246: Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, but a lot of it does not remain in the lower atmosphere because of
1. Its escape into the outer strato-sphere.
2. The photosynthesis by phyto-plankton in the oceans.
3. The trapping of air in the polar ice caps
Which of the statements given above is/are correct?
(a) 1 and 2
(b) 2 only
(c) 2 and 3 only
(d) 3 only
247: If a potato is placed on a pure paper plate which is white and unprinted and put in a microwave oven, the potato heats up but the paper plate does not. This is because:
(a) Potato contains water whereas paper does not contain water
(b) Potato transmits microwaves whereas paper reflects microwaves
(c) Potato is mainly made up of starch whereas paper is mainly made up of cellulose
(d) Potato is a fresh organic material whereas' paper is a dead organic material
248: During Indian freedom struggle, the National Social Conference was formed. What was the reason for its formation?
(a) Different social reform groups or organizations of Bengal region united to form a single body to discuss the issues of larger interest and to prepare appropriate petitions/representations to the government.
(b) Indian National Congress did not want to include social reforms in its deliberations and decided to form a separate body for such a purpose
(c) Behramji Malabari and M. G. Ranade decided to bring together all the social reform groups of the country under one organization
(d) None of the statements (a), (b) and (c) given above is correct in this context
249: Which one of the following is not a lagoon?
(a) Ashtamudi lake
(b) Chilka lake
(c) Periyar lake
(d) Pulicat lake
250: The Indian Muslims, in general, were not attracted to the Extremist movement because of the
(a) influence of Sir Sayyid Ahmed Khan
(b) anti-Muslim attitude of extremist leaders
(c) indifference shown to Muslim aspirations
(d) Extremists policy of harping on Hindu past