Q. No.| Statement I: | The nutrient deficient water bodies lead to eutrophication. |
| Statement II: | Eutrophication leads to decrease in the level of oxygen in the water bodies. |
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.
| 1. | Photochemical smog is harmful to humans but has no effect on plants. |
| 2. | Plants like Pinus, Juniparus can help in reducing the photochemical smog. |
| 3. | Photochemical smog occurs in warm, dry, and sunny climates. |
| 4. | Common components of photochemical smog are ozone, nitric oxide, acrolein, formaldehyde, and peroxyacetyl nitrate. |
a. particulate matter
b. ozone
c. hydrocarbons
d. hydrogen peroxide
Choose the most appropriate answer from the options given below:
1. a, c, d only
2. a, d only
3. a , b, d only
4. b, c, d only
A student collected samples from two water bodies A and B in a metro city. The biochemical oxygen demand for 'A' is 3 ppm while for B is found to be 18 ppm. Which one of the following is true?
1. Both A and B are clean
2. Both A and B are polluted
3. A is clean but B is polluted
4. A is polluted but B is clean
| List-I | List-II |
| (a) Biochemical oxygen demand | (i) Oxidising mixture |
| (b) Photochemical smog | (ii) Polar stratospheric cloud |
| (c) Classical smog | (iii) Organic matter in water |
| (d) Ozone layer depletion | (iv) Reducing mixture |
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (iv) | (ii) | (iii) |
| 2. | (iii) | (iv) | (i) | (ii) |
| 3. | (iii) | (i) | (iv) | (ii) |
| 4. | (iv) | (iii) | (ii) | (i) |
Match List-1 with List-II
| List-I | List-II |
| (a). | (i). Acid rain |
(b).  |
(ii). Smog |
| (c). |
(iii). Ozone depletion |
| (d). | (iv). Tropospheric pollution |
Choose the correct answer from the options given below:
| (a). | (b). | (c). | (d). | |
| 1. | (iv). | (iii). | (i). | (ii). |
| 2. | (iii). | (ii). | (iv). | (i). |
| 3. | (i). | (ii). | (iii). | (iv). |
| 4. | (ii). | (iii). | (iv). | (i). |
The incorrect statement about carbon monoxide is-
| 1. | It reduces the oxygen-carrying ability of blood. |
| 2. | The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin. |
| 3. | It is produced due to incomplete combustion. |
| 4. | It forms carboxyhaemoglobin. |
Which of the following statement is NOT true about acid rain?
| 1. | It is due to the reaction of SO2, NO2, and CO2 with rainwater |
| 2. | Causes no damage to monuments like the Taj Mahal. |
| 3. | It is harmful to plants. |
| 4. | Its pH is less than 5.6 |
Among the following, the one that is not a greenhouse gas is:
1. Sulphur dioxide
2. Nitrous oxide
3. Methane
4. Ozone
The liquefied gas that is used in dry cleaning along with a suitable detergent is-
1. Water gas
2. Petroleum gas
3. NO2
4. CO2
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