Students can practice the best Class 8 Science MCQ and Particulate Nature of Matter Class 8 Science Curiosity Chapter 7 MCQ Online Test with Answers for exam preparation.
Class 8 Science Chapter 7 Particulate Nature of Matter MCQ
Particulate Nature of Matter MCQ
Class 8 Science Chapter 7 MCQ Online Test
Question 1.
Matter has the following features:
I. It occupies space.
II. It has mass.
III. It cannot change its state on heating.
Choose the correct option:
(a) Both I and II
(b) Both II and III
(c) Both I and III
(d) I, II and III
Answer:
(a) Both I and II
Question 2.
While playing on a beach, Meera collected grains of sand and wondered if these grains are the smallest units of matter. She later saw that each grain could be broken into finer powder. What does this tell us about matter? (Competency Based Que.)
(a) Matter is continuous and cannot be broken.
(b) Matter is made of small invisible particles.
(c) Sand is a special kind of liquid.
(d) Sand is the smallest possible unit.
Answer:
(b) Matter is made of small invisible particles.
Question 3.
Two students stirred sugar in water and found that the sugar disappeared but the water tasted sweet. They concluded that
(a) sugar particles evaporated.
(b) sugar reacted with water to form a new compound.
(c) sugar particles occupied spaces between water particles.
(d) sugar got filtered in water.
Answer:
(c) sugar particles occupied spaces between water particles.
Question 4.
Which observation proves that matter is made up of tiny particles?
(a) Ice melts on heating,
(b) Sugar disappears in water but the sweet a taste remains.
(c) Water boils on heating.
(d) Wood breaks into pieces.
Answer:
(b) Sugar disappears in water but the sweet a taste remains.
Question 5.
A stick of chalk is broken again and again until it becomes fine powder. What does this activity demonstrate?
(a) Chalk changes chemically
(b) Chalk becomes liquid
(c) Matter is continuous
(d) Matter is made of small particles
Answer:
(d) Matter is made of small particles
Question 6.
Which of the following activities helps to prove that matter has spaces between particles?
(a) Melting of wax
(b) Boiling of water
(c) Dissolving sugar in water
(d) Compressing solids
Answer:
(c) Dissolving sugar in water
Question 7.
What enables gases to spread and occupy the entire space of a container?
(a) Weak interparticle attraction and large spaces
(b) Strong attraction and large spaces
(c) Fixed shape
(d) High density
Answer:
(a) Weak interparticle attraction and large spaces
Question 8.
What property allows gases to spread quickly and occupy the available space?
(a) Low density
(b) Strong attractions
(c) Rapid motion of particles
(d) Definite shape
Answer:
(c) Rapid motion of particles
Question 9.
The particles of a substance are tightly packed and vibrate about fixed positions. This substance is most likely a
(a) gas
(b) liquid
(c) solid
(d) solution
Answer:
(c) solid
Question 10.
Which one of the following statements about solids is incorrect?
(a) They have fixed shape and volume
(b) Their particles can move freely
(c) They are incompressible
(d) Their particles vibrate in fixed positions
Answer:
(b) Their particles can move freely
Question 11.
Which of the following statements correctly differentiates the two states of matter? Substance X can flow, takes the shape of the container, but cannot be compressed easily. Substance Yspreads to fill the entire container and exerts pressure on its walls. Identify X and Y. (Competency Based Que.)
(a) X – Liquid, Y – Gas
(b) X – Gas, Y – Liquid
(c) X – Solid, Y – Liquid
(d) X – Vapour, Y – Solid
Answer:
(a) X – Liquid, Y – Gas
Question 12.
Which state of matter has particles that are not as tightly packed as solids but are not free like gases?
(a) Liquid
(b) Gas
(c) Solid
(d) Vapour
Answer:
(a) Liquid
Question 13.
Which of the following is a correct order of interparticle spacing from least to greatest?
(a) Solid < Liquid < Gas
(b) Gas < Liquid < Solid
(c) Liquid < Solid < Gas
(d) Solid < Gas < Liquid
Answer:
(a) Solid < Liquid < Gas
Question 14.
What happens to the movement of particles when a substance is heated?
(a) It decreases
(b) It remains the same
(c) It increases
(d) The particles disappear
Answer:
(c) It increases
Question 15.
Karan filled a syringe with water and tried to compress it by pushing the plunger. He found it very difficult. What does this activity prove? (Competency Based Que.)
(a) Water particles are far apart.
(b) Liquids are compressible.
(c) Liquids have negligible mass.
(d) Liquids cannot be compressed easily due to little interparticle space.
Answer:
(d) Liquids cannot be compressed easily due to little interparticle space.
Question 16.
A student observes pink colour slowly spreading in a beaker after adding potassium permanganate. What process is being observed?
(a) Condensation
(b) Sedimentation
(c) Diffusion
(d) Melting
Answer:
(c) Diffusion
Question 17.
Hot water was used to dissolve potassium permanganate faster than cold water. What is the reason?
(a) Water particles freeze faster.
(b) Particles move faster at high temperature.
(c) Potassium permanganate is lighter.
(d) Colour dissolves better in hot water.
Answer:
(b) Particles move faster at high temperature.
Question 18.
Riya placed some water in three differently shaped containers. In all, the water level remained the same, but shape changed. This shows that (Competency Based Que.)
(a) Water is compressible.
(b) Liquids have fixed shape.
(c) Liquids take shape of container but have fixed volume.
(d) Liquids have no volume.
Answer:
(c) Liquids take shape of container but have fixed volume.
Question 19.
What is observed when a gas jar containing iodine vapour is placed over an empty jar?
(a) Vapour condenses.
(b) Vapour remains in lower jar.
(c) Vapour spreads to both jars.
(d) Vapour settles down.
Answer:
(c) Vapour spreads to both jars.
Question 20.
Why can gases exert pressure on the walls of the container?
(a) Their particles are at rest.
(b) Their particles are closely packed.
(c) Their particles move randomly and collide with walls.
(d) They occupy definite volume.
Answer:
(c) Their particles move randomly and collide with walls.
Question 21.
Read the following statements about the characteristics of particles of matter.
(i) Particles of matter are always in motion.
(ii) Particles of matter have spaces between them.
(iii) Particles do not attract each other.
(iv) Particles are not affected by temperature.
Choose the correct combination of true statements:
(a) (i), (ii), (iii)
(b) (i), (ii) only
(c) (i), (ii), (iv)
(d) (i), (ii) only
Answer:
(b) (i), (ii) only
Question 22.
A student fills a gas jar with smoke from an incense stick and covers it with another jar. Later, smoke is seen in both jars. This shows that
(a) smoke reacts with air
(b) smoke gets pulled down
(c) gases spread and occupy space
(d) gases are heavier than air
Answer:
(c) gases spread and occupy space
Question 23.
Select as why do solids retain a definite shape and volume under normal conditions?
(a) Their particles are loosely held and far apart
(b) The particles move freely in all directions.
(c) The particles are closely packed and held by strong attractive forces.
(d) They have large interparticle gaps and weak attractions.
Answer:
(c) The particles are closely packed and held by strong attractive forces.
Question 24.
What change occurs in the motion of particles when a solid is gradually heated?
(a) Particles stop moving and settle down.
(b) Particles start vibrating more and may break free from fixed positions.
(c) Particles shrink and become tightly packed.
(d) Particles become heavier and sink.
Answer:
(b) Particles start vibrating more and may break free from fixed positions.
Question 25.
Why can liquids flow and take the shape of the container in which they are poured?
(a) Their particles are strongly bonded.
(b) Their particles have fixed positions but change volume.
(c) Their particles can slide over each other as they are loosely packed.
(d) Their shape remains unchanged regardless of the container.
Answer:
(c) Their particles can slide over each other as they are loosely packed.
Question 26.
Which statement is correct about the properties of gases?
(a) Gases have a definite shape and occupy a fixed space.
(b) Gases can be compressed easily due to large spaces between particles.
(c) Gases have strong interparticle forces like solids.
(d) Gases are made of stationary particles that do not interact.
Answer:
(b) Gases can be compressed easily due to large spaces between particles.
Question 27.
The spreading of perfume in a room from one corner is an example of
(a) gases gaining mass
(b) gases becoming liquids
(c) free movement of gas particles in all directions
(d) evaporation of solids
Answer:
(c) free movement of gas particles in all directions
Particulate Nature of Matter Class 8 Assertion Reason Questions
The following questions consist of two statements.
Assertion (A) and Reason (R). Answer the following questions by selecting the appropriate option given below
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Question 1.
Assertion (A) All substances around us are made up of particles so tiny that they cannot be seen with the naked eye.
Reason (R) When sugar is added to water, it disappears because it undergoes a chemical reaction with water.
Answer:
(c) A is true, but R is false. Sugar disappears in water because it breaks down into tiny particles and gets evenly distributed in the water, but no new substance is formed. Hence, it is a physical change, not a chemical reaction.
Question 2.
Assertion (A) Solids retain a fixed shape and volume under normal conditions.
Reason (R) The particles in a solid are loosely packed in a regular arrangement, restricting their movement.
Answer:
(c) A is true, but R is false. Solids do have a definite shape and volume because their particles are packed very closely together and held by strong forces of attraction, not loosely as the reason incorrectly suggests.
Question 3.
Assertion (A) When sugar dissolves in water, the water level may not rise as much as expected.
Reason (R) The sugar particles settle in the spaces between the water particles without significantly increasing the volume.
Answer:
(a) Both A and R are true and R is the correct explanation of A.
Question 4.
Assertion (A) Potassium permanganate crystals dissolve and spread more quickly in hot water than in cold water.
Reason (R) Heating increases the energy and movement of water particles, which helps in faster spreading of solute particles.
Answer:
(a) Both A and R are true and R is the correct explanation of A.
Question 5.
Assertion (A) Gas particles move rapidly and in all possible directions, occupying the entire space available.
Reason (R) Gases have very weak interparticle forces and large gaps between their particles, allowing free movement.
Answer:
(a) Both A and R are true and R is the correct explanation of A. Gases have very weak attraction between particles and large spaces, which allows their particles to move freely in all directions.
Question 6.
Assertion (A) The melting point of a solid is considered a physical property that helps to identify and classify different substances.
Reason (R) During melting, a substance changes from solid to liquid state without undergoing any change in its chemical composition.
Answer:
(a) Both A and R are true and R is the correct explanation of A
Question 7.
Assertion (A) Gases do not have a fixed shape or volume and fill the entire container in which they are kept.
Reason (R) This happens because the particles of a gas are loosely packed and have negligible interparticle attraction and are free to move in all directions.
Answer:
(a) Both A and R are true and R is the correct explanation of A
Particulate Nature of Matter Class 8 Case Based MCQ Questions
Question 1.
A beaker contains solid salt at the bottom. Water is added and stirred. After some time, the salt completely disappears. The solution appears clear, with no visible particles of salt. This activity is commonly observed in households and is based on the particle nature of matter. (Competency Based Que.)
(i) What does the disappearance of salt in water indicate about particles of matter?
(a) They are fixed in place.
(b) They can mix and occupy empty spaces between other particles.
(c) They lose their identity.
(d) They become heavier in water.
Answer:
(b) They can mix and occupy empty spaces between other particles.
(ii) What property of water allows salt particles to spread throughout?
(a) Water particles are rigid.
(b) Water particles are fixed and orderly.
(c) Water particles are always moving and have spaces between them.
(d) Water particles push salt down.
Answer:
(c) Water particles are always moving and have spaces between them.
(iii) Which of the following is based on the same concept of particle mixing?
(a) Ice melting
(b) Oil floating on water
(c) Sugar dissolving in tea
(d) Water turning to vapour
Answer:
(c) Sugar dissolving in tea
Question 2.
Anaya was comparing a piece of iron nail and a lump of salt. She observed that the iron nail did not break easily, while the salt broke into smaller pieces. This observation helped her understand how particles are arranged in solids and how strong their forces of attraction can be. (Competency Based Que.)
(i) What does this activity suggest about the particles in solids?
(a) Solids have weak forces between particles
(b) Particles in solids are far apart
(c) Particles in solids are closely packed
(d) Solids have no definite shape
Answer:
(c) Particles in solids are closely packed
(ii) Why did the iron nail not break easily?
(a) It is heavier than salt
(b) It has strong interparticle attraction
(c) It has more colour than salt
(d) It is made of smaller particles
Answer:
(b) It has strong interparticle attraction
(iii) Complete the following table based on the properties of solids shown in the activity
| Is this statement true? | Yes/No |
| Solids have strong interparticle forces | Yes/No |
| Particles in solids can flow past each other easily | Yes/No |
| Solids have a definite shape and do not take the container’s shape | Yes/No |
Answer:
(a) Yes (b) No (c) Yes.
Particulate Nature of Matter Class 8 Fill in the blanks
1. Matter is made up of extremely small units called ____________ , which cannot be seen with the naked eye.
Answer:
constituent particles
2. When a solid is ground into fine powder, each small piece still shows the same ____________ as the original material.
Answer:
properties
3. The attraction between particles is strongest in solids and ____________ in gases.
Answer:
weakest
4. When heat is supplied to a substance, the movement of its particles becomes more ____________ .
Answer:
vigorous
5. A ____________ is a state of matter in which particles are loosely packed and can slide over each other.
Answer:
liquid
6. The temperature at which a solid changes into a liquid is called its ____________ .
Answer:
melting point
7. The force of attraction between particles in a solid is _____________ usually than that in liquids and gases.
Answer:
stronger
8. As compared to solids, the particles in a liquid are less _____________ packed but still held together.
Answer:
Tightly
9. A gas neither has a fixed shape nor a fixed _____________ and can spread in all directions.
Answer:
volume
Particulate Nature of Matter Class 8 True or False
1. The powder obtained after grinding chalk is made of different substances.
Answer:
False. It is still the same substance (chalk) in smaller size.
2. Sugar vanishes in water because it chemically reacts with water.
Answer:
False. Sugar dissolves in water and it does not react chemically with water.
3. Particles in a solid state only vibrate and cannot move from their position.
Answer:
True.
4. Gases have the highest interparticle forces among the three states of matter.
Answer:
False. Gases have the weakest interparticle forces among the three states of matter.
5. Liquids do not have a fixed volume.
Answer:
False. Liquids have fixed volume but not fixed shape.
6. In liquids, particles are free to move past one another which allows them to flow.
Answer:
True
7. The volume of gases is fixed and does not change with pressure.
Answer:
False
8. Solids have the weakest interparticle forces among the three states of matter.
Answer:
False
Particulate Nature of Matter Class 8 Match the following
Question 1.
Match the Column I with Column II.
| Column I | Column II |
| A. Solid | 1. Flows and has fixed volume |
| B. Liquid | 2. No fixed shape or volume |
| C. Gas | 3. Particles vibrate in fixed positions |
| D. Interparticle space | 4. Increases from solid to gas |
| E. Movment of fragrance particles collisions. | 5. Spreading due to air particle |
Answer:
A – 3, B – 1, C – 2, D – 4, E – 5
| Column I | Column II |
| A. Solid | 3. Particles vibrate in fixed positions |
| B. Liquid | 1. Flows and has fixed volume |
| C. Gas | 2. No fixed shape or volume |
| D. Interparticle space | 4. Increases from solid to gas |
| E. Movment of fragrance particles collisions. | 5. Spreading due to air particle |
Question 2.
Match the Column I with Column II.
| Column I | Column II |
| A. Chalk powder | 1. Spreads faster due to high temperature |
| B. Sugar in water | 2. Particles vibrate faster |
| C. Heating of solid | 3. Interparticle space occupied |
| D. Iodine vapour | 4. Fills the container |
| E. Potassium permanganate in hot water | 5. Physical change |
Answer:
A – 5, B – 3, C – 2, D – 4, E – 1
| Column I | Column II |
| A. Chalk powder | 5. Physical change |
| B. Sugar in water | 3. Interparticle space occupied |
| C. Heating of solid | 2. Particles vibrate faster |
| D. Iodine vapour | 4. Fills the container |
| E. Potassium permanganate in hot water | 1. Spreads faster due to high temperature |
Question 3.
Match the Column I with Column II.
| Column I | Column II |
| A. Solid | 1. Fills entire container |
| B. Liquid | 2. Has definite shape and volume |
| C. Gas | 3. Spreads smell quickly |
| D. Potassium Permanganate | 4. Has fixed volume but no fixed shape |
| E. Air | 5. Demonstrates movement of part in water |
Answer:
A – 2, B – 4, C – 1, D – 5, E – 3
| Column I | Column II |
| A. Solid | 2. Has definite shape and volume |
| B. Liquid | 4. Has fixed volume but no fixed shape |
| C. Gas | 1. Fills entire container |
| D. Potassium Permanganate | 5. Demonstrates movement of part in water |
| E. Air | 3. Spreads smell quickly |