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1. Question marks are mentioned with each Question.
2. Please write neat and clean hand-writing on Answer Sheet. Use Margin on right side and left side of Answer Sheet.
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4. Do not click the button Submit Test before completing the paper on Answer Sheet.
5. This is a ONE TIME attempt test. Once started, it cannot be reversed or attempted again.
6. Take photo of all the Sheets and make single pdf file.
1
How can we recognise the presence of pollutants in the water ?
Bad taste of drinking water.
Offensive odour in water
Unchecked growth of aquatic weeds in water bodies.
All of these.
2
The spider plant fights against _________________________.
Carbon monoxide
Formaldehyde
Benzene
3
What are the methods of conservation of water on a large scale ?
Rain water should be harvested.
Industrial waste water should be properly treated and recycled.
Floods should be controlled by constructing dams.
4
Sewage treatment plants are made for this purpose where sewage is stored in ___________________ for some time.
Large tanks
Small tanks
Pipes
None of these.
5
In sewage treatment plants, _________________ are oxidized into harmless substances.
Harmful compounds
Useful compounds
Waste compounds.
6
What are the methods of Conserving Water at Individual level ?
Avoid using shower.
While brushing your teeth, do not leave the tap open.
Do not use drinking water to clean your car.
7
Which of the following chemical in water affects teeth and bones ?
Ammonia
Carbon
Flourides
8
How can we reduce water pollution ?
Reduce the quantity of waste water.
Use low capacity flushes in toilets
Do not throw solids like, leaves, cotton, polythene bags etc in drains.
9
Which of the following plant can reduce air pollution ?
Aloe vera
Spider plant
Snake plant
10
Which of the following are correct :
(a) Potable water is clear, colourless, pleasant to taste and is free from disease, germs and impurities.
(b) Potable water contains dissolved gases like oxygen and carbon dioxide.
Only (a) is correct.
Only (b) is correct.
Both (a) and (b) are correct.
11
(a) Aloe vera extract aids in healing cuts, burns and skin problems.
(b) The effects of air pollution on plants are widely seen and damage all plants including our food crops and trees.
12
(a) Industrial wastes should be recycled and used again.
(b) Proper toilet facilities should be provided to rural people.
13
(a) Sewage should not be released directly into rivers or lakes. They should be properly treated in sewage treatment plants.
(b) Harmful chemicals should not be dumped into water bodies. They should be transformed into some useful substances.
14
(a) The waste water from hospitals could contain harmful chemicals and different types of disease-causing microorganisms.
(b) Pesticides can poison fish as well as the animals (including human) that eat them.
(c) Larger quantities of heated water is discharged in ponds, lakes and rivers.
Only (a) and (b) are correct.
Only (b) and (c) are correct.
Only (a) and (c) are correct.
15
(a) Do not throw cooking oil in the drain. It hardens and blocks the pipes of sewerage system.
(b) Do not throw solids like, leaves, cotton, polythene bags etc. in the drains. These choke the drains.
(c) Use low capacity flushes in toilets to reduce water tank is flushed down toilets.