Force and Pressure Class 8 Quiz Question with Answer
Force and Pressure Class 8 Quiz Question with Answer. CBSE Class 8 Science Lesson 11 Mock Test.
1) What is the unit of force?
A) Newton
B) Kilogram
C) Metre
D) pascal
Solution (A) Newton
Explanation: The S.I. unit of force is Newton and it is symbolize by (N).
2) The strength of force measured by its _____________.
A) Pressure
B) Magnitude
C) Friction force
D) All of these
Solution (B) Magnitude
Explanation: the strength of force is frequently expressed by its magnitude.
3) Moving a book placed on table, we use which type of force?
A) Push
B) Pull
C) Both (a) and (b)
D) Flying
Solution: (C) Both (a) and (b)
Explanation: we push and pull the book to move a book on a table; hence option [C] is correct.
4) Which of the following instrumentation is used to measure atmospheric pressure?
A) Calorimeter
B) Barometer
C) Spectrometer
D) All of the above
Solution (B) Barometer
Explanation: Barometer is used to measure the atmospheric pressure.
5) Force is _____ proportional to pressure.
A) Inversely
B) Directly
C) Indirectly
D) None of these
Solution (B)
Explanation: force is directionally proportional to the pressure and P= F/A/
6) Force of friction is an example of which of the following?
A) Contact
B) Non-contact
C) Both (a) and (b)
D) None of these
Solution (A) Contact
Explanation: force of friction is an example of a contact force, this force can be applied only when it is in contact with an object, and hence answer will be option {A}
7) Magnetic force is an example of ______________.
A) Contact force
B) Non-contact force
C) Both (A) and (B)
D) None of these
Solution: (B) Non-contact force
Explanation:: magnetic force is an example of non-contact force, the force can act on a magnet without being in contact with it, Hence answer will be option [B].
8) An apple falls on the ground from the tree due to which of the following force?
A) Force of friction
B) Force of gravity
C) Muscular force
D) Magnetic force
Solution (B) Force of gravity
Explanation: apple falls on the ground from a tree due to the force of gravity, whether small or large, exerts a force on every other object; this is known as gravitational force.
9) The S.I. unit of pressure is ___________
A) Newton
B) Pascal
C) Metre
D) Celsius
Solution (B) Pascal
Explanation: Pascal is a S.I. unit of pressure.
10) Which of the following statements is incorrect?
A) Magnetic force is a contact force.
B) Pascal is the unit of force.
C) Force of gravity is a contact force.
D) All of these
Solution: (D) All of these
Explanation: Here all, the statement ,because magnetic force is non-contact force, Pascal is the unit of pressure, force of gravity is a gravitational force, hence, all of these statements are incorrect.
11) We apply force on ____ while we lump dough on a plate.
A) Hand
B) Ground
C) Legs
D) Object
Solution: (A) Hand
Explanation: we apply force on hand to press it down, during lump dough on a plate.
12) Which of the following forces is a non contact force?
A) Force of gravity
B) Force of friction
C) Both (A) and (B)
D) None of the above
Solution: (A) Force of gravity
Explanation: force of gravity is a non-contact force while force of friction is a contact force, so option [A] is the correct option.
13) Which of the following pair is incorrect?
A) Pascal – unit of Force
B) Newton – unit of force
C) Barometer – measures pressure
D) Pressure increases – contact force
Solution: (A) Pascal – unit of Force
Explanation: all the pair is correct except option (A) because Pascal is a S.I. unit of pressure, hence option [A] is an incorrect pair.
14) Which of the following statements is incorrect?
A) A dropper works on the existence of atmospheric pressure.
B) Pressure is produced when a force act on an object
C) A force can change the shape and size of an object
D) Muscular force is an example of non-contact force.
Solution: (D) Muscular force is an example of non-contact force
Explanation: out of the given statement option [D] is an incorrect statement because it is an example of contact force while other statements are correct, only option [D] is incorrect.
15) The example of force of gravity is?
A) A ball falling on a ground
B) A fruit falling on a ground after ripping
C) A boy jumping on swimming pool
D) All of these
Solution: (D) All of these
Explanation: all are examples of force of gravity; hence option [D] is the correct answer.
16) A child riding a bicycle is due to which type of force?
A) Muscular force
B) Gravitational force
C) Electrostatic force
D) Magnetic force
Solution: (A) Muscular force
Explanation: a child riding a bicycle is due to muscular force, a child use a muscular force to carry out riding a bicycle, while other gravitational and electrostatic, magnetic force is an example of non-contact force.
17) Atmospheric pressure is exerted by which of the following factor?
A) Pushing
B) Pulling
C) Air
D) None of these
Solution: (C) Air
Explanation: Atmospheric pressure is exerted by atmospheric air around us, it is not exerted by pushing or pulling.
18) Electric force is also called ________Force.
A) Non-contact
B) Contact
C) Magnetic
D) frictional
Solution: (A) Non-contact
Explanation: electrostatic force is also called non-contact force, they pull or push on objects without touching them. It attracts the object which does not require that object in physical contact with each other.
19) Force changes the ______ object.
A) Shape
B) Size
C) Both (A) and (B)
D) None of these
Solution: (C) Both (A) and (B)
Explanation: force changes the shape and size of the object, hence answer will be option (C) .