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16: Why camphor disappears when kept on a plate?

(a) It sublimes

(b) It reacts with the metal of the container

(c) It reacts with the gases of the air

(d) None of the above
17: Which of the following groups represents the correct order of four types of teeth in human beings?

(a) Incisors, premolars, molars, canines

(b) Incisors, canines, premolars, molars

(c) Molars, canines, incisors, premolars

(d) Canines, incisors, molars, premolars
18: The sex of the offspring is determined, when:

(a) The conception takes place

(b) The sperm fertilises the ovum

(c) The embryo is partially developed

(d) The end of gestation period is near
19: Though a few (gas-based) industries have already been established good reserves of natural gas in India remain unutilised. This vast resource of natural gas can be used in the production of

(a) fertilizers

(b) carbide

(c) graphite

(d) synthetic petroleum
20: Colour blindness is:

(a) More common among women

(b) Very rare in women

(c) Very rare in men

(d) Found to the same extent in both the sexes
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UPSC CSE MCQs

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