516: Most of the explosions in mines occur due to the mixing of
(a) hydrogen with oxygen
(b) oxygen with acetylene
(c) methane with air
(d) carbon dioxide with ethane
517: If x and y are positive integers such that (3x + 7y) is a multiple of 11, then which of the followings are divisible by 11?
518: "The Congress is tottering to its fall and one of my great ambitions while in India, is to assist it to a peaceful demise." This statement is attributed to
(a) Lord Dufferin
(b) Lord Curzon
(c) Lord Lytton
(d) None of the above
519: Which one following companies had started a rural marketing network called e chaupal?
(a) ITC
(b) Dabur
(c) Proctor and Gamble
(d) Hindustan Lever
520: In the map given below, four islands of Indian Ocean region i.e. (A) Seychelles, (B) Chagos, (C) Mauritius and (D) Socatra are marked as 1, 2, 3 and 4. Match them and select the correct answer from the codes given below.
Codes:
A B C D
(a) 1 3 4 2
(b) 3 1 2 4
(c) 1 3 2 4
(d) 3 1 4 2