UPSC 2001 › Science & Technology › Energy & Environment

3 questions · 2001 · answers as per the UPSC key

Take test Free Study this topic: Science and Technology
All years of Energy & Environment · Full UPSC 2001 paper
UPSC 2001 · Q11 · Science & Technology › Energy & Environment · Save

Consider the following organisations:

I. Atomic Minerals Directorate for Research and Exploration II. Heavy Water Board III. Indian Rare Earths Limited IV. Uranium Corporation of India

Which of these is/are under the Department of Atomic Energy?

(a) I only
(b) I and IV
(c) II, III and IV
(d) I, II, III and IV
Show answer
Answer: (d) I, II, III and IV
UPSC 2001 · Q106 · Science & Technology › Energy & Environment · Save

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 released 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
Show answer
Answer: (b) I and III
UPSC 2001 · Q113 · Science & Technology › Energy & Environment · Save

A radioactive substance has a half-life of four months. Three fourth of the substance would decay in

(a) 3 months
(b) 4 months
(c) 8 months
(d) 12 months
Show answer
Answer: (c) 8 months