Water

Q. All of the following are water harvesting methods, except

1. Digging small pits and lakes
2. Building sand and limestone reservoirs
3. Capturing seasonal flood water from local streams
4. Using underground water for irrigation

Q.
Which of the labelled parts A, B, C and D depicted in the above diagrammatic ideal setting of the khadin system is called saline area?

1. A
2. B
3. C
4. D

Q.

What is watershed management? What are its aims and benefits?

Q.

Define conservation of water.

Q. Saving water by repairing leaky taps is an example of

1. Recycle
2. Reduce
3. Repurpose
4. Reuse

Q. Which of the following is not an advantage of groundwater?

1. It does not evaporate.
2. It recharges wells.
3. It easily gets contaminated.
4. It does not allow growth of flies or mosquitoes

Q.

While ________ your teeth, leaving the ________ running may waste several ________ of water. (tap, litres, brushing, washing, drops)

Q.

List any two traditional water harvesting structures.

Q.

Compare the traditional water harvesting system in hilly and plain regions.

Q.

What is the essential physical substance required for all living organisms?

Q. ______________ is an area of land that separates water flowing to different rivers, basins or seas.

1. Ponds
2. Dams
3. Watershed
4. Artificial well

Q. Given graph shows the pH of water samples collected from different areas (L, M, N, O and P) of a city. Identify the area(s) which receive(s) hard water and select the correct option.

1. L and O only
2. M only
3. N and P only
4. L, N, O and P

Q. What is the pH range of an acidic substance?

1. 0 - 7
2. 1 - 7
3. 7 - 14
4. 1 - 6

Q. Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as 20mg/L, 8mg/L and 400mg/L respectively. Can you assign the correct label to each assuming the river water is relatively clean?

1. Sample A- Sewage treatment plant
   Sample B- River water
   Sample C-Untreated sewage
2. Sample A- Untreated sewage
   Sample B- River water
   Sample C-Sewage treatment plant
3. Sample A- Sewage treatment plant
   Sample B- Untreated sewage
   Sample C-River water
4. Cannot be determined

Q. What is a natural resource? Give an account of different types of natural resources?

Q.

_____ is a precious physical substance which is essential for all living organisms.

1. Water

Q.

Question 34
Is water conservation necessary? Give reasons.

Q. The ancient water harvesting method used in Rajasthan is

1. Surangams
2. Kattas
3. Kulhs
4. Nadis

Q. Water is listed as one of the basic ___.

1. needs for animal and plant life
2. types of fodder
3. forms of matter
4. nutrients

Q. What is the most suitable pH range for fresh water plants and animals?

1. 6.5 - 7.5
2. 3.5 - 5.0
3. 2.0 - 3.5
4. 9.0 - 10.5

Q.

In watershed management which of the following is a primary resource?

Q. Alkaline pH of water indicates that the water_________.

1. is hard
2. is safe for household chores
3. is suitable for washing clothes
4. contains only mineral

Q. Some of the water harvesting methods are

a - Capturing run off water from roof tops.
b - Digging small pits and lakes.
c - Building sand and limestone reservoirs.

Select the correct option.

1. 
   Only a and b are true
2. 
   Only b and c are true
3. 
   Only a and c are true
4. 
   All a, b and c are true

Q.

In which of the following ways can we reduce the water pollution in any river?

1. Treating the sewage waste before dumping it in the river.

2. Finding alternate waste disposal methods.

3. Separating the non-biodegradable waste before dumping them.

4. All of these

Q. Which of the following statement is true with respect to animal conservation?

1. Sanctuary is an artificial habitat for animals and birds.
2. Zoo is a natural habitat for animals and birds.
3. Zoo is an artificial habitat which allows poaching of animals.
4. Sanctuary is a natural habitat for animals and birds.

Q.

In our country, there is a practice of disposing off dead bodies in rivers. Should this be followed?

1. Yes

2. No

Q.

(i) List any five water harvesting structures.
(ii) Write the advantages of water stored in the ground.

Q.

What does the pH measurement of local water body indicate?

Q. Which of the following is the major cause of the pitiable condition of small farmers at Vaddicherla?

1. Soil erosion
2. Water scarcity
3. Low rain fall
4. None of the above

Q. The water suitable for drinking by human beings is called___________ . In_______________method, impure water is allowed to stand undisturbed in a container, which allows insoluble impurities such as mud to settle to bottom. Clean water can thereafter be transferred into at domestic level. Select the correct words to complete the above passage.

1. Pure water, decantation, Sedimentation, Reserve Osmosis.
2. Potable water, Sedimentation, decantation, Reserve Osmosis.
3. Mineral water, Sedimentation, Decantation, UV treatment
4. Potable water , Decantation, Sedimentation, Reserve Osmosis.