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591: Acid rain is caused by pollution of environment by:

(a) Carbon dioxide and nitrogen

(b) Carbon monoxide and carbon dioxide

(c) Ozone and carbon dioxide

(d) Nitrous oxide and sulphur dioxide
592: Who among the following Sultans declared himself as a lieutenant of Caliph?

(a) Balban

(b) Iltutmish

(c) Ferozeshah Tughlaq

(d) Muhammad-bin-Tughlaq
593: Who of the following scientists proved that the stars with mass less than 1.44 times the mass of the Sun end up as White Dwarfs when they die?

(a) Edwin Hubble
(b) S. Chandrashekhar
(c) Steven Weinberg
(d) Stephen Hawking
594: Match List I (Books) with List II (Authors) and select the correct answer using the codes given below the Lists :

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

I. My Music, My Life----(A) Laxman Gaikwad
II. Adha Gaon----------(B) Rahi Masoom Raza
III. Radha--------------(C) Ramakanta Rath
IV. The Pilferer---------(D) Ravi Shankar

Codes:

(a) I-C, II-B, III-D, IV-A
(b) I-D, II-B, III-C, IV-A
(c) I-D, II-A, III-C, IV-B
(d) I-C, II-A, III-D, IV-B
595: A schoolteacher has to select the maximum possible number of different groups of 3 students out of a total of 6 students. In how many groups any particular student will be included?

(a) 8
(b) 12
(c) 6
(d) 10
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