Characteristics of Matter — Homi Bhabha Class 9 Chemistry MCQs with Solutions
Free Homi Bhabha Class 9 Chemistry Characteristics of Matter MCQs with step-by-step solutions (10 questions). Part of Matter & Its States. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Characteristics of Matter · medium · theory
Anything that occupies space and has mass is called:
A. energy
B. matter ✓ Correct
C. force
D. pressure
Solution: Matter is anything that has mass and occupies space (volume).
Q2 — Characteristics of Matter · medium · theory
When a spoon of sugar dissolves in water without overflowing, it shows that:
A. particles of matter have spaces between them ✓ Correct
B. water is an element
C. sugar has no mass
D. sugar disappears completely
Solution: Sugar particles fit into the spaces between water particles, so the level barely changes.
Q3 — Characteristics of Matter · hard · theory
The spreading of the smell of perfume across a room is evidence that particles of matter:
A. are continuously moving ✓ Correct
B. cannot mix
C. have no space between them
D. are at rest
Solution: Diffusion of perfume shows particles are in constant random motion and mix with air particles.
Q4 — Characteristics of Matter · medium · theory
Diffusion is fastest in:
A. liquids
B. solids
C. crystals
D. gases ✓ Correct
Solution: Gas particles move fastest and are farthest apart, so diffusion is quickest in gases.
Q5 — Characteristics of Matter · hard · theory
The random zig-zag motion of tiny particles suspended in a fluid, seen under a microscope, is called:
A. Brownian motion ✓ Correct
B. sublimation
C. condensation
D. diffusion
Solution: Brownian motion is the erratic movement of suspended particles caused by collisions with fast-moving fluid particles.
Q6 — Characteristics of Matter · medium · theory
Solids, liquids and gases differ mainly in the:
A. number of elements they contain
B. mass of their particles
C. arrangement and movement of their particles ✓ Correct
D. colour of their particles
Solution: The three states differ in how closely packed and how freely moving their particles are.
Q7 — Characteristics of Matter · easy · theory
Which characteristic of matter explains why gases can be compressed easily but solids cannot?
A. Solid particles are always completely at rest
B. Gas particles are much heavier than solid particles
C. The particles of a gas have large spaces between them ✓ Correct
D. Gases have no mass while solids do
Solution: Gases have large inter-particle spaces, so the particles can be pushed closer together; in solids the particles are tightly packed with almost no space, so they resist compression.
Q8 — Characteristics of Matter · easy · theory
The gradual mixing of the particles of two different gases into one another on their own is called
A. evaporation
B. sublimation
C. diffusion ✓ Correct
D. condensation
Solution: Diffusion is the spontaneous intermixing of particles of two substances because of their continuous random motion; no stirring is needed.
Q9 — Characteristics of Matter · medium · theory
A few crystals of potassium permanganate are dropped into a beaker of still water and the purple colour slowly spreads through the whole water. This observation best shows that particles of matter
A. can be created and destroyed in water
B. are continuously moving and have spaces between them ✓ Correct
C. are electrically charged and attract water
D. have a fixed volume only when in a liquid
Solution: The colour spreading without stirring (diffusion) proves that particles are in constant motion and that there are spaces between water particles for them to move into.
Q10 — Characteristics of Matter · hard · theory
Assertion: The diffusion of copper sulphate through water becomes faster when the water is warm. Reason: Raising the temperature increases the kinetic energy and hence the speed of the particles. Choose the correct option.
A. Both assertion and reason are true but the reason does not explain the assertion
B. Both assertion and reason are true and the reason correctly explains the assertion ✓ Correct
C. The assertion is false but the reason is true
D. The assertion is true but the reason is false
Solution: Higher temperature gives particles more kinetic energy, so they move faster and intermix (diffuse) more quickly. The reason is the correct explanation of the faster diffusion.