491: What are Rubies and Sapphires chemically known as?
(a) Silicon dioxide
(b) Aluminium oxide
(c) Lead tetroxide
(d) Boron nitride
492: The Montague-Chelmsford Proposals were related to
(a) social reforms
(b) educational reforms
(c) reforms in police administration
(d) constitutional reforms
493: A car travels the first one-third of a certain distance with a speed of 10 km/hr, the next one-third distance with a speed of 20 km/hr and the last one-third distance with a speed of 60 km/hr. The average speed of the car for the whole journey is
(a) 18 km/hr
(b) 24 km/hr
(c) 30 km/hr
(d) 36 km/hr
494: Who among the following Governor Generals created the Covenanted Civil Service of India which later came to be known as the Indian Civil Service ?
(a) William Bentinck
(b) Warren Hastings
(c) Wellesley
(d) Cornwallis
495: In ancient Indian historical geography the name Ratnakara denoted
(a) the Arabian Sea
(b) the Bay of Bengal
(c) the Indian Ocean
(d) the the confluence of the Ganga, the Yamuna and the mythical Saraswati at Prayaga