Environmental Issues Test

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Environmental Issues Test - 62

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Weekly Quiz Competition

Question 1
1 / -0

A higher biochemical oxygen demand in a particular segment of a river indicates that

A
The segment is free from pollution

B
The segment is highly polluted

C
Aquatic life has started flourishing

D
The river has high number of aquatic animals

Solution

Biochemical oxygen demand or BOD is the oxygen required microbial decomposition of a unit mass of organic remains. The degree of impurity of water due to organic matter is measured in terms of BOD. A higher BOD of a river indicates that water is highly polluted.
Question 2
1 / -0

If a water body have high amount of DDT it's 'Biochemical Oxygen Demand' (B.O.D.) will

A
Decrease

B
Not affected

C
Increase

D
First decrease than increase

Solution

Biological Oxygen Demand (BOD) is one of the most common measures of pollutant organic material in water. BOD indicates the amount of putrescible organic matter present in water. Therefore, a low BOD is an indicator of good quality water, while a high BOD indicates polluted water. When BOD levels are high, dissolved oxygen (DO) levels decrease because the oxygen that is available in the water is being consumed by the bacteria. Since less dissolved oxygen is available in the water, fish and other aquatic organisms may not survive.

So, the correct option is 'Increase'.
Question 3
1 / -0

Catalytic converters, which are fitted into automobiles for reducing the emission of poisonous gases possess which of the following metals as catalyst ?

A
Platinum-Palladium

B
Rhodium

C
Lead

D
Both (a) and (b)
Solution
Catalytic converters have costly metals like platinum-palladium and rhodium as catalysts.
Exhaust gases first pass through catalytic converters and get filtered.
So, The correct answer is (D).
Question 4
1 / -0

Motor vehicles equipped with catalytic converter are advised to use unleaded petrol because

A
Lead is a heavy metal

B
Lead causes inactivation of catalyst present in catalytic converter

C
Lead decreases the efficiency of vehicle

D
Lead increases burning of petrol

Solution

Automobiles fitted with catalytic converter should not use leaded petrol because lead inactivates the catalyst of the converter.
Question 5
1 / -0

BOD is ___________ in polluted water and ________in potable water.

A
more, less

B
less, more

C
less in both

D
medium in both

Solution

A low BOD is an indicator of good quality of water. Whereas a high BOD indicates polluted water as in that water the dissolved oxygen is consumed by bacteria.
So, the correct option is 'more, less'
Question 6
1 / -0

A lake with an inflow of domestic sewage rich in organic waste may result in

A
Drying of the lake vary soon due to algal bloom

B
An increased growth of fishes due to lot of nutrients

C
Death of fish due to lack of oxygen

D
Increased population of aquatic food web organisms
Solution
Correct Option: C
Explanation:
- A lake with an inflow of domestic sewage rich in organic waste may contribute to eutrophication.
- This can induce growth of algal blooms and other aquatic plants.
- The algal blooms will take up most of the oxygen leaving behind fishes with very less or no oxygen.
Hence, a lake with an inflow of domestic sewage rich in organic waste may result in death of fish due to lack of oxygen.
Question 7
1 / -0

Study the following ststements regarding organic farming and select the correct ones.
(i) It utilities genetically modified crops like Bt cotton.
(ii) It uses only naturally produced inputs like compost and biofertilisers.
(iii) It does not use pesticides and urea.
(iv) It produces vegetables rich in vitamins and minerals.

A
(i) and (ii)

B
(iii) and (iv)

C
(ii) and (iii)

D
(ii), (iii) and (iv)

Solution

In organic farming, farmers use manures, bio fertilisers, biopesticides and biocontrol agents to increase the crop production instead of using artificial fertilisers and pesticides. It does not utilise genetic engineering.
Question 8
1 / -0

BOD of wastewater is amount of

A
total organic matter

B
biodegradable organic matter

C
oxygen evolution

D
oxygen consumption

Solution

biological oxygen demand is the amount of Oxygen required by aerobic micro-organisms for the breakdown of organic matter present in waste water or polluted water.
So, the correct answer is 'oxygen consumption'
Question 9
1 / -0

The amount of biodegradable organic matter in sewage water can be estimated by measuring

A
Biochemical Oxygen Demand (BOD)

B
The growth of anaerobic bacteria in water

C
Biogeological oxygen demand

D
The growth of aerobic bacteria in water

Solution

Biochemical oxygen demand is the measure of oxygen required by aerobic decomposers for biochemical degradation of the organic materials. BOD indicates the degree of organic pollutants present in water.
Question 10
1 / -0

Given pie-diagram represents the relative contribution of various $$ { GHG }_{ s } $$ to total global warming. Select the correct statements(s) regarding A, B and C.

A
A is the gas which is produced during the combustion of fossil fuels.

B
B are the chemicals which are used as coolants in refrigerators.

C
C is the gas which is the major constituent of biogas.

D
All of these

Solution

In the given pie diagram, relative contribution of various greenhouse gases are shown. 'A' is the $$ { CO }_{ 2 } $$ which is produced due to deforestation and large scale combustion of fossil fuels. 'B' is the $$ { CH }_{ 4 } $$ which is produced by incomplete biomass combustion and is the major constituent of biogas. 'C' are the chlorofluorocarbons $$ { CFC }_{ s } $$ which are used as coolants in air conditioners and refrigerators.
So, the correct answer is 'A is the gas which is produced during the combustion of fossil fuels'.

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Re-Attempt Weekly Quiz Competition

Environmental Issues Test - 62

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Environmental Issues Test - 62

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SHARING IS CARING

Question 1

The segment is free from pollution

The segment is highly polluted

Aquatic life has started flourishing

The river has high number of aquatic animals

Solution

Question 2

Decrease

Not affected

Increase

First decrease than increase

Solution

Question 3

Platinum-Palladium

Rhodium

Lead

Both (a) and (b)

Solution

Question 4

Lead is a heavy metal

Lead causes inactivation of catalyst present in catalytic converter

Lead decreases the efficiency of vehicle

Lead increases burning of petrol

Solution

Question 5

more, less

less, more

less in both

medium in both

Solution

Question 6

Drying of the lake vary soon due to algal bloom

An increased growth of fishes due to lot of nutrients

Death of fish due to lack of oxygen

Increased population of aquatic food web organisms

Solution

Question 7

(i) and (ii)

(iii) and (iv)

(ii) and (iii)

(ii), (iii) and (iv)

Solution

Question 8

total organic matter

biodegradable organic matter

oxygen evolution

oxygen consumption

Solution

Question 9

Biochemical Oxygen Demand (BOD)

The growth of anaerobic bacteria in water

Biogeological oxygen demand

The growth of aerobic bacteria in water

Solution

Question 10

A is the gas which is produced during the combustion of fossil fuels.

B are the chemicals which are used as coolants in refrigerators.

C is the gas which is the major constituent of biogas.

All of these

Solution

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