2641: Ready source of energy is available for athletes in:
(a) Vitamins
(b) Fats
(c) Proteins
(d) Carbohydrates
2642: Amit has five friends : 3 girls and 2 boys. Amit's wife also has 5 friends : 3 boys and 2 girls. In how many maximum number of different ways can they invite 2 boys and 2 girls such that two of them are Amit's friends and two are his wife's ?
(A) 46
(B) 38
(C) 58
(D) 24
2643: With reference to 'stem cells', frequently in the news, which of the following statements is/are correct?
1. Stem cells can be derived from mammals only.
2. Stem cells can be used for screening new drugs.
3. Stem cells can be used for medical therapies.
Select the correct answer using the codes given below :
(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3
2644: The following are the major oilseeds produced in India :
I. Sesamum
II. Mustard
III. Groundnut
IV. Soyabean
Which one of the following is the correct sequence of the descending order of the quantity of their production ?
(a) I, II, III, IV
(b) III, II, IV, I
(c) II, IV, III, I
(d) III, IV, II, I
2645: Consider the following statements about acetylene :
I. It is used in welding industry.
II. It is raw material for preparing plastics.
III. It is easily obtained by mixing silicon carbide and water.
Of these statements :
(a) I and II are correct
(b) I and III are correct
(c) II and III are correct
(d) I, II and III are correct