Question # 1

The kinetic energy of a body of mass 2 kg is 25J, its speed is

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5 ms-1

12.5 ms-1

25 ms-1

50 ms-1

Unit of thermal conductivity is .

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Wmk

W m^-1 K^-1

Wm

None of these

A body possesses if it is capable to do work:

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Energy

Power

Force

All

Thermal conductivity of iron is Wm^-1 K^-1

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85

36

89

86

Metals are good conductor of heat due to

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Free Electrons

Big size of their molecules

Small size of their molecules

Rapid vibrations of their atoms

One liter is equal to:

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1 kgcm-3

1000 cm-3

10-6 m3

10-3 m3

Land and Sea breezes are the results of:

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Conduction

Convection

Radiation

Conduction and Radiation

Which one of the following converts light energy into electrical energy?

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Electric bulb

Electric generator

Photo cell

Electric cell

Friction causes _____________

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Heat

Light

Mass

Weight

The product of mass and velocity is called ................. .

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Momentum

Force

Acceleration `

Nil

Metals are good conductor of heat dut to the:

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Free electron

Big size of their molecule

Small size of their molecules

Rapid vibrations of their atoms

When 10 N along positive x-axis and 7 N along negative x-axis are added by head to tail rule. The resultant force is:

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17 N

10 N

7N

3 N

Coefficient of friction between tyre and dry road is.

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0.6

1

0.05

0.2

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