21: Painted greyware is attributed to

(a) Vedic period

(b) Guptas

(c) Mauryas

(d) Indus valley civilisation
22: Match List I with List II and select the correct answer using the codes given below the lists :

List I------------- List II

I. Blue vitriol (A) Sodium bicarbonate
II. Epsom salt (B) Sodium hydroxide
III. Baking soda (C) Magnesium sulphate
IV. Caustic soda (D) Copper sulphate

Codes:

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

(b) I-D, II-C, III-C, IV-A

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

(d) I-D, II-C, III-A, IV-B
23: In an examination, every candidate took Physics or Mathematics or both 65.8% took Physics and 50.2% took Mathematics. The total number of candidates was 2000. How many took both Mathematics and Physics ?

(a) 750

(b) 700

(c) 550

(d) 500
24: Survey of India is under the Ministry of

(a) Defence

(b) Environment and forests

(c) Home Affairs

(d) Science and Technology
25: Where was the first conference of the Pugwash Conferences on Science and World Affairs held in the Year 1957 ?

(a) Nova Scotia (Canada)
(b) Nagasaki (Japan)
(c) Minnow brook (USA)
(d) Rhode Island (USA)