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3 questions · 2011 · answers as per the UPSC key

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UPSC 2011 · Q7 · Science & Technology › Energy & Environment · Save

Microbial fuel cells are considered a source of sustainable energy. Why?

  1. They use living organisms as catalysts to generate electricity from certain substrates.
  2. They use a variety of inorganic materials as substrates.
  3. They can be installed in waste water treatment plants to cleanse water and produce electricity.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
Show answer
Answer: (c) 1 and 3 only
UPSC 2011 · Q32 · Science & Technology › Energy & Environment · Save

The function of heavy water in a nuclear reactor is to

(a) Slow down the speed of neutrons
(b) Increase the speed of neutrons
(c) Cool down the reactor
(d) Stop the nuclear reaction
Show answer
Answer: (a) Slow down the speed of neutrons
UPSC 2011 · Q64 · Science & Technology › Energy & Environment · Save

What is the difference between a CFL and an LED lamp?

  1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
  2. The average life span of a CFL is much longer than that of an LED lamp.
  3. A CFL is less energy-efficient as compared to an LED lamp.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
Show answer
Answer: (c) 1 and 3 only