Science & Biotechnology

11. Name the International treaty designed to protect the ozone layer from CFCs. [S.S.C. Online CHSL (T-I) 24.01.2017 (Shift-II)]

(a) Ozone Protocol
(b) Montreal Protocol
(c) Green Protocol
(d) UV Protocol

Correct Answer: (b) Montreal Protocol

Solution:The international treaty designed to protect the ozone layer from CFCs is the "Montreal Protocol." This treaty came into effect on January 1, 1989. India signed this treaty on June 19, 1992.

12. 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.

13. Which of the following is least likely to be an effect of global warming? [S.S.C. Online Graduate Level (T-1) 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.

14. 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.

15. 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.

16. 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.

17. 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) Chlorofluorocarbon
(d) Carbon Monoxide

Correct Answer: (c) Chlorofluorocarbon

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.

18. 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:The molecular formula of ozone is O₃. It is a gas consisting of three atoms of oxygen, which is found in very small quantities in the atmosphere.

19. 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 warming of the Earth’s atmosphere due to the accumulation of gases in the atmosphere is called the greenhouse effect. These greenhouse gases include carbon dioxide, water vapor, methane, etc.

20. 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.

Science & Biotechnology

11. Name the International treaty designed to protect the ozone layer from CFCs. [S.S.C. Online CHSL (T-I) 24.01.2017 (Shift-II)]

12. 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)]

13. Which of the following is least likely to be an effect of global warming? [S.S.C. Online Graduate Level (T-1) 6.09.2016 (Shift-II)]

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

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

16. 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)]

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

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

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

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

Related Posts