Environmental Chemistry Test

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Environmental Chemistry Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Among the following the wrongly matched statement regarding the use of chemical fertilizers and pesticides is

A
They are eco-friendly

B
The field turn barren after some time

C
Adversely affect the useful component from the soil.

D
They destroy soil fertility

Solution

The chemical fertilisers and pesticides contain harmful chemicals for removal of the insects and pests. These chemicals cause degradation of the soil and turn the land barren after prolonged use. They affect the nutrient content and organisms in the soil. They reduce the soil fertility and they are not eco-friendly.
Thus, the correct answer is option A.
Question 2
1 / -0

The factor responsible for depletion of ozone layer is

A
Excessive use of automobiles

B
Excessive industrial units

C
Excessive use of man made compounds containing chlorine and fluorine

D
Excessive deforestation

Solution

Chlorofluorocarbon compounds are released from automobiles, refrigerators, etc. These compounds cause an increase in atmospheric temperature causing global warming.
So, option C " Excessive use of man-made compounds containing chlorine and fluorine" is the correct answer.
Question 3
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The ozone layer: Between 15 and 50 km above the earth is a thin layer of gas called 'ozone'. It protects the earth from most of the sun's harmful ultraviolet radiation. Too much radiation causes blindness in animals and skin cancer in people. In 1985, scientists discovered a hole in the ozone layer in the Antartica. They have recently discovered a smaller hole over the arctic. The ozone layer is also becoming thinner over other locations of the earth too. Scientists believe that over the last 10 years about 30% of the ozone layer has disappeared. This damage is caused by chemicals. Choose the right statement(s) from the following.

A
The greenhouse effect would be more efficient and the temperature of earth would increase.

B
CFCs would result in the depletion of the ozone layer.

C
Infrared radiation from the sun would bombard earth.

D
Ultraviolet radiation from the sun cannot enter earth.

Solution

The presence of CFCs in the atmosphere results in the depletion of the ozone layer. They are used as coolants in refrigerators, coolers, etc. The CFCs causes the breaking of the ozone molecule which forms the oxygen radical and O$$_2$$. The depletion of the ozone layer results in the penetration of the harmful UV radiations from the sun into the Earth's atmosphere.
Thus, the correct answer is option B.
Question 4
1 / -0

Maximum threat to the world is from

A
Global warming

B
Ozone hole

C
Water pollution

D
Soil erosion

Solution

Maximum threat to the world is from ozone layer which is found in the stratosphere. This layer acts as a shield absorbing UV radiations from the sun. For the ozone layer to be intact there has to be a balance between the production and degradation which has been disturbed by the CFCs used in refrigerators. The F and Cl, which are released by these compounds results in the thinning out of the ozone layer also known as the ozone hole. It causes threat to life and environment as it leads to skin aging and cancers, snow blindness, cataract, melting of polar ice caps, global warming etc.
So, the correct answer is 'Ozone hole'
Question 5
1 / -0

UV light radiation cause

A
Formation of pyrimidines

B
Photodynamic action

C
Breakage of hydrogen bonds in DNA

D
Protein denaturation

Solution

The UV radiations can cause mutation in the cells by altering the DNA. These are ionising radiations which can damage the structure of the DNA molecule. The UV rays can result in the formation of thymine dimers or split the hydrogen bonding. This results in distortion in the structure of DNA and the cell dies due to malfunctioning of the genetic material.
Thus, the correct answer is option C.
Question 6
1 / -0

The presence of ozone in the atmosphere of earth

A
Is advantageous since it supplies O$$_2$$ for people travelling in jets

B
Helps in checking the penetration of ultraviolet rays to earth

C
Hinder higher rate of photosynthesis

D
Has been responsible for increasing the average global temperature in recent years

Solution

Ozone gas forms a layer in the atmosphere. this layer of ozone absorbs the harmful ultraviolet rays of the sun. These rays are then reflected in space and prevented from reaching the earth. Thus, living organisms on earth are protected from the harmful effects of UV rays like skin diseases, cancer, death of aquatic organisms etc by the ozone layer.
So, option B " Helps in checking the penetration of ultraviolet rays to earth" is the correct option.
Question 7
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Dissolved gas present in acid rain is

A
Hydrogen chloride

B
Nitrogen oxide

C
Sulphur dioxide

D
All of the above

Solution

All of the given gases are present in acid rain. Many gases from the industrial effluents and burning of fuels in automobiles led to the release of these harmful gases in the air. These get mixed with rain and form the harmful acid rain.
So, option D is the correct answer.
Question 8
1 / -0

The treated water has a very low level of organic material and suspended matter. It is discharged into __________.

A
sea

B
a river or into the ground

C
both $$A$$ and $$B$$

D
none of the above

Solution

Industrial wastewater treatment describes the processes used for the treatment of wastewater that is produced by industries as an undesirable by-product. After treatment, the treated industrial wastewater (or effluent) may be reused or released to a sanitary sewer or to a surface water in the environment.
Question 9
1 / -0

Tropical cyclones that originate in the China sea are?

A
Hurricanes

B
Typhoons

C
Tornadoes

D
Cyclones

Solution

Tropical cyclone is a non-frontal storm system, usually originates over tropical or subtropical waters and rotates clockwise in the southern hemisphere and counter clockwise in the northern hemisphere. Typhoons are originated in the China sea which can be predicted seven days in advance.
Question 10
1 / -0

The fuel obtained by decomposing sludge is:

A
biogas

B
petrol

C
diesel

D
kerosene

Solution

The gas obtained by decomposing sludge is Biogas (methane and carbon dioxide). Decomposition of sludge products methane and carbon dioxide which is then stored and supplied as biogas for various household processes and other commercial processes.

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Re-Attempt Weekly Quiz Competition

Environmental Chemistry Test - 29

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Environmental Chemistry Test - 29

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SHARING IS CARING

Question 1

They are eco-friendly

The field turn barren after some time

Adversely affect the useful component from the soil.

They destroy soil fertility

Solution

Question 2

Excessive use of automobiles

Excessive industrial units

Excessive use of man made compounds containing chlorine and fluorine

Excessive deforestation

Solution

Question 3

The greenhouse effect would be more efficient and the temperature of earth would increase.

CFCs would result in the depletion of the ozone layer.

Infrared radiation from the sun would bombard earth.

Ultraviolet radiation from the sun cannot enter earth.

Solution

Question 4

Global warming

Ozone hole

Water pollution

Soil erosion

Solution

Question 5

Formation of pyrimidines

Photodynamic action

Breakage of hydrogen bonds in DNA

Protein denaturation

Solution

Question 6

Is advantageous since it supplies O$$_2$$ for people travelling in jets

Helps in checking the penetration of ultraviolet rays to earth

Hinder higher rate of photosynthesis

Has been responsible for increasing the average global temperature in recent years

Solution

Question 7

Hydrogen chloride

Nitrogen oxide

Sulphur dioxide

All of the above

Solution

Question 8

sea

a river or into the ground

both $$A$$ and $$B$$

none of the above

Solution

Question 9

Hurricanes

Typhoons

Tornadoes

Cyclones

Solution

Question 10

biogas

petrol

diesel

kerosene

Solution

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