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Q. No.Carefully read the sign board in the given picture and select the correct statements regarding the possible solution for a grave environment pollutant:
I:
The polyblend, a fine powder of recycled modified plastic, is mixed with bitumen to lay roads.
II:
Polyblend enhances the bitumen’s water repellent properties and helps to increase the road life by a factor of 3.
1. Both Statement I and Statement II are incorrect
2. Both Statement I and Statement II are correct
3. Only Statement II is correct
4. Only Statement I is correct
Subtopic: Solid Waste Pollution |
89%
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The given diagram shows the schematic representation of reactions in lower stratosphere leading to ozone depletion. Identify the correct matches:
1. All are correctly matched
2. All except D and E are correctly matched
3. Only A, B and C are correctly matched
4. Only D, E and F are correctly matched
| A | UV radiation hits CFC molecule |
| B | Chlorine atom breaks away |
| C | Chlorine atom hits Ozone molecule |
| D | Chlorine atom takes one oxygen molecule and creates chlorine monoxide leaving one atom of oxygen. |
| E | Oxygen molecule hits chlorine monoxide molecule |
| F | Two oxygen atoms form an oxygen molecule and chlorine atom is free. |
2. All except D and E are correctly matched
3. Only A, B and C are correctly matched
4. Only D, E and F are correctly matched
Subtopic: Ozone Layer Depletion |
From NCERT
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Identify the correct statement(s) regarding greenhouse effect:
| I: | The green house effect is a natural phenomenon responsible for heating of earth’s surface and atmosphere. |
| II: | Greenhouse gases absorb short wave UV radiation and emit it again towards the earth. |
| III: | During the past century, the temperature of earth has increased by 60C |
| 1. | Only Statement I |
| 2. | Only Statement III |
| 3. | Only Statement II and Statement III |
| 4. | Only Statement I and Statement II |
Subtopic: Green House Effect & Global Warming |
53%
From NCERT
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below :
| Assertion (A): | Nuclear waste is an extremely potent pollutant and has to be dealt with utmost caution. |
| Reason (R): | Radiation that is given by nuclear waste causes mutations at a very high rate. |
| 1. | Both (A) and (R) are true but (R) does not explain (A). |
| 2. | (A) is true but (R) is false. |
| 3. | (A) is false but (R) is true. |
| 4. | Both (A) and (R) are true and (R) explains (A). |
Subtopic: Agrochemical & Radioactive Waste |
81%
From NCERT
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Consider the given two statements:
1. Both Statement I and Statement II are incorrect
2. Both Statement I and Statement II are correct
3. Only Statement II is correct
4. Only Statement I is correct
| Statement I: | Biomagnification can never occur in terrestrial ecosystems. |
| Statement II: | Inorganic fertilisers and pesticides are not toxic to non-target organisms. |
2. Both Statement I and Statement II are correct
3. Only Statement II is correct
4. Only Statement I is correct
Subtopic: Agrochemical & Radioactive Waste | Water Pollution |
69%
From NCERT
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Identify the correctly matched pairs:
1. Only A and B
2. Only C and D
3. Only B and D
4. A, B, C and D
| A | Desertification | A type of land degradation in drylands in which biological productivity is lost due to natural processes or induced by human activities whereby fertile areas become increasingly arid. |
| B | Soil erosion | A form of soil degradation, it is the denudation of the fertile top layer of the soil. |
| C | Water-logging | It is the saturation of soil with water where the soil is nearly saturated with water much of the time such that its air phase is restricted and anaerobic conditions prevail. |
| D | Soil Salinity | It is the salt content in the soil; the process of increasing the salt content is known as salinization. |
2. Only C and D
3. Only B and D
4. A, B, C and D
Subtopic: Resource Utilisation & Maintenance |
73%
From NCERT
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below :
| Assertion (A): | Irrigation without proper drainage of water has a very detrimental effect on crops. |
| Reason (R): | It draws salt to the surface of the soil which is inimical to the growth of crops. |
| 1. | Both (A) and (R) are true but (R) does not explain (A). |
| 2. | (A) is true but (R) is false. |
| 3. | (A) is false but (R) is true. |
| 4. | Both (A) and (R) are true and (R) explains (A). |
Subtopic: Resource Utilisation & Maintenance |
75%
From NCERT
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Study the given diagram regarding accelerated or cultural eutrophication of a water body:
The correctly matched pairs include:
| 1. | Normally the cause if an excess of nutrients applied to the soil. |
| 2. | Some nutrients leach into the soil and get drained into the water body. |
| 3. | Some nutrients run off over the ground into the body of water. |
| 4. | The excess nutrients cause an algal bloom. |
| 7. | Eventually, the algal bloom dies, sinks to the bottom of the lake, gets decomposed by bacteria which increases the dissolved oxygen in the water body. |
| 8. | Increased dissolved oxygen content is dangerous to larger life forms. |
The correctly matched pairs include:
| 1. | All | 2. | All except 7 and 8 |
| 3. | All except 1, 3, and 4 | 4. | Only 1 and 2 |
Subtopic: Water Pollution |
73%
From NCERT
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The figure shows biomagnifications of DDT in an aquatic food chain. At which stage is the biomagnification largest in magnitude?
| 1. | A to B |  |
| 2. | B to C | |
| 3. | C to D | |
| 4. | D to E |
Subtopic: Water Pollution |
From NCERT
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Consider the two statements:
1. Both Statement I and Statement II are incorrect
2. Both Statement I and Statement II are correct
3. Only Statement II is correct
4. Only Statement I is correct
| I: | At least 1.0% impurities must be present in a sample of domestic sewage to make it unfit for human use. |
| II: | Waste water from industries often contains toxic heavy metals like mercury, cadmium, copper and lead that have a density greater than 5 gm/cm3. |
2. Both Statement I and Statement II are correct
3. Only Statement II is correct
4. Only Statement I is correct
Subtopic: Water Pollution |
61%
From NCERT
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