Question # 1

In which of the following state molecules don not leave their position?

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Solid

Liquid

Gas

Plasma

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

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

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45°

0°

60°

90°

Einstein's mass-energy equation relation is:

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E =1/2 mc²

E =mc²

E =m²c

E = 2 mc²

hp stands for :

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1w

Horse power

Joule

All are true

The kinetic energy of the body of mass 1000 kg moving a speed of 20 ms^-1 will be:

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2 x 10² J

2 x 10³J

2 x 10⁵J

2 x 10⁸J

Which of following units is equal to Kgm² s^-2

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Newton

Joule

Watt

Coloumb

_____________ is an other unit of power.

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J

W

hp

W/J

In Einstein's mass-energy equation, c is the

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Speed of sound

Speed of light

Speed of electron

Speed of Earth

If 1N is force and body is displaced to 1m than work is :

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2 J

1 J

3 J

4 J

The potential energy of a body of mass 'm' placed at a height 'h' above the surface of earth is equal to

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P.E. = mg

P.E. = mgh

P.E. = 3mgh

P.E. = 2mgh

The energy of a body during the motion is called:

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Potential energy

Kinetic energy

Elastic P.E.

Heat energy

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

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