Environmental Issues Test

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Environmental Issues Test - 58

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Weekly Quiz Competition

Question 1
1 / -0

Number of ozone depleters identified by Viena convention for Protection of Ozone Layer (1992) is

A
19

B
17

C
15

D
13
Solution
- The Vienna Convention for the Protection of the Ozone Layer is a multilateral environmental agreement signed in 1985.
- It provided frameworks for international reductions in the production of chlorofluorocarbons due to their contribution to the destruction of the ozone layer and the resulting increase in the threat of skin cancer.
- The Number of ozone depleters identified by Viena convention for Protection of Ozone Layer (1992) is 19.
- So, the correct answer is '19'.
Question 2
1 / -0

Limit of BOD prescribed by Central Pollution Control Board for discharge of industrial and municipal waste waters into natural surface waters is

A
$$< 3.0$$ ppm

B
$$< 10$$ ppm

C
$$< 30$$ ppm

D
$$< 100$$ ppm

Solution

BOD or Biochemical oxygen demand is the amount of oxygen required to decompose the organic matter in one litre of polluted water. More BOD means more organic matter is present in the water. Hence, a high BOD value means that the water is heavily polluted.
According to Central Pollution Control Board, limit of BOD for discharge of industrial and municipal waste waters into natural surface waters is less than 10 ppm i.e. < 10 ppm.
So, the correct answer is '< 10 ppm'
Question 3
1 / -0

If global warming continues, organism facing severe threat is?

A
Banana

B
Dolphin

C
Cow

D
Snow Leopard

Solution

Global warming is the continuous increase in temperature of earth's surface due to increase in concentration of greenhouse gases. The rise in temperature leads to melting of polar ice caps and this will lead to rise in sea level, due to which many coastal areas will get submerged.
Hence, if global warming continues, Snow Leopard will face severe threat as ice will melt due to global warming and its natural habitat will get destroyed.
So, the correct answer is 'Snow Leopard'.
Question 4
1 / -0

One green house gas contributes $$14\%$$ to total global warming and another contributes $$6\%$$. These are respectively identified as

A
$$NO_2$$ and $$CO_2$$

B
CFC and $$N_2O$$

C
Methane and $$CO_2$$

D
Methane and CFCs

E
CFCs and $$CO_2$$

Solution

The warming of earth's surface when sun radiations are absorbed and trapped in earth's atmosphere, is called greenhouse effect. The gases responsible for green house effect are called green house gases which trap the radiations and don't let them reflect back from the earth's surface. The green house gases are Chlorofluorocarbons (CFC's), Carbon dioxide (CO₂), Methane (CH₄) and Nitrous Oxide (N₂O).
The approximate percentage of different greenhouse gases in the atmosphere is:
CFCs - 14%
CO₂ - 60%
‎CH₄ - 20%
N₂O - 6%
So, the correct answer is 'CFC and N₂O'.
Question 5
1 / -0

BOD of eutrophied lake will be

A
Lower

B
Moderate

C
Higher

D
Same as any other lake

Solution

Eutrophication is the phenomenon of nutrient enrichment of nitrogen and phosphorus in a water body that supports a dense growth of plants and animal life. Due to nutrient enrichment, excess growth of algae occurs which is called algal bloom. When these algae die, their organic matter gets decomposed and this results in the depletion of oxygen leading to death of aquatic animals. This process is called eutrophication.
Biochemical oxygen demand or BOD is the amount of oxygen required to decompose organic matter in one litre of polluted water.
Hence, BOD of a eutrophied lake will be higher as it will have more organic matter and more oxygen will be needed to decompose it.
So, the correct answer is 'Higher'.
Question 6
1 / -0

Maximum ozone depletion is caused by

A
$$CO_2$$

B
CFC

C
$$SO_2$$

D
$$CH_4$$

Solution

The primary cause for ozone depletion are CFCs. CFCs or Chlorofluorocarbons are the compounds that contain carbon and hydrogen along with chlorine and fluorine. They are used as refrigerants and in air conditioners. CFCs release chlorine radicals that react with ozone and cause its degradation. The mechanism of ozone depletion by CFC is as follows:
UV- C
CFCl₃ ----------------> CFCl₂ + Cl
UV-C
CFCl₂ -----------------> CFCl + Cl
Cl + O₃ ----------------> ClO + O₂
ClO + O₃ --------------> Cl + 2O₂
Hence, CFC causes degradation of ozone. Also, the chlorine atom remains in the atmosphere and reacts with another molecule of ozone.
So, the correct answer is 'CFC'.
Question 7
1 / -0

Biochemical oxygen demand in a river water

A
Remains unchanged when algal bloom occurs

B
Increases when sewage gets mixed up with river water

C
Has no relationship with concentration of oxygen in water

D
Gives a measure of Salmonella in water

Solution

Biochemical oxygen demand or BOD is the amount of oxygen required to decompose organic matter in one litre of polluted water.
If the water is more polluted, more will be the BOD because more will be the organic matter present in it and hence, more oxygen will be required to decompose it.
Hence, BOD in a river water will increase if sewage gets mixed up with the river water because more organic matter will be added in the river.
So, the correct answer is 'Increases when sewage gets mixed up with river water'.
Question 8
1 / -0

Nitrogen oxides released in the stratosphere cause ozone depletion due to

A
Catalysing conversion of ozone to oxygen

B
Binding ozone

C
Reacting with ozone

D
All of the above

Solution

Nitrogen oxide which causes ozone depletion is Nitrous oxide. It is similar to CFCs in that it is stable when it is released in the troposphere but when it reaches stratosphere, it releases ozone depleting substances which react with ozone and cause its degradation through nitrogen-oxide catalysed reaction.
So, the correct answer is 'Reacting with ozone'.
Question 9
1 / -0

High BOD indicates

A
Highly polluted water

B
Less pollution in water

C
Less sewage

D
Less microorganisms

Solution

BOD or the Biological Oxygen Demand that is created when there is a large concentration of the organic matter in the water. To decompose this organic mass, the decomposing bacteria will be activated and there would be consumption of the dissolved oxygen in this process. So, more the organic matter, higher will be the BOD and as a result more will be the pollution in the water body. This causes severe decrease in the dissolved oxygen and kills the aquatic animals.
Hence, the correct answer is 'Highly polluted water'.
Question 10
1 / -0

A movement similar to Chipko which has spread in South is

A
Uliso

B
Appiko

C
Belesu

D
Balasu

Solution

The Chipko Movement was launched by Chandi Prasad Bhatt and Sunder Lal Bahuguna in 1973, against large scale cutting of trees by timber contractors in the Uttarakhand hills. The movement started in Chamoli district of Garhwal region in Uttarakhand. Local hill women from villages were organised and made aware of ecological threat in the hills. They actively participated in the campaign. They embraced or hugged the trees when the timber contractors reached and forced them to leave. This novel campaign for saving hill forests and greenery spread all along the hill region and to Karnataka in South also in 1983. In Karnataka, it was named as Apikko movement which was started by Appu and Mamtha in a small village named Gubbi Gadde near Sirsi.
So, the correct answer is 'Apikko'.

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Environmental Issues Test - 58

Result

Environmental Issues Test - 58

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SHARING IS CARING

Question 1

19

17

15

13

Solution

Question 2

$$< 3.0$$ ppm

$$< 10$$ ppm

$$< 30$$ ppm

$$< 100$$ ppm

Solution

Question 3

Banana

Dolphin

Cow

Snow Leopard

Solution

Question 4

$$NO_2$$ and $$CO_2$$

CFC and $$N_2O$$

Methane and $$CO_2$$

Methane and CFCs

CFCs and $$CO_2$$

Solution

Question 5

Lower

Moderate

Higher

Same as any other lake

Solution

Question 6

$$CO_2$$

CFC

$$SO_2$$

$$CH_4$$

Solution

Question 7

Remains unchanged when algal bloom occurs

Increases when sewage gets mixed up with river water

Has no relationship with concentration of oxygen in water

Gives a measure of Salmonella in water

Solution

Question 8

Catalysing conversion of ozone to oxygen

Binding ozone

Reacting with ozone

All of the above

Solution

Question 9

Highly polluted water

Less pollution in water

Less sewage

Less microorganisms

Solution

Question 10

Uliso

Appiko

Belesu

Balasu

Solution

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