Environmental Issues Test

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Environmental Issues Test - 72

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following damages WBC bone-marrow and lymph nodes?

A
I$$^{131}$$

B
Ca

C
Cesium

D
Strontium

Solution

A. I¹³¹ is radioactive iodine which gets incorporated in thyroid gland and damages the white blood cells (WBCs), bone marrow, lymph nodes and can cause cancer.
B. Calcium is a important mineral in body. It is a component of bones, acts as cofactor for many enzymes etc.
C. Cesium can displace potassium from the body and also causes epileptic seizures.
D. Strontium enters the bones and causes bone cancer.
So, the correct answer is 'I¹³¹'.
Question 2
1 / -0

These are the green house gases match their exact concentration in the environment.
1 - Methane
2 - CFCs
3 - N$$_2$$O
4 - Carbon dioxide

A
A- 2, B- 4, C- 1, D- 3

B
A- 3, B- 4, C- 1, D- 2

C
A- 1, B- 2, C- 3, D- 4

D
A- 4, B- 2, C- 1, D- 3
Question 3
1 / -0

Which prokaryotic organism is frequently used in laboratories for testing the given phenomenon?

A
Amoeba

B
Paramecium

C
Escherichia coli

D
Agrobacterium tumefaciens

Solution

The biochemical oxygen demand (BOD) test is a crucial environmental index for monitoring organic pollutants in wastewater. Micro-organisms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen, and as a result there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. This causes mortality of fish and other aquatic creatures. The test for biochemical oxygen demand (BOD) is a bioassay procedure that measures the oxygen consumed by E.Coli bacteria from the decomposition of organic matter. The change in dissolved oxygen concentration is measured over a given period of time in water samples at a specified temperature.
Question 4
1 / -0

Contamination of radioactive materials are dangerous because it causes

A
Biological magnification

B
Gene mutation

C
Photochemical smog

D
Ozone distruction

Solution

Radioactive substances are those which have the ability to emit high energy particles like alpha and beta particles and gamma rays. Radioactive substances are unstable in nature and are continuously emitting these particles in order to gain some stability. The radiation can cause irreparable damage to the genetic material and lead to life-threatening condition. Radiation causes genetic mutations that promote the growth of cancerous cells in the body. The effects of genetic mutation tend to pass on to the future generation.
Question 5
1 / -0

Which of the following radioactive element is found in tobacco smoke?

A
lodine-131

B
Polonium-210

C
Caesium-137

D
Strontium-90

Solution

Tobacco smoke contains a radioactive chemical element called as polonium-210. Polonium-210 emits a type of radiation called as alpha-radiation, which is very energetic and can seriously damage DNA.
Question 6
1 / -0

Leukaemia is caused by

A
Ca 40

B
Sr 90

C
Caesium

D
Iodine

Solution

Strontium-90 is chemically similar to calcium, and tends to deposit in bone and blood-forming tissue (bone marrow). Thus, strontium-90 is referred to as a bone seeker. Internal exposure to Sr-90 is linked to bone cancer, cancer of the soft tissue near the bone, and leukaemia. Risk of cancer increases with increased exposure to Sr-90. The risk depends on the concentration of Sr-90 in the environment, and on the exposure conditions.
Question 7
1 / -0

What is being depicted in this graph?

A
Green house gases

B
Mineral rich water

C
BOD

D
Oligotrophic pond

Solution

Figure shows changes that one may notice following discharge of sewage into a river. Micro-organisms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen, and as a result there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. This causes mortality of fish and other aquatic creatures. A - dissolved oxygen and B - BOD.
Therefore, the correct answer is option C.
Question 8
1 / -0

Which of the following is a largest source of formaldehyde vapour pollution in a room?

A
Utensil

B
Furniture

C
Cooking range

D
Books

Solution

In homes, the most significant sources of formaldehyde are likely to be pressed wood products that used adhesives containing urea-formaldehyde (UF) resins. Pressed wood are mainly used for furniture and releases formaldehyde vapour in rooms. Thus, the correct answer is option B.
Question 9
1 / -0

Contribution of methane to global warming is

A
6%

B
14%

C
20%

D
30%

Solution

The poisonous gases released in the environment traps the radiations on the earth and increases temperature which leads to global warming. Methane is a more potent greenhouse gas than $$CO_2$$, there is over 200 times more $$CO_2$$ in the atmosphere. For example $$CO_2$$ levels are 380 ppm (parts per million), while methane levels are 1.75 ppm. Hence, the amount of warming methane contributes is calculated at 20% of the warming $$CO_2$$ contributes.
Question 10
1 / -0

In a survey conducted in Delhi, on the efforts being made to clear the Km patch in Yamuna, it was observed that the BOD in 2003 was 13 mg/litre while it was 18 mg/litre in 2004.
What inference can you draw from the following data?

A
The pollutants in the river has decreased due to efforts by Delhi government.

B
Despite efforts there are still dissolved minerals in the river.

C
Although efforts are being made, the pollution is still on an increase in Delhi.

D
There is an algae in the river.

Solution

Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period. As the level of BOD increases, this shows that efforts are being made to clean Yamuna river but pollution is still on an increase in Delhi.
Therefore, the correct answer is option C.

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Re-Attempt Weekly Quiz Competition

Environmental Issues Test - 72

Result

Environmental Issues Test - 72

Score

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Rank

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SHARING IS CARING

Question 1

I$$^{131}$$

Ca

Cesium

Strontium

Solution

Question 2

A- 2, B- 4, C- 1, D- 3

A- 3, B- 4, C- 1, D- 2

A- 1, B- 2, C- 3, D- 4

A- 4, B- 2, C- 1, D- 3

Question 3

Amoeba

Paramecium

Escherichia coli

Agrobacterium tumefaciens

Solution

Question 4

Biological magnification

Gene mutation

Photochemical smog

Ozone distruction

Solution

Question 5

lodine-131

Polonium-210

Caesium-137

Strontium-90

Solution

Question 6

Ca 40

Sr 90

Caesium

Iodine

Solution

Question 7

Green house gases

Mineral rich water

BOD

Oligotrophic pond

Solution

Question 8

Utensil

Furniture

Cooking range

Books

Solution

Question 9

6%

14%

20%

30%

Solution

Question 10

The pollutants in the river has decreased due to efforts by Delhi government.

Despite efforts there are still dissolved minerals in the river.

Although efforts are being made, the pollution is still on an increase in Delhi.

There is an algae in the river.

Solution

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