Chapter Exam

Chapter-13 Water — Online MCQ Test

Q: Which of the following is the main source of water on Earth?

Answer: B. Rain — Rain is the primary source that replenishes water bodies on Earth. It is an important part of the water cycle.

Q: Which process changes water into water vapour due to heat from the Sun?

Answer: C. Evaporation — Evaporation is the process by which water changes into vapour on heating. The Sun provides the energy for this change.

Q: What happens when water vapour cools and changes into tiny water droplets?

Answer: B. Condensation — Condensation is the process in which water vapour cools and turns into liquid droplets. This leads to cloud formation.

Q: A student keeps an open container of water in the Sun. After some time, the water level decreases. Which process caused this?

Answer: B. Evaporation — Heat from the Sun changes liquid water into vapour, reducing the water level. This is evaporation.

Q: Which of the following is the most appropriate reason for constructing check dams?

Answer: B. To store water and improve groundwater recharge — Check dams help retain water for a longer time and allow it to seep into the ground. This supports groundwater recharge and water conservation.

SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-13 Water with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE. This chapter covers: water cycle conservation Explains sources properties and conservation of water. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-13 Water — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE — Chapter-13 Water, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the main source of water on Earth?

A. Rivers
B. Rain ✓
C. Wells
D. Lakes

Answer: B. Rain
Rain is the primary source that replenishes water bodies on Earth. It is an important part of the water cycle.

Which process changes water into water vapour due to heat from the Sun?

A. Condensation
B. Precipitation
C. Evaporation ✓
D. Percolation

Answer: C. Evaporation
Evaporation is the process by which water changes into vapour on heating. The Sun provides the energy for this change.

What happens when water vapour cools and changes into tiny water droplets?

A. Evaporation
B. Condensation ✓
C. Sublimation
D. Filtration

Answer: B. Condensation
Condensation is the process in which water vapour cools and turns into liquid droplets. This leads to cloud formation.

A student keeps an open container of water in the Sun. After some time, the water level decreases. Which process caused this?

A. Condensation
B. Evaporation ✓
C. Precipitation
D. Percolation

Answer: B. Evaporation
Heat from the Sun changes liquid water into vapour, reducing the water level. This is evaporation.

Which of the following is the most appropriate reason for constructing check dams?

A. To increase the speed of river water
B. To store water and improve groundwater recharge ✓
C. To stop rainfall completely
D. To make water evaporate faster

Answer: B. To store water and improve groundwater recharge
Check dams help retain water for a longer time and allow it to seep into the ground. This supports groundwater recharge and water conservation.

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