Chapter-9 Matter Around Us — Online MCQ Test
SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board
Practice Chapter-9 Matter Around Us with a free chapter-wise online MCQ test.
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.
Chapter-9 Matter Around Us — Important Questions & Answers
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.
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.
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.
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.
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.
All states of matter generally expand on heating and contract on cooling, but gases expand the most because their particles are far apart.