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CSAT Prelims Chemistry - General Knowledge Questions and Answers for UPSC Exam | Page-2

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Free download PDF of General knowledge(gk) multiple choice questions(mcqs) and answers on Chemistry. These general awareness quiz objective questions answers include mcqs on chromium, oxygen, acetylene etc.
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(11) A small pouch containing silica gel is often found in bottles of medicine in tablet or powder form because silica gel
[A] kills bacteria
[B] kills germ and spores
[C] absorbs all gases present inside the bottle
[D] absorbs moisture

Comment

Answer: Option [D]
(12) Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance ?
[A] Nickel
[B] Aluminium
[C] Tungsten
[D] Chromium

Comment

Answer: Option [D]

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(13) Which one of the following statements is NOT correct ?
[A] All alkaline earth metals form hydrated salts
[B] Barium and strontium are found free in nature
[C] Gypsum is added to the cement to slow down its rate of setting
[D] The presence of NaCl increases the rate of setting of Plaster of Paris

Comment

Answer: Option [B]
(14) Which one of the following pairs of metals constitutes the hightest metal and the heaviest metal, respectively ?
[A] Aluminium and mercury
[B] Aluminium and osmium
[C] Lithium and osmium
[D] Lithium and mercury

Comment

Answer: Option [C]
(15) The offending substance in the liquor tragedies leading to blindness etc. is
[A] methyl alcohol
[B] benzyl alcohol
[C] amyl alcohol
[D] ethyl alcohol

Comment

Answer: Option [A]
(16) Hydrogen fuel cell vehicles produce one of the following as “exhaust”
[A] H2O2
[B] H2O
[C] CH4
[D] NH3

Comment

Answer: Option [B]
(17) Which one of the following is used as an anti-freeze for the automobile engines ?
[A] Ethanol
[B] Methanol
[C] Propyl alcohol
[D] Ethylene glycol

Comment

Answer: Option [D]
(18) Aspartame is an artificial sweetener sold in the market. It consists of amino acids and provides calories like other amino acids. Yet, it is used as a low-calorie sweetening agent in food items. What is the basis of this use ?
[A] When aspartame is used in food processing, the sweet taste remains , but becomes resistant to oxidation
[B] Aspartame is several times sweeter than table sugar, hence food items made with small quantities of aspartame yield fewer calories on oxidation
[C] Aspartame is as sweet as sugar, but after ingestion into the body, it is converted into metabolites that yield no calories
[D] Aspartame is as sweet as table sugar, but unlike table sugar, it is not readily oxidized in human body due to lack of requisite enzymes

Comment

Answer: Option [B]
(19) Acid rain is caused by the pollution of environment by
[A] Nitrous oxide and sulphur dioxide
[B] Ozone and carbon dioxide
[C] Carbon dioxide and nitrogen
[D] Carbon monoxide and carbon dioxide

Comment

Answer: Option [A]
(20) Which one of the following is an active component of oil of clove ?
[A] Menthol
[B] Eugenol
[C] Methanol
[D] benzaldehyde

Comment

Answer: Option [B]

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