Water Book Back Questions & Answers
Unit 2 > Science > Class 6 > Samacheer Kalvi - English Medium
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1. Around 97% of water available on earth is water.
a. fresh
b. pure
c. salty
d. polluted
Correct answer: c. salty
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2. Which of the following is not a part of water cycle?
a. evaporation
b. condensation
c. rain
d. distillation
Correct answer: d. distillation
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3. Which of the following processes add water vapour to the atmosphere? i. Transpiration ii. Precipitation iii. Condensation iv. Evaporation
a. ii and iii
b. ii and iv
c. i and iv
d. i and ii
Correct answer: c. i and iv
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4. About 30% of the fresh water is found in?
a. glaciers
b. ground water
c. other sources of water
d.0.3%
Correct answer: b. ground water
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5. Using R.O. plant at home eliminates lot of non-potable water. The best way to effectively use the expelled water of R.O. plant is .
a. make the expelled water go and seep near the bore well
b. use it for watering plants
c. to drink the expelled water after boiling and cooling
d. to use for cooking as the water is full of many nutrients
Correct answer: b. use it for watering plants
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1. Only_____ percent of natural water is available for human consumption.
Correct answer: 0.3
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2. The process of changing water into its vapour is called_____ .
Correct answer: Evaporation.
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3. _____is built on rivers to regulate water fl ow and distribute water.
Correct answer: Dam
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4. Water levels in rivers increase greatly during_____ .
Correct answer: raining
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5. Water cycle is also called as_____ .
Correct answer: Hydrological cycle
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1. Water present in rivers, lakes and ponds is unfi t for use by human beings.
Correct answer: False
Correct Statement: Water present in rivers, lakes and ponds is fit for use by human beings
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2. Seas are formed when the water table meets the land surface.
Correct answer: False
Correct Statement: Ponds are formed when the water table meets the land surface.
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3. The evaporation of water takes place only in sunlight.
Correct answer: FALSE
Correct Statement: water evaporates also in manual heating.
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4. Condensation results in the formation of dew on grass.
Correct answer: True
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5. Sea water can be used for irrigation as such.
Correct answer: False
Correct Statement: Sea water cannot be used for irrigation as such
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1. Flood
Correct answer: Increased rain fall
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2. Surface water
Correct answer: Lake
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3. Sun light
Correct answer: Evaporation
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4. Cloud
Correct answer: Water vapour
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5. Frozen water
Correct answer: Pole
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1. Population explosion : Water scarcity :: Recycle :_____
Correct answer: Water management
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2. Ground water :_____ :: Surface water : lakes
Correct answer: Tube wells