Chapter-10 Changes Around Us — Online MCQ Test
SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board
Practice Chapter-10 Changes Around Us with a free chapter-wise online MCQ test.
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.
Chapter-10 Changes Around Us — Important Questions & Answers
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.
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.
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.
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.
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.
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.