1741: Arrange the following fertilisers according to the decreasing order of their nitrogen content:
I. Ammonium sulphate
II. Ammonium nitrate
III. Potassium nitrate
IV. Urea
(a) IV, II, III, I
(b) IV, II, I, III
(c) IV, III, II, I
(d) II, IV, III, I
1742: On 21st June, the Sun
(a) does not set below the horizon at the Arctic Circle
(b) does not set below the horizon at Antarctic Circle
(c) shines vertically overhead at noon on the Equator
(d) shines vertically overhead at the Tropic of Capricorn