Question # 1

Atmospheric pressure acts in:

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upward direction

Down ward direction

Opposite of force

All direction

Rocket works on principle of ______________

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Action Reaction

Law of inertia

Mass energy

Nil

If a 20 N wight of block hang with the string vertically then tension in string is:

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0 N

20 N

2 N

10 N

Centre of gravity of uniform square is:

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Intersection of diagonals

Point of intersection of medians

At centre

None of these

Earth's gravitational force of attraction vanishes at:

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6400 km

Infinity

42300 km

1000 km

P.E is equal to:

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mgh

1/2 mv²

W x F

None of these

In falling object potential energy is covered to:

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K.E

Force

P.E

Nil

The scientist who notice that all the freely falling objects hae same acceleration.

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Einstein

Galileo

Coulomb

Newton

Heat capacity of 5 kg water is.

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2000 JK^-1

2100 JK^-1

21000 JK^-1

210000 JK^-1

Which surface is bad emitter:

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White surface

Black surface

Coloured surface

Silver surface

Formula of Gravitational potential energy is:

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mgh

mg/h

1/2 mv²

None of these

The unit of coefficient of friction .

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Newton

ms^-1

ms^-2

No unit

If base of a right angle triangle is 3 cm and perpendicular is 4 cm. What is length of perpndicular?

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3 cm

2 cm

5 cm

10 cm

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