476: The main constituents of pearl are
(a) calcium carbonate and magnesium carbonate
(b) aragonite and conchiolin
(c) ammonium sulphate and sodium carbonate
(d) calcium oxide and ammonium chloride
477: Which one of the following observations is not true about the Quit India Movement of 1942 ?
(a) It was a spontaneous movement
(b) It was led by Mahatma Gandhi
(c) It was a non-violent movement
(d) It did not attract the labour class in general
478: Abinava Bharat a secret society of revolutionaries was organised by
(a) Khudiram Bose
(b) V. D. Savarkar
(c) Prafulla Chaki
(d) Bhagat Singh
479: The basic reason for the extraordinary sparkle of a suitably cut diamond is that
(a) it has a very high transparency
(b) it has a very high refractive index
(c) it is very hard
(d) it has well-defined cleavage planes
480: Which one of the following statements is false ?
(a) All countries other than India have over 80% literacy
(b) Malaysia and Korea have life expectancy higher than all other countries
(c) Higher the adult literacy lower is the infant mortality
(d) The life expectancy at birth in India is almost the same as that of Indonesia