Water

Samacheer Book Back Questions And Answers For Science Standard 6 Term 3 “Water“

I. Choose the correct Answer:
1. Around 97% of water available on earth is water.
(a) fresh
(b) pure
(c) salty
(d) polluted

2. Which of the following is not a part of the water cycle?
(a) evaporation
(b) condensation
(c) rain
(d) distillation

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

4. About 30% of the freshwater is found in?
(a) glaciers
(b) groundwater
(c) other sources of water
(d) 0.3%

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

II. Fill in the Blanks:
1. Only _____ percent of natural water is available for human consumption.
2. The process of changing water into its vapour is called _____.
3. _____ is built on rivers to regulate water flow and distribute water.
4. Water levels in rivers increase greatly during _____.
5. Water cycle is also called as _____.

Answers:
1. 0.3%
2. Evaporation
3. Dam
4. Rainy days
5. Hydrological cycle

III. True or False. If False, give the correct statement:
1. Water present in rivers, lakes and ponds is unfit for use by human beings.
2. Seas are formed when the water table meets the land surface.
3. The evaporation of water takes place only in sunlight.
4. Condensation results in the formation of dew on grass.
5. Sea water can be used for irrigation as such.

Answers:
1. False (Water present in rivers, lakes and ponds is fit for use by human beings)
2. True
3. False (The evaporation of water takes place in all types of heat)
4. True
5. False (Sea water cannot be used for irrigation as such)

IV. Match the following:
1. Flood                  A. Lake
2. Surface water      B. Evaporation
3. Sun light             C. Water vapour
4. Cloud                  D. Pole
5. Frozen water       E. Increased rain fall

Answers:
1. E
2. A
3. B
4. C
5. D

V. Arrange the following statements in the correct sequence:
1. These vapours condense to form tiny droplets of water.
2. The water droplets come together to form large water droplets.
3. The heat of the sun causes evaporation of water from the surface of the earth, oceans, lakes, rivers and other water bodies.
4. The large water droplets become heavy and the air cannot hold them, therefore, they fall as rains.
5. Water vapour is also continuously added to the atmosphere through transpiration from the surface of the leaves of trees.
6. Warm air carrying clouds rises up.
7. Higher up in the atmosphere, the air is cool.
8. These droplets floating in the air along with the dust particles form clouds.

Answers:
1. The heat of the sun causes evaporation of water from the surface of the earth, oceans, lakes, rivers and other water bodies.
2. Water vapour is also continuously added to the atmosphere through transpiration from the surface of the leaves of trees.
3. These droplets floating in the air along with the dust particles form clouds.
4. Warm air carrying clouds rises up.
5. Higher up in the atmosphere, the air is cool.
6. These vapours condense to form tiny droplets of water.
7. The water droplets come together to form large water droplets.
8. The large water droplets become heavy and the air cannot hold them, therefore, they fall as rains.

VI. Analogy:
1. Population explosion: Water scarcity:: Recycle:_____
2. Groundwater: _____:: Surface-water: Lakes

Answers:
1. Water management
2. Wells

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