351: A and B can complete work together in 5 days. If a works at twice his speed and B at half of his speed this works can be finished in 4 days. How many days would it take for A alone to complete the job ?
(A) 18
(B) 10
(C) 12
(D) 15
352: Biologists have so far known, found and certified a large number of species in the plant and animal kingdom. In terms of members, the largest found and identified so far are from among the
(a) Fungi
(b) Plants
(c) Insects
(d) Bacteria
353: Which one of the following distance-time graph (x-t) represents one-dimensional uniform motion ?
(a) (a)
(b) (b)
(c) (c)
(d) (d)
354: In which type of rocks, fossils are more abundantly found?
(a) Igneous
(b) Metamorphic
(c) Sedimentary
(d) None of these
355: Which of the following is the correct order of increasing size of the grains of soil particles?
(A) Clay
(B) Silt
(C) Sand
(D) Gravel
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(a) A, B, C, D
(b) D, C, A, B
(c) B, C, A, D
(d) C, D, B, A