2546: What is the role of ultraviolet (UV) radiation in the water purification systems?
1. It inactivates/kills the harmful micro-organism in water.
2. It removes all the undesirable odours from the water.
3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
2547: With reference to the economic history of medieval India, the term 'Araghatta' refers to
(a) bonded labour
(b) land grants made to military officers
(c) waterwheel used in the irrigation of land
(d) wasteland converted to cultivated land
2548: Match List I with List II and select the correct answer using the codes given below the Lists :
List I-------------------List II
I. German Silver---------(A) Tin
II. Solder----------------(B) Nickel
III. Bleaching Powder-----(C) Sodium
IV. Hypo-----------------(D) Chlorine
Codes:
(a) I-A, II-B, III-D, IV-C
(b) I-B, II-A, III-C, IV-D
(c) I-A, II-B, III-C, IV-D
(d) I-B, II-A, III-D, IV-C
2549: Lineage is:
(a) A straight line joining any two points on the globe
(b) The line of descendants of a particular ancestor
(c) The paleolithic age
(d) The linking of genes
2550: Among the following cities, which one is at the highest altitude above mean sea level?
(a) Bangalore
(b) Delhi
(c) Jodhpur
(d) Nagpur