Question 11

State whether the following statements are True or False. If false, write the correct statement
(a) Water vapour is the gaseous form of water.
(b) Ice is solid whereas snow is the semi-solid form of water.
(c) Ocean water cannot be used for domestic purposes.
(d) Rapid growth of industries is one of the causes for water shortage.

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Solution

(a) True: Water exists in three forms, they are solid, liquid and gas. Ice, water and water vapour are the solid, liquid and gaseous states of water respectively.
(b) False: Ice and snow are solid forms of water.
(c) True: The water present in the ocean is salty and is not fit for human consumption.
(d) True: The increase in the number of industries may lead to water shortage as they use a lot of water for their purpose.

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Question 14

State whether the following statements are True or False. If false, give the correct statement.
(a) The process of water seeping into the ground is called filtration.
(b) 51% of the earth’s surface is covered with water.
(c) Year 2003 was observed as the International Year of Freshwater.
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Q. State whether the following statements are True or False. If false, give the correct statement.
(a) Plants contribute in the water cycle through the process called evaporation.
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Question 12

State whether the following statements are True or False. In case a statement is false, write the correct statement.
1. Sewage is a solid waste which causes water pollution and soil pollution.
2. Used water is wastewater.
3. Wastewater could be reused.
4. Where underground sewerage systems and refuse disposal systems are not available, the high-cost onsite sanitation system can be adopted.

Q. (1)

State whether the following statements are true or false. If false, give the correct statement.

(a) Forests influence climate, water cycle and air quality.

(2)

State whether the following statements are true or false. If false, give the correct statement.

(b) In a forest, trees form the uppermost layer, followed by herbs. The shrubs form the lowest layer of vegetation.

(3)

State whether the following statements are true or false. If false, give the correct statement.

(4)
State whether the following statements are true or false. If false, give the correct statement.

(d) Forests protect the soil from erosion.

Ice is water in solid form whereas water vapour does not contain any water.

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Physical Properties of Water

Standard VII Chemistry

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