26: 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
27: Which of the following statements is correct for Guru Nanak?
(a) He preached punishment for wicked
(b) He preached against Muslims
(c) He preached a war society
(d) He preached that 'God is one'
28: Which of the following weather conditions is indicated by a sudden fall in barometer reading ?
(a) Stormy weather
(b) Calm weather
(c) Cold and dry weather
(d) Hot and sunny Weather
29: Consider the following statements:
1. The Nuclear Security Summits are periodically held under the aegis of the United Nations.
2. The International Panel on Fissile Materials is an organ of International Atomic Energy Agency.
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
30: Swamps are seen in the Siberian rivers because
(a) Freezing of the river near the mouth prevents water to flow to the sea
(b) Rivers are too narrow
(c) Rivers are heavily drained by the large network of canals
(d) Railway bridges built across the rivers obstruct the flow