It is necessary to remove sulphur from petroleum products to
1. | reduce the emission of sulphur dioxide in exhaust fumes |
2. | increase efficiency of automobiles' engines |
3. | use sulphur removed from petroleum for commercial purposes |
4. | increase the life span of engine silencers |
Algal blooms impart a distinct colour to water due to:
1. | Their pigments |
2. | Excretion of coloured substances |
3. | Formation of coloured chemicals in water facilitated by physiological degradation of algae |
4. | Absorption of light by algal cell wall |
In the textbook you came across “Three Mile Island and Chernobyl disasters associated with accidental leakage of radioactive wastes.” In India, we had Bhopal gas tragedy. It is associated with which of the following?
1. | CO2 | 2. | Methyl Isocyanate |
3. | CFC | 4. | Methyl Cyanate |
Assertion (A): | According to CPCB, particulate size 2.5 micrometer or less in diameter [PM 2.5] are responsible for causing the greatest harm to human health. |
Reason (R): | These fine particles can be inhaled deep into the lungs and can damage lungs. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Compressed natural gas poses less of a threat in the event of a spill. |
Reason (R): | It is heavier than air and sediments to the surface quickly. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Cultural eutrophication leads to decreased biodiversity in an aquatic ecosystem. |
Reason (R): | The primary limiting factor for eutrophication is phosphate. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Predatory fish such as swordfish and sharks or birds like osprey and eagles have higher concentrations of mercury in their tissue than what could be accounted for by direct exposure alone. |
Reason (R): | Mercury [or methyl mercury] undergoes biomagnifications in aquatic food chains. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Greenhouse effect is harmful to life on earth. |
Reason (R): | It leads to increased risk in human beings for the development of certain cancers. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Most of the longer-wavelength UV-C radiation reaches the surface of the earth. |
Reason (R): | Ozone is transparent to most UV-C. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Ozone hole over Antarctica develops each year between late August and early October. |
Reason (R): | Ozone depletion occurs within the polar vortex. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |