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

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

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

Answer: Option [D]


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

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

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

Answer: Option [A]
16 Hydrogen fuel cell vehicles produce one of the following as “exhaust”
A H2O2

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

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

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

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

Answer: Option [B]

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