Particulate Nature of Matter Class 8 MCQ
hardParticulate Nature of Matter Class 8 MCQ
Particulate Nature of Matter Class 8 MCQ
Question 1.
What is the primary characteristic of particles in a solid?
(a) They are far apart and move freely.
(b) They are closely packed and vibrate in fixed positions.
(c) They are loosely arranged and can flow.
(d) They are completely stationary.
Answer:
(b) They are closely packed and vibrate in fixed positions.
Question 2.
Which state of matter has the weakest interparticle attractions?
(a) Solid
(b) Liquid
(c) Gas
(d) Plasma
Answer:
(c) Gas
Question 3.
Why do liquids take the shape of their container?
(a) Because their particles are fixed in place.
(b) Because their particles are closely packed and cannot move.
(c) Because their particles can move past each other.
(d) Because they have no definite volume.
Answer:
(c) Because their particles can move past each other.
Question 4.
What is the effect of heating a solid, such as ice, on its particles?
(a) The particles move closer together.
(b) The particles vibrate faster and may break free to become a liquid.
(c) The particles become stationary.
(d) The particles disappear.
Answer:
(d) The particles disappear.
Question 5.
Which of the following statements is true about gases?
(a) Gases have a fixed shape and volume.
(b) Gases have a definite volume but no fixed shape.
(c) Gases have neither a fixed shape nor a fixed volume.
(d) Gases are incompressible.
Answer:
(c) Gases have neither a fixed shape nor a fixed volume.
Question 6.
Why can we not see air, yet it adds weight to an inflated balloon?
(a) Air has no mass.
(b) Air is made of invisible particles that exert pressure.
(c) Air is a liquid.
(d) Air is only present in the balloon.
Answer:
(b) Air is made of invisible particles that exert pressure.
Question 7.
Which of the following describes the arrangement of particles in a liquid?
(a) Particles are tightly packed and vibrate in place.
(b) Particles are far apart and move freely.
(c) Particles are closely packed but can slide past each other.
(d) Particles are arranged in a fixed pattern.
Answer:
(c) Particles are closely packed but can slide past each other.
Question 8.
What is the reason that solids maintain a fixed shape?
(a) The particles are far apart and can move freely.
(b) The particles are closely packed with strong interparticle attractions.
(c) The particles are in constant motion.
(d) The particles have negligible attraction.
Answer:
(b) The particles are closely packed with strong interparticle attractions.
Case Study
I. The Behaviour of Solids
In solids, particles are closely packed together, held by strong interparticle forces of attraction. This arrangement restricts their movement to only slight vibrations, which is why solids maintain a definite shape and volume. For example, a block of ice retains its form until it melts, demonstrating that the thermal energy of the particles is low, keeping them in fixed positions. Understanding this behaviour is crucial in fields like material science, where the properties of solids are essential for designing structures.
Question 1.
What primarily keeps the particles in a solid closely packed together?
(a) High thermal energy
(b) Strong interparticle forces of attraction
(c) Low pressure
(d) High temperature
Answer:
(b) Strong interparticle forces of attraction
Question 2.
Which of the following statements is true regarding the behaviour of solids?
(a) Solids can flow like liquids.
(b) The particles in solids have high thermal energy.
(c) A block of ice retains its shape until it melts.
(d) Solids have no fixed volume.
Answer:
(c) A block of ice retains its shape until it melts.
Question 3.
In solids, the particles are held together by ............forces of attraction, which allows them to only vibrate in place.
Answer:
strong
Question 4.
The thermal energy of particles in solids is ............, which is why they maintain a definite shape and volume.
Answer:
low
Question 5.
The particles in solids can move freely and occupy the entire space of the container. (True/False)
Answer:
False
II. The Expansion of Gases
Gases are fascinating due to their ability to fill any available space, a property stemming from the high energy of their particles. When heated, gas particles move rapidly and spread out, demonstrating minimal interparticle attraction. This behaviour is evident when you release air from a balloon; the gas expands to occupy the entire space of the room. Understanding gas behaviour is essential in various applications, such as in meteorology and engineering, where gas laws govern the behaviour of air and other gases under different conditions.
Question 1.
What property of gas allows it to fill any available space?
(a) High density
(b) Strong interparticle attraction
(c) High energy of particles
(d) Fixed volume
Answer:
(c) High energy of particles
Question 2.
When air is released from a balloon, what happens to the gas inside?
(a) It stays in the balloon
(b) It expands to occupy the entire room
(c) It turns into a liquid
(d) It compresses into a smaller volume
Answer:
(b) It expands to occupy the entire room
Question 3.
The particles in gases have ............ interparticle attraction compared to solids and liquids.
Answer:
negligible
Question 4.
When gas particles are heated, they gain ............ energy, causing them to move more rapidly.
Answer:
thermal
Question 5.
Gases have a fixed shape and volume due to strong interparticle attractions. (True/False)
Answer:
False