Force and Pressure Class 8 MCQ Questions

MCQ on Force and Pressure Class 8

Choose the correct answer.

Question 1.
A push or a pull is called
A) friction
B) pressure
C) force
D) none of these
Answer:
C) force

Question 2.
Hoisting a flag is related to
A) push
B) pull
C) push and pull both
D) pressure
Answer:
B) pull

Question 3.
A person is pulling water from well. Which type of force it is ?
A) Muscular force
B) Magnetic force
C) Friction force
D) Electrostatic force
Answer:
A) Muscular force

Question 4.
Let the forces F1 and F2 act on the table in opposite direction, F1 > F2
then Fnet = …………..
net
A) F1 + F2
B) F1 – F2
C) 0
D) 2F2 – F1
Answer:
B) F1 – F2

Question 5.
Which one of the following is an example for non contact force?
A) Pushing a table
B) Pressing toothpaste
C) Deflection of needle in compass
D) Lifting a bag
Answer:
C) Deflection of needle in compass

Question 6.
What is the direction of frictional force ?
A) Opposite to the motion of object
B) Upward
C) Downward
D) In the direction of force
Answer:
A) Opposite to the motion of object

Force and Pressure Class 8 MCQ Questions

Question 7.
When the object is freely falling what is the force acting on it?
A) Normal force
B) Frictional force
C) Gravitational force
D) None
Answer:
C) Gravitational force

Question 8.
A rubbed balloon attracts pieces of paper due to
A) Frictional force
B) Magnetic force
C) Electrostatic force
D) Gravitational force
Answer:
C) Electrostatic force

Question 9.
Force has
A) Direction
B) Magnitude only
C) Both A and B
D) None
Answer:
C) Both A and B

Question 10.
When the force acting on an object are equal in opposite direction, the object remains
A) Moves forward
B) backward
C) upwards
D) stationary
Answer:
D) stationary

Question 11.
An example for non – contact force is ___________
A) Normal force
B) Frictional
C) Muscular
D) Gravitational
Answer:
D) Gravitational

Question 12.
A force cannot change the ___________
A) speed of an object
B) mass
C) shape of object
D) direction of moving object
Answer:
B) mass

Force and Pressure Class 8 MCQ Questions

Question 13.
The force acting on unit area of a surface is called __________
A) momentum
B) density
C) pressure
D) velocity
Answer:
C) pressure

Question 14.
Pressure ________
A) Force
B) Force × Area
C) Area / Force
D) Force / Area
Answer:
D) Force / Area

Question 15.
The force of attraction between any two objects having mass is
A) frictional
B) muscular
C) gravitational
D) magnetic
Answer:
C) gravitational

Question 16.
If the area is less, then the value of pressure is ___________
A) less
B) more
C) does not change
D) none of these
Answer:
B) more

Question 17.
The direction of friction and the direction of motion are always _________
A) same
B) opposite
C) A or B
D) we can’t say
Answer:
B) opposite

Question 18.
When a balloon rubbed with plastic paper and brought near the pieces of paper. What is your observation ?
A) Balloon attracts pieces of paper
B) Balloon does not attract pieces of paper
C) Balloon is blow out
D) Increases size of the balloon
Answer:
A) Balloon attracts pieces of paper

Force and Pressure Class 8 MCQ Questions

Question 19.
P : Force has magnitude as well as direction.
Q : State of motion of a body can’t be changed by net force.
A) P False, Q True
B) P and Q are true
C) P and Q are false
D) P true, Q false
Answer:
D) P true, Q false

Question 20.
Unit of pressure is __________
A) N
B) N / meter
C) N/meter2
D) N. meter
Answer:
C) N/meter2

Question 21.
Which of the following forces are field forces ?
1) Magnetic forces
2) Electrostatic forces
3) Gravitational forces

A) Only 1
B) Only 2
C) Only 1 and 2
D) All 1, 2 and 3
Answer:
D) All 1, 2 and 3

Question 22.
Assertion (A) : A boy pushes the tyre again and again with a stick to increase its speed.
Reason (R) : If the net force acts in the direction of motion, the speed of an object moving with constant speed also increase.
A) A and R are true, R supports A
B) A and R are true, R doesn’t support A
C) A and R are false
D) A is true and R is false
Answer:
A) A and R are true, R supports A

Question 23.
Choose correct matching option.

Group A Group B
1) Gravitational force a) Horse pulling a cart
2) Frictional force b) Iron nails attracted
3) Electrostatic force c) Fruit falling from a tree
4) Magnetic force d) Heat is generated
5) Muscular force e) Bits of paper are raised

A) 1 – c, 2 – d, 3 – e, 4 – b, 5 – a
B) 1 – a, 2 – b, 3 – c, 4 – d, 5 – e
C) 1 – e, 2 – c, 3 – d, 4 – a, 5 – b
D) 1 – e, 2 – d, 3 – a, 4 – b, 5 – c
Answer:
A) 1 – c, 2 – d, 3 – e, 4 – b, 5 – a

Group A Group B
1) Gravitational force c) Fruit falling from a tree
2) Frictional force d) Heat is generated
3) Electrostatic force e) Bits of paper are raised
4) Magnetic force b) Iron nails attracted
5) Muscular force c) Fruit falling from a tree

Question 24.
Assertion (A): Magnetic force is a field force.
Reason (R) : A magnet can attract of repel another magnet with zero magnitude.
A) A and R are true
B) A and R are false
C) A is true, but R is false
D) A is false, but R is true
Answer:
C) A is true, but R is false

Force and Pressure Class 8 MCQ Questions

Question 25.
Take two balloons inflate them. Rub both with your hair. Bring them to closer to each other. Then they
A) Repels
B) Attracts
C) No change
D) We cannot say anything
Answer:
A) Repels

Question 26.
The net force in the diagram is
Force and Pressure Class 8 MCQ Questions 1
A) 8N
B) 16 N
C) 20 N
D) 4 N
Answer:
D) 4 N

Question 27.
Frictional force depends upon ____________
i) Normal force
ii) Gravitational force
iii) Area of contact
iv) Smoothness of surface

A) i, ii only
B) iii only,
C) i, ii and iv only
D) iv only
Answer:
C) i, ii and iv only

Question 28.
When two forces are acting in the same direction the resultant force is
A) sum of the forces
B) differences of forces
C) half of the fort es
D) zero
Answer:
A) sum of the forces

Question 29.
Effect of pressure depends upon _________
A) area of contact
B) force applied
C) frictional force
D) both A and B
Answer:
D) both A and B

Question 30.
Study the following table.

Case i ii iii iv
Force (N) 20 10 40 30
Area (m2) 0.5 0.2 0.8 0.3

In which case the pressure is more ?
A) i
B) ii
C) iii
D) iv
Answer:
B) ii

Force and Pressure Class 8 MCQ Questions

Question 31
Choose correct matching option.

Group A Group B
A) Electrostatic force i) Force
B) Force per unit area ii) Non contact force
C) Muscular force iii) Pressure
D) Push or pull on object iv) Contact force

A) a – ii, b – iv, c – i, d – iii
B) a – iii, b – i, c – iv, d – ii
C) a – ii, b – iii, c – iv, d – i
D) a – iv, b – iii, c – i, d – ii
Answer:
C) a – ii, b – iii, c – iv, d – i

Group A Group B
A) Electrostatic force ii) Non contact force
B) Force per unit area iii) Pressure
C) Muscular force iv) Contact force
D) Push or pull on object i) Force

Question 32.
Which of the following statements is correct about a force ?
A) It can be seen but it can’t be felt
B) It is needed to start an object moving.
C) It can change the shape of an object.
D) It can make moving object stop
Answer:
A) It can be seen but it can’t be felt

Question 33.
Pressure can be increased by
A) Increasing both the area and the force.
B) Decreasing the area and increasing the force.
C) Increasing the area arid decreasing the force.
D) Decreasing both the area and the force.
Answer:
B) Decreasing the area and increasing the force

Question 34.
Pressure exerted by a sharp needle on a surface is
A) More than the pressure exerted by a blunt needle.
B) Less than the pressure exerted by a blunt needle.
C) Equal to the pressure exerted by a blunt needle.
D) None of these.
Answer:
A) More than the pressure exerted by a blunt needle.

Question 35.
In the given experiment which type of force is represented ?
Force and Pressure Class 8 MCQ Questions 2
A) Magnetic
B) Electrostatic
C) Gravitational
D) Tension
Answer:
A) Magnetic

Question 36.
From the given figure, the force which is pulling the cart is
Force and Pressure Class 8 MCQ Questions 3
A) contact force
B) force at a distance
C) muscular force
D) A and C
Answer:
D) A and C

Force and Pressure Class 8 MCQ Questions

Question 37.
Force and Pressure Class 8 MCQ Questions 4
From the above diagram
The force exerted by one rubber band is F. Then the net force acting on your finger when four rubber bands are used is
A) F
B) 2F
C) 3F
D) 4F
Answer:
D) 4F

Question 38.
Force and Pressure Class 8 MCQ Questions 5
Directions of normal forces labelled at
A) a, b
B) c, d
C) c
D) a, c
Answer:
A) a, b

Question 39.
X, Y are the objects having same size and made with same material. A nail of 1 kg on X and a screw of 1 kg on Y are placed. On which object the pressure is more ?
Force and Pressure Class 8 MCQ Questions 6
A) On X
B) On Y
C) equal pressure on X and Y
D) Data is insufficient
Answer:
A) On X

Question 40.
Suresh placed a book on the table.
Suresh asked his Mend Mahesh, Why is the book in rest even though two forces are acting on the book ?
Then Mahesh replied that
A) Normal force and gravitational forces are equal and acting in same directions.
B) Normal force and gravitational forces are unequal and acting in opposite directions.
C) Normal force and gravitational forces are unequal and acting in same directions.
D) Normal force and gravitational forces are equal and acting in opposite directions.
Answer:
D) Normal force and gravitational forces are equal and acting in opposite directions.

Question 41.
What do you generalise from above information ?
A) Limiting force depends on colour of the threads.
B) Different strings have different limiting forces.
C) Natural fibres are strong.
D) All type of strings have same limiting force.
Answer:
B) Different strings have different limiting forces.

Question 42.
Rajesh inflated a balloon and tied up the open end. Now cut a paper into small pieces and place them on the floor. Rub the balloon with a paper and bring the balloon near the pieces of a paper”. What would you conclude from this experiment?
i) No need of physical contact for contact forces
ii) Balloon acquires -an electrostatic charge on its surface
iii) In field force there is no physical contact
A) ii only correct
B) i and ii only correct
C) ii and iii only correct
D) i only correct
Answer:
C) ii and iii only correct

Force and Pressure Class 8 MCQ Questions

Question 43.
We use sharper side of a knife to cut vegetables than the blunt side because
A) Blunt side has a smaller contact area
B) Sharper side has a smaller contact area
C) Sharper side exerts less pressure
D) Blunt side exerts more pressure
Answer:
B) Sharper side has a smaller contact area

Question 44.
Study the figure given below. At which point, the pressure is greater?
Force and Pressure Class 8 MCQ Questions 7
A) I
B) II
C) III
D) IV
Answer:
C) III

Question 45.
Which of the following table do you choose to make data interpretation?
Force and Pressure Class 8 MCQ Questions 8
Answer:
A)

S. No. Type of string length of the string Max limiting force

Question 46.
A student did a set of experiments using a balloon and a glass rod. In which of the following experiments will the balloon be attracted to the glass rod ?
A) Experiment 1 : Negatively charged balloon brought near a negatively charged glass rod.
B) Experiment 3 : Positively charged balloon brought near a positively charged glass rod.
C) Experiment 2 : Negatively charged balloon brought near a positively charged glass rod.
D) Experiment 4 : Neutral balloon brought near a neutral glass rod.
Answer:
C) Experiment 2 : Negatively charged balloon brought near a positively charged glass rod.

Question 47.
In the picture below, glass P is filled with water and has a plastic sheet placed over it. Glass Q is identical to glass P and is filled with an equal amount of water. Glass Q has a plastic sheet below it.
Force and Pressure Class 8 MCQ Questions 9
Which of the following is true about the atmospheric pressure acting on the two plastic sheets ?
A) The atmospheric pressure is greater on the sheet in P.
B) The atmospheric pressure is greater on the sheet in Q.
C) The atmospheric pressure is equal in P and in Q.
D) Cannot say as water is touching the plastic sheet in Q, but not in P.
Answer:
C) The atmospheric pressure is equal in P and in Q.

Question 48.
Which of the following, when filled inside a closed container, can exert pressure on the inner walls of the container ?
P : Solids
Q : Liquids
R : Gases

A) Only P
B) Only Q
C) Only P and Q
D) All P, Q and R
Answer:
D) All P, Q and R

Force and Pressure Class 8 MCQ Questions

Question 49.
Three students in a Physics class were discussing the nature of forces. This is what they said :
Dinesh : a force may be a contact or a non-contact force.
Pradeep : a force can be measured as it has a magnitude.
Farhad : a force acts in a particular direction.

Who is correct ?
A) Only Dinesh
B) Only Dinesh and Pradeep
C) Only Dinesh and Farhad
D) All – Dinesh, Pradeep and Farhad
Answer:
D) All – Dinesh, Pradeep and Farhad

Fill in the blanks.

1. Force could be a ………………… .
Answer:
push or a pull

2. A ………………… arises due to the interaction between two objects.
Answer:
Force

3. Force has ………………… as well as ………………… .
Answer:
magnitude, direction

4. A change in the ………………… of an object or the ………………… of its motion or both implies a
change in its state of motion.
Answer:
Speed, direction

5. Force acting on an object may cause a change in its ………………… or a change in its ………………… .
Answer:
state of motion, shape

6. A ………………… can act on an object with or without being in contact with it.
Answer:
force

Force and Pressure Class 8 MCQ Questions

7. Force per unit area is called ………………… .
Answer:
pressure

8. ………………… and ………………… exert pressure on the walls of their containers.
Answer:
Liquids, gases

9. The pressure exerted by air around us is known as ………………… .
Answer:
atmospheric pressure

10. Force/ area = ………………… .
Answer:
pressure

11. Like pole of magnets ………………… each other.
Answer:
repels

12. ………………… causes to fall down the fruits from the trees.
Answer:
Gravity

13. If the area of contact increases pressure ………………… .
Answer:
decreases

14. Any moving object slows down due to ………………… force.
Answer:
frictional

Force and Pressure Class 8 MCQ Questions

15. Shape of an object can be changed by applying ………………… on it.
Answer:
force

16. Fill up the blanks with suitable words to complete the given statement. Air moves from ………………… pressure region to ………………… pressure region.
Answer:
high, low

17. The force acting on a body can change its ………………… .
Answer:
shape

18. The S.I. unit of pressure is ………………… .
Answer:
Pascal

III. Match the following.

Question 1.

Group – A Group – B
P) contact force i) friction
Q) non-contact force ii) gravity
iii) pressure

Answer:
P – i, Q – ii

Group – A Group – B
P) contact force i) friction
Q) non-contact force ii) gravity

Question 2.

Group – A Group – B
P) contact force i) reading a book by a boy
Q) non-contact force ii) pulling a nail by a magnet
iii) pulling a cart by porter

Answer:
P – iii, Q – ii

Group – A Group – B
P) contact force iii) pulling a cart by porter
Q) non-contact force ii) pulling a nail by a magnet

Force and Pressure Class 8 MCQ Questions

Question 3.

Group – A Group – B
P) pull i) climbing a rope
Q) push ii) reading a book
iii) bowling a ball

Answer:
P – i, Q – iii

Group – A Group – B
P) pull i) climbing a rope
Q) push iii) bowling a ball

Question 4.

Group – A Group – B
P) preparing a paper boat i) changing in motion
Q) hitting a ball with a bat ii) changing in direction
iii) changing in shape

Answer:
P – iii, Q – ii

Group – A Group – B
P) preparing a paper boat iii) changing in shape
Q) hitting a ball with a bat ii) changing in direction

Question 5.

Group – A Group – B
P) pulling a door i) gravity
Q) falling a leaf from a tree ii) friction
iii) muscular force

Answer:
P – iii, Q – i

Group – A Group – B
P) pulling a door iii) muscular force
Q) falling a leaf from a tree i) gravity

Question 6.

Group – A Group – B
P) pull or push i) pressure
Q) force per unit area ii) friction
iii) force

Answer:
P – iii, Q – i

Group – A Group – B
P) pull or push iii) force
Q) force per unit area i) pressure

Force and Pressure Class 8 MCQ Questions

Question 7.

Group – A Group – B
P) nail pointed edge i) to increase pressure
Q) porters wearing turban (talapaga) ii) to reducing pressure
iii) to reduce force

Answer:
P – i, Q – ii

Group – A Group – B
P) nail pointed edge i) to increase pressure
Q) porters wearing turban (talapaga) ii) to reducing pressure

8th Class Physical Science Bit Bank

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