Question # 1

Which vector gives the displacement from one point to another in space.

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Position vector

Unit vector

Null vector

Distance vector

The SI unit of impulse is.

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N m

N s

Kg ms -1

Both b and c

In simple harmonic motion we have the conservation of.

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K.E.

P.E

Total energy

Electrical energy

The point of which an applied force produces a linear acceleration but no rotation is called.

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Centre of the body

Centre of the mass

Centre of gravity

Weight of the body

When a body is lifted through a height 'h' the work done on the body appears in the form of.

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K.E

P.E

Heat

Density

Which of the following is not a unit of plane angle.

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Degree

Radian

Gradian

Steradian

A body is thrown vertically upward with initial velocity 9.8 ms-1 it will reach the height.

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4.9 m

19.9 m

29.4 m

49.2 m

The gravitational strength on the surface of moon is 1.6 N kg-1 What will be the mass and weight of an object respectively on the surface of the moon.

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10 kg , 1.6 N

10 Kg , 16 N

16 Kg, 10 N

16 kg, 160 N

Distance covered by a freely failing body in 2 s will be.

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19.6 m

4.m

39.2 m

44.1 m

if the line of action of force passes through the axis of rotation of origin, then torque is.

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Maximum

Negative

Zero

1

The rate of change of momentum of a body falling under gravity is equal to its.

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P.E.

K.E

Weight

Density

The hydrogen filled balloon possesses

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P.E

K.E

Heat energy

Elastic energy

A fixed pulley is emplyed to

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Do some work

Change the directionof force

Do more work with the same force but without using the pulling

Have mechanical advantage greater than 1

A man in an elevator ascending with an acceleration will feel that his weight.

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Has increased

Has decreased

Remains the same

Vanishes

The dimensional formula for torque is identical to.

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Kinetic energy

Pressure energy

Moment of force

All of the above

If two non zero vectors are perpendicular to each other then their scalar product is equal to.

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-1

1

0

Infinity

The SI unit of momentum is.

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kg m s-2

kg m2 s-2

kg m s-1

kg s-1

When an unbalanced external force acts on a body for a short interval of time.

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The body will experience an impulse.

The momentum of the body increases

The velocity of the body increase

The body is not effected

If a force of 10 N makes an angle of 30 ^o with x-axis its component is given by

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1.866 N

8.66 N

0.89 N

0.866 N

A force of 100 N acts on body of mass 5 kg for 10 s. The velocity of the body will be.

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2 ms -1

20 m s-1

200 ms-1

2.000 m s-1

The escape velocity

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Is independent of mas of the body

Increases with the increases of mass of the body

Decreases with the decreases of mass of the body

Depends upon the type of body used

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