4246: Consider the following statements :
1. Caffeine, a constituent of tea and coffee is a diuretic.
2. Citric acid is used in soft drinks.
3. Ascorbic acid is essential for the formation of bones and teeth.
4. Citric acid is a good substitution for ascorbic acid in our nutrition.
Which of the statements given above are correct ?
(a) 1 and 2, only
(b) 1, 2 and 3, only
(c) 3 and 4 only
(d) 1, 2, 3 and 4
4247: What is the correct chronological order of the following?
I. First Round Table Conference
II. Gandhi-lrwin Pact
III. Simon Commission
IV. Cripps Mission
(a) III, I, II, IV
(b) I, II, III, IV
(c) II, I, III, IV
(d) IV, III, II, I
4248: The year of 'Great Divide', in Indian demography, is:
(a) 1905
(b) 1921
(c) 1947
(d) 1965
4249: Consider the following pairs : Region Well-known for the production of
1. Kinnaur : Area nut
2. Mewat : Mango
3. Coromandel : Soya bean
Which of the above pairs is/are correctly matched ?
(a) 1 and 2 only
(b) 3 only
(c) 1, 2 and 3
(d) None
4250: With reference to the latest developments in stem cell research, consider the following statements:
1. The only source of human stem cells are the embryos at blastocyst stage
2. The stem cells can be derived a without causing destruction to blastocysts
3. The stem cells can regenerate themselves in vitro virtually forever
4. Indian research centres also created a few cell lines which can be developed into many types of tissues
Which of these statements are correct?
(a) 1, 2, 3 and 4
(b) 1, 2 and 3
(c) 1, 2 and 4
(d) 3 and 4