Question # 1

_____________ easily undo bolt?

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Long spanner

Medium

Short spanner

Every spanner

Heat form one of a metal rod a reaches to the other by the process of

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convection

radiation

conduction

both (a) and (b)

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

In falling object potential energy is covered to:

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K.E

Force

P.E

Nil

Worst absorber of heat is:

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Dull black surface

Coloured surface

Shinning silvered surface

White surface

One liter is equal to:

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1 kgcm-3

1000 cm-3

10-6 m3

10-3 m3

Clockwise torque is taken:

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Positive

Negative

Neutral

Nil

The force acting on unit area at surface of a body is called:

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Strain

Elasticity

Force

Stress

Specific heat of water is J kg^-1 K^-1IS:

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4200

4000

1000

2500

Co-efficient of friction between wood and concrete.

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0.63

0.8

1

0.9

The formula for centripetal force is:

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Fc = mv2

Fc = mr2

Fc = mv2 / r

Fc = m/v

At sea level, the atmospheric pressure is about.

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101320 Pa

101300 Pa

10110 Pa

10112 Pa

Metals are good conductor of heat due to:

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Free electrons

Reamain same

Small size of their molecules

Rapid vibration of their atoms

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