Exploring Forces from Class 8 Science Chapter 5 highlights force, effects of force, interaction, contact and non-contact forces, friction, magnetic force, electrostatic force, gravitational force, weight, mass, spring balance, and buoyant force.
This set of match-the-following questions will help in the revision of the chapter.
Do have a look at Class 8 Science MCQ Questions and Answers.
Exploring Forces Class 8 Science Chapter 5 MCQ Online Test Questions and Answers
Question 1. In science, force is generally defined as:
a) Energy stored in an object
b) A push or pull applied on an object
c) The weight of an object only
d) The speed of a moving object
Answer:
b) A push or pull applied on an object
Question 2. Which of the following is not an effect of force?
a) Making an object move from rest
b) Changing the speed of a moving object
c) Changing the direction of motion
d) Changing the chemical composition of every object
Answer:
d) Changing the chemical composition of every object
Question 3. If a fielder stops a moving ball, the force applied mainly causes:
a) Increase in the speed of the ball
b) Change in colour of the ball
c) Stopping or decreasing the speed of the ball
d) Increase in the mass of the ball
Answer:
c) Stopping or decreasing the speed of the ball
Question 4. Pressing an inflated balloon is an example where force changes the:
a) Temperature of the balloon
b) Shape of the balloon
c) Colour of the balloon
d) Mass of the balloon
Answer:
b) Shape of the balloon
Question 5. A force comes into play only when:
a) One object is moving
b) Two or more objects interact
c) An object is very heavy
d) A machine is used
Answer:
b) Two or more objects interact
Question 6. The SI unit of force is:
a) Joule
b) Pascal
c) Newton
d) Kilogram
Answer:
c) Newton
Question 7. If an object remains at rest, it may still be under the action of forces that are:
a) Unequal
b) Balanced
c) Magnetic only
d) Always absent
Answer:
b) Balanced
Question 8. Muscular force is called a contact force because it acts only when there is:
a) Electrical charge
b) Physical contact
c) A magnetic field
d) Gravitational pull
Answer:
b) Physical contact
Question 9. Which of the following is an example of muscular force?
a) A magnet attracting iron pins
b) A child lifting a school bag
c) A balloon attracting paper pieces
d) A fruit falling from a tree
Answer:
b) A child lifting a school bag
Question 10. Friction acts on an object in a direction:
a) Same as the direction of motion
b) Opposite to the direction of motion
c) Vertically upward always
d) Towards the centre of Earth always
Answer:
b) Opposite to the direction of motion
Question 11. A ball rolling on a flat ground stops after some time mainly because of:
a) Magnetic force
b) Friction
c) Electrostatic force
d) Buoyant force
Answer:
b) Friction
Question 12. Friction arises due to:
a) The colour difference between surfaces
b) Irregularities in the surfaces in contact
c) The mass of the moving object only
d) The temperature of the air only
Answer:
b) Irregularities in the surfaces in contact
Question 13. Friction is generally greater on:
a) Smooth surfaces
b) Rough surfaces
c) Wet air only
d) Magnetic materials only
Answer:
b) Rough surfaces
Question 14. The force of friction between an object and a surface depends on the:
a) Shape of the Sun
b) Nature of the surfaces in contact
c) Colour of the object
d) Time of the day
Answer:
b) Nature of the surfaces in contact
Question 15. Friction in air and water can be reduced in aeroplanes and boats by giving them:
a) Brighter colours
b) Specific streamlined shapes
c) Greater mass
d) Rough outer surfaces
Answer:
b) Specific streamlined shapes
Question 16. Which of the following is a non-contact force?
a) Muscular force
b) Frictional force
c) Magnetic force
d) Push by hand
Answer:
c) Magnetic force
Question 17. When two like poles of magnets are brought close to each other, they:
a) Attract each other
b) Repel each other
c) Lose magnetism
d) Show no effect
Answer:
b) Repel each other
Question 18. The force exerted by a magnet on another magnet or magnetic material is called:
a) Gravitational force
b) Muscular force
c) Magnetic force
d) Frictional force
Answer:
c) Magnetic force
Question 19. Static charges are produced when certain materials are:
a) Heated strongly
b) Rubbed together
c) Kept in water
d) Exposed to sunlight
Answer:
b) Rubbed together
Question 20. A charged plastic scale can attract small paper pieces due to:
a) Magnetic force
b) Electrostatic force
c) Frictional force only
d) Buoyant force
Answer:
b) Electrostatic force
Question 21. Two balloons rubbed with a woollen cloth repel each other because they acquire:
a) Opposite charges
b) Similar charges
c) No charges
d) Magnetic poles
Answer:
b) Similar charges
Question 22. A rubbed balloon and the woollen cloth attract each other because they acquire:
a) Similar charges
b) Opposite charges
c) Equal masses
d) Magnetic force
Answer:
b) Opposite charges
Question 23. The two kinds of static charges mentioned in the chapter are:
a) North and South
b) Heavy and light
c) Positive and negative
d) Hard and soft
Answer:
c) Positive and negative
Question 24. The force with which the Earth attracts objects towards itself is called:
a) Magnetic force
b) Gravitational force
c) Electrostatic force
d) Muscular force
Answer:
b) Gravitational force
Question 25. Gravitational force is always:
a) Repulsive
b) Attractive
c) Sometimes attractive and sometimes repulsive
d) Equal to friction
Answer:
b) Attractive
Question 26. When an object is thrown vertically upward, its speed while going up:
a) Increases continuously
b) Remains constant
c) Decreases till it stops momentarily
d) Becomes zero immediately after leaving the hand
Answer:
c) Decreases till it stops momentarily
Question 27. The force with which the Earth pulls an object towards itself is called the object’s:
a) Mass
b) Density
c) Weight
d) Volume
Answer:
c) Weight
Question 28. The SI unit of weight is:
a) Kilogram
b) Gram
c) Newton
d) Metre
Answer:
c) Newton
Question 29. A spring balance measures:
a) Temperature
b) Weight or force
c) Volume only
d) Density only
Answer:
b) Weight or force
Question 30. If one small division on a spring balance represents 0.2 N, then this value is the:
a) Range of the instrument
b) Maximum capacity of the instrument
c) Least count of the instrument
d) Mass of the spring
Answer:
c) Least count of the instrument
Question 31. Mass of an object remains the same at every place, but weight may change because weight depends on:
a) Colour of the object
b) Gravitational force
c) Material of the spring balance
d) Temperature of the room
Answer:
b) Gravitational force
Question 32. When an object is placed in a liquid, the upward force applied by the liquid is called:
a) Friction
b) Upthrust or buoyant force
c) Muscular force
d) Electrostatic force
Answer:
b) Upthrust or buoyant force
Question 33. An object sinks in a liquid when:
a) Buoyant force is greater than gravitational force
b) Gravitational force is greater than buoyant force
c) Both forces are equal
d) There is no force acting on it
Answer:
b) Gravitational force is greater than buoyant force
Question 34. An object floats in a liquid when:
a) Gravitational force is always zero
b) Buoyant force is equal to the gravitational force
c) There is no friction in the liquid
d) Its mass becomes zero
Answer:
b) Buoyant force is equal to the gravitational force
Question 35. Which of the following statements is correct?
a) All non-contact forces are repulsive
b) Friction acts in the direction of motion
c) Magnetic and electrostatic forces may be attractive or repulsive
d) Weight and mass always have the same unit
Answer:
c) Magnetic and electrostatic forces may be attractive or repulsive
Question 36 – Match the Following
| Column A | Column B |
|---|---|
| 1. Muscular force | A. A compass needle pointing North |
| 2. Magnetic force | B. A child lifting a school bag |
| 3. Frictional force | C. A fruit falling from a tree |
| 4. Gravitational force | D. Balloon rubbed on woollen cloth attracting hair strands |
| 5. Electrostatic force | E. A cricket ball stopping on its own just before touching the boundary line |
Answer:
| Column A | Correct Answer |
|---|---|
| 1. Muscular force | B. A child lifting a school bag |
| 2. Magnetic force | A. A compass needle pointing North |
| 3. Frictional force | E. A cricket ball stopping on its own just before touching the boundary line |
| 4. Gravitational force | C. A fruit falling from a tree |
| 5. Electrostatic force | D. Balloon rubbed on woollen cloth attracting hair strands |
Question 37 – Match the Following
| Column A | Column B |
|---|---|
| 1. Force | A. Upward force by a liquid |
| 2. Weight | B. Amount of matter in an object |
| 3. Mass | C. Push or pull on an object |
| 4. Spring balance | D. Force with which Earth pulls an object |
| 5. Buoyant force | E. Instrument used to measure weight |
Answer:
| Column A | Correct Answer |
|---|---|
| 1. Force | C. Push or pull on an object |
| 2. Weight | D. Force with which Earth pulls an object |
| 3. Mass | B. Amount of matter in an object |
| 4. Spring balance | E. Instrument used to measure weight |
| 5. Buoyant force | A. Upward force by a liquid |
True or False type Questions for Class 8 Science Chapter 5 “Exploring Forces”
7 true or false questions based on Chapter 5, “Exploring Forces,” of the NCERT Science book for Class 8:
1. A force can change only the speed of an object, but not its direction or shape.
Answer:
False
2. For a force to come into play, at least two objects must interact in some way.
Answer:
True
3. Friction always acts in the same direction in which an object is moving.
Answer:
False
4. Magnetic force is a non-contact force because a magnet can act from a distance.
Answer:
True
5. Two similarly charged balloons attract each other when brought close together.
Answer:
False
6. The weight of an object may change from one planet to another, but its mass remains the same.
Answer:
True
7. If the buoyant force on an object is equal to its weight, the object sinks to the bottom of the liquid.
Answer:
False
Fill in the Blanks Questions for Class 8 Science Chapter 5 “Exploring Forces”
7 fill-in-the-blank questions based on Chapter 5, “Exploring Forces,” of the NCERT Science book for Class 8 –
1. A push or pull applied on an object is called ______ in science.
Answer:
force
2. The SI unit of force is ______.
Answer:
newton
3. The force that opposes the motion of an object moving over a surface is called ______.
Answer:
friction
4. The force exerted by a charged body on another charged or uncharged body is called ______ force.
Answer:
electrostatic
5. The force with which the Earth attracts objects towards itself is called ______ force.
Answer:
gravitational
6. The force with which the Earth pulls an object towards itself is known as its ______.
Answer:
weight
7. The upward force applied by a liquid on an object is called ______ force.
Answer:
buoyant
