Environmental Issues Test

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Environmental Issues Test - 40

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Weekly Quiz Competition

Question 1
1 / -0

What are the factors responsible for pollution of the river?

A
Defecating in the river

B
Throwing garbage, flowers, idols of gods into river

C
Industrial units discharging toxic chemical wastes into the river

D
All of the above

Solution

All of the given options add harmful chemicals and toxins to the water, making it unfit for the habitation of aquatic animals, or use by human beings.
Hence, the correct option is D.
Question 2
1 / -0

Oil spills reduce _________ supplies within the water environment.

A
carbon dioxide

B
oxygen

C
nitrogen

D
none of these

Solution

Oil spills reduce $$\text {oxygen}$$ supplies within the water environment.
Question 3
1 / -0

Which of the following describes the destruction of the ozone by chlorofluorocarbons?

A
CFC contains the chlorine molecule which reacts with ozone (O$$_2$$) molecule and splits into O$$_2$$ and O molecules

B
Contains the chlorine molecule which reacts with oxygen (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

C
CFC contains the fluorine molecule which reacts with ozone (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

D
CFC contains the chlorine molecule which reacts with ozone (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

Solution

The correct answer is 'CFC contains the chlorine molecule which reacts with ozone molecule and splits into O2 and nascent O or Oxygen free radical. The choline is split by the action of sunlight and it causes the reaction move forward.
Question 4
1 / -0

Depletion of ozone layer is mainly due to

A
Methane

B
Carbon dioxide

C
Chloroflorocarbons

D
Nitrogen

Solution

Depletion of ozone layer is mainly due to Chloroflorocarbons.
Note:
The following describes the destruction of the ozone by chlorofluorocarbons.
Chlorofluorocarbons contains the chlorine molecule which reacts with ozone (O$$_3$$) molecule and splits into O$$_2$$ and O molecules.
Chlorofluorocarbons are used in refrigerators, air conditioners and aerosol sprays. They damage the ozone layer of the atmosphere.
Question 5
1 / -0

_____ shields the surface of the earth from ultraviolet (UV) radiation from the sun.

A
Oxygen

B
Nitrogen

C
Ozone

D
Carbon dioxide

Solution

Ozone shields the surface of the earth from ultraviolet (UV) radiation from the sun. Ozone layer reduces the chances of skin cancer.
Question 6
1 / -0

Which of the following conditions lead to formation of ozone?

A
When oxygen molecules absorb ultraviolet photons and undergo photolysis

B
When carbon molecules absorb ultraviolet photons and undergo photolysis

C
When oxygen molecules absorb ultraviolet electrons and undergo photolysis

D
When oxygen molecules absorb ultraviolet neutrons and undergo photolysis

Solution

When oxygen molecules absorb ultraviolet photons and undergo photolysis, ozone is obtained
$$3O_2 \xrightarrow [photolysis]{UV \: light} 2O_3$$.
Question 7
1 / -0

40 to 50% depletion in ozone layer occurs in the .......... polar region

A
North

B
South

C
East

D
West

Solution

40 to 50% depletion in ozone layer occurs in the South polar region.
Ozone is destroyed by collisions with other atoms and molecules.
The large scale destruction of the stratospheric ozone first came into focus in 1987 through the experiments in antarctica.
Question 8
1 / -0

Increased level of carbon dioxide in the atmosphere traps the heat rays reflected by the earth causing an increase in the temperature on the earth. This is

A
Local warming

B
House warming

C
Global warming

D
Country warming

Solution

When carbon dioxide and other air pollutants are collected in the atmosphere they absorb sunlight that has bounced from the earth’s surface. This leads to an increase in the earth's average surface temperature and is called global warming. Carbon dioxide emissions from burning fossil fuels and deforestation are the primary cause of global warming. Thus the correct answer is option C.
Question 9
1 / -0

The main factor responsible for the depletion of ozone layer is addition of _____in the atmosphere.

A
$$Mn$$

B
$$Cl$$

C
$$Na$$

D
$$Co$$

Solution

The main factor responsible for the depletion of ozone layer is addition of Cl in the atmosphere.
Each Cl atom can destroy as many as 100,000 ozone molecules. Cl atoms comes from chlorofluorocarbons.
Question 10
1 / -0

.......... is a farming system with minimal or no use of chemicals such as fertilizers, herbicides, pesticides.

A
Subsistence farming

B
Ley farming

C
Organic farming

D
Industrial farming
Solution
- Organic farming is a form of agricultural practice in which all the natural techniques and products are used such as crop rotation, green manure, compost, and biological pest control instead of chemically synthesized fertilizers or pest control.
- Thus, organic farming is a farming system with minimal or no use of chemicals such as fertilizers, herbicides, pesticides.
- Subsistence farming is the practice of growing crops and raising livestock sufficient only for one's own use, without any surplus for trade.
- Ley farming is the growing of grass or legumes in rotation with grain or tilled crops.
- Industrial farming uses modern technology to promote faster growth and reduce illness and death rates in livestock, creating food products on a mass scale.
So, the correct answer is option C.

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Re-Attempt Weekly Quiz Competition

Environmental Issues Test - 40

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Environmental Issues Test - 40

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SHARING IS CARING

Question 1

Defecating in the river

Throwing garbage, flowers, idols of gods into river

Industrial units discharging toxic chemical wastes into the river

All of the above

Solution

Question 2

carbon dioxide

oxygen

nitrogen

none of these

Solution

Question 3

CFC contains the chlorine molecule which reacts with ozone (O$$_2$$) molecule and splits into O$$_2$$ and O molecules

Contains the chlorine molecule which reacts with oxygen (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

CFC contains the fluorine molecule which reacts with ozone (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

CFC contains the chlorine molecule which reacts with ozone (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

Solution

Question 4

Methane

Carbon dioxide

Chloroflorocarbons

Nitrogen

Solution

Question 5

Oxygen

Nitrogen

Ozone

Carbon dioxide

Solution

Question 6

When oxygen molecules absorb ultraviolet photons and undergo photolysis

When carbon molecules absorb ultraviolet photons and undergo photolysis

When oxygen molecules absorb ultraviolet electrons and undergo photolysis

When oxygen molecules absorb ultraviolet neutrons and undergo photolysis

Solution

Question 7

North

South

East

West

Solution

Question 8

Local warming

House warming

Global warming

Country warming

Solution

Question 9

$$Mn$$

$$Cl$$

$$Na$$

$$Co$$

Solution

Question 10

Subsistence farming

Ley farming

Organic farming

Industrial farming

Solution

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