Water Pollutants

Q.

List the three major constituents of sewage.

Q.

An untreated human excreta is a health hazard.

True

False

Q.

A lot of fish are dying near a seashore. Describe any two possible causes.

Q.

Define the term sewage.

Q. Mention whether the following statements are True (T) or False (F).
(i) Soil pollution is largely localised. (T/F)

Q.

Which of these diseases may be caused by drinking polluted water?

1. Scabies

2. Tuberculosis

3. Cholera

4. Measles

Q. What are the types of waste water?

Q.

Sewage is mainly generated from which of the following?

1. Offices

2. Hospitals

3. Houses

4. Factories

Q.

What are the bad effects of various festivals on the environment?

Q.

___ is the liquid waste produced due to domestic activities.

Q. A is a point source of water pollution, while is a non-point source of water pollution.

1. residential area
2. drainage pipe
3. water treatment plant
4. sewage treatment plant

Q. State whether true or false:
Oil spills are the only source of water pollutants in ocean water.

1. True
2. False

Q.

Question 6
What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?

Q. Which one of the following is not a bioindicator of water pollution?

1. Sewage fungus
2. Sludge worms
3. Bloodworms
4. Stone flies

Q.

Which one of the following is a "dirty" practice contributing to pollution and seriously needs stoppage by educating the public ?

(a) Too loud marriage musical bands

(b) Disposing of corpses in rivers

(c) Floating lighted earthen lamps ("deeyas") in rivers

(d) Wearing scented/perfumed clothes

Q.

Liquid Kitchen wastes alone constitutes sewage.

Q.

Oil spills are the only source of water pollutants in ocean water.

1. True
2. False

Q. DDT residues are rapidly passed through food chain causing biomagnification because DDT is

1. Non-toxic to aquatic animals
2. water soluble
3. liposoluble
4. moderately toxic

Q.

Household detergents are safe and do not cause water pollution.

1. Excess amount of fertilizers getting drained into water
2. Excess amount of oil spilling into the water body

Q. The Great Pacific Garbage Patch found in the middle of the Pacific Ocean is as large as the state of Texas in the U.S.A.

1. False
2. True

Q. What is eutrophication? Why does it occur?

Q.

The pH of the water sample collected from a river was found to be acidic in the range of $3.5–4.5$, on the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the pH of river water?

1. Soap and detergent factory

2. Lead battery manufacturing factory

3. Plastic cup manufacturing factory

4. Alcohol distillery

Q. The concentration of DDT has increased alarmingly in organisms today. But the highest concentration of DDT is seen in the tertiary consumers. This phenomenon is called ___.

1. biomagnification
2. bio amplification
3. eutrophication
4. biological magnification

Q. What is water pollution? Classify water pollutants.

Q.

What is an open drain system? How does it affect human beings?

Q.

Industrial wastes, oils and fats should not be thrown into the drains because they _____ .

1. Harden and block the pipes

2. Make foul smell

3. Kill the useful microbes

4. Make unhygienic condition

Q. A source of pollution not hard to trace since it is a result of accumulated pollution of a large area.

1. point
2. non-point
3. compound
4. spot

Q. In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

1. S < DE < PE < SE
2. SE < S < PE < DE
3. SE < PE < S < DE
4. PE < S < SE < DE

Q.

Preeti was washing the utensil in which she made tea, she threw the used tea leaves into the sink, what will Preeti observe after some time?

1. None of the above

2. Tea leaves will grow into new plants

3. Tea leaves will harden and block the pipes of the drain

4. Tea leaves will clean the drain

Q. What do pollutants from sewage wastes include?