1461: 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
1462: Match List I with List II and select the correct answer by using the codes given below the lists :
List I-------List II
(Minerals)-- (Typical areas of Occurrence)
I. Coal----- (A) Bhandara
II. Gold-----(B) Karanpura
III. Mica----(C) Hutti
IV. Manganese--- (D) Nellore
Codes:
(a) I-A, II-C, III-B, IV-D
(b) I-B, II-C, III-D, IV-A
(c) I-C, II-D, III-B, IV-A
(d) I-B, II-A, III-D, IV-C
1463: Consider the following climatic conditions (northern hemisphere) :
Temperature degree C - Rainfall Cm.
J 3.9 4.7
F 4.4 5.7
M 8.3 8.2
A 14.4 9.2
M 20.0 9.2
J 23.3 17.7
J 27.8 14.5
A 27.8 14.0
S 22.3 12.7
O 18.3 7.0
N 12.2 5.0
D 6.7 3.5
These are most likely to be found in the natural regions of
(a) China type
(b) Equatorial type
(c) Hot desert type
(d) Monsoon type
1464: With reference to the revolt of the year 1857, who of the following was betrayed by a friend; captured and put to death by the British ?
(a) Nana Sahib
(b) Kunwar Singh
(c) Khan Bahadur Khan
(d) Tantia Tope
1465: In a carrom board game competition, m boys and n girls(m > n > 1) of a school participate in which every student has to play exactly one game with every other student. Out of the total games played; it was found that in 221 games one player was a boy and the other player was a girl.
Consider the following statements:
1. The total number of students that participated in the competition is 30.
2. The number of games in which both players were girls is 78.
Which of the statements given above is/are correct?
(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 nor 2