# MCQ balbharti 8th science topic 3. Force and Pressure MCQ

1 ) Balanced forces are unequal in magnitude and act in opposite direction.

A ) False

B ) True

Ans A ) False

2 ) is required to change the state of rest or uniform motion of a body in a straight line.

A ) Mass

B ) Velocity C ) Force D ) Inertia

Ans C ) Force

3 ) A person slips over banana peel or mud, due to …………… .

A ) Decrease in frictional force.

B ) Increase in frictional force.

C ) Increase in gravitational force.

D ) Decrease in gravitational force.

Ans A ) Decrease in frictional force.

4 ) A fluid enclosed in a container exerts its pressure in all directions at a point within the fluid.

A ) Equally

B ) Non-uniformly

Ans A ) Equally

4 ) Force : N :: Pressure: ……………

A ) N/m B ) N/m2 C ) N/m3

Ans B ) N/m2

5 ) SI unit of Pressure is ………………

A ) Newton

B ) N/m

C ) Pascal

Ans C ) Pascal

6 ) The object floats inside the liquid if the buoyant force is equal to its weight.

A ) True

B ) False

Ans A ) True

7 ) Match the column

 Column-A Column-B i. Contact force a. Two forces acting in opposite direction. ii. Balanced force b. Boy kicking the ball c. Two force acting in same direction. d. Apple falling from the tree

A )

 Column-A Column-B i. Contact force a. Boy kicking the ball ii. Balanced force b. Two force acting in opposite direction. Column-A Column-B i. Contact force a. Apple falling from the tree ii. Balanced force b. Two force acting in same direction.

B )

Ans

 Column-A Column-B i. Contact force a. Boy kicking the ball ii. Balanced force b. Two force acting in opposite direction.

A )

8 ) Air pressure as one goes up in height from the sea level.

A ) Increases

B ) Decreases

Ans B ) Decreases

9 ) Lactometer works on Archimedes principle.

A ) True

B ) False

Ans A ) True

10 ) The property of a liquid to exert an upward force on an object immersed in it is called …………… .

A ) Pressure

B ) Force

C ) Buoyancy

D ) Density

Ans C ) Buoyancy

11 ) A person gets a forward jerk when a car stops suddenly due to ……………

A ) Inertia of direction B ) Inertia of motion C ) The velocity of car

D ) Weight of the person

Ans B ) Inertia of motion

12 ) Force exerted perpendicularly on a unit area is called ………………

A ) Balanced force

B ) Pressure

Ans B ) Pressure

13 ) We cannot stand at one place for a long time but can sleep on a place for long hours.

A ) True

B ) False

Ans A ) True

14 ) 1 bar = mbar

A ) 103

B ) 102

C ) 10

Ans A ) 103

15 ) Classify the following into contact and non-contact force.

A ) Contact force

B ) Non-contact force

Ans A ) Contact force

16 ) In absence of force, object will continue to be in the state of rest.

A ) False

B ) True

Ans B ) True

17 ) 1 Atmosphere = Pa

A ) 101 x 103

B ) 10.1 x 103

C ) 10.1 x 102

Ans A ) 101 x 103

18 ) Lifting, pushing, pulling are examples of force.

A ) Magnetic

B ) Muscular

C ) Gravitational

Ans B ) Muscular

19 ) Pressure as the depth of the liquid increases.

A ) Increases

B ) Decreases

Ans A ) Increases

20 ) Classify the following into contact and non-contact force.

An apple falling from the tree.

A ) Contact force

B ) Non-contact force Ans B ) Non-contact force 22 ) The SI unit of density.

A ) g/cc B ) Kg/cc C ) Kg/m3

Ans C ) Kg/m3

21 ) According to Archimedes principle, the buoyant force is equal to the weight of the fluid displaced by the object.

A ) False

B ) True

Ans B ) True

22 ) Classify the following into contact and non-contact force.

A cricket ball rolling down a cricket field.

A ) Contact force

B ) Non-contact force

Ans A ) Contact force

23 ) In tug of war, if the rope does not move, then balanced forces are acting on the rope.

A ) True

B ) False

Ans A ) True

24 ) Buoyant force is downward force acting on the object in water.

A ) True

B ) False

Ans B ) False

25 ) It is easier to swim in fresh water than in sea water.

A ) True

B ) False

Ans B ) False

26 ) Relative density has no units because …………… .

A ) It’s a ratio

B ) It’s a number

C ) It’s an inherent property of substance

D ) It’s a ratio of two similar quantities

Ans D ) It’s a ratio of two similar quantities

27 ) The atmosphere exists to about height.

A ) 14km

B ) 16km

Ans B ) 16km

28 ) Relative density of a substance is expressed w.r.t the density of water.

A ) True

B ) False

Ans A ) True

29 ) Classify the following into contact and non-contact force.

Boy lifting a book from the table.

A ) Contact force

B ) Non-contact force

Ans A ) Contact force

30 ) An instrument based on the Archimedes principle.

A ) Hydrometer

B ) Voltameter

Ans A ) Hydrometer

31 ) In atmospheric science, the unit for pressure is ………………

A ) Pascal

B ) Bar

C ) Newton

Ans B ) Bar

32 ) The pressure created due to air is called the pressure.

A ) Atmospheric

B ) Barometer

Ans A ) Atmospheric

33 ) The buoyant force is more if the volume of the dipping object is more.

A ) True

B ) False

Ans A ) True

34 ) The property of density is useful in deciding the purity of substance.

A ) False

B ) True

Ans B ) True

35 ) In unbalanced forces, the net force acting on the body is not zero.

A ) False

B ) True

Ans B ) True

36 ) The atmospheric pressure at a point in air is from all sides.

A ) Different

B ) Equal

Ans B ) Equal

37 ) The buoyant force is greater if volume of object submerged in liquid is …………… .

A ) Smaller B ) Larger C ) Equal D ) Half

Ans B ) Larger

38 ) pressure is exerted on all the objects kept in air.

A ) Air

B ) Liquid

Ans A ) Air

39 ) Formula for pressure is ………………

A ) P= F/A

B ) P=A/F

Ans A ) P= F/A

40 ) Classify the following into contact and non-contact force.

Pins getting attracted to the magnet.

A ) Contact force

B ) Non-contact force

Ans B ) Non-contact force

41 ) If area increases, pressure for the same force.

A ) Increases

B ) Decreases

Ans B ) Decreases

42 ) Density does not have any units.

A ) False

B ) True

Ans A ) False

43 ) Classify the following into contact and non-contact force.

A boy stretching the rubber band.

A ) Contact force

B ) Non-contact force

Ans A ) Contact force

44 ) Force is a scalar quantity.

A ) True

B ) False

Ans B ) False

44 ) 1kg/m3 = …………… .

A ) 10-3 g/cm3 B ) 103 g/cm3 C ) 1 g/cm3

D ) 100 g/cm3

Ans A ) 10-3 g/cm3

45 ) If two forces are acting on an object in same direction, then a force equal to their addition acts on that object.

A ) False

B ) True

Ans B ) True

46 ) According to Newton’s first law of motion, an object continues to be in the state of rest, if no force is acting on it.

A ) True

B ) False

Ans A ) True

47 ) Match the column

 Column-A Column-B i. Inertia of motion a. Passengers thrown opposite to the direction of turning. ii. Inertia of direction b. Fan continue to revolve even after switching. c. Coin falls in the glass after the cardboard is removed.

A )

 Column-A Column-B i. Inertia of motion a. Coin falls in the glass after the cardboard is removed. ii. Inertia of direction b. Fan continue to revolve even after switching.

B )

 Column-A Column-B i. Inertia of motion a. Fan continue to revolve even after switching. ii. Inertia of direction b. Passengers thrown opposite to the direction of turning.

Ans

 Column-A Column-B i. Inertia of motion a. Fan continue to revolve even after switching. ii. Inertia of direction b. Passengers thrown opposite to the direction of turning.

B )

48 ) An iron nail sinks in water but a massive ship floats on water due to liquid pressure.

A ) True

B ) False

Ans B ) False

49 ) Another term for relative density.

A ) Specific relativity

B ) Specific gravity

Ans B ) Specific gravity

50 ) The buoyant force is …………… if density of liquid is …………… .

A ) Greater, lesser

B ) Zero, lesser

C ) Lesser, greater

D ) Lesser, lesser

Ans D ) Lesser, lesser

51 ) The car stopping after the brakes are applied is an example of frictional force.

A ) True

B ) False

Ans A ) True

52 ) A force is expressed in magnitude and direction.

A ) True

B ) False

Ans A ) True

53 ) More the density of liquid, more is the force of buoyancy.

A ) True

B ) False

Ans A ) True

54 ) It is easy to cut vegetables with a sharp knife.

A ) False

B ) True

Ans B ) True

55 ) A force applied to a body through a direct contact of the objects or via one more object is called ……………

force.

A ) Contact

B ) Non-contact

C ) Balanced

Ans A ) Contact

56 ) While pulling a bucket from a well, it appears to be lighter when fully immersed in water than when it is pulled out of water.

A ) True

B ) False

Ans A ) True

57 ) The density of sea water is less than fresh water.

A ) False

B ) True

Ans A ) False

58 ) Acceleration of the car is an example of balanced forces.

A ) False

B ) True

Ans A ) False

59 ) The SI unit of force is dyne.

A ) False

B ) True

Ans A ) False

60 ) force is very useful in daily life.

A ) Magnetic

B ) Electrostatic

C ) Frictional

Ans C ) Frictional

61 ) The object floats if the buoyant force is smaller than its weight.

A ) False

B ) True

Ans A ) False

62 ) The tendency of an object to remain in its existing state is called its inertia.

A ) True

B ) False

Ans A ) True

63 ) Passenger sitting in running bus gets a jerk in forward direction if bus stops suddenly.

A ) True

B ) False

Ans A ) True

64 ) All objects in motion have frictional force acting on them.

A ) False

B ) True

Ans B ) True

65) When force is applied on the head of the nail, it is easy to hammer it into the plank.

A ) False

B ) True

Ans B ) True

66 ) Force cannot change the state of motion of an object.

A ) False

B ) True

Ans A ) False

67 ) Classify the following into contact and non-contact force.

A plastic ruler on being moved through dry hair, brought near pieces of paper.

A ) Contact force

B ) Non-contact force

Ans B ) Non-contact force

68 ) All gases and liquids have a common name ……………

A ) Mixtures

B ) Fluids

Ans B ) Fluids

69 ) Vegetable vendor keeps a twisted cloth above the head below the basket to reduce the pressure.

A ) True

B ) False

Ans A ) True

70 ) Muscular force is an example of non-contact force.

A ) True

B ) False

Ans B ) False

71 ) Balanced forces keep the body at rest.

A ) True

B ) False

Ans A ) True

72 ) When weight is kept on a solid, pressure is exerted on it.

A ) True

B ) False

Ans A ) True

73) At any one level, the liquid pressure is ……………

A ) Different

B ) Same

Ans B ) Same

74 ) As we go higher, atmospheric pressure …………… .

A ) Increases

B ) Decreases

C ) Remains same

D ) Initially decreases and then increases

Ans B ) Decreases

75 ) A force applied between two objects even if the two objects are not in contact is called force.

A ) Contact

B ) Non-contact

C ) Un-balanced

Ans B ) Non-contact

76 ) Air pressure: Atmospheric Pressure:: Upward force on object in water: ……………

A ) Buoyant force

B ) Specific gravity

Ans A ) Buoyant force

77 ) When a wooden block is pushed, the force acting on it is …………… .

A ) Electric

B ) Unbalanced

C ) Balanced

D ) Nuclear

Ans B ) Unbalanced

78 ) While walking, we don’t slip due to force acting in opposite direction.

A ) Muscular

B ) Frictional

C ) Gravitational

Ans B ) Frictional

79 ) Archimedes principle has been used in submarines.

A ) False

B ) True

Ans B ) True

80 ) When unequal forces are applied to the box on the two sides, a balanced force acts on the box.

A ) True

B ) False

Ans B ) False

81 ) An object can change its shape due to force.

A ) True

B ) False

Ans A ) True

82 ) A force is required to stop an object in motion.

A ) True

B ) False

Ans A ) True

83) When an object is dipped in a liquid, a buoyant force acts on it.

A ) True

B ) False

Ans A ) True

This site uses Akismet to reduce spam. Learn how your comment data is processed.