Water Pollution

Q.

Differentiate between point and non-point sources of water pollution.

Q.

Which of the following does not cause water pollution?

1. Domestic Waste

2. Insecticides and Herbicides

3. Heavy Metals

4. Dissolved Oxygen

Q. The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ions are required to make teeth enamel harder by converting $\left[3C{a}_3\right(P{O}_4{)}_2.Ca\left(OH{)}_2\right]$ to

1. $[3Ca(OH{)}_2.Ca{F}_2]$
2. $Ca{F}_2$
3. $\left[3\right(Ca{F}_2).Ca(OH{)}_2]$
4. $[3C{a}_3(P{O}_4{)}_2.Ca{F}_2]$

Q.

Give any two ways in which a biodegradable substance would affect the environment.

Q.

What are the four major water Pollutants?

Q.

A sample of drinking water was found to be severely contaminated with chloroform (CHCl₃) supposed to be a carcinogen. The level of contamination was 15 ppm (by mass):

(i) express this in percent by mass

(ii) determine the molality of chloroform in the water sample.

Q.

A sample of drinking water was found to be severely contaminated with chloroform, CHCl₃, supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass).

(i) Express this in percent by mass.

(ii) Determine the molality of chloroform in the water sample.

Q. Choose the process by which liquid hydrocarbons can be converted to gaseous hydrocarbons:

1. Hydrolysis
2. Oxidation
3. Cracking
4. Distillation under reduced pressure

Q.

The compound which is used for removing the permanent hardness of water is_______?

1. ${\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}$

2. ${\mathrm{NaHCO}}_3$

3. ${\mathrm{Na}}_2{\mathrm{CO}}_3$

4. ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$

Q. What is DDT among the following –

1. Biodegradable pollutant
2. Greenhouse gas
3. A fertilizer
4. Non-biodegradable pollutant

Q. When huge amount of sewage is dumped in a river, the BOD will:

1. increase
2. decrease
3. increase or decrease
4. remain unchanged

Q. The presence of soluble fluoride ions upto $1\text{ppm}$ in drinking water is:

1. Harmful for teeth
2. Harmful for skin
3. Harmful for bones
4. Safe for teeth

Q.

Read the paragraph and answer the questions following it.

Water is essential for life. Without water, there would be no life. We usually take water as granted for its purity, but we must ensure the quality of water. Pollution of water originates from human activities. Through different paths, pollution reaches to groundwater. Easily identified source or place of pollution is called a point source, e.g.– municipal and industrial discharge pipes, where pollutants enter the water source. Non–point sources of pollution are those where a source of pollution can not be easily identified, e.g.– agricultural runoff, acid rain, etc.

1) How do you classify the various sources of water pollution?

2) What are the point sources of water pollution?

3) Name any two non-point sources of water pollution?

Q. Addition phosphates and nitrates/fertilizers into water leads to _________

1. Eutrophication
2. Increased growth of decomposers
3. All of the above.
4. Reduced algae growth

Q. BOD refers to the ________

1. Binding of Dermatology
2. Biochemical occupied Date
3. Binding of Dirt
4. Biological Oxygen demand

Q.

What is water pollution? List its causes and methods of prevention.

Q.

Phosphate pollution is caused by

1. Sewage and agricultural fertilizers

2. Weathering of phosphate rocks only

3. Agricultural fertilizers only

4. Phosphate rocks and sewage

Q. Lead is mainly considered as:

1. Water pollutant
2. Soil pollutant
3. Air pollutant
4. Radio active pollutant.

Q.

Excess of which of the followings in drinking water is responsible for disease known as ‘Blue Baby Syndrome’ or ‘Methemoglobinemia’?

1. F^-

2. NO₃^-

3. Cl^-

4. SO₄^2-

Q.

Sewage contamination of water is indicated by cysts of:

1. Escherichia

2. Entamoeba

3. Pseudomonas

4. Leishmania

Q.

What are the major causes of water pollution? Explain.

Q.

The Per Capita Demand of Water Is Calculated in Litres

Q.

Have you ever observed any water pollution in your area? What measures would you suggest to control it?

Q.

The two types of water pollution are chemical pollution and biological pollution.

1. True
2. False

Q.

How do plants respond to water deficit?

Q. Persistent pesticides such as DDT pass into food chain and increase the amount per unit weight of organisms due to their accumulation of fat. This phenomenon is called

1. Biomagnification
2. Biosynthesis
3. Decomposition
4. Biodegradation

Q.

Give two uses of potash alum.

Q. Water filled in two glasses A and B have BOD values of 10 and 20, respectively. The correct statement regarding them, is:

1. A is more polluted than B
2. A is suitable for drinking whereas B is not
3. B is more polluted than A
4. Both A and B are suitable for drinking

Q.

Boojho’s uncle has set up an electroplating factory near his village. He should dispose of the waste of the factory

1. In the nearby river

2. In the nearby pond

3. In the nearby cornfield

4. According to the disposal guidelines of the local authority

Q.

Name the bacteria whose presence in river water indicates contamination by disease causing microbes.