841: A watch showed a time of fourteen minutes past nine (9 hrs and 14 minutes). The positions of the hour-hand and the minutehand of the watch are exactly interchanged. The new time shown by the watch is closes to which one of the following ?
(A) Fourteen minutes to three
(B) Twelve minutes to three
(C) Thirteen minutes to three
(D) Fifteen minutes to three
842: The basic reason for the extraordinary sparkle of a suitably cut diamond is that
(a) it has a very high transparency
(b) it has a very high refractive index
(c) it is very hard
(d) it has well-defined cleavage planes
843: The hallmark of watershed development in the semi-arid regions of India is the
(a) establishment of sheds on large scale, so that the rain water does not evaporate
(b) undertaking of earthworks, soil conservation measures and tree plantation, so as to conserve soil moisture and recharge underground water
(c) drilling deep tubewells so as to tap water at the rock-strata level
(d) setting up a system of tanks by banking water from seasonal rivers
844: 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
845: Which of the following were the causes for the rapid dissolution of the Mughal empire?
I. Degeneration of the Mughal nobility
II. The absence of the Law of Succession
III. Foreign invasion
Select the correct answer from the codes given below:
(a) II and III only
(b) I and III only
(c) III only
(d) I, II and III