CBSE Class 8 Science Chapter 07 Particulate Nature Of Matter MCQs Set 02

Multiple Choice Questions (MCQs) for Class 8 Science: Chapter 07 Particulate Nature Of Matter

Review structured MCQ sets for Class 8 Science Chapter 07 Particulate Nature Of Matter. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Practice Chapter 07 Particulate Nature Of Matter MCQs for Class 8 Science

Navigate directly to the 50 objective questions for Chapter 07 Particulate Nature Of Matter using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.

Question: When chalk is repeatedly ground into finer and finer powder using a mortar and pestle, eventually particles are obtained that cannot be broken down further by hand. What are these irreducible particles called in the chapter?
A. Constituent particles
B. Dust particles
C. Interparticle spaces
D. Dissolved particles
Show Answer & Explanation

Answer: (A) Constituent particles

Explanation:
The chapter defines constituent particles as the basic units that cannot be broken down further—they are the fundamental building blocks of matter. In Activity 7.1, these tiny grains of chalk powder represent the constituent particles that make up larger pieces of chalk.

Question: In Activity 7.2, when sugar dissolves completely in water, the solution looks clear with no visible sugar grains. However, if you taste it, the water is sweet. According to the chapter, where are the sugar particles located in the solution?
A. Floating on the water surface
B. Occupying the interparticle spaces between water particles
C. Settling at the bottom of the container
D. Evaporating into the air
Show Answer & Explanation

Answer: (B) Occupying the interparticle spaces between water particles

Explanation:
The chapter explicitly states that when sugar dissolves, the tiny sugar particles separate and occupy the available spaces between water particles—these spaces are called interparticle spaces. The dissolved sugar cannot be seen but can be sensed by taste.

Question: Which of the following best explains why solids maintain a definite shape while liquids do not?
A. Solids are heavier than liquids
B. Interparticle attractions are strong in solids, holding particles in fixed positions
C. Solids contain more particles than liquids
D. Solids are always at lower temperatures than liquids
Show Answer & Explanation

Answer: (B) Interparticle attractions are strong in solids, holding particles in fixed positions

Explanation:
The chapter explains that in solids, particles are tightly packed and interparticle attractions are very strong, holding particles in fixed positions and preventing them from moving freely. This is why solids have a definite shape, unlike liquids where particles can move past each other.

Question: According to the chapter, what happens to the vibration of particles in a solid when heat is applied?
A. Vibrations decrease and particles move closer together
B. Vibrations increase until they become so vigorous that particles leave their fixed positions
C. Vibrations stop completely
D. Vibrations remain unchanged regardless of temperature
Show Answer & Explanation

Answer: (B) Vibrations increase until they become so vigorous that particles leave their fixed positions

Explanation:
When solids are heated, their particles vibrate more vigorously. The chapter describes that these vibrations eventually become so vigorous that particles start leaving their fixed positions, leading to the conversion of the solid into a liquid state at the melting point.

Question: In Activity 7.4, when water is transferred between containers of different shapes, the water takes the shape of each container but the volume remains 200 mL. Which property of liquids does this demonstrate?
A. Liquids have both fixed shape and fixed volume
B. Liquids have fixed volume but no fixed shape
C. Liquids have fixed shape but no fixed volume
D. Liquids have neither fixed shape nor fixed volume
Show Answer & Explanation

Answer: (B) Liquids have fixed volume but no fixed shape

Explanation:
This observation directly shows that while liquids adapt to the shape of their containers (no fixed shape), the actual amount of liquid remains constant at 200 mL (fixed volume). The chapter uses this activity to establish that liquids have definite volume but not definite shape.

Question: What key observation from Activity 7.5 (smoke spreading between connected gas jars) supports the conclusion that gases have negligible interparticle attractions?
A. The smoke changes colour as it spreads
B. The smoke fills the entire available space without any external force pushing it
C. The smoke becomes denser in one jar than the other
D. The smoke eventually settles at the bottom of the jars
Show Answer & Explanation

Answer: (B) The smoke fills the entire available space without any external force pushing it

Explanation:
The chapter emphasizes that smoke spontaneously fills all available space in both jars without being pushed by any external force. This demonstrates that gas particles move freely in all directions because interparticle attractions are negligible—if attractions were strong, particles would not spread so freely.

Question: In the syringe experiment (Activity 7.6), when the plunger is pushed inward, the volume of air decreases. What does this compression tell us about gas particles in their natural state?
A. Gas particles are permanently bound together
B. Gas particles have very little space between them
C. Gas particles have a lot of space between them, which can be reduced by pressure
D. Gas particles cannot be compressed at any pressure
Show Answer & Explanation

Answer: (C) Gas particles have a lot of space between them, which can be reduced by pressure

Explanation:
The chapter explains that when air is compressed by pushing the plunger, particles are forced to come closer, showing that in their natural state, gas particles have significant space between them. This space can be reduced when external pressure is applied, demonstrating the compressibility of gases.

Question: According to the chapter, the ancient Indian philosopher Acharya Kanad proposed that matter is made of tiny, indivisible eternal particles called 'Parmanu.' How does this ancient concept relate to the modern understanding presented in the chapter?
A. It is completely unrelated to modern particle theory
B. It aligns with the modern idea that matter is composed of extremely small constituent particles
C. It describes atoms but not molecules
D. It only applies to metals and not to other substances
Show Answer & Explanation

Answer: (B) It aligns with the modern idea that matter is composed of extremely small constituent particles

Explanation:
The chapter presents Acharya Kanad's concept as part of India's scientific heritage and notes that his idea of matter being composed of tiny, indivisible particles is fundamentally aligned with the modern understanding that matter consists of constituent particles discussed throughout the chapter.

Question: When potassium permanganate is dropped into water at different temperatures (Activity 7.8 extension), the pink colour spreads fastest in hot water and slowest in ice-cold water. What does this observation reveal about particle movement?
A. Temperature has no effect on particle movement
B. Particle movement increases with temperature, causing faster diffusion
C. Cold water particles move faster than hot water particles
D. The colour of potassium permanganate changes with temperature
Show Answer & Explanation

Answer: (B) Particle movement increases with temperature, causing faster diffusion

Explanation:
The chapter's 'Think like a scientist' section explains that water particles move faster in hot water compared to room temperature, and even slower in ice-cold water. This temperature-dependent difference in spreading rate directly indicates that thermal energy determines how quickly particles move and diffuse through a liquid.

Question: In Activity 7.7, when sugar is added to water, the water level initially rises (B) but after dissolving may decrease slightly (C). What does the decrease from level B to level C indicate about interparticle spacing in liquids?
A. Water particles have no space between them
B. There are gaps between water particles that dissolved sugar particles can occupy
C. Sugar particles are larger than water particles
D. Water particles repel dissolved sugar particles
Show Answer & Explanation

Answer: (B) There are gaps between water particles that dissolved sugar particles can occupy

Explanation:
The chapter states that since the volume of the solution is less than the sum of the volumes of water and sugar added separately, there must be space between water particles. The dissolved sugar particles occupy these interparticle spaces, causing the level to decrease from B to C.

Question: Which sequence correctly represents the order of interparticle spacing from minimum to maximum across the three states of matter?
A. Gas < Liquid < Solid
B. Liquid < Solid < Gas
C. Solid < Liquid < Gas
D. Gas < Solid < Liquid
Show Answer & Explanation

Answer: (C) Solid < Liquid < Gas

Explanation:
• Solids have minimum interparticle spacing—particles are closely packed
• Liquids have more interparticle spacing than solids but less than gases
• Gases have maximum interparticle spacing—particles are very far apart
The chapter's summary table explicitly shows this progression across the three states.

Question: When an incense stick is lit in one corner of a room, its fragrance eventually reaches the opposite corner even though no wind is pushing it. What does this observation (Activity 7.9) demonstrate about gas particles?
A. Gas particles can only move downward due to gravity
B. Gas particles move randomly and freely in all directions throughout the space
C. Gas particles remain stationary near their source
D. Gas particles move only when heated
Show Answer & Explanation

Answer: (B) Gas particles move randomly and freely in all directions throughout the space

Explanation:
The chapter explains that fragrance particles spread throughout the room because air particles are moving constantly and randomly in all directions. The air particles hit the fragrance particles, helping them spread. This shows that gas particles have complete freedom of movement in all available space due to negligible interparticle attractions.

Question: The chapter states that water is an exceptional solid because 'its particles are farther apart than those in water' (the liquid form). How does this unusual property affect ice's interparticle forces and behaviour compared to typical solids?
A. Ice has stronger interparticle forces than water
B. Ice has the same interparticle forces as other solids but different arrangement
C. Ice floats on water because its lower density results from increased spacing between particles
D. Ice melts at a higher temperature than other solids
Show Answer & Explanation

Answer: (C) Ice floats on water because its lower density results from increased spacing between particles

Explanation:
Because ice particles are farther apart than water particles despite both being made of the same substance (H₂O), ice is less dense and therefore floats. This exceptional property—where the solid form is less dense than the liquid—results from the unique arrangement and spacing of water molecules in the solid state, which the chapter identifies as an exception among solids.

Question: According to the chapter's final explanation, when a solid is heated to its melting point and then further heated, the thermal energy of particles is used to overcome interparticle attractions. At what point do particles have enough energy to move freely in all directions?
A. At the melting point of the solid
B. At some temperature between the melting point and boiling point
C. At the boiling point when sufficient energy allows particles to overcome all attractive forces
D. Particles never have enough energy to move freely in all directions
Show Answer & Explanation

Answer: (C) At the boiling point when sufficient energy allows particles to overcome all attractive forces

Explanation:
The chapter explains that at the boiling point (in the gaseous state), particles have enough thermal energy to overcome the forces of attraction between them and move freely in all directions. Before this point, in the liquid state, particles can only move within a limited space because interparticle attractions are still significant.

Question: When sand (an insoluble solid) is added to water in Activity 7.7, the sand particles settle and the total volume increases. How does this behaviour differ from what happens when soluble sugar is added, and what does it reveal?
A. Sand dissolves faster than sugar
B. Sand particles do not occupy interparticle spaces like dissolved sugar does because they are too large and do not break down into individual constituent particles
C. Sand floats while sugar sinks
D. Water repels sand but attracts sugar
Show Answer & Explanation

Answer: (B) Sand particles do not occupy interparticle spaces like dissolved sugar does because they are too large and do not break down into individual constituent particles

Explanation:
• Sand remains as visible particles and settles at the bottom
• Sugar dissolves into individual constituent particles that fit in interparticle spaces
• Sand particles are held together too strongly by interparticle attractions for water to pull them apart
• Sugar particles separate and occupy spaces between water particles
This demonstrates that the strength of interparticle attractions within a substance determines whether it can dissolve and occupy interparticle spaces.

Question: The chapter describes that at the boiling point, vapour formation occurs rapidly 'not only at the surface but also within the liquid' and appears as bubble formation. How does boiling differ fundamentally from evaporation, which occurs at all temperatures?
A. Boiling and evaporation are identical processes
B. Boiling occurs throughout the liquid at a specific temperature while evaporation occurs slowly only at the surface at any temperature
C. Evaporation is faster than boiling
D. Boiling only occurs in hot liquids while evaporation occurs in cold liquids
Show Answer & Explanation

Answer: (B) Boiling occurs throughout the liquid at a specific temperature while evaporation occurs slowly only at the surface at any temperature

Explanation:
The chapter explicitly contrasts these processes: boiling is a rapid process occurring at the boiling point with bubbles forming throughout the liquid, whereas evaporation occurs at all temperatures but is slower and happens only at the surface. Both convert liquid to gas, but boiling is the vigorous version occurring when sufficient thermal energy is provided.

Question: If all constituent particles were somehow removed from a solid object like a wooden chair, what would remain according to the chapter's explanation of matter's composition?
A. The chair structure would remain but become transparent
B. Nothing of the chair would remain—it exists only because of its constituent particles
C. The space between particles would remain as an invisible framework
D. The chair would become very light but still visible
Show Answer & Explanation

Answer: (B) Nothing of the chair would remain—it exists only because of its constituent particles

Explanation:
Since the chapter establishes that matter is entirely composed of constituent particles held together by interparticle attractions, removing all particles means removing the substance itself. There would be nothing left because the chair's existence, its properties, and its mass all depend entirely on the presence and arrangement of these fundamental particles.

Question: When chalk is repeatedly ground into progressively smaller pieces until no further breakdown is possible by hand, what are the ultimate unchanged units obtained called?
A. Chalk dust particles
B. Constituent particles
C. Sand grains
D. Molecular fragments
Show Answer & Explanation

Answer: (B) Constituent particles

Explanation:
The chapter defines constituent particles as the basic units that make up larger pieces of a substance and cannot be broken down further by mechanical means. When chalk is ground to its finest state before molecular separation, these irreducible units are called constituent particles.

Question: In Activity 7.2, when sugar dissolves completely in water until no crystals are visible, what does tasting the sweet solution tell us about where the sugar particles have gone?
A. They have evaporated into the air
B. They now occupy the interparticle spaces between water molecules
C. They have chemically bonded with water and ceased to exist
D. They settle to the bottom of the container
Show Answer & Explanation

Answer: (B) They now occupy the interparticle spaces between water molecules

Explanation:
The chapter explains that dissolved sugar particles separate and occupy the available spaces between water particles, which are known as interparticle spaces. This is why the solution tastes sweet despite no visible sugar grains remaining.

Question: A solid object maintains its definite shape when hammered because its constituent particles are held in fixed positions. Which two properties of solids work together to prevent particles from moving freely?
A. Loose packing and weak forces of attraction
B. Tight packing and strong interparticle attractions
C. Large interparticle spacing and maximum thermal energy
D. Weak forces and maximum interparticle spacing
Show Answer & Explanation

Answer: (B) Tight packing and strong interparticle attractions

Explanation:
Solids have definite shape because particles are tightly packed and the interparticle attractions are very strong. These strong forces hold particles in fixed positions, preventing free movement and restricting motion to only small vibrations.

Question: In Activity 7.4, water transferred between three differently shaped containers A, B, and C always maintains a volume of 200 mL while taking on each container's shape. This demonstrates that liquids have:
A. A fixed shape but changing volume
B. A fixed volume but no fixed shape
C. Both fixed shape and fixed volume
D. Neither fixed shape nor fixed volume
Show Answer & Explanation

Answer: (B) A fixed volume but no fixed shape

Explanation:
The activity clearly shows that the liquid volume remains constant (200 mL) across all three containers, yet water conforms to whatever shape the container has. This proves liquids possess definite volume but lack a fixed shape.

Question: When smoke from an incense stick is trapped in Gas Jar A and then exposed to an empty Gas Jar B (Activity 7.5), the smoke spreads to fill the entire space in both jars. What does this spreading reveal about the nature of gas particles?
A. Gas particles are held together by very strong attractions
B. Gas particles move freely in all directions with negligible interparticle forces
C. Gas particles require external force to move between containers
D. Gas particles are denser than the air around them
Show Answer & Explanation

Answer: (B) Gas particles move freely in all directions with negligible interparticle forces

Explanation:
The smoke spreading spontaneously to fill all available space demonstrates that gas particles move freely without significant interparticle attractions restraining them. This shows that interparticle forces in gases are negligible compared to solids and liquids.

Question: When air inside a syringe is compressed by pushing the plunger inward (Activity 7.6), the volume decreases noticeably. When pressure is released, the plunger returns to its original position. What does this reversible compression reveal about gas particle arrangement?
A. Gas particles are permanently bonded together
B. Gas particles occupy large spaces between them that can be reduced or expanded
C. Gas particles have no space between them in their natural state
D. Gas particles resist all external pressure indefinitely
Show Answer & Explanation

Answer: (B) Gas particles occupy large spaces between them that can be reduced or expanded

Explanation:
The ease with which air compresses and then re-expands shows that gas particles have substantial empty space between them in their natural state. This space can be reduced by external pressure but the particles spread apart again when pressure is removed, showing the loose nature of gas particle arrangement.

Question: When potassium permanganate grains are dropped into water at different temperatures, the pink colour spreads fastest in hot water and slowest in ice-cold water. What does this temperature-dependent spreading rate indicate about particle behaviour?
A. Heat destroys the potassium permanganate molecules
B. Particle movement increases with temperature, causing faster diffusion
C. Cold water particles are stationary and cannot interact with permanganate
D. The colour itself travels faster in hot liquid
Show Answer & Explanation

Answer: (B) Particle movement increases with temperature, causing faster diffusion

Explanation:
The faster spreading in hot water compared to cold water demonstrates that particle movement increases when temperature increases. Water particles move more vigorously at higher temperatures, allowing them to pull out and spread permanganate particles throughout the liquid more quickly.

Question: In Activity 7.7, when sugar is added to water and then dissolved, the final water level (marked as C) is lower than the level immediately after adding sugar (marked as B), even though sugar particles remain in the solution. What does this decrease in volume between levels B and C demonstrate about the structure of liquid water?
A. Water particles expand when sugar is added to them
B. The sugar particles occupy the spaces that existed between water particles
C. The dissolved sugar causes water molecules to move farther apart from each other
D. Some of the water has evaporated due to the dissolving process
Show Answer & Explanation

Answer: (B) The sugar particles occupy the spaces that existed between water particles

Explanation:
The chapter explains in Activity 7.7 that when sugar dissolves, 'The particles of the dissolved substance occupy these spaces' between water particles. Since the combined volume of the solution is less than the sum of the separate volumes of water and sugar, sugar particles must fit into the interparticle spaces already present in liquid water, rather than adding to the total volume.

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Chapter 07 Particulate Nature Of Matter Objective Questions & Solutions for Class 8 Science

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