NCERT Class 8 Science Chapter 11 Force and Pressure Extra Questions and Answers
Class 8 Science Chapter 11 Extra Questions and Answers – Force and Pressure. Here in this Page Class VIII Students can Learn Extra Questions & Answer 11th Chapter Science fully Inside.
We Provided Here Force and Pressure Science Chapter 11 Long Answer Type Question, Very Short Type Questions (VSA) / MCQ Type Questions, Short Type Questions (SA).
1) Fill in the blanks:
a) Muscular force is ____ force. (Contact)
b) Force per unit area is called ____. (Pressure)
c) To move a tire faster it has to be ____ repeatedly. (Pushed)
2) Multiple choice questions:
a) The rope may not move if the two teams ____ at it with equal force?
a) Pull b) Push
Ans. a) Pull
b) Gases exert ____ on the walls of their container?
a) Friction b) Pressure
Ans. b) Pressure
c) An interaction of one object with another object results in a ____ between the two objects?
a) Friction b) Force
Ans. b) Force
3) Answer the following questions:
a) What is force? How does the speed of an object depend on the force?
Ans. A push or a pull on an object is called a force.
If the force applied on the object is in the direction of its motion, the speed of the object increases. On the other hand, if the force applied on the object is in the direction opposite to the direction of motion, the speed of the object decreases.
b) What is muscular force? Write a function of muscular force.
Ans. The force resulting due to the action of muscles is known as the muscular force.
Muscular force enables us in movement or bending of our body.
c) Write two functions of gravitational force.
Ans. i) Objects or things fall towards the earth for gravitational force.
ii) Water in rivers flows downwards due to the gravitational force.
d) What is atmospheric pressure? Why we are not crushed under the force of gravity?
Ans. The pressure exerted by the air around us is known as atmospheric pressure.
The reason we are not crushed under the force of gravity is that the pressure inside our bodies is also equal to the atmospheric pressure and balances the pressure from outside.
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e) How the state of motion is described? What are the states of motion of an object?
Ans. The state of motion of an object is described by its speed and the direction of motion.
An object may be at rest or in motion, both are its states of motion.
4) Mark your answer as per the codes provide below:
a) A: The force of friction is an example of contact force.
R: The force of friction arises due to the contact between surfaces.
I.) Both A and R are true and R is the correct explanation of A.
II.) Both A and R are true but R is not the correct explanation of A.
III.) A is true but R is false.
IV.) A is false but R is true.
V.) Both A and R are false.
Ans. I. Both A and R are true and R is the correct explanation of A.
b) A: Electrostatic force is an example of a non-contact force.
R: Electrostatic force comes into play even when the bodies are not in contact.
I.) Both A and R are true and R is the correct explanation of A.
II.) Both A and R are true but R is not the correct explanation of A.
III.) A is true but R is false.
IV.) A is false but R is true.
V.) Both A and R are false.
Ans. I. Both A and R are true and R is the correct explanation of A.
5) The force responsible for charging the state of motion of objects is known as the force of friction. For example, Friction between water and the boat brings it to a stop once you stop rowing. The force of friction always acts on all the moving objects and its direction is always opposite to the direction of motion. Since the force of friction arises due to the contact between surfaces, it is an example of a contact force.
a) The force of friction is an example of ____ force. (Contact)
b) The force responsible for charging the state of motion of objects is known as ____. (The force of friction)
c) The direction of the force of friction is always ____ to the direction of motion.(Opposite)
More extra Questions & Answers
1] fill in the blanks given below
1] a force can bring a change in state of motion of an object.
2] the force acting on an unit area of a surface is called pressure.
3] the force resulting due to the action of muscle is known as muscular force.
4)Push or pull on an object Is called a Force.
5)The pressure exerted by air is known as atmospheric pressure.
2] say whether the following statements are true or false
1) Liquid and gas Does not exert pressure on the walls of container.
False
2)Force on an object may change its shape.
True
3)The strength of a force is expressed by unit joule.
False
4)The force responsible for changing state of motion is force of displacement.
False
Q.3) Define following terms
1)Force
Ans.Push or pull on an object is called Force.
2)Magnitude
Ans.The strength of a force is usually expressed by its magnitude.
3) Pressure
Ans. The force acting on a unit area of a surface is called pressure.
Q.4)Answer the following
1) Define : Electrostatic force
Ans. The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.
2) Explain the term pressure with its formula.
Ans.The force acting on an unit area of a surface is called pressure.
Formula : Pressure =Force(F) / Area on which it acts.
3) Define term atmospheric pressure.
Ans.i) The atmospheric air extends up to many kilometres above the surface of the earth.
ii)The pressure exerted by air is known as atmospheric pressure.
4)Define term Force of gravity.
Ans. Objects or things fall towards the earth because it pulls them. This force is called Force of gravity.
5)What is gravitational force ?
Ans. Every object in the universe, whether small or large exerts a force on every object. This force is known as Gravitational force.
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