2046: Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers, etc?
(a) Nickel and cadmium
(b) Zinc and carbon
(c) Lead peroxide and lead
(d) Iron and cadmium
2047: Consider the following statements :
I. Tides are of great help in navigation and fishing.
II. High tide enables big ships to enter or leave the harbour safely.
III. Tide prevents siltation in the harbours.
IV. Kandla and Diamond Harbour are tidal ports.
Which of these statements are correct ?
(a) I and IV
(b) II, III and IV
(c) I, II and III
(d) I, II, III and IV
2048: The dispute regarding the election of Prime Minister and President of India can be decided by:
(a) High Court
(b) Election Tribunal
(c) Chief Election Commissioner
(d) None of the above
2049: Other than Jatropha curcas, why is Pongamia pinnata also considered a good option for the production of bio-diesel in India ?
1. Pongamia pinnata grows naturally in most of the arid regions of India.
2. The seeds of Pongamia pinnata are rich in lipid content of which nearly half is oleic acid.
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
2050: Which of the following crops has the highest photosynthetic activity?
(a) Cotton
(b) Sugarcane
(c) Rice
(d) Wheat