Question # 1

O maximum height the P.E of the body is:

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Zero

Maximum

Minimum

None of these

P.E is equal to:

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mgh

1/2 mv²

W x F

None of these

Ability of body to do work due to its height is called.

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potential energy

kinetic energy

gravitational potential energy

elastic potential energy

The unit of work is :

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J

N

Ns

m

The energy stored in a dam is:

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Electric energy

Potential energy

Kinetic energy

Thermal energy

P.E is calculated by a formula :

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Mgh

mg

gh

Nil

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

If the direction of motion of the force is perpendicular to the direction of motion of the body, then work done will be

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Maximum

Minimum

Zero

None of these

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

One horse power is equal to:

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746 W

749 W

764 W

794 W

The energy stored in coal is

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Heat energy

Kinetic energy

Chemical energy

Nuclear energy

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

Formula of work is:

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F X S

F X V

F/S

S/F

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