Chapter Exam

Chapter-10 Changes Around Us — Online MCQ Test

Q: Which of the following is a physical change?

Answer: C. Melting of ice — Melting of ice changes only the state of water and no new substance is formed. It is a physical change.

Q: Which change produces a new substance?

Answer: C. Rusting of iron — Rusting of iron forms a new substance called iron oxide. This is a chemical change.

Q: When camphor is left open, it gradually disappears. This is because it undergoes:

Answer: B. Sublimation — Camphor changes directly from solid to vapour without becoming liquid. This process is called sublimation.

Q: In which of the following cases can the original substance be recovered most easily by a simple method?

Answer: C. Salt dissolved in water — Salt can be recovered from salt solution by evaporation, which is a simple separation process. The other options involve chemical changes and cannot be easily reversed.

SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-10 Changes Around Us with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE. This chapter covers: physical change chemical change Covers physical and chemical changes in everyday life. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-10 Changes Around Us — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE — Chapter-10 Changes Around Us, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is a physical change?

A. Rusting of iron
B. Burning of paper
C. Melting of ice ✓
D. Curdling of milk

Answer: C. Melting of ice
Melting of ice changes only the state of water and no new substance is formed. It is a physical change.

Which change produces a new substance?

A. Cutting paper
B. Dissolving sugar in water
C. Rusting of iron ✓
D. Stretching a rubber band

Answer: C. Rusting of iron
Rusting of iron forms a new substance called iron oxide. This is a chemical change.

When camphor is left open, it gradually disappears. This is because it undergoes:

A. Melting
B. Sublimation ✓
C. Freezing
D. Condensation

Answer: B. Sublimation
Camphor changes directly from solid to vapour without becoming liquid. This process is called sublimation.

Which observation most strongly indicates that a chemical change has occurred?

A. Change in shape only
B. Formation of a new substance with different properties ✓
C. Change in position
D. Change in size only

Answer: B. Formation of a new substance with different properties
The formation of a new substance is the main sign of a chemical change. Other changes like size or shape alone are physical changes.

In which of the following cases can the original substance be recovered most easily by a simple method?

A. Burnt paper
B. Rust
C. Salt dissolved in water ✓
D. Cooked rice

Answer: C. Salt dissolved in water
Salt can be recovered from salt solution by evaporation, which is a simple separation process. The other options involve chemical changes and cannot be easily reversed.

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