Chapter Exam

Chapter-9 Matter Around Us — Online MCQ Test

Q: Which state of matter has a fixed shape and a fixed volume?

Answer: A. Solid — Solids have a definite shape and definite volume because their particles are tightly packed.

Q: What is the main reason gases can be compressed easily?

Answer: B. Their particles are far apart — Gas particles have large spaces between them, so they can be compressed easily.

Q: When water is heated from 25°C to 100°C and changes into steam, this process is called ________.

Answer: B. Evaporation — Evaporation is the change of liquid into vapour on heating.

Q: A substance has a definite volume but no definite shape. It can be poured from one container to another. Which state is it most likely in?

Answer: B. Liquid — Liquids have definite volume but no fixed shape, and they can flow and be poured.

SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-9 Matter Around Us with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE. This chapter covers: solid liquid gas Explains the states of matter their properties and changes. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-9 Matter Around Us — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE — Chapter-9 Matter Around Us, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which state of matter has a fixed shape and a fixed volume?

A. Solid ✓
B. Liquid
C. Gas
D. Plasma

Answer: A. Solid
Solids have a definite shape and definite volume because their particles are tightly packed.

What is the main reason gases can be compressed easily?

A. Their particles are very heavy
B. Their particles are far apart ✓
C. Their particles are fixed in place
D. Their particles are arranged in layers

Answer: B. Their particles are far apart
Gas particles have large spaces between them, so they can be compressed easily.

When water is heated from 25°C to 100°C and changes into steam, this process is called ________.

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

Answer: B. Evaporation
Evaporation is the change of liquid into vapour on heating.

A substance has a definite volume but no definite shape. It can be poured from one container to another. Which state is it most likely in?

A. Solid
B. Liquid ✓
C. Gas
D. Plasma

Answer: B. Liquid
Liquids have definite volume but no fixed shape, and they can flow and be poured.

A student says: 'All substances expand on heating and contract on cooling.' Which option is the best answer based on states of matter?

A. Only solids do this, not liquids and gases
B. Only gases do this, not solids and liquids
C. Solids, liquids, and gases generally expand on heating, but gases show the maximum expansion ✓
D. Substances do not change their size with temperature

Answer: C. Solids, liquids, and gases generally expand on heating, but gases show the maximum expansion
All states of matter generally expand on heating and contract on cooling, but gases expand the most because their particles are far apart.

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