Chemistry (Part-XVI)

1. The biogas used for cooking is a mixture of which of the following? [S.S.C. Online Graduate Level (T-I) 28.08.2016 (Shift-III) ]

(a) Carbon dioxide & oxygen
(b) Isobutane & propane
(c) Methane & carbon monoxide
(d) Methane & carbon dioxide

Correct Answer: (d) Methane & carbon dioxide

Solution:Biogas is produced by fermentation of biologically fissile organic materials such as sewage waste, domestic waste, organic matter, leaves of green plants, etc., in the absence of oxygen. It is a fuel gas, which is a mixture of about 65% methane (CH₄) and 35% carbon dioxide.

2. Which of the following is least likely to be an effect of global warming? [S.S.C. Online Graduate Level (T-I) 6.09.2016 (Shift-II) ]

(a) Increased frequency of hurricanes
(b) Loss of fertile delta region as for agriculture
(c) Decreased rate of photosynthesis in vegetation
(d) Shrinking of the polar ice regions

Correct Answer: (c) Decreased rate of photosynthesis in vegetation

Solution:Global warming reflects increased carbon dioxide in the atmosphere and this increased carbon dioxide (CO₂) increases the rate of photosynthesis, which also increases the rate of plant growth.

3. Ozone protects biosphere from _____ . [S.S.C. Online Graduate Level (T-I) 9.09.2016 (Shift-III) ]

(a) X-rays
(b) Gamma rays
(c) Ultraviolet rays
(d) Infrared rays

Correct Answer: (c) Ultraviolet rays

Solution:The stratosphere is the part or layer of the atmosphere in which ozone gas is found. This gas absorbs the radiated short wavelength radiations such as ultraviolet rays from the Sun, preventing them from reaching the Earth and thus this gas protects the biosphere from the effects of these harmful rays.

4. The depletion in Ozone layer is caused by ____ . [S.S.C. Online Graduate Level (T-I) 1.09.2016 (Shift-I) ]

(a) Nitrous oxide
(b) Carbon dioxide
(c) Chlorofluorocarbons
(d) Methane

Correct Answer: (c) Chlorofluorocarbons

Solution:The main reason for the depletion of the ozone layer in the atmosphere is the production and emission of chlorofluorocarbon gases. These gases come out from the compressors of the refrigerant houses. The free chlorine atoms released from these gases destroy the ozone (O₃) molecule and cause a decrease in its quantity.

5. The release of which of the following is the main reason for the depletion of the ozone layer? [S.S.C. Online CHSL (T-I) 8.02.2017 (Shift-II) ]

(a) Nitrous oxide
(b) Hydrogen dioxide
(c) Chlorofluorocarbons
(d) Carbon monoxide

Correct Answer: (c) Chlorofluorocarbons

Solution:The main reason for the depletion of the ozone layer in the atmosphere is the production and emission of chlorofluorocarbon gases. These gases come out from the compressors of the refrigerant houses. The free chlorine atoms released from these gases destroy the ozone (O₃) molecule and cause a decrease in its quantity.

6. Ozone hole is caused by chemicals like _____ . [S.S.C. Online CHSL (T-I) 17.01.2017 (Shift-I) ]

(a) Nitrogen Oxide
(b) Hydrogen Sulphide
(c) Chlorofluoro Carbon
(d) Carbon Monoxide

Correct Answer: (c) Chlorofluoro Carbon

Solution:The main reason for the depletion of the ozone layer in the atmosphere is the production and emission of chlorofluorocarbon gases. These gases come out from the compressors of the refrigerant houses. The free chlorine atoms released from these gases destroy the ozone (O₃) molecule and cause a decrease in its quantity.

7. Ozone is represented as _____ . [S.S.C. Online CHSL (T-I) 23.01.2017 (Shift-I) ]

(a) O₃
(b) H₂O₂
(c) Cl₂O
(d) N₂O

Correct Answer: (a) O₃

Solution:This is the chemical formula for ozone. It is an allotrope of oxygen, meaning it's a different structural form of the element oxygen. It consists of three oxygen atoms bonded together.

8. What is the Greenhouse Effect? [S.S.C. Online CHSL (T-I) 19.01.2017 (Shift-I) ]

(a) The fall in population of plants due to human activity.
(b) It is the warming of earth's surface due to its atmosphere.
(c) The polluting effect of burning fossil fuels.
(d) The heating of the atmosphere due to depletion of the ozone layer.

Correct Answer: (b) It is the warming of earth's surface due to its atmosphere.

Solution:The Greenhouse Effect is a natural process that warms the Earth's surface. When the Sun's energy reaches Earth's atmosphere, some of it is reflected back into space, and the rest is absorbed and re-radiated by greenhouse gases.

9. Which of the following is a Green House Gas? [C.P.O. S.I. 11.06.2016 (Shift-I) ]

(a) Methane
(b) Oxygen
(c) carbon monoxide
(d) Sulfur dioxide

Correct Answer: (a) Methane

Solution:Greenhouse gases are responsible for changes in the planet's atmosphere or climate and for global warming. Greenhouse gases responsible for ozone pollution in the troposphere are water vapor (up to 36-72 percent), carbon dioxide (up to 9-26 percent), methane (up to 4-9 percent), ozone (up to 3-7 percent), nitrous oxides and chlorofluorocarbons.

10. Which of the following is not a Green House Gas? [S.S.C. Online Constable GD 18.02.2019 (Shift-III) ]

(a) Carbon dioxide
(b) Argon
(c) Methane
(d) Nitrous oxide

Correct Answer: (b) Argon

Solution:Greenhouse gases are responsible for changes in the planet's atmosphere or climate and for global warming. Greenhouse gases responsible for ozone pollution in the troposphere are water vapor (up to 36-72 percent), carbon dioxide (up to 9-26 percent), methane (up to 4-9 percent), ozone (up to 3-7 percent), nitrous oxides and chlorofluorocarbons.

Chemistry (Part-XVI)

1. The biogas used for cooking is a mixture of which of the following? [S.S.C. Online Graduate Level (T-I) 28.08.2016 (Shift-III) ]

2. Which of the following is least likely to be an effect of global warming? [S.S.C. Online Graduate Level (T-I) 6.09.2016 (Shift-II) ]

3. Ozone protects biosphere from _____ . [S.S.C. Online Graduate Level (T-I) 9.09.2016 (Shift-III) ]

4. The depletion in Ozone layer is caused by ____ . [S.S.C. Online Graduate Level (T-I) 1.09.2016 (Shift-I) ]

5. The release of which of the following is the main reason for the depletion of the ozone layer? [S.S.C. Online CHSL (T-I) 8.02.2017 (Shift-II) ]

6. Ozone hole is caused by chemicals like _____ . [S.S.C. Online CHSL (T-I) 17.01.2017 (Shift-I) ]

7. Ozone is represented as _____ . [S.S.C. Online CHSL (T-I) 23.01.2017 (Shift-I) ]

8. What is the Greenhouse Effect? [S.S.C. Online CHSL (T-I) 19.01.2017 (Shift-I) ]

9. Which of the following is a Green House Gas? [C.P.O. S.I. 11.06.2016 (Shift-I) ]

10. Which of the following is not a Green House Gas? [S.S.C. Online Constable GD 18.02.2019 (Shift-III) ]

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