Environmental Issues Test

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Environmental Issues Test - 60

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Weekly Quiz Competition

Question 1
1 / -0

Match the columns and choose the correct options.
I II
(p) e waste (i) Waste clothing
(q) Biodegradable waste (ii) Dirt
(r) Inert waste (iii) Green waste
(s) Composite waste (iv) Irreparable waste

A
p-i, q-ii, r-iv, s-iii

B
p-iv, q-iii, r-ii, s-i

C
p-iii, q-iv, r-i, s-ii

D
p-iv, q-iii, r-i, s-ii
Solution
- (p)e-waste - (iv)Irreparable waste - Irreparable computers and other electronic goods are known as electronic wastes (e-waste). Electronic waste or e-waste describes discarded electrical or electronic devices. When electronic waste is thrown away in landfills their toxic materials seep into groundwater, affecting both land and sea animals.
- (q)Biodegradable waste - (iii)Green waste -Green waste is an organic waste that can be composted. As green waste can be degraded by natural processes into some usable forms they are called a biodegradable waste.
- (r)Inert waste - (ii)Dirt -Inert waste is waste which is neither chemically nor biologically reactive and will not decompose. Examples of this are sand and concrete. Inert waste is also called as dirt.
- (s)Composite waste -(i)Waste clothing - Composite is a material made of 2 or more materials. Hence the overall properties are dependent on the type of reinforcement and matrix. Once the material has done its part and it no longer used it is needed to be replaced.
- So, the correct answer is 'p-iv, q-iii, r-ii, s-i'
Question 2
1 / -0

Water above the dissolved $$O_2$$ content may be considered uncontaminated.

A
$$0.8$$ mg/l

B
$$0.008$$ mg/l

C
$$8.0$$ mg/l

D
8 $$\mu$$g/l

Solution

The microorganisms in water decompose organic matter using dissolved oxygen. More the amount of dissolved oxygen in the water, more is its purity and vice versa. Water below 5mg/l is considered contamined and water above 8mg/l is considered as uncontaminated.

So, the correct answer is "8.0mg/l".

Question 3

1 / -0

Match and find the correct option.

	I		II		III
(a)	BOD	(i)	Supernatant as effluent	(p)	Useful aerobic microbes
(b)	Flocs	(ii)	Measure of organic matter	(q)	All settled solids
(c)	Primary sludge	(iii)	Masses of bacteria associated with fungi	(r)	Methane hydrogen sulphide carbon dioxide
(d)	Biogas	(iv)	Anaerobic sludge digester	(s)	Polluting water has more BOD

a-ii-s, b-iii-p, c-i-q, d-iv-r

a-ii-p, b-i-r, c-iv-q, d-iii-s

a-i-s, b-iii-q, c-iv-p, d-ii-r

a-iv-r, b-ii-s, c-iii-p, d-i-q

Solution

(a)BOD - (ii)Measure of organic matter-(s)Polluting water has more BOD-Biochemical Oxygen Demand is the amount of dissolved oxygen needed by aerobic microbes to break down organic material present in a given water sample at certain temperature over a specific time period. Polluting water has more organic matter thus required more oxygen for the breakdown. Hence polluting water has more BOD.

(b)Flocs- (iii)Masses of bacteria associated with fungi -(p)Useful aerobic microbes-Flocs are the masses of bacteria associated with fungi. Flocs are helpful in increasing the decomposition rate and are put in the aeration tank while the secondary sewage treatment process is in effect

(c)Primary sludge-(i)Supernatant as effluent-(q)All settled solids-Primary sludge includes settleable solids removed during primary treatment in primary clarifiers.

(d)Biogas-(iv)Anaerobic sludge digester-(r)Methane, hydrogen sulfide, carbon dioxide-Biogas is the mixture of gases(Methane, hydrogen sulfide, carbon dioxide)- produced by the breakdown of organic matter in the absence of oxygen(I.e from anaerobic sludge digesters).

Question 4
1 / -0

Which of the following process does maximum destruction of ozone?

A
OH system

B
N$$_2$$O system

C
CFCl$$_2$$ system

D
CF$$_2$$Cl$$_2$$ system

Solution

The depletion potential is roughly equivalent, nitrous oxide could have a more damaging effect because it is much more abundant. Global human emissions of N2O are roughly 10 million tonnes per year, compared to slightly more than 1 million tonnes from all CFCs at the peak of their emissions. The CFCs and N2O are very stable in the troposphere, where they are emitted and are transported to the stratosphere where they release active chemicals that destroy stratospheric ozone through chlorine- or nitrogen oxide–catalyzed processes.
So the correct answer is 'N$$_2$$O system'.
Question 5
1 / -0

Water (Prevention and Control of Pollution) Act was enacted during

A
$$1952$$

B
$$1972$$

C
$$1974$$

D
$$1969$$

Solution

The Water (Prevention and Control of Pollution) Act was enacted in 1974 to provide for the prevention and control of water pollution, and for the maintaining or restoring of wholesomeness of water in the country. The Act was amended in 1988. The Water (Prevention and Control of Pollution) Cess Act was enacted in 1977, to provide for the levy and collection of a cess on water consumed by persons operating and carrying on certain types of industrial activities. This cess is collected with a view to augment the resources of the Central Board and the State Boards for the prevention and control of water pollution constituted under the Water (Prevention and Control of Pollution) Act, 1974.
So the correct answer is '1974'.
Question 6
1 / -0

Polonium-$$210$$ is pollutant emitted from

A
Laboratory radioisotopes

B
Coolant water of reactors

C
Automobile exhausts

D
Thorium rich sands

Solution

Polonium in its pure form is a low-melting, fairly volatile metal. Polonium-210 has a half-life of 138 days, and it decays to stable lead-206 by emitting an alpha particle. Po-210 results from the natural radioactive decay of uranium, which is commonly found in Sierra Nevada granites. Po-210 emits alpha particles, which makes it decay to form a stable isotope of lead which is radioactive isotope radiation emitted by Po-210.
So the correct answer is 'Laboratory radio-isotopes'.
Question 7
1 / -0

Multiple Choice Questions
Biochemical oxygen demand may not be good index for water bodies receiving effluents from.

A
Sugar industry

B
Domestic sewage

C
Dairy industry

D
Petroleum industry

Solution

Biochemical Oxygen Demand or BOD is the amount of dissolved oxygen in a water body, required by microorganisms for the aerobic breakdown of organic matter in the water. Petroleum waste consists of inorganic constituents that also may cut off the oxygen supply into the water body thus BOD may not be a good index for water receiving effluents containing it.
So, the correct option is 'petroleum industry'.
Question 8
1 / -0

The main reason for global warming is?

A
Gradually increasing temperature of the Sun

B
Gradually increasing temperature in the earth core

C
Increased accumulation of $$CO_2$$ in air

D
Establishment of more industries using exothermic processes
Question 9
1 / -0

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this.

A
Lots of urea of phosphate fertilizer were used in the crops in the vicinity

B
The area was sprayed with DDT by an aircraft

C
The lake water turned green and stinky

D
Phytoplankton populations in the lake declined initially there by greatly reducing photosynthesis
Question 10
1 / -0

Multiple Choice Questions
Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers.

A
Methane

B
Nitrous oxide

C
Ozone

D
Ammonia

Solution

Ozone is a triatomic gas that forms a shield or layer in the stratosphere region of atmosphere. This layer protects the living beings from harmful effects of UV-B rays of 280-320 nm. Depletion of the ozone layer can lead to an increased incidence of skin cancer.
So the correct option is 'ozone'.

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Re-Attempt Weekly Quiz Competition

	I		II
(p)	e waste	(i)	Waste clothing
(q)	Biodegradable waste	(ii)	Dirt
(r)	Inert waste	(iii)	Green waste
(s)	Composite waste	(iv)	Irreparable waste

Environmental Issues Test - 60

Result

Environmental Issues Test - 60

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Rank

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SHARING IS CARING

Question 1

p-i, q-ii, r-iv, s-iii

p-iv, q-iii, r-ii, s-i

p-iii, q-iv, r-i, s-ii

p-iv, q-iii, r-i, s-ii

Solution

Question 2

$$0.8$$ mg/l

$$0.008$$ mg/l

$$8.0$$ mg/l

8 $$\mu$$g/l

Solution

Question 3

a-ii-s, b-iii-p, c-i-q, d-iv-r

a-ii-p, b-i-r, c-iv-q, d-iii-s

a-i-s, b-iii-q, c-iv-p, d-ii-r

a-iv-r, b-ii-s, c-iii-p, d-i-q

Solution

Question 4

OH system

N$$_2$$O system

CFCl$$_2$$ system

CF$$_2$$Cl$$_2$$ system

Solution

Question 5

$$1952$$

$$1972$$

$$1974$$

$$1969$$

Solution

Question 6

Laboratory radioisotopes

Coolant water of reactors

Automobile exhausts

Thorium rich sands

Solution

Question 7

Sugar industry

Domestic sewage

Dairy industry

Petroleum industry

Solution

Question 8

Gradually increasing temperature of the Sun

Gradually increasing temperature in the earth core

Increased accumulation of $$CO_2$$ in air

Establishment of more industries using exothermic processes

Question 9

Lots of urea of phosphate fertilizer were used in the crops in the vicinity

The area was sprayed with DDT by an aircraft

The lake water turned green and stinky

Phytoplankton populations in the lake declined initially there by greatly reducing photosynthesis

Question 10

Methane

Nitrous oxide

Ozone

Ammonia

Solution

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