641: INS Trishul acquired by the Indian Navy in 2003 has been built by:

(a) Israel
(b) USA
(c) Russia
(d) France
642: If a commodity is provided free to the public by the Government, then

(a) the opportunity cost is zero.
(b) the opportunity cost is ignored.
(c) the opportunity cost is transferred from the consumers of the product to the tax-paying public.
(d) the opportunity cost is transferred from the consumers of the product to the Government.
643: The sea territory of India extends up to:

(a) 4 nautical miles

(b) 12 nautical miles

(c) 200 nautical miles

(d) None of these
644: A radioactive substance has a half-life of four months. Three-fourth of the substance would decay in

(a) 3 months

(b) 4 months

(c) 8 months

(d) 12 months
645: The product life cycle from inception to demise is shown in the graph. Match List I with List II and select the correct answer using the codes given below the Lists :

Codes:

(a) I-A, II-D, III-B, IV-C
(b) I-A, II-D, III-C, IV-B
(c) I-D, II-A, III-B, IV-C
(d) I-D, II-A, III-C, IV-B