371: Six roads lead to a country. They may be indicated by letters X, Y, Z and digits 1, 2, 3. When there is storm, Y is blocked. When there are floods X, 1 and 2 will be affected. When road 1 is blocked, Z also is blocked. At a time when there are Hoods and a storm also blows, which road(s) can be used ?
(a) Z and 2
(b) Only Z
(c) Only 3
(d) Only Y
372: In a tournament each of the participants was to play one match against each of the other participants. 3 players fell ill after each of them had played three matches and had to leave the tournament. What was the total number of participants at the beginning, if the total number of matches played was 75 ?
(A) 12
(B) 10
(C) 8
(D) 15
373: Given below are colours of the visible spectrum. Identify the correct sequence in order of Increasing wavelengths.
(a) Red, Yellow, Blue, Violet
(b) Violet, Yellow, Blue, Red
(c) Blue, Yellow, Red, Violet
(d) Violet, Blue, Yellow, Red
374: Why DDT is banned in western countries?
(a) It remains in environment for a long time
(b) The insects are immunised
(c) It is a highly poisonous insecticide
(d) None of the above
375: There was no independent development of industries in India during British rule because of the
(a) absence of heavy industries
(b) scarcity of foreign capital
(c) scarcity of natural resources
(d) preference of the rich to invest in land