70. The angles of elevation of the top of a tower from two points A and B at a distance p and q respectively, from the base of the tower and in the same straight line with it, are complementary. The height of the tower is:
(A) p + q
(B) (pq)^(1/2)
(C) (pq)^2
(D) (pq)^(1/3)
(E) Question not attempted
71. If the lengths of diagonals of two squares are in the ratio 4:7, then the ratio of their areas is:
(A) 16:49
(B) 64:343
(C) 2:1
(D) 4:7
(E) Question not attempted
72. Select the incorrectly matched pair of biosphere reserve and its region.
(A) Thar Desert – Rajasthan
(B) Kanha – Madhya Pradesh, Uttar Pradesh
(C) Manas – Assam
(D) Nilgiri – Karnataka, Kerala
(E) Question not attempted
73. Select the incorrect statement about the genetic code.
(A) 61 codons code for amino acids.
(B) UUU codes for phenylalanine.
(C) AUG only acts as initiator codon and has no other function.
(D) The codon is triplet.
(E) Question not attempted
74. Which of the following nitrogenous base is not a component of DNA?
(A) Cytosine
(B) Adenine
(C) Guanine
(D) Uracil
(E) Question not attempted