General Science Chemistry MCQs

Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination

41. Cream gets separated out of milk when it is churned due to which of the following reasons?

[A] Gravitational pull
[B] Centripetal force
[C] Centrifugal force
[D] Frictional force

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42. Which of the following gases is heavier than oxygen?

[A] Ammonia
[B] Methane
[C] Helium
[D] Carbon dioxide

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43. Which of the following metals (shown by its symbol) is generally used for making filaments of bulb?

[A] Fe
[B] An
[C] Ag
[D] W

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44. Who invented Bakelite, which is one of the first commercially successful plastics of the world?

[A] Leo Baekeland
[B] Otto Bayer
[C] Arthur W. Carpenter
[D] Jean-Baptiste Donnet

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45. Who was the first person to devise a periodic table of chemical elements arranged in order of their relative atomic masses?

[A] Dmitri Mendeleev
[B] John Dalton
[C] John Alexander Reina Newlands
[D] Johann Wolfgang Dobereiner

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46. Which of the following isotope of Hydrogen has only one neutron?

[A] Protium
[B] Deuterium
[C] Tritium
[D] None of them

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47. When a gas ‘X’ reacts with lime water, a compound ‘Y’ is formed. If both X and Y are used as a bleaching agent in chemical industry, then X is__ ?

[A] Ozone
[B] Chlorine
[C] Fluorine
[D] Methane

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48. “Petroleum” can be categorised under which one of the following terms?

[A] Elements
[B] Hydrocarbons
[C] Polymers
[D] Salts

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49. Which is the main source of Naphthalene?

[A] Charcoal
[B] Camphor
[C] Coal-tar
[D] Titanium

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50.

What kind of fertilizer is Urea?

[A] Sodium fertilizer
[B] Phosphatic fertilizer
[C] Nitrogenous fertilizer
[D] Potassium fertilizer

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