736: What are Rubies and Sapphires chemically known as?
(a) Silicon dioxide
(b) Aluminium oxide
(c) Lead tetroxide
(d) Boron nitride
737: The first Indian State to have its Human Development Report prepared and released by Amartya Kumar Sen in Delhi is
(a) West Bengal
(b) Kerala
(c) Madhya Pradesh
(d) Andhra Pradesh
738: A walks around a circular field at the rate of one round per hour while B runs around it at the rate of six rounds per hour. They start in the same direction from the same point at 7.30 a.m. They shall first cross each other at
(a) 8.30 a.m.
(b) 8.10 a.m.
(c) 7.48 a.m.
(d) 7.42 a.m.
739: The minute arm of a clock is 10 cm long. The number of minutes taken by the tip of the arm to travel a length of 10 cm is nearly equal to:
(a) 5
(b) 10
(c) 15
(d) 20
740: Which of the following is not favourable for the formation of deltas?
(a) Calm winds
(b) Currents and tides
(c) Sheltered coast
(d) No large lakes in the river course