4531: In India, the steel production industry requires the import of
(a) saltpetre
(b) rock phosphate
(c) coking coal
(d) All of the above
4532: Isohyets are the lines drawn on a map connecting points having:
(a) Equal temperature
(b) Equal height
(c) Equal atmospheric pressure
(d) Equal rainfall
4533: Zero was invented by
(a) Aryabhata
(b) Varahamihira
(c) Bhaskara I
(d) an unknown Indian
4534: With reference to Stree Shakti Puraskar, for which one of the following is "Devi Ahilya Bai Holkar Award" given?
(a) Administrative skills
(b) Achievements in Scientific Research
(c) Achievements in Sports and Games
(d) Courage and valour
4535: Which one of the following pairs is not correctly matched?
(a) Pitt's India Act : Warren Hastings
(b) Doctrine of Lapse : Dalhousie
(c) Vernacular Press Act : Curzon
(d) Ilbert Bill : Ripon