1761: Consider the following statements :
Coke is one of the materials of the charge added to blast furnace for the production of steel/iron. Its function is to
I. act as a reducing agent.
II. remove silica associated with the iron ore.
III. function as fuel, to supply heat.
IV. act as an oxidizing agent.
Of these statements:
(a) I and II are correct
(b) II and IV are correct
(c) I and III are correct
(d) III and IV are correct
1762: What are Rubies and Sapphires chemically known as?
(a) Silicon dioxide
(b) Aluminium oxide
(c) Lead tetroxide
(d) Boron nitride
1763: It takes one minute to fill 3/7 th of a vessel. What is the time taken in minutes to fill the whole of the vessel ?
(a) 4/3
(b) 3/4
(c) 7/3
(d) 3/2
1764: With reference to the revolt of the year 1857, who of the following was betrayed by a friend; captured and put to death by the British ?
(a) Nana Sahib
(b) Kunwar Singh
(c) Khan Bahadur Khan
(d) Tantia Tope
1765: If a mouse of over eight times its normal size has been produced by introducing human growth hormone gene, the technique involved is called
(a) Hybridisation
(b) Genetic engineering
(c) Mutation Breeding
(d) Hormonal feeding