Freshwater and Saltwater

Q.

Define pedogenesis.

Q. What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.

Q.

What is groundwater? Name the main source of groundwater.

Q.

Rain is the ultimate source of water.

1. True
2. False

Q.

Which is the primary source of water?

Q. Which of the following water is not fit for drinking?

1. Saline Water
2. Potable Water
3. Distilled water
4. None of these

Q.

Question 8 (d)

Fill up the blanks
Impurities settled at the bottom when muddy water was kept overnight in a bucket.
The clear water was then poured off from the top. The process of separation used in this example is called ___.

Q. ___ is the purest form of natural water.

1. Underground water
2. Ocean water
3. Rain water
4. River water

Q. Water that is found underground in the cracks and spaces in soil an rocks is called?

Q.

We know that $\frac{3}{4}th$ of the Earth's surface is filled with water. Then why should we conserve water? [3 MARKS]

Q.

Differentiate between the following: Well water and Springwater.

Q.

Clean water is water free of germs and chemicals and it must not be cloudy.

1. True

2. False

Q.

Saline water is good for drinking and cooking.

1. True

2. False

Q.

Question 21

Alist of jumbled words are given here. Write the correct form of each word
(a) WASHFERRET
(b) CHARREGE
(c) QUIFERA
(d) WOSN

Q.

Question 2

Seas and oceans are full of water on earth. However, a very small percentage of water present on earth is available for us. This percentage is roughly
(a) .006%
(b) 0.006%
(c) 0.6%
(d) 6%

Q.

Question 1 (a)
Mark ‘T’ if the statement is true and ‘F’ if it is false.
(a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world.

Q. In which year was 'Ganga Action Plan' launched?

1. 1986
2. 1985
3. 1988
4. 1990

Q. Some river originate from sea , therefore there water is fit for drinking or not?

Q.

Answer the following: [3 MARKS]

(a) When is it useful to apply sedimentation and decantation?
(b) Give two examples where these methods are used?
(c) Explain the process.

Q. The purest form of water is

(a) lake water
(b) river water
(c) sea water
(d) rain water

Q. In India many people do not have the access to safe drinking water, what appears safe is just clear water. So what is safe drinking water according to you?

1. Water which is odourless.
2. Water which is free from micro organisms.
3. Water which is free from dissolved impurities.
4. All the above.

Q.

Ganga action plan was launced in 1985.

1. True
2. False

Q. The third largest ocean of the World is

1. Ocean of Antarctica
2. Atlantic Ocean
3. Indian Ocean
4. Arctic Ocean

Q. Contaminants make water unfit for drinking.

1. \N
2. \N

Q. The ultimate source of water on the earth is

1. spring and wells
2. rain
3. oceans and seas
4. rivers and lakes

Q. The third largest ocean of the World is

1. Indian Ocean
2. Arctic Ocean
3. Atlantic Ocean
4. Ocean of Antarctica

Q.

Glaciers and ice sheets present on poles of the earth contain solid form of water.

1. True

2. False

Q.

Describe in detail the following term. Rainwater

Q. Living beings can survive without water.

1. True
2. False

Q.

Cleaning of water is a process of removing ____________.