Chapter-13 Water — Online MCQ Test
SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board
Practice Chapter-13 Water with a free chapter-wise online MCQ test.
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.
Chapter-13 Water — Important Questions & Answers
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.
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.
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.
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.
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.
Check dams help retain water for a longer time and allow it to seep into the ground. This supports groundwater recharge and water conservation.