Direction: It consists of two statements, one labelled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): To practice terraced cultivation in hill slopes, it can be admissible to have the vertical face of the terraced boundary run perpendicular to the ground trace of the fault line, if any, in the underlying land.Statement (II): Fault lines are susceptible to slips and should be guarded against in land use.

Both statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I)

Both Statement (I) and Statement (II) individually true and Statement (II) is the correct explanation of Statement (I)

Both statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I)

Statement (I) is true, but Statement (II) is false

Statement (I) is false, but Statement (II) is true

Direction: It consists of two statements, one labelled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): A greenhouse gas is any gas in the atmosphere which absorbs and re-emits heat and thereby keeps the planet's atmosphere warmer than it otherwise would be. Statement (II): In the Earth's atmosphere, water vapour is one of the main greenhouse gases.

Statement (I) is true, but Statement (II) is false

Both Statement (I) and Statement (II) individually true and Statement (II) is the correct explanation of Statement (I)

Both statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I)

Statement (I) is true, but Statement (II) is false

Statement (I) is false, but Statement (II) is true

It is reported that there is an ongoing decrease in the pH value of ocean water because of global warming. It happens due to :

lesser uptake of \(CO_2\) by ocean water

larger uptake of \(CO_2\) by ocean water

lesser uptake of \(CO_2\) by ocean water

larger uptake of atmospheric nitrogen by ocean water

lesser uptake of atmospheric nitrogen by ocean water

Given below are two statements:Statement I: Emissions of hydrocarbons and carbon monoxide are inherently very low from diesel vehicles.Statement II: Diesel driven vehicles are inherently more fuel-efficient compared to petrol-driven vehicles.In the light of the above statements. choose the most appropriate answer from the options given below:

Both Statement I and Statement II are incorrect

Both Statement I and Statement II are correct

Both Statement I and Statement II are incorrect

Statement I is correct but Statement II is incorrect

Statement I is incorrect but Statement II is correct

Direction: It consists of two statements, one labeled as ‘Statement (I)’ and the others as ‘Statement (II)’. Examine these two statements carefully and select the answer using the codes given below:Statement (I): Global warming is the cause of climate change.Statement (II): Ozone depletion will cause global warming.

Statement (I) is false but Statement (II) is true

Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)

Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)

Statement (I) is true but Statement (II) is false

Statement (I) is false but Statement (II) is true

Direction: It consists of two statements, one labelled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): Normally carbon dioxide is not considered an air pollutant. Statement (II): Carbon dioxide is a constituent of atmospheric air.

Both statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I)

Both Statement (I) and Statement (II) individually true and Statement (II) is the correct explanation of Statement (I)

Both statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I)

Statement (I) is true, but Statement (II) is false

Statement (I) is false, but Statement (II) is true

Given below are two statements: One is labeled as Assertion (A) and the other is labeled as Reason (R) : Assertion (A): Along with water vapor, carbon dioxide is largely responsible for the greenhouse effect of the atmosphere. Reasons (R): Carbon dioxide is not an important heat absorber. In the light of the above Statements. choose the most appropriate answer from the options given below :

(A) is not correct but (R) is correct

Both (A) and (R) are correct and (R) is the correct explanation of (A)

Both (A) and (R) are correct but (R) is NOT the correct explanation of (A)

(A) is correct but (R) is not correct

(A) is not correct but (R) is correct

Ozone layer present in the atmosphere protects life on earth by not permitting harmful radiations present in the sunlight to penetrate through it. Ozone layer is formed by the reaction of

Chlorine nitrate (CINO3) on oxygen (O2)

Chlorofluorocarbons (CFCs) on oxygen (O2)

Solar Ultraviolet rays on oxygen (O2)

Chlorine nitrate (CINO3) on oxygen (O2)

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason RAssertion A: Hydrofluorocarbons (HFCs) need to be phased out to protect the Ozone layer Reason R: HFCs have a high global warming potentialIn light of the above statements, choose the most appropriate answer from the options given below

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is NOT the correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

Given below are two statementsStatement I: Volatile Organic Chemical (VOCs) are contaminated more commonly found in groundwater than in surface waterStatement II: VOCs are one of the criterion parameters to determine drinking water qualityIn light of the above statement, chosen the correct answer from the option given below

Both statement I and statement II are false

Both statement I and statement II are true

Both statement I and statement II are false

Statement I is correct but statement II is false

Statement I is incorrect but statement II is true

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason RAssertion A: Global emissions of carbon dioxide stagnated during the years 2014 - 2016Reason R: Strong energy efficiency improvement measures and low carbon technologies were deployed during 2014 - 2016In light of the above statements, choose the most appropriate answer from the options given below

Both A and R are correct but R is NOT the correct explanation of A

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is NOT the correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

Below are given two sets. Set – I mention the types of pollution, while Set – II indicates their source. Match the two sets and select your answer from the code. Set – I (Pollution Type) Set – II(Source)(a) Air(i)Point and non – point source such as discharges from industries etc.(b)Land (ii) Industries thermal power plants and motor vehicles emissions.(c)Water (iii) Roadway, aircraft, industrial as well as high-intensity sonar.(d)Noise(iv) Overuse of chemical fertilizers.

(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

(a) - (iii), (b) - (i), (c) - (ii), (d) - (iv)

(a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)

(a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)

(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

Given below are two statements:Statement I: The consumption of oxygen has increased after the Industrial Revolution in 1860.Statement II: Brazil and India use more oxygen annually than other countries of the world.In the light of the above statements, choose the correct answer from the options given below:

Statement I is incorrect but Statement II is true

Both Statement I and Statement II are true

Both Statement I and Statement II are false

Statement I is correct but Statement II is false

Statement I is incorrect but Statement II is true

Identify the correct group of diseases caused by polluted water:

Cholera, Typhoid, Enteritis and Tuberculosis

Cholera, Acute Diarrhoea, Typhoid and Polio

Cholera, Typhoid, Enteritis and Tuberculosis

Typhoid, Enteritis and Tuberculosis

Cholera, Acute Diarrhoea, Typhoid and Tuberculosis

Fly ash is produced in a factory during :

manufacturing chemical fertilizers

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason RAssertion A: Polluted rivers with very high values of Biological Oxygen Demand (BOD) may produce a foul smellReason R: Anaerobic bacteria produce sulfur dioxide and oxides of nitrogenIn light of the above statements, choose the most appropriate answer from the options given below

A is correct but R is not correct

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is NOT the correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

99 + Mcqs in Environmental Issues in UGC-NET Page 2 McqOptions

51.	Direction: It consists of two statements, one labelled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): To practice terraced cultivation in hill slopes, it can be admissible to have the vertical face of the terraced boundary run perpendicular to the ground trace of the fault line, if any, in the underlying land.Statement (II): Fault lines are susceptible to slips and should be guarded against in land use.
A.	Both Statement (I) and Statement (II) individually true and Statement (II) is the correct explanation of Statement (I)
B.	Both statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I)
C.	Statement (I) is true, but Statement (II) is false
D.	Statement (I) is false, but Statement (II) is true
Answer» B. Both statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I)

Discussion

52.	Loud noises that continue for a prolonged period can cause
A.	High blood pressure
B.	Ear drum damage
C.	Nervous break down
D.	All of the above
Answer» E.

Discussion

53.	Direction: It consists of two statements, one labelled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): A greenhouse gas is any gas in the atmosphere which absorbs and re-emits heat and thereby keeps the planet's atmosphere warmer than it otherwise would be. Statement (II): In the Earth's atmosphere, water vapour is one of the main greenhouse gases.
A.	Both Statement (I) and Statement (II) individually true and Statement (II) is the correct explanation of Statement (I)
B.	Both statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I)
C.	Statement (I) is true, but Statement (II) is false
D.	Statement (I) is false, but Statement (II) is true
Answer» C. Statement (I) is true, but Statement (II) is false

Discussion

54.	Identify the correct sequence of continents in decreasing order of their yearly carbon dioxide emissions, at presentA. AfricaB. AsiaC. EuropeD. North AmericaChoose the correct answer from the option given below
A.	B, D, A, C
B.	B, D, C, A
C.	D, B, C, A
D.	D, C, B, A
Answer» C. D, B, C, A

Discussion

55.	It is reported that there is an ongoing decrease in the pH value of ocean water because of global warming. It happens due to :
A.	larger uptake of \(CO_2\) by ocean water
B.	lesser uptake of \(CO_2\) by ocean water
C.	larger uptake of atmospheric nitrogen by ocean water
D.	lesser uptake of atmospheric nitrogen by ocean water
Answer» B. lesser uptake of \(CO_2\) by ocean water

Discussion

56.	Match the following Pollutants and their Mediums as per the UNEP documents : PollutantMediuma. Nitrogen oxidesI. Seab. Petroleum hydrocarbonsII. Foodc. FluoridesIII. Aird. MycotoxinsIV. Freshwater
A.	a - I, b - II, c - III, d - IV
B.	a - IV, b - III, c - II, d - I
C.	a - III, b - I, c - IV, d - II
D.	a - II, b - I, c - II, d - IV
Answer» D. a - II, b - I, c - II, d - IV

Discussion

57.	Identify the correct sequence of Carbon (C) to Nitrogen (N) ratio in decreasing order in organic waste materialA. Food wasteB. Leaves and foliageC, PaperD. Cow manureChoose the correct answer from the options given below
A.	C, B, D, A
B.	C, A, D, B
C.	B, C, D, A
D.	B, D, C, A
Answer» B. C, A, D, B

Discussion

58.	Plant based pesticides :a) Parathionb) Aldrinc) Neem oil d) Nicotene
A.	and b)
B.	and c)
C.	and a)
D.	and d)
Answer» E.

Discussion

59.	Noise pollution is measured in decibels (dB) with reference to a standard sound intensity of the following magnitude
A.	1 pico watt per m2
B.	1 milliwatt per m2
C.	1 nanowatt per m2
D.	1 microwatt per m2
Answer» B. 1 milliwatt per m2

Discussion

60.	In residential area, Indian natural ambient air quality standard for sulpher dioxide (SO2) (24 hourly basis) is
A.	20 μ gm/3
B.	55 μ gm/3
C.	60 μ gm/3
D.	80 μ gm/3
Answer» E.

Discussion

61.	Dissolved oxygen (DO), an important parameter of water qualify, is essential for survival of
A.	Humans
B.	Animals
C.	Fish
D.	Crops and vegetables
Answer» D. Crops and vegetables

Discussion

62.	In large parts of Eastern India, the groundwater is contaminated by:
A.	Arsenic
B.	Lead
C.	Mercury
D.	Nickel
Answer» B. Lead

Discussion

63.	Given below are two statements:Statement I: Emissions of hydrocarbons and carbon monoxide are inherently very low from diesel vehicles.Statement II: Diesel driven vehicles are inherently more fuel-efficient compared to petrol-driven vehicles.In the light of the above statements. choose the most appropriate answer from the options given below:
A.	Both Statement I and Statement II are correct
B.	Both Statement I and Statement II are incorrect
C.	Statement I is correct but Statement II is incorrect
D.	Statement I is incorrect but Statement II is correct
Answer» B. Both Statement I and Statement II are incorrect

Discussion

64.	Direction: It consists of two statements, one labeled as ‘Statement (I)’ and the others as ‘Statement (II)’. Examine these two statements carefully and select the answer using the codes given below:Statement (I): Global warming is the cause of climate change.Statement (II): Ozone depletion will cause global warming.
A.	Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
B.	Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
C.	Statement (I) is true but Statement (II) is false
D.	Statement (I) is false but Statement (II) is true
Answer» D. Statement (I) is false but Statement (II) is true

Discussion

65.	Ozone layer in the stratosphere is affected by the increase in the atmospheric concentration of :
A.	CO2
B.	NH3
C.	SO2
D.	CFC
Answer» E.

Discussion

66.	Direction: It consists of two statements, one labelled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): Normally carbon dioxide is not considered an air pollutant. Statement (II): Carbon dioxide is a constituent of atmospheric air.
A.	Both Statement (I) and Statement (II) individually true and Statement (II) is the correct explanation of Statement (I)
B.	Both statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I)
C.	Statement (I) is true, but Statement (II) is false
D.	Statement (I) is false, but Statement (II) is true
Answer» B. Both statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I)

Discussion

67.	Match the following.List– I(Colour codes)List – II(Methods for Disposals)1) Yellow plastic bagsi) Disposal in secured landfills2) Black plastic bagsii) Incineration and deep burials3) Blue/white plastic bagsiii) Autoclaving and chemical treatment4) Red plastic bagsiv) Microwave treatments and destruction
A.	4 - i, 3 - ii, 2 - iii, 1 - iv
B.	1 - i, 4 - ii, 3 - iii, 2 - iv
C.	2 - i, 1 - ii, 4 - iii, 3 - iv
D.	3 - i, 2 - ii, 1 - iii, 4 - iv
Answer» D. 3 - i, 2 - ii, 1 - iii, 4 - iv

Discussion

68.	Day time noise standard prescribed for residential areas in India is
A.	75 dB
B.	65 dB
C.	55 dB
D.	50 dB
Answer» D. 50 dB

Discussion

69.	Pesticide fertilizer causes which pollution?
A.	Air pollution
B.	Water pollution
C.	Soil pollution
D.	Oil pollution
Answer» D. Oil pollution

Discussion

70.	Identify the correct sequence of sectoral global CO2 emission in increasing order as per IPCC (2014) reportA. Electricity and heat productionB. BuildingsC. TransportationD. IndustryChoose the correct answer from the options given below
A.	B, C, D, A
B.	B, C, A, D
C.	B, D, C, A
D.	B, D, A, C
Answer» B. B, C, A, D

Discussion

71.	Given below are two statements: One is labeled as Assertion (A) and the other is labeled as Reason (R) : Assertion (A): Along with water vapor, carbon dioxide is largely responsible for the greenhouse effect of the atmosphere. Reasons (R): Carbon dioxide is not an important heat absorber. In the light of the above Statements. choose the most appropriate answer from the options given below :
A.	Both (A) and (R) are correct and (R) is the correct explanation of (A)
B.	Both (A) and (R) are correct but (R) is NOT the correct explanation of (A)
C.	(A) is correct but (R) is not correct
D.	(A) is not correct but (R) is correct
Answer» D. (A) is not correct but (R) is correct

Discussion

72.	Ozone is scientifically represented as
A.	O
B.	O2
C.	O3
D.	O4
Answer» D. O4

Discussion

73.	Identify the correct sequence of countries contributing to global CO2 emission in decreasing order from fossil fuel burning, cement manufacturing, and gas flaring in the year 2014A. USAB. EU - 28C. ChinaD. RussiaChoose the correct answer from the options given below:
A.	C, A, B, D
B.	A, C, B, S
C.	A, B, C, D
D.	A, C, D, B
Answer» B. A, C, B, S

Discussion

74.	Noise levels at a traffic site are recorded for one hour at a sampling interval of 1 second and percentile indices of noise L1, L10, L50, L90 are computed from the data. The indices are then arranged in increasing order in terms of their values starting from minimum to maximum. which of the following options represents their correct order?
A.	L1, L10, L50, L90
B.	L10, L50, L90, L1
C.	L50, L90, L10, L1
D.	L90, L50, L10, L1
Answer» E.

Discussion

75.	Consider the following statements concerning environmental pollution:1. Nuclear explosions cause radioactive radiation2. Earthquakes do not cause Tsunamis3. Acid rain is not a major environmental issue4. Air pollution has some impact on meteorologyWhich of the above statements are correct?
A.	1 and 2
B.	2 and 3
C.	3 and 4
D.	1 and 4
Answer» E.

Discussion

76.	Noise pollution is created if sound is in excess to
A.	70-75 dB
B.	50-60 dB
C.	80-99 dB
D.	40-65 dB
Answer» D. 40-65 dB

Discussion

77.	Ozone layer present in the atmosphere protects life on earth by not permitting harmful radiations present in the sunlight to penetrate through it. Ozone layer is formed by the reaction of
A.	Chlorofluorocarbons (CFCs) on oxygen (O2)
B.	Chlorine (Cl) on oxygen (O2)
C.	Solar Ultraviolet rays on oxygen (O2)
D.	Chlorine nitrate (CINO3) on oxygen (O2)
Answer» D. Chlorine nitrate (CINO3) on oxygen (O2)

Discussion

78.	Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason RAssertion A: Hydrofluorocarbons (HFCs) need to be phased out to protect the Ozone layer Reason R: HFCs have a high global warming potentialIn light of the above statements, choose the most appropriate answer from the options given below
A.	Both A and R are correct and R is the correct explanation of A
B.	Both A and R are correct but R is NOT the correct explanation of A
C.	A is correct but R is not correct
D.	A is not correct but R is correct
Answer» E.

Discussion

79.	_______ water is bacteriologically & chemically pure
A.	Potable water
B.	Wholesome water
C.	Distilled water
D.	Safe water
Answer» D. Safe water

Discussion

80.	A major cause of water-borne diseases in India is :
A.	hardness of water
B.	scarcity of water
C.	pollution of water
D.	saline water
Answer» D. saline water

Discussion

81.	CFCs are chemically very stable because they contain no
A.	H
B.	Br
C.	CI
D.	All of these
Answer» B. Br

Discussion

82.	In which layer of the earth’s atmosphere is the ozone layer found?
A.	Troposphere
B.	Mesosphere
C.	Exosphere
D.	Stratosphere
Answer» E.

Discussion

83.	Major gaseous pollutant produced by the combustion of coal in power plant is
A.	CO2
B.	CO
C.	SO2
D.	NO2
Answer» D. NO2

Discussion

84.	Given below are two statementsStatement I: Volatile Organic Chemical (VOCs) are contaminated more commonly found in groundwater than in surface waterStatement II: VOCs are one of the criterion parameters to determine drinking water qualityIn light of the above statement, chosen the correct answer from the option given below
A.	Both statement I and statement II are true
B.	Both statement I and statement II are false
C.	Statement I is correct but statement II is false
D.	Statement I is incorrect but statement II is true
Answer» B. Both statement I and statement II are false

Discussion

85.	Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason RAssertion A: Global emissions of carbon dioxide stagnated during the years 2014 - 2016Reason R: Strong energy efficiency improvement measures and low carbon technologies were deployed during 2014 - 2016In light of the above statements, choose the most appropriate answer from the options given below
A.	Both A and R are correct and R is the correct explanation of A
B.	Both A and R are correct but R is NOT the correct explanation of A
C.	A is correct but R is not correct
D.	A is not correct but R is correct
Answer» B. Both A and R are correct but R is NOT the correct explanation of A

Discussion

86.	Below are given two sets. Set – I mention the types of pollution, while Set – II indicates their source. Match the two sets and select your answer from the code. Set – I (Pollution Type) Set – II(Source)(a) Air(i)Point and non – point source such as discharges from industries etc.(b)Land (ii) Industries thermal power plants and motor vehicles emissions.(c)Water (iii) Roadway, aircraft, industrial as well as high-intensity sonar.(d)Noise(iv) Overuse of chemical fertilizers.
A.	(a) - (iii), (b) - (i), (c) - (ii), (d) - (iv)
B.	(a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)
C.	(a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)
D.	(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
Answer» D. (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

Discussion

87.	Given below are two statements:Statement I: The consumption of oxygen has increased after the Industrial Revolution in 1860.Statement II: Brazil and India use more oxygen annually than other countries of the world.In the light of the above statements, choose the correct answer from the options given below:
A.	Both Statement I and Statement II are true
B.	Both Statement I and Statement II are false
C.	Statement I is correct but Statement II is false
D.	Statement I is incorrect but Statement II is true
Answer» D. Statement I is incorrect but Statement II is true

Discussion

88.	Considering the global warming potential of CO2 as one, the global warming potential of CH4 has been estimated to be approximately :
A.	12
B.	15
C.	21
D.	35
Answer» D. 35

Discussion

89.	According to a report released by Greenpeace in Aug, 2019, India is the highest emitter of which of the following pollutants (gases)?
A.	Carbon Monoxide
B.	Sulphur dioxide
C.	Ammonia
D.	Nitrogen dioxide
Answer» C. Ammonia

Discussion

90.	Identify the correct group of diseases caused by polluted water:
A.	Cholera, Acute Diarrhoea, Typhoid and Polio
B.	Cholera, Typhoid, Enteritis and Tuberculosis
C.	Typhoid, Enteritis and Tuberculosis
D.	Cholera, Acute Diarrhoea, Typhoid and Tuberculosis
Answer» B. Cholera, Typhoid, Enteritis and Tuberculosis

Discussion

91.	.............................. is mainly responsible for depletion of ozone in the stratosphere.
A.	Chlorofluorocarbon
B.	Chlorine
C.	Sulfur dioxide
D.	Carbon dioxide
Answer» B. Chlorine

Discussion

92.	If the intensity of a given noise increases two-fold, the noise level in decibels (dB) increases by
A.	~2 dB
B.	~3 dB
C.	~6 dB
D.	~ 10 dB
Answer» C. ~6 dB

Discussion

93.	CO2, CFCs and Chlorine belong to a category of chemicals known as greenhouse gases. Excess presence of these gases in the atmosphere leads to
A.	global warming
B.	protecting the ozone layer
C.	heavy rains
D.	loss of soil fertility
Answer» B. protecting the ozone layer

Discussion

94.	Fly ash is produced in a factory during :
A.	manufacturing chemical fertilizers
B.	refining of bauxite
C.	smelting steel
D.	production of thermal power
Answer» E.

Discussion

95.	Identify the correct statements from the following:(a) CFCs are responsible for the depletion of the Ozone layer.(b) Water vapor, methane, CO2 CFCs., nitrous oxide are greenhouse gases.(c) The BOD value of pure water is 100 ppm.
A.	(a), (b)
B.	(a), (c)
C.	(a), (b), (c)
D.	(b), (c)
Answer» B. (a), (c)

Discussion

96.	Noise levels are measured in decibels. What is the decibel of normal talk?
A.	30
B.	60
C.	90
D.	120
Answer» C. 90

Discussion

97.	Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason RAssertion A: Polluted rivers with very high values of Biological Oxygen Demand (BOD) may produce a foul smellReason R: Anaerobic bacteria produce sulfur dioxide and oxides of nitrogenIn light of the above statements, choose the most appropriate answer from the options given below
A.	Both A and R are correct and R is the correct explanation of A
B.	Both A and R are correct but R is NOT the correct explanation of A
C.	A is correct but R is not correct
D.	A is not correct but R is correct
Answer» C. A is correct but R is not correct

Discussion

98.	In the formation of Surface Ozone, which of the following do play an important role?(A) Oxides of nitrogen(B) Oxides of sulfur(C) Sunlight(D) Carbon monoxideChoose the correct answer from the code given below:
A.	(A), (B), (C)
B.	(B), (C), (A)
C.	(A), (C), (D)
D.	(A), (B), (D)
Answer» D. (A), (B), (D)

Discussion

99.	During waste water treatment, large objects like plastic bottles, plastics, and cans are removed by:
A.	Bar screen
B.	Filtration
C.	Aeration
D.	Chlorination
Answer» B. Filtration

Discussion

Explore topic-wise MCQs in UGC-NET.

Loud noises that continue for a prolonged period can cause

Identify the correct sequence of continents in decreasing order of their yearly carbon dioxide emissions, at presentA. AfricaB. AsiaC. EuropeD. North AmericaChoose the correct answer from the option given below

It is reported that there is an ongoing decrease in the pH value of ocean water because of global warming. It happens due to :

Match the following Pollutants and their Mediums as per the UNEP documents : PollutantMediuma. Nitrogen oxidesI. Seab. Petroleum hydrocarbonsII. Foodc. FluoridesIII. Aird. MycotoxinsIV. Freshwater

Identify the correct sequence of Carbon (C) to Nitrogen (N) ratio in decreasing order in organic waste materialA. Food wasteB. Leaves and foliageC, PaperD. Cow manureChoose the correct answer from the options given below

Plant based pesticides :a) Parathionb) Aldrinc) Neem oil d) Nicotene

Noise pollution is measured in decibels (dB) with reference to a standard sound intensity of the following magnitude

In residential area, Indian natural ambient air quality standard for sulpher dioxide (SO2) (24 hourly basis) is

Dissolved oxygen (DO), an important parameter of water qualify, is essential for survival of

In large parts of Eastern India, the groundwater is contaminated by:

Ozone layer in the stratosphere is affected by the increase in the atmospheric concentration of :

Day time noise standard prescribed for residential areas in India is

Pesticide fertilizer causes which pollution?

Identify the correct sequence of sectoral global CO2 emission in increasing order as per IPCC (2014) reportA. Electricity and heat productionB. BuildingsC. TransportationD. IndustryChoose the correct answer from the options given below

Ozone is scientifically represented as

Identify the correct sequence of countries contributing to global CO2 emission in decreasing order from fossil fuel burning, cement manufacturing, and gas flaring in the year 2014A. USAB. EU - 28C. ChinaD. RussiaChoose the correct answer from the options given below:

Consider the following statements concerning environmental pollution:1. Nuclear explosions cause radioactive radiation2. Earthquakes do not cause Tsunamis3. Acid rain is not a major environmental issue4. Air pollution has some impact on meteorologyWhich of the above statements are correct?

Noise pollution is created if sound is in excess to

Ozone layer present in the atmosphere protects life on earth by not permitting harmful radiations present in the sunlight to penetrate through it. Ozone layer is formed by the reaction of

_______ water is bacteriologically & chemically pure

A major cause of water-borne diseases in India is :

CFCs are chemically very stable because they contain no

In which layer of the earth’s atmosphere is the ozone layer found?

Major gaseous pollutant produced by the combustion of coal in power plant is

Considering the global warming potential of CO2 as one, the global warming potential of CH4 has been estimated to be approximately :

According to a report released by Greenpeace in Aug, 2019, India is the highest emitter of which of the following pollutants (gases)?

Identify the correct group of diseases caused by polluted water:

.............................. is mainly responsible for depletion of ozone in the stratosphere.

If the intensity of a given noise increases two-fold, the noise level in decibels (dB) increases by

CO2, CFCs and Chlorine belong to a category of chemicals known as greenhouse gases. Excess presence of these gases in the atmosphere leads to

Fly ash is produced in a factory during :

Identify the correct statements from the following:(a) CFCs are responsible for the depletion of the Ozone layer.(b) Water vapor, methane, CO2 CFCs., nitrous oxide are greenhouse gases.(c) The BOD value of pure water is 100 ppm.

Noise levels are measured in decibels. What is the decibel of normal talk?

In the formation of Surface Ozone, which of the following do play an important role?(A) Oxides of nitrogen(B) Oxides of sulfur(C) Sunlight(D) Carbon monoxideChoose the correct answer from the code given below:

During waste water treatment, large objects like plastic bottles, plastics, and cans are removed by: