636: Consider the following statements about acetylene :
I. It is used in welding industry.
II. It is raw material for preparing plastics.
III. It is easily obtained by mixing silicon carbide and water.
Of these statements :
(a) I and II are correct
(b) I and III are correct
(c) II and III are correct
(d) I, II and III are correct
637: Zayed bin Sultan-al-Nahyan was a long serving President of which of the following ?
(A) Oman
(B) United Arab Emirates
(C) Kuwait
(D) Saudi Arabia
638: Assertion (A):
India does not export natural rubber.
Reason (R) :
About 97% of India's demand for natural rubber is met from domestic production.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
639: Which one of the following is used as an explosive?
(a) Nitroglycerine
(b) Phosphorus trichloride
(c) Mercuric oxide
(d) Graphite
640: Which one of the countries labelled as 1, 2, 3 and 4 on the given map was grantee membership of G -15 in its VII Summit at Kuala Lumpur ?
(a) 1
(b) 2
(c) 3
(d) 4