CBSE Class 8 Science Chapter 05 Exploring Forces MCQs Set 03

Multiple Choice Questions (MCQs) for Class 8 Science: Chapter 05 Exploring Forces

Explore reliable objective questions for Chapter 05 Exploring Forces tailored for Class 8 learners. Utilizing these Science multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.

Practice Chapter 05 Exploring Forces MCQs for Class 8 Science

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Question: When Sonali and Ragini encountered wind while cycling through the village, why did Sonali say they had to push their pedals harder to move faster?
A. The wind was helping them move forward
B. They were riding against the direction the wind was blowing
C. The wind reduced the friction on their bicycles
D. The wind increased their bicycles' weight
Show Answer & Explanation

Answer: (B) They were riding against the direction the wind was blowing

Explanation:
The chapter states that when riding against the wind, they had to push harder to move faster, indicating that the wind force was opposing their motion.

Question: In the context of forces discussed in section 5.1, which of the following best describes what happens when you apply a push or pull to move a cardboard box?
A. The box moves without any force interaction
B. A force is being applied on the object to change its state of motion
C. Only contact with the box is necessary, force is not involved
D. The box moves due to gravity alone
Show Answer & Explanation

Answer: (B) A force is being applied on the object to change its state of motion

Explanation:
Force is fundamentally a push or pull applied on an object, and in this activity the application of push or pull causes the box to move.

Question: Based on Activity 5.2's analysis of different actions and their effects, which scenario demonstrates a force causing a change in the shape of an object rather than its motion?
A. A friend holding a moving bicycle from behind to stop it
B. Hitting a moving ball with a bat to change its direction
C. Pressing an inflated balloon with hands
D. Applying brakes on a moving bicycle
Show Answer & Explanation

Answer: (C) Pressing an inflated balloon with hands

Explanation:
When you press an inflated balloon, the force deforms its shape without necessarily causing it to move to a different location—this is a change in shape rather than motion.

Question: In section 5.3, the chapter explains that forces result from interactions between objects. Which statement best reflects this concept?
A. A single object can produce a force without interacting with anything else
B. Your hand pushing a table means only your hand experiences a force
C. At least two objects must interact for a force to come into play
D. Forces can act on objects that are completely isolated from their surroundings
Show Answer & Explanation

Answer: (C) At least two objects must interact for a force to come into play

Explanation:
• The chapter states that at least two objects must interact for a force to come into play
• Force results from the object's interaction with another object
• When you push a table, your hand and the table are two objects interacting with each other

Question: Which of the following best explains why muscular force is classified as a contact force?
A. It can act at a distance like magnetic force
B. It requires direct or indirect physical contact between the body and the object being moved
C. It is generated by electricity inside muscles
D. It always works without any physical interaction
Show Answer & Explanation

Answer: (B) It requires direct or indirect physical contact between the body and the object being moved

Explanation:
Muscular force is a contact force because it either uses direct contact through hands or other body parts, or indirect contact through tools like sticks or ropes to apply force on objects.

Question: In Activity 5.3, when an object is gently pushed and then stops sliding across a table, what does the chapter identify as the invisible force responsible for this stopping action?
A. Gravitational force pulling downward
B. Magnetic attraction from the table
C. Friction arising between the surfaces in contact
D. Electrostatic force from air particles
Show Answer & Explanation

Answer: (C) Friction arising between the surfaces in contact

Explanation:
The chapter explains that the object stops due to friction—a force acting between the sliding object and the table surface in a direction opposite to the motion.

Question: When comparing friction on different surfaces in Activity 5.4, the object stops at different distances on glass, cloth, wood, ceramic, and sand. What does this observation reveal about friction?
A. Friction is identical on all surfaces
B. Friction depends on the nature and texture of the surfaces in contact
C. Friction only acts on rough surfaces
D. The object's weight changes on different surfaces
Show Answer & Explanation

Answer: (B) Friction depends on the nature and texture of the surfaces in contact

Explanation:
The chapter clearly states that friction is greater on rough surfaces and depends upon the nature of the surfaces in contact, which is why the object travels different distances before stopping on each type of surface.

Question: In Activity 5.5, when two ring magnets with like poles facing each other are positioned vertically on a stick, why does the upper magnet remain suspended in air rather than falling?
A. Gravitational force is absent at that location
B. The repulsive magnetic force between like poles balances the downward gravitational force
C. The upper magnet is lighter than air
D. Friction from the stick supports the magnet
Show Answer & Explanation

Answer: (B) The repulsive magnetic force between like poles balances the downward gravitational force

Explanation:
Like poles of magnets repel each other, creating an upward force that counteracts the downward pull of gravity, causing the magnet to levitate.

Question: In section 5.4.2, the chapter describes electrostatic force demonstrated in Activity 5.6 with a plastic scale rubbed with polythene attracting paper pieces. What essential characteristic makes this a non-contact force?
A. It requires the scale to physically touch the paper
B. It can affect objects without direct physical contact between them
C. It only works on charged objects
D. It is weaker than contact forces
Show Answer & Explanation

Answer: (B) It can affect objects without direct physical contact between them

Explanation:
The paper pieces are attracted to the charged scale and stick to it without the scale touching them, demonstrating that electrostatic force acts over a distance without contact.

Question: When two balloons rubbed with a woollen cloth are brought near each other in Activity 5.7, they repel and move away. When the same cloth is brought near one of the charged balloons, they attract. What does this reveal about electrical charges?
A. All charged objects repel each other
B. Similar charges repel while opposite charges attract
C. Charge only exists on balloons, not on cloth
D. Attraction and repulsion have nothing to do with charge types
Show Answer & Explanation

Answer: (B) Similar charges repel while opposite charges attract

Explanation:
• Two balloons charged the same way repel each other (like charges repel)
• The cloth (with opposite charge) and balloon attract each other (unlike charges attract)
• This demonstrates the existence of two kinds of charges: positive and negative

Question: In section 5.4.2 discussing gravitational force, why does every object thrown upward eventually come back down to Earth?
A. Air pressure pushes objects downward
B. The Earth exerts a continuous attractive force on all objects
C. Objects naturally move in circular paths
D. Friction from the atmosphere pulls objects back
Show Answer & Explanation

Answer: (B) The Earth exerts a continuous attractive force on all objects

Explanation:
The chapter defines gravitational force as the force with which Earth attracts objects towards itself, explaining why all objects fall back down regardless of how hard they are thrown upward.

Question: According to section 5.5, why do different objects hanging from a spring produce different amounts of stretching in the spring?
A. The spring itself changes size for different objects
B. Different objects have different weights because Earth pulls them with different forces
C. The spring can only stretch a fixed amount regardless of the object
D. All objects have the same weight on Earth
Show Answer & Explanation

Answer: (B) Different objects have different weights because Earth pulls them with different forces

Explanation:
The chapter shows through Activity 5.9 that different objects cause different stretches in the spring, indicating that the Earth pulls different objects with different forces—meaning their weights are different.

Question: In Activity 5.10 and 5.11, why must a spring balance have clear markings and divisions to accurately measure weight?
A. Markings make the instrument look more scientific
B. The number of divisions between marked values determines the smallest weight that can be measured
C. Spring balances cannot work without markings
D. Markings prevent the spring from stretching
Show Answer & Explanation

Answer: (B) The number of divisions between marked values determines the smallest weight that can be measured

Explanation:
When there are 5 divisions between 1 N markings, each small division represents 0.2 N—this calculation of smallest readable value requires clear markings and divisions.

Question: The chapter notes that spring balances display both weight in newtons and mass in grams on different scales. Why is this dual scale approach problematic from a scientific perspective?
A. Newton and gram measure the same thing
B. Weight and mass are different quantities—weight is gravitational force measured in newtons, while mass is the amount of matter measured in kilograms
C. Grams are not an accepted unit
D. The scales confuse scientists intentionally
Show Answer & Explanation

Answer: (B) Weight and mass are different quantities—weight is gravitational force measured in newtons, while mass is the amount of matter measured in kilograms

Explanation:
The chapter emphasizes that although everyday language uses 'weight' for mass, scientifically weight is the gravitational force (in newtons) while mass is the amount of matter (in grams or kilograms), making the dual scales on the balance potentially misleading.

Question: In section 5.6, when an empty bottle with a sealed lid is pushed underwater and released, it bounces back to the surface. Which force explained in the chapter is responsible for this upward motion?
A. Gravitational force
B. Frictional force
C. Buoyant force or upthrust from the water
D. Magnetic force
Show Answer & Explanation

Answer: (C) Buoyant force or upthrust from the water

Explanation:
The chapter introduces buoyant force or upthrust as the force applied by liquids on objects in the upward direction, which in this case overcomes the downward gravitational force and pushes the bottle back to the surface.

Question: In the opening scenario, Sonali and Ragini's bicycles accelerated downhill without them pedalling. Which force from the chapter is primarily responsible for this acceleration?
A. Frictional force acting upward along the slope
B. Gravitational force pulling the bicycles toward Earth
C. Muscular force from their leg movements
D. Electrostatic force from the atmosphere
Show Answer & Explanation

Answer: (B) Gravitational force pulling the bicycles toward Earth

Explanation:
The chapter explains that gravitational force acts as a non-contact force pulling all objects toward Earth. When the bicycles moved downhill faster without pedalling, the gravitational force pulling them downward caused this acceleration.

Question: When a plastic scale is rubbed vigorously with polythene and brought near small pieces of paper on a table without touching them, the papers stick to the scale. Which characteristic of the force involved makes this a non-contact force?
A. The force requires direct physical contact between the scale and paper
B. The force arises from electrical charges built up on the scale's surface that act across a distance
C. The force is caused by tiny irregularities between surfaces
D. The force depends on the roughness of both the scale and the table surface
Show Answer & Explanation

Answer: (B) The force arises from electrical charges built up on the scale's surface that act across a distance

Explanation:
Electrostatic force develops when rubbing creates static electrical charges on an object. These charges exert force on uncharged objects from a distance without physical contact, which is why the papers are attracted to the scale without touching it.

Question: In Activity 5.3, an object placed on a table is gently pushed and slides for some distance before stopping on its own. Based on the chapter's explanation, which force is responsible for bringing the object to rest?
A. Gravitational force pulling it downward
B. Friction force acting opposite to the direction of motion
C. Muscular force from the initial push
D. Buoyant force from the air
Show Answer & Explanation

Answer: (B) Friction force acting opposite to the direction of motion

Explanation:
The chapter defines friction as the force that comes into play when an object moves or tries to move over another surface, always acting in a direction opposite to motion. When the object slides across the table, friction between the object and table surfaces opposes its motion and brings it to a stop.

Question: When two balloons are rubbed with a woollen cloth and brought close to each other, they repel and move away from one another. What does this observation reveal about the electrical charges on the two balloons?
A. One balloon has positive charge and the other has negative charge
B. Both balloons have acquired similar or like charges that repel each other
C. The balloons have no electrical charge but are affected by magnetic force
D. The woollen cloth's charge attracts the balloons toward it, not away from each other
Show Answer & Explanation

Answer: (B) Both balloons have acquired similar or like charges that repel each other

Explanation:
• The chapter states that similarly charged balloons repel each other
• Since both balloons were rubbed in the same way with the woollen cloth, they acquired similar charges
• The repulsion between them demonstrates that like charges repel, as stated in the electrostatic force section

Question: A spring balance displays weight measurements in newtons (N) on one scale and mass measurements in grams (g) on another scale. Why does the chapter note that these two different units appear on the same instrument?
A. Both weight and mass are identical physical quantities that need two names
B. The instrument can measure both weight and mass because Earth's gravitational force remains nearly constant everywhere on Earth
C. Weight and mass are always equal in value, so either scale can be used interchangeably
D. The grams scale is only for measuring objects on the Moon or other planets
Show Answer & Explanation

Answer: (B) The instrument can measure both weight and mass because Earth's gravitational force remains nearly constant everywhere on Earth

Explanation:
The chapter explains that weight varies with gravitational force while mass remains constant. Since Earth's gravitational force is nearly the same everywhere on Earth's surface, the weight of an object remains almost constant in a given location. This allows spring balances to calibrate a mass scale alongside the weight scale for practical use on Earth.

Question: According to the chapter's explanation of Archimedes' Principle, under what condition will an object float in a liquid rather than sink?
A. When the object is lighter in color than the liquid
B. When the weight of the liquid displaced by the object equals the weight of the object itself
C. When the object is made of metal or other dense material
D. When the object is placed gently on the surface of the liquid
Show Answer & Explanation

Answer: (B) When the weight of the liquid displaced by the object equals the weight of the object itself

Explanation:
Archimedes' Principle, as presented in the chapter, states that an object experiences an upward force equal to the weight of the liquid it displaces. Floating occurs when the buoyant force (weight of displaced liquid) equals the object's weight, creating balance between downward gravitational force and upward buoyant force.

Question: In Activity 5.4, when the same object is pushed across different surfaces such as glass, cloth, wood, ceramic tile, and sand, it stops at different distances on each surface. What fundamental principle about friction does this demonstrate?
A. Friction acts only on rough surfaces, never on smooth ones
B. The force of friction depends on the nature and roughness of the surfaces in contact
C. All surfaces produce exactly the same amount of friction force
D. Friction is caused by the shape and size of the object being pushed
Show Answer & Explanation

Answer: (B) The force of friction depends on the nature and roughness of the surfaces in contact

Explanation:
The chapter explicitly states that friction depends upon the nature of the surfaces in contact and is greater on rough surfaces. The varying distances in Activity 5.4 directly show this principle—rougher surfaces like sand create greater friction and stop the object sooner, while smoother surfaces like glass create less friction and allow the object to travel further.

Question: A 1 kilogram object weighs 10 newtons on Earth but only 1.6 newtons on the Moon. Based on the chapter's distinction between mass and weight, which statement correctly explains this difference?
A. The object's mass becomes smaller on the Moon, causing it to weigh less
B. The Moon's gravitational force is weaker than Earth's, pulling the object with less force
C. Weight and mass are the same thing, so the object must physically become lighter on the Moon
D. The object loses some of its matter when transported to the Moon
Show Answer & Explanation

Answer: (B) The Moon's gravitational force is weaker than Earth's, pulling the object with less force

Explanation:
The chapter clearly distinguishes that mass remains constant while weight changes based on gravitational force. Weight is the force with which a celestial body pulls an object. Since the Moon exerts much weaker gravitational force than Earth, the same 1 kg object experiences less pulling force and therefore has less weight on the Moon.

Question: When an empty bottle with a tightly sealed lid is pushed underwater in a bucket of water and then released, it bounces back to the surface. Which force explained in the chapter is responsible for this upward motion of the bottle?
A. Gravitational force pulling the bottle downward
B. Electrostatic force from charged water molecules
C. Upthrust or buoyant force applied by the liquid in the upward direction
D. Frictional force between the bottle and water
Show Answer & Explanation

Answer: (C) Upthrust or buoyant force applied by the liquid in the upward direction

Explanation:
Activity 5.13 demonstrates that liquids apply an upward force called upthrust or buoyant force on objects placed in them. When released from underwater, this upward buoyant force (which is greater than the bottle's weight) pushes it back to the surface, causing it to bounce up.

Question: In Activity 5.7, when a charged balloon that was rubbed with a woollen cloth is brought near the same piece of woollen cloth used to charge it, the two move toward each other and attract. What does this interaction reveal about the types of electrical charges?
A. Both the balloon and cloth have acquired the same type of charge
B. The balloon and cloth must have opposite or unlike electrical charges despite being rubbed together
C. Electrical charges cannot exist on both objects simultaneously
D. One object is charged while the other remains neutral and uncharged
Show Answer & Explanation

Answer: (B) The balloon and cloth must have opposite or unlike electrical charges despite being rubbed together

Explanation:
• The chapter explains that attraction indicates unlike or opposite charges
• When rubbing occurs, the rubbing object and rubbed object acquire opposite kinds of charges
• The balloon and woollen cloth attracted each other in the activity, proving they have opposite charges despite being rubbed together
• These opposite charges are called 'positive' and 'negative'

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