Chapter Exam

Chapter 5: Changes Around Us Physical and Chemical — 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 therefore a physical change.

Q: The process of changing water into ice is called:

Answer: B. Freezing — Freezing is the change of liquid water into solid ice on cooling.

Q: Which statement best describes a physical change?

Answer: B. Only shape, size, or state changes — In a physical change, only the form, size, or state of a substance changes and no new substance is formed.

Q: Which of the following changes is the best example of a chemical change followed by an irreversible effect?

Answer: B. Rusting of a bicycle chain — Rusting forms a new substance and damages the metal permanently, so it is chemical and irreversible.

Q: A metal lid is very tight on a glass jar. The best way to open it is to place the lid in warm water because:

Answer: B. The lid expands on heating — Heating causes the metal lid to expand, making it easier to remove from the jar.

SCIENCE (CURIOSITY) · CLASS 7th · Karnataka State Board

Practice Chapter 5: Changes Around Us Physical and Chemical with a free chapter-wise online MCQ test for Karnataka State Board CLASS 7th SCIENCE (CURIOSITY). This chapter covers: Physical change Chemical change Reversible Irreversible Reaction Rusting Burning Melting Freezing Expansion. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 5: Changes Around Us Physical and Chemical — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 7th SCIENCE (CURIOSITY) — Chapter 5: Changes Around Us Physical and Chemical, 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. Burning of paper
B. Rusting of iron
C. Melting of ice ✓
D. Cooking of food

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

The process of changing water into ice is called:

A. Melting
B. Freezing ✓
C. Evaporation
D. Expansion

Answer: B. Freezing
Freezing is the change of liquid water into solid ice on cooling.

Which statement best describes a physical change?

A. A new substance is formed
B. Only shape, size, or state changes ✓
C. It is always permanent
D. It cannot be reversed ever

Answer: B. Only shape, size, or state changes
In a physical change, only the form, size, or state of a substance changes and no new substance is formed.

Which of the following changes is the best example of a chemical change followed by an irreversible effect?

A. Melting ice cream
B. Rusting of a bicycle chain ✓
C. Stretching a spring
D. Breaking a pencil

Answer: B. Rusting of a bicycle chain
Rusting forms a new substance and damages the metal permanently, so it is chemical and irreversible.

A metal lid is very tight on a glass jar. The best way to open it is to place the lid in warm water because:

A. The lid contracts more than the glass
B. The lid expands on heating ✓
C. The glass melts slightly
D. The water makes the lid rust

Answer: B. The lid expands on heating
Heating causes the metal lid to expand, making it easier to remove from the jar.

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