CBSE Class 8 Science Chapter 8 Force And Pressure Question And Answers

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CBSE Class 8 Science Chapter 8 Force And Pressure Fill In The Blanks

Question 1. To draw water from a well, we have to use the _____________ rope.
Answer: Pull

Question 2. A charged body _____________ an uncharged body.
Answer: Attracts

Question 3. To move a loaded trolley, we have to do it.
Answer: Push

Question 4. The north pole of a magnet _____________ the north pole of another magnet.
Answer: Repels

Read And Learn More CBSE Class 8 Science Question And Answers

Question 5. An archer stretches her bow while aiming at the target. She then releases the arrow, which begins to move towards the target. Based on this information, fill up the gaps in the following statements using the following terms: muscular, contact, non-contact, gravity, friction, shape, attraction

Question 6. To stretch the bow, the archer applies a force that causes a change in its ___________.
Answer: shape

Question 7. The force applied by the archer to stretch the bow is an example of a ___________ force.
Answer: muscular

Question 8. The type of force responsible for a change in the state of motion of the arrow is an example of a ___________ force.
Answer: Contact

Question 9. While the arrow moves towards its target, the forces acting on it are due to ___________ and that due to the ___________ of air.
Answer: Gravity, friction.

Question 10. The ____________ the area, the larger the pressure on a surface.
Answer: Smaller

Question 11. A cyclist exerts a force of ____________ on the pedal of the cycle.
Answer: Push

Question 12. When two forces act in the same direction, then the net force acting is ____________ of the two forces.
Answer: Sum

Question 13. The force that acts when two objects are in actual contact is called _the ___________ force.
Answer: Contact

Question 14. Halting of the moving ball on its own is an example of ____________ force.
Answer: Frictional

Question 15. As we go high on the mountain, the ____________ decreases.
Answer: Pressure

Question 16. If the force is applied on a smaller area of contact, then the pressure exerted by it ____________.
Answer: Increases

Question 17. Draper and rubber sucker work on the principle of ____________ pressure.
Answer: Atmospheric

Question 18._________ is an example of contact force.
Answer: Frictional Force

Question 19. When you kick a ball with your leg, you exert _______ force.
Answer: Muscular

Question 20. _______ is the device used to measure atmospheric Pressure.
Answer: Barometer

CBSE Class 8 Science Chapter 8 Force And Pressure True Or False

Question 1. If two forces act in opposite directions, then the net force is the difference between the two forces.
Answer: True

Question 2. In ‘tug of war’, when both teams apply equal pulling force, then the net force is maximum.
Answer: False

Question 3. The force between two electric charges is called the magnetic force.
Answer: False

Question 4. Muscular force and frictional force are examples of non-contact forces.
Answer: False

Question 5. The force per unit area is the pressure on that area.
Answer: True

Question 6. The nails penetrated the planks easily because a large force acts on a small area.
Answer: True

Question 7. Water comes out more slowly from an upstairs tap than from a similar downstairs tap.
Answer: True

Question 8. The blood pressure in our body balances the atmospheric pressure acting on our body.
Answer: True

Question 9. The SI unit of pressure is the newton.
Answer: False

Question 10. Pressure is defined as the force per unit length.
Answer: False

Question 11. A liquid exerts pressure in all directions.
Answer: True

CBSE Class 8 Science Chapter 8 Force And Pressure Match The Columns

Question 1. Match Column 1 with Column 2.

Match Column 1 with Column 2.

Answer: (a)-(4), (b)-(3), (c)-(1), (d)-(2), (e)-(6), (f)-(5)

CBSE Class 8 Science Chapter 8 Force And Pressure

The following questions consist of two statements: Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below

  1. Both A and R are true, and R is the correct explanation of A.
  2. Both A and R are true, but R is not the correct explanation of A.
  3. A is true, but R is false.
  4. A is false, but R is true.

Question 1.

Assertion (A) A Push or pull on an object is called a force.
Reason (R) Forces add together if they are applied in opposite directions.

Answer: 3. A is true, but R is false because forces applied in the same direction add together.

Question 2.

Assertion (A) In the game of tug of war, sometimes the rope does not seem to move to any side even if strong forces are applied from both sides.
Reason (R): Equal forces applied from opposite sides on an object make the net applied force zero.

Answer: 1. Both statements are correct. If the net force on a body is zero, then it does not move. Hence, the correct option is (a).

Question 3.

Assertion (A): Electrostatic force is a contact force.
Reason (R) The force exerted by a charged body on another charged body is known as the electrostatic force.

Answer: 4. A is false because electrostatic force is a non-contact force. Hence, option (d) is correct.

Question 4.

Assertion (A) The larger the area, the smaller the pressure.
Reason (R) The force acting on a unit area of a surface is called pressure.

Answer: 1. According to the definition of pressure,

⇒ \(\text { Pressure }=\frac{\text { Force }}{\text { Area }} \Rightarrow \text { Pressure } \propto \frac{1}{\text { Area }}\)

Both statements are correct. Hence, option (a) is correct

CBSE Class 8 Science Chapter 8 Force And Pressure Assertion-Reason Questions And Answers

The following questions consist of two statements Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.

  1. Both A and R are true, and R is the correct explanation of A.
  2. Both A and R are true, but R is not the correct explanation of A
  3. A is true, but R is false.
  4. A is false, but R is true.

Question 10.

  1. Assertion (A) Fruit falls on the ground when it gets detached from the tree.
  2. Reason (R) The force responsible for this action is the electrostatic force.

Answer: 3. A is true, but R is false.

Question 11.

  1. Assertion (A) A football rolling along the ground gradually slows down and finally comes to rest.
  2. Reason (R) This happens due to the force of friction between the ball and the ground.

Answer: 1. Both A and R are true, and R is the correct explanation of A.

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