Free Printable X- Set 1

1.

When a force acts on _______________ body, the body goes in linear motion

a)

Stationary rigid body.

b)

Stationary flexible body.

c)

The pivoted rigid body.

d)

None of the Above

2.

When a force acts on _______________ body, the body goes in rotational motion.

a)

A rigid body pivoted at a point.

b)

Stationary flexible body.

c)

The pivoted rigid body.

d)

.None of the Above.

3.

S.I. Unit of moment of force is,

a)

newton meter.

b)

Nm.

c)

Dyne cm.

d)

Kgf m.

4.

The rotation is always produce by a

a)

Applied force.

b)

Pair of forces.

c)

Pull and push.

d)

All of the above.

5.

A body is pivoted and a force of 20 N is applied at a distance of 60 cm from the pivot. The moment of the force is,

a)

12N

b)

1200 Nm

c)

12 Nm.

d)

1200 N cm.

6.

Calculate the moment of force F1 at O

a)

10 N m clockwise.

b)

10 N m anticlockwise.

c)

12 N m clockwise.

d)

12 N m anticlockwise.

7.

Two forces each of magnitude 10N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4m which is pivoted at its mid-point O as shown. Determine the magnitude of resultant moment of forces about the pivot O.

a)

40 N m anticlockwise.

b)

40 Nm (clockwise).

c)

0.

d)

80 N m Anticlockwise

8.

The factor on which the position of centre of gravity of a body depend,

a)

Its shape i.e. on the distribution of mass.

b)

It does not depend upon shape but only on size.

c)

Position on the earth.

d)

All

9.

When a boy weighing 20 kgf sits at one end of a 4m long see-saw, it gets depressed at its end. He can be brought to the horizontal position by a man weighing 40 kgf by applying the force at

a)

2m

b)

1m

c)

2cm

d)

4cm

10.

The centre of gravity of a hollow cone of height h is at distance x from its vertex where the value of x is:

a)

h/3

b)

h/4

c)

2h/3

d)

3h/4

11.

This force is fictitious force.

a)

Moment of force.

b)

Centrifugal force.

c)

Centripetal force.

d)

Electrostatic force.

12.

Which of the following quantity remains constant in uniform circular motion

a)

Velocity

b)

Speed

c)

Acceleration

d)

Both velocity and speed

13.

One of the factors affecting the turning effect of a force.

a)

The magnitude of the energy applied.

b)

The magnitude of the force applied.

c)

The magnitude of the gravity working.

d)

The friction between the moving part

14.

The disc will rotate in

a)

Circular

direction.

b)

In the direction of the applied force.

c)

Clockwise moment

d)

Anticlockwise moment.

15.

A body is acted upon by two unequal forces in opposite directions, but not in the same line. The effect is that:

a)

The body will have only the rotational motion

b)

The body will have only the translational motion

c)

The body will have neither the rotational motion nor the translational motion

d)

The body will have rotational as well as translational motion.

16.

A nut is opened by a wrench of length 20 cm. If the least force required is 5.0N, find the moment of force needed to turn the nut.

a)

0.5 Nm

b)

1 N m.

c)

10 N cm.

d)

100 N cm

17.

The diagram shows a uniform bar supported at the middle point O. A weight of 40 gf is placed at a distance 40cm to the left of the point O. How can you balance the bar with a weight of 80 gf?

a)

40 cm from 0.

b)

20 cm from 0.

c)

40 cm from 50 cm on the left side.

d)

At the center of gravity.

18.

It is easier to turn the steering wheel of a large diameter than that of a small diameter because,

a)

To turn the steering wheel of a large diameter need less force which is at a large distance from the centre of rim.

b)

To turn the steering wheel of a large diameter need negligible force which is at a large distance from the centre of rim.

c)

To turn the steering wheel of a large diameter maximum force which is at a large distance from the centre of rim.

d)

large wheels can turn easily.

19.

A _____is always required to produce the rotation.

a)

Energy.

b)

Force

c)

Couple

d)

All the above.

20.

Which of the followings is an example of work done against force?

a)

Getting up with the stairs

b)

Get down with the stairs

c)

Walking on the flat ground

d)

Dropping any object down from the top

21.

If a person walks on horizontal road with a suitcase on his hand then the work done is zero.

a)

This statement is true

b)

This statement is false

22.

The direction of force along the axis of rotation is

a)

Inwards

b)

Outwards

c)

Either A or B

d)

None

23.

Due to application of 5 N force an object moves 10 meter along perpendicular direction of the force. What amount work is done?

a)

50 Joule

b)

15 Joule

c)

5 Joule

d)

0 Joule

24.

Work done in raising a box on to a platform depends on ____

a)

how fast it is raised

b)

strength of the man

c)

the height to which it is raised

d)

the path through which it is

25.

What is the work done by the centripetal force on the object moving in circular motion?

a)

Positive

b)

Negative

c)

Zero

d)

None of the above

26.

With what velocity a student of mass 60 kg run so that his K.E. becomes 270 J

a)

10m/s

b)

3m/s

c)

20m/s

d)

2.5m/s

27.

How much power is required to lift a body of mass 100 kg to a height of 60 m in 1 minute? Take g = 9.8m/s²

a)

100 W

b)

980 W

c)

9.8 W

d)

1980 W

28.

A Person Holds a Bucket by Applying a 10n Force. He Then Moves a Horizontal Distance of 5m and Climbs up a Vertical Distance of 10m. Find out the Total Work Done by him?

a)

100J

b)

150J

c)

50J

d)

200J

29.

When the displacement along the opposite direction of the force. Then the work is said to be__________

A.

a)

Zero

b)

Negative

c)

Positive

d)

Infinite

30.

In an electric cell while in use, the change in energy is from:

a)

Electrical to Mechanical

b)

Electrical to chemical

c)

Chemical to mechanical

d)

Chemical to electrical

31.

Light energy to electrical energy

a)

Photoelectric cell

b)

Electric cell

c)

Electric Bulb

d)

None of these

32.

. When mass and velocity of the body is doubled then the K.E. will ____

a)

Increase by 8 times

b)

Decrease by 8 times

c)

Increase by 4 times

d)

Remains the same

33.

Which statement is not true for the machine?

a)

It can multiply force

b)

it can increase speed

c)

It can Change the direction of applied force

d)

Its output can be more than input.

34.

Which of the statements is not true for an actual machine?

a)

Its mechanical advantages is less than velocity ratio

b)

Its efficiency is always less than 100%

c)

M.A > V.R

d)

Output of the machine is always less than input.

35.

Which of the statements is not true for an Ideal machine?

a)

M.A = V.R

b)

M.A ＜ V.R

c)

Work output = Work Input

d)

𝞰=100 %

36.

The correct relationship between the effort (E), load (L) and M. A is :

a)

M.A = L X E

b)

M.A X E = L

c)

M.A X L = E

d)

None

37.

A machine is 80 % efficient ;What does this imply?

a)

80 % of the total energy supplied to the machine at the load point is obtained as useful energy at the effort point.

b)

80 % of the total energy supplied to the machine at the effort point is obtained as useful energy at the load point.

c)

𝞰 > 1

d)

M.A > V

38.

Output Energy is equal to:

a.

b.

c.

d.

a)

Load X Displacement of the point of application of load

b)

Effort X Displacement of the point of application of load

c)

Effort X Displacement of the point of application of effort

d)

Load X Displacement of the point of application of effort

39.

A machine is 80 % efficient; what does this imply?

a)

The remaining 20 % of the energy supplied is lost in overcoming the force of friction

b)

It appears as heat energy in different parts of the machine

c)

0.8

d)

All the above

40.

A machine in which the displacement of load is less than the displacement of effort Will have :

a)

V.R ＜ 1

b)

V.R > 1

c)

V.R = 1

d)

M.A > 1

41.

A machine having M.A > 1 acts as a force multiplier.

a)

True

b)

False

42.

In machine if the displacement of load is equal to the displacement of effort:

a)

Act as force multiplier

b)

Act as speed multiplier

c)

Used to change the direction of effort

d)

None of the above

43.

The Block and Tackle system, has V.R= 4 and efficiency =75% Find M.A

a)

4

b)

3

c)

2

d)

2.5

44.

A fixed pulley is driven by 100kg mass and lifts the load of 75 kgf. Calculate:

The efficiency of the pulley.

a)

0.85

b)

1

c)

0.75

d)

0.80

45.

Observe the diagram and write V.R and M.A if the efficiency is 80 %.

a)

V.R = 4 and M.A = 3.2

b)

V.R = 4 and M.A = 3.2

c)

V.R = 4 and M.A = 3.2

d)

V.R = 4 and M.A=3.6

46.

Observe the diagram and write the V.R and M.A.

a)

V.R = 2 and M.A = 2

b)

V.R = 2 and M.A = 1

c)

V.R = 2 and M.A = 1

d)

V.R = 2 and M.A = 1

47.

There is a machine in which the V.R is 4 and M.A is nearly 4. If the friction in machine increases :

a)

V.R and M.A will remain same

b)

V.R will decrease

c)

M.A will increase

d)

M.A Will decrease

48.

The diagram shows a single pulley system when a load of 20 Kgf is attached to it. if efficiency is 80 % calculate effort applied.

a)

12.0 Kgf

b)

12 N

c)

12.5 kgf

d)

20 N

49.

A pulley system in block and tackle system has 5 pulleys in all. Its velocity ratio is :

a)

5

b)

Less than 5

c)

More than 5

d)

More than 5

50.

A pulley system has 4 pulley in all and is 60 % efficient Calculate the effort required to lift 1200N

a)

450 N

b)

350 N

c)

500 N

d)

550 N

X- Set 1

Total questions: 50

Worksheet time: 2hrs 40mins

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