3521: The water pollution in river is measured by the dissolved amount of

(a) Chlorine
(b) Ozone
(c) Nitrogen
(d) Oxygen
3522: The planet Mercury is revolving in an elliptical orbit around the sun as shown in the given figure. The kinetic energy of mercury is greatest at the point labelled

(a) A
(b) B
(c) C
(d) D
3523: Consider the following rivers :

I. Kishenganga
II. Ganga
III. Wainganga
IV. Penganga

The correct sequence of these rivers when arranged in the north-south direction is

(a) I, II, III, IV
(b) II, I, III, IV
(c) II, I, IV, III
(d) I, II, II, III
3524: With reference to Indian agriculture, which one of the following statements is correct?

(a) About 90 per cent of the area under pulses in India is rainfed.
(b) The share of pulses in the gross cropped area at the national level has double in the last two decades
(c) India accounts for about 15 per cent of the total area under rice in the world
(d) Rice occupies about 34 per cent of the gross cropped area of India
3525: The maturity of a river course is recognised by the presence of

(a) V-shaped valley

(b) Meanders

(c) Gorges

(d) High denudational power