Chemistry
11. Dry ice is the solid form of :
(A) Carbon dioxide
(B) Nitrogen
(C) Water
(D) Air
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Correct Answer: (A)
12. The gas that causes suffocation and death when coal or coke is burnt in a closed room is :
(A) Ethane
(B) Methane
(C) Carbon dioxide
(D) Carbon monoxide
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Correct Answer: (C)
13. Acid rain is caused by the pollution of environment by :
(A) Carbon dioxide and nitrogen
(B) Nitrous oxide and sulphur dioxide
(C) Carbon monoxide and carbon dioxide
(D) Ozone and carbon dioxide
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Correct Answer: (B)
14. …………….. was the inventor of atomic theory ?
(A) Henery Bacqurel
(B) Rutherford
(C) Madam Curie
(D) Irine Curie
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Correct Answer: (A)
15. Which method of water purification does not kill microorganism ?
(A) Boiling
(B) UV-irradiation
(C) Filtration
(D) Chlorination
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Correct Answer: (C)
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