3531: In an objective test there are 60 questions. Each question carries four alternative answers only one of which is correct. Suppose A and B are two candidates both of whom know correct answers to 30 questions. A answers only 30 questions while B answers all 60 questions choosing answers at random for those he does not know the answers of. If each question carries a mark of 1 and no negative marks are awarded, the marks obtained by B are expected to be larger than those obtained by A by
(a) 0
(b) 15
(c) 5
(d) 7.5
3532: Man cannot digest cellulose whereas cows can do so because
(a) Their gut contains certain bacteria capable of digesting cellulose
(b) They have a many-chambered stomach
(c) They have efficient grinding molars
(d) They produce an enzyme cellulose which can digest cellulose
3533: Consider the following statements regarding environment issues of India:
I. Gulf of Mannar is one of the biosphere reserves.
II. The Ganga Action Plan, phase II has been merged with the National River Conservation Plan.
III. The National Museum of Natural History at New Delhi imparts non-formal education in environment and conservation.
IV. Environmental Information System (ENVIS) acts as a decentralised information network for environmental information.
Which of these statements are correct ?
(a) I, II and IV
(b) I, II, III and IV
(c) II and III
(d) I, III and IV
3534: How many minimum number of colours will be required to paint all the sides of a cube without the adjacent sides having the same colours?
(a) 3
(b) 4
(c) 5
(d) 6
3535: Stainless steel contains which of the following?
(a) Aluminium and Zinc
(b) Chromium and Carbon
(c) Zinc and Mercury
(d) Copper and Cadmium