1 MJ=

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10³ J

10⁶J

10⁷J

10^-3J

When a hammer raised up its energy will be:

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Mechanical energy

Gravitational potential energy

Chemical energy

Nuclear energy

The kinetic energy of a body of mass 2 kg is 25 J. Its speed is:

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5 ms^-1

12.5 ms^-1

25 ms^-1

50 ms^-1

Einstein's mass-energy equation is

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E = mc

E = mc2

E = 2mc

E = m2c

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

Kinetic energy is possessed by a body by:

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Virtue of motion

Height

Rest

Nil

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