821: Consider the following statements :
In a nuclear reactor, self-sustained chain reaction is possible, because
I. more neutrons are released in each of the fission reactions.
II. the neutrons immediately take part in the fission process.
III. the fast neutrons are slowed down by Graphite.
IV. every neutron realeased in the fission reaction initiates further fission.
Which of these statements are correct ?
(a) I, II and III
(b) I and III
(c) II and IV
(d) II, III and IV
822: Bhakra Nangal, Hirakud and Kosi projects are situated on the rivers:
(a) Sutlej, Mahanadi and Kosi
(b) Sutlej, Mahanadi and Purna
(c) Mahanadi, Beas, Godavari
(d) Beas, Mahanadi, Sutlej
823: The concept of welfare state is included in the Constitution of India in:
(a) Preamble
(b) Fundamental Rights
(c) Fourth Schedule
(d) Directive Principles of State Policy
824: What happens when alcohol is taken in excess?
(a) It destroys the liver
(b) It produces inflammation of the stomach
(c) It causes the heart to become weak
(d) All of the above
825: Chlorine is:
(a) A rare earth element
(b) A halogen
(c) A noble gas
(d) Coinage metal