Environmental Issues Test

Result

Environmental Issues Test - 81

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Peeling of ozone umbrella is due to

A
CFCs

B
PAN

C
$$CO_2$$

D
Coal burning

Solution

Among the five layers of the earth's atmosphere, ozone is present in the stratosphere which absorbs UV radiation before it reaches the ground. The main cause of ozone depletion is manufactured chemicals especially CFCs, these compounds reach the stratosphere by winds, where they release halogen atoms through photodissociation and cause the breakdown of ozone into oxygen. The ozone hole formed due to this increase the exposure of direct UV rays on earth carrying the potential risk of skin cancer and other negative effects
So, the correct answer is 'CFCs'
Question 2
1 / -0

BOD is measure of.

A
Industrial waste being poured in water body

B
Extent of pollution with organic compounds

C
CO combined with haemoglobin

D
$$O_2$$ required by green plants during night

Solution

The microorganisms in polluted bodies use dissolved oxygen to metabolise organic matter in polluted waters. This is called biochemicalical oxygen demand. The more organic matter in sewage and polluted bodies, greater the BOD and hence less oxygen is left availble tor higher animals like fishes.
Question 3
1 / -0

DDT concentration recorded in human body has been

A
$$0.3-0.7$$ ppm

B
$$1.3-3.1$$ ppm

C
$$13-31$$ ppm

D
$$30-70$$ ppm

Solution

DDT is basically an organochlorine pesticide. It was originally used for insecticides to prevent the crop from being damaged by insects, rodent, weeds etc. but due to its harmful effect it has been globally banned by "Stockholm convention on Persistent organic pollutant, 2001". By its nature, it is insoluble in water and shows high solubility in the fat of animals. They do not degrade easily and accumulate within the body of the organism in fat deposited portion. Due to their ability to show the biomagnification, they show the highest concentration in the top carnivore, like humans where its concentration is 13-31 ppm
So, the correct answer is '13-31 ppm'
Question 4
1 / -0

Ozone hole is caused by

A
Acetylene

B
Ethylene

C
Chlorofluorocarbons

D
Methane

Solution

Ozone hole refers to the depletion of the ozone layer present in the stratosphere of the atmosphere. The chlorofluorocarbons are the paraffinated halogens that enter the stratosphere with winds and split up when exposed to the UV rays. They release reactive chlorine which further reacts with the ozone to release diatomic oxygen. The ozone hole shows a low concentration of ozone which is less than 220 DU. It is more prominent over Antarctica due to polar vortex and formation of the polar stratospheric clouds.
Hence, the correct answer is 'Chlorofluorocarbons'.
Question 5
1 / -0

Phosphate pollution is caused by _______.

A
Weathering of phosphate rocks only

B
Agriculture fertilizers

C
Phosphate rocks and sewage

D
Sewage and agricultural fertilizers

Solution

Phosphate pollution in the water is directly related to the release of the untreated sewage and agriculture fertilizers into the water body. This results in excessive algal bloom that forms a thick layer on the surface of the water and prevents the sunlight and oxygen from getting into the water. As a result, the underlying aquatic animals and plants suffocate and die. When this algal bloom dies, it further enhances the eutrophication process, greatly decreasing the dissolved oxygen in the water.
Hence, the correct answer is 'Sewage and agricultural fertilizers'.
Question 6
1 / -0

A water body has high BOD indicating that water is

A
Being contaminated with sewage

B
Being aerated

C
Receiving minerals

D
Atrophic

Solution

Biological Oxygen Demand indicates the increase in presence of organic matter in the water body. High BOD indicates the great amount of organic matter. The dissolved oxygen in water is consumed by bacteria to decompose the organic matter of sewage or other discharges thereby depleting the oxygen of the water body. The decrease in oxygen can kill the aquatic life in water body.
Hence, the correct answer is 'Being contaminated with sewage'.
Question 7
1 / -0

Result of ozone hole is

A
Green house effect

B
Global warming

C
Acid rain

D
UV radiations reach the earth

Solution

Ozone is found in high concentration in the stratosphere of the earth's surface in the form of ozone blanket or commonly known as the ozone layer. The vital function of ozone is to absorb the sun's ultraviolet radiation before it reaches the ground hence protecting the earth from its harmful effect. But the ozone-depleting substance such as Chlorofluorocarbons, nitrous oxides, etc that reacting with the ozone layer cause depletion of it forming ozone hole.
Hence, the correct answer is 'UV radiations reach the earth'.
Question 8
1 / -0

Melanin protects us from

A
X-rays

B
Infra-red rays

C
Visible rays

D
UV rays

Solution

The intermediary lobe of the pituitary gland secreted the Melanocyte Stimulating Hormone (MSH) that acts on the types of cells in the skin called the melanocytes. These cells produce a coloured pigment called the melanin which diverts the UV-A radiations falling on the skin. This prevents the UV rays from reaching to the other sensitive cells of the body and prevents the possible damages to the DNA that can be caused by them. This is the reason that body develops tanning when exposed to the bright sunlight. It is a protective mechanism.
Hence, the correct answer is 'UV rays'.
Question 9
1 / -0

Chlorofluorocarbons are not being used in refrigerators because they

A
Increase temperature

B
Cause allergic reactions

C
Deplete ozone

D
Both A and B

Solution

Among the five layers of the earth's surface ozone is present in the stratosphere which absorbs UV radiation before it reaches the ground. The main cause of ozone depletion is manufactured paraffinated halogen chemicals especially CFCs, these compounds reach the stratosphere by winds, where they release halogen atoms through photodissociation and cause the breakdown of ozone into oxygen. The ozone hole formed due to this increase the exposure of direct UV rays on earth carrying the potential risk of skin cancer and other negative effects.
Hence, the correct answer is 'Deplete ozone'.
Question 10
1 / -0

Role of CFC present in atmosphere is

A
Reduction in ozone

B
Ozone formation

C
Formation of leghaemoglobin

D
Enhance chlorophyll formation

Solution

The ozone layer is part of the earth's atmosphere. Ozone is basically found in the stratosphere. Ozone layer contains the high concentration of ozone. It's is vital to human life on earth because it absorbs biologically harmful ultraviolet radiations from the sun. Direct exposure to such rays can cause serious illness and skin problems. The main cause of ozone depletion is manufactured chemicals especially CFCs, these compounds reach the stratosphere by winds, where they release halogen atoms through photodissociation and cause the breakdown of ozone into oxygen. The ozone hole formed due to this increase the exposure of direct UV rays on earth carrying the potential risk of skin cancer and other negative effects.
Hence, the correct answer is 'Reduction in ozone'

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Environmental Issues Test - 81

Result

Environmental Issues Test - 81

Score

-

Rank

-

SHARING IS CARING

Question 1

CFCs

PAN

$$CO_2$$

Coal burning

Solution

Question 2

Industrial waste being poured in water body

Extent of pollution with organic compounds

CO combined with haemoglobin

$$O_2$$ required by green plants during night

Solution

Question 3

$$0.3-0.7$$ ppm

$$1.3-3.1$$ ppm

$$13-31$$ ppm

$$30-70$$ ppm

Solution

Question 4

Acetylene

Ethylene

Chlorofluorocarbons

Methane

Solution

Question 5

Weathering of phosphate rocks only

Agriculture fertilizers

Phosphate rocks and sewage

Sewage and agricultural fertilizers

Solution

Question 6

Being contaminated with sewage

Being aerated

Receiving minerals

Atrophic

Solution

Question 7

Green house effect

Global warming

Acid rain

UV radiations reach the earth

Solution

Question 8

X-rays

Infra-red rays

Visible rays

UV rays

Solution

Question 9

Increase temperature

Cause allergic reactions

Deplete ozone

Both A and B

Solution

Question 10

Reduction in ozone

Ozone formation

Formation of leghaemoglobin

Enhance chlorophyll formation

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.