“Particulate Nature of Matter – Class 8 Science Objective Questions (MCQs with Answers)”
Multiple Choice Questions:
What are the extremely small units that make up all matter called, and why are they considered the building blocks of everything around us?
a) Cells
b) Atoms or molecules
c) Ions
d) CompoundsWho among the following ancient philosophers first proposed the concept of “Parmanu,” and how did this idea influence later scientific thought?
a) Aryabhata
b) Acharya Kanad
c) Charaka
d) PaniniWhat are the forces that hold constituent particles together in matter called, and how do they influence the state of a substance?
a) Gravitational forces
b) Interparticle attractions
c) Magnetic forces
d) Electric forcesIn which state of matter are the interparticle forces of attraction the strongest, and therefore, the particles remain closely packed?
a) Gas
b) Liquid
c) Solid
d) PlasmaWhat term is used to describe the spaces between the constituent particles of matter, and why are these spaces important for explaining compressibility?
a) Air gaps
b) Interparticle spaces
c) Pores
d) Interatomic bondsWhat happens to the interparticle spaces when a solid is heated, and how does this change lead to melting?
a) They decrease
b) They increase
c) They remain unchanged
d) They become zeroWhat is the temperature at which a solid changes into a liquid called, and why is it different for various substances?
a) Boiling point
b) Melting point
c) Freezing point
d) Condensation pointWhich state of matter has a definite volume but no definite shape, and how does this property help liquids adapt to their containers?
a) Solid
b) Liquid
c) Gas
d) PlasmaWhich state of matter has neither a fixed shape nor a fixed volume, and as a result, spreads to fill the entire container?
a) Solid
b) Liquid
c) Gas
d) Semi-solidWhy can gases be compressed easily compared to solids and liquids, and what does this reveal about their particle arrangement?
a) Because gas particles are heavy
b) Because gases have large interparticle spaces
c) Because gases have strong attractions
d) Because gases are cold
More:
11. What happens to the motion of particles when a substance is heated, and consequently, how does this affect its state?
a) It decreases
b) It stops
c) It increases
d) It remains the same
12. Why does the fragrance of perfume spread throughout a room, and how does this phenomenon demonstrate diffusion?
a) Due to conduction
b) Due to convection
c) Due to diffusion
d) Due to evaporation
13. What happens when sugar dissolves in water, and why do we no longer see the sugar crystals afterward?
a) Sugar disappears completely
b) Sugar particles occupy spaces between water particles
c) Sugar changes into water
d) Water particles break down
14. Which of the following states of matter can flow easily, and therefore, are collectively known as fluids?
a) Solids
b) Liquids and gases
c) Only gases
d) Only liquids
15. What type of movement do the particles in solids exhibit, and why can they not move freely like those in liquids or gases?
a) Free movement
b) Random motion
c) Vibrations about fixed positions
d) Rotational motion
16. What happens to the interparticle attraction as the interparticle distance increases, and what is the effect on the strength of the forces?
a) It increases
b) It decreases
c) It remains constant
d) It becomes stronger
17. Which state of matter has the highest kinetic energy of particles, and how does this explain their ability to expand and fill any space?
a) Solid
b) Liquid
c) Gas
d) Plasma
18. Why does a liquid take the shape of the container in which it is poured, whereas a solid does not?
a) Because its particles are fixed
b) Because its particles move freely within limited space
c) Because it has no particles
d) Because it expands on cooling
19. Why can we not compress a solid easily, and what does this indicate about the arrangement of its particles?
a) Because its particles are far apart
b) Because its particles are loosely packed
c) Because its particles are closely packed
d) Because it contains air
20. What term is used for liquids and gases as they can flow easily, and how does this property distinguish them from solids?
a) Solids
b) Elements
c) Fluids
d) Mixtures
Answer Key:
1. b) Atoms or molecules
2. b) Acharya Kanad
3. b) Interparticle attractions
4. c) Solid
5. b) Interparticle spaces
6. b) They increase
7. b) Melting point
8. b) Liquid
9. c) Gas
10. b) Because gases have large interparticle spaces
11. c) It increases
12. c) Due to diffusion
13. b) Sugar particles occupy spaces between water particles
14. b) Liquids and gases
15. c) Vibrations about fixed positions
16. b) It decreases
17. c) Gas
18. b) Because its particles move freely within limited space
19. c) Because its particles are closely packed
20. c) Fluids
Fill in the Blanks:
(Choose the correct option and fill in the blank.)
1. Matter is composed of _______ particles, and these particles are so tiny that they cannot be seen even with a microscope.
a) Heavy b) Large c) Small d) Invisible
Answer: d) Invisible
2. The smallest indivisible particle of matter was called _______ by Acharya Kanad, and this idea later inspired the concept of the atom.
a) Molecule b) Parmanu c) Element d) Compound
Answer: b) Parmanu
3. The particles of matter are held together by _______ forces, which vary in strength depending on the state of matter.
a) Gravitational b) Interparticle c) Electric d) Magnetic
Answer: b) Interparticle
4. The spaces between the particles of matter are called _______; these spaces explain how gases can be compressed easily.
a) Air pockets b) Interparticle spaces c) Voids d) Layers
Answer: b) Interparticle spaces
5. In solids, the interparticle attraction is _______ strong, and hence they have a definite shape and volume.
a) Very b) Moderately c) Slightly d) Barely
Answer: a) Very
6. The temperature at which a solid changes into a liquid is known as its _______; however, this point varies from substance to substance.
a) Freezing point b) Boiling point c) Melting point d) Condensation point
Answer: c) Melting point
7. The process by which particles of two substances mix on their own is called _______; it occurs faster in gases due to large spaces between particles.
a) Filtration b) Diffusion c) Sedimentation d) Distillation
Answer: b) Diffusion
8. Liquids have a fixed _______ but no fixed shape, as they take the shape of the container in which they are kept.
a) Colour b) Volume c) Mass d) Density
Answer: b) Volume
9. Gases can be easily _______ because of the wide interparticle gaps present in them.
a) Frozen b) Compressed c) Melted d) Expanded
Answer: b) Compressed
10. Both liquids and gases can flow freely; therefore, they are together called _______.
a) Solids b) Fluids c) Mixtures d) Crystals
Answer: b) Fluids
True or False:
1. Solids have a fixed shape and definite volume because their particles are tightly packed. — True
2. Liquids have both a fixed shape and fixed volume just like solids. — False
3. Gases can be compressed easily since their particles are far apart. — True
4. Interparticle attractions are strongest in gases and weakest in solids. — False
5. On heating a substance, the movement of its particles increases, and they move farther apart. — True
6. The process of diffusion occurs faster in liquids than in gases. — False
7. The melting of ice into water shows that heating can weaken interparticle attractions. — True
8. Particles of matter remain at rest and do not move at all. — False
9. When we dissolve sugar in water, its particles occupy the spaces between water particles. — True
10. Both solids and gases can easily take the shape of any container. — False
Match the Following :
| Column A | Column B |
|---|---|
| 1. Solid | (c) Particles tightly packed and vibrating at fixed positions |
| 2. Liquid | (a) Fixed volume but takes the shape of the container |
| 3. Gas | (b) Particles far apart and move freely in all directions |
Answers: 1–c, 2–a, 3–b
Assertion–Reason Questions:
1. Assertion (A): Solids have a definite shape and volume.
Reason (R): The particles in solids are closely packed and held together by strong interparticle forces.
a) Both A and R are true, and R correctly explains A.
b) Both A and R are true, but R does not explain A.
c) A is true, but R is false.
d) A is false, but R is true.
Answer: a) Both A and R are true, and R correctly explains A.
2. Assertion (A): Diffusion occurs faster in gases than in liquids.
Reason (R): Gas particles have large interparticle spaces and move freely in all directions.
a) Both A and R are true, and R correctly explains A.
b) Both A and R are true, but R does not explain A.
c) A is true, but R is false.
d) Both A and R are false.
Answer: a) Both A and R are true, and R correctly explains A.
To Learn more Click Below:
MCQs:
Chapter 1- Exploring the Investigative World of Science – CLICK HERE
Chapter 2- The Invisible Living World: Beyond Our Naked Eye – CLICK HERE
Chapter 3- Health: The Ultimate Treasure – CLICK HERE
Chapter 4-Electricity: Magnetic and Heating Effects – CLICK HERE
Chapter 5- Exploring Forces – CLICK HERE
Chapter 6- Pressure, Winds, Storms, and Cyclones – CLICK HERE