Environmental Issues Test

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Environmental Issues Test - 56

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following industries are responsible for water pollution?

A
Oil refineries

B
Chemical factories

C
Textile and sugar mills

D
All of these

Solution

Oil refineries, chemical factories, textile and sugar mills are responsible for water pollution. These industries discharge harmful chemicals into rivers and streams and pollute water.
Question 2
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Afforestation in relation to urban development is component of

A
Social forestry

B
Integrated forest development

C
Agroforestry

D
Fuel forestry
Solution
- Afforestation is the process of planting trees, or sowing seeds, in a barren land devoid of any trees to create a forest. The term should not be confused with reforestation, which is the process of specifically planting native trees into a forest that has decreasing numbers of trees.
- Hence Afforestation in relation to urban(cities) development is a component of Integrated forest development.
- So, the correct answer is 'Integrated forest development'.
Question 3
1 / -0

Ultraviolet radiations from sunlight causes a reaction that produce.

A
Fluorides

B
Carbon monoxide

C
Sulphur dioxide

D
Ozone

Solution

Ultraviolet radiations cause photochemical splitting of oxygen molecules in the stratosphere. The nascent oxygen combines with molecular oxygen to form ozone. In troposphere nascent oxygen comes from nitrogen dioxide.
Question 4
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Radioactive Sr-$$90$$ can enter and accumulate in human body through _______.

A
Breathing in contaminated air

B
Drinking water

C
Soil

D
Food chain

Solution

Strontium-90 is the radioactive fissile material that has a half-life of 28 years. It readily enters into the food chain from the soil when absorbed by the plants. Its persistent nature results in the biomagnification. Like any other radioactive waste, it is also either dumped in the soil or in the water. In both the conditions, it finds its way to the food chain by getting absorbed by the producers. It causes severe ailments especially in children like leukaemia and bone cancer.
Hence, the correct answer is 'Food chain'
Question 5
1 / -0

Checking of re-radiation heat by atmospheric dust, $$O_3, O_2$$ and water vapours is

A
Ozone layer effect

B
Solar effect

C
Radioactive effect

D
Green house effect

Solution

The greenhouse effect can be defined as the trapping of radiations of the sun by the tropospheric gases and preventing these radiations from reflecting back to space. The tropospheric gases involved are atmospheric dust, Ozone, Carbon dioxide and water vapour. These gases are responsible for causing global warming.
A. Ozone layer effect occurs in stratosphere only because of ozone.
B. Solar effect is caused due to solar flares.
C. The radioactive effect is due to radioactive elements like uranium and plutonium.
D. The greenhouse effect is due to greenhouse gases.
Hence, the correct answer is 'Greenhouse effect.'
Question 6
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Continuous sewage flow into a stream would lead to

A
Eutrophication

B
Algal bloom

C
Depletion of oxygen

D
Increase in temperature

Solution

Discharge of untreated sewage into streams which contains high quantity of nutrients induce the disproportionate growth of algae causing eutrophication which results into depletion of dissolved oxygen in the water. The continuous flow of sewage reduces the self-purification capacity of the water body. The condition of hypoxia arises due to depletion of oxygen. Increase in temperature favours the eutrophication and algal bloom is the cause of eutrophication. Depletion of oxygen is the adverse effect of the eutrophication.
Hence, the correct answer is 'Depletion of oxygen'.
Question 7
1 / -0

Drained sewage has B.O.D.

A
More than that of water

B
Less than that of water

C
Equal to that of water

D
None of the above

Solution

BOD refers to the biological oxygen demand by the microbes to decompose the organic matter present in the water body. The drained sewage is rich in organic waste that will be decomposed by the bacteria. So, the drained sewage will be deficient in oxygen than the normal water. The oxygen demanded by the microbes will be higher in sewage water.
Hence, the correct answer is 'More than that of water'.
Question 8
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Ozone depletion in stratosphere shall result in.

A
Forest fires

B
Increased incidence of skin cancer

C
Global warming

D
None of the above

Solution

Ozone depletion in Stratosphere shall result in infiltration of UV A and UV B rays that would result in increased incidents of skin cancer
So, the correct answer is'Increased incidence of skin cancer'
Question 9
1 / -0

BOD is

A
Biological oxygen deficit

B
Biosphere oxygen demand

C
Biological oxygen demand

D
None of the above

Solution

BOD refers to the Biological Oxygen Demand. It refers to the amount of the oxygen required by the aerobic bacteria to decompose the organic compounds present in the water body. If the BOD of a water body is low, it is considered to be less polluted. The high BOD shows a large level of pollution because more organic pollutants are present now and the bacteria will need more oxygen to decompose them.
Hence, the correct answer is 'Biological Oxygen Demand'.
Question 10
1 / -0

Concentration of green house gases is increasing due to

A
Deforestation

B
Increased use of refrigerators

C
Increased combustion of coal and petroleum

D
All of the above

Solution

The greenhouse gases are capable of trapping and reflecting the sun's radiations on the earth's surface. Examples include carbon dioxide, methane, nitrous oxides etc. These are naturally released by activities like volcanic eruptions, forest fires, respiration etc. But their increased levels have occurred due to the anthropogenic activities like deforestation, increased use of refrigerators (releasing CFCs) and increased combustion of coal and petroleum (releasing oxides of nitrogen, sulphur and carbon). Because of the increase in their levels, they have caused climate change by global warming.
Hence, the correct answer is 'All of the above'.

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Re-Attempt Weekly Quiz Competition

Environmental Issues Test - 56

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Environmental Issues Test - 56

Score

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Rank

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SHARING IS CARING

Question 1

Oil refineries

Chemical factories

Textile and sugar mills

All of these

Solution

Question 2

Social forestry

Integrated forest development

Agroforestry

Fuel forestry

Solution

Question 3

Fluorides

Carbon monoxide

Sulphur dioxide

Ozone

Solution

Question 4

Breathing in contaminated air

Drinking water

Soil

Food chain

Solution

Question 5

Ozone layer effect

Solar effect

Radioactive effect

Green house effect

Solution

Question 6

Eutrophication

Algal bloom

Depletion of oxygen

Increase in temperature

Solution

Question 7

More than that of water

Less than that of water

Equal to that of water

None of the above

Solution

Question 8

Forest fires

Increased incidence of skin cancer

Global warming

None of the above

Solution

Question 9

Biological oxygen deficit

Biosphere oxygen demand

Biological oxygen demand

None of the above

Solution

Question 10

Deforestation

Increased use of refrigerators

Increased combustion of coal and petroleum

All of the above

Solution

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