UPSC Government Jobs Exams

Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is mercury used in the manufacture of these lamps? [UPSC 2010 (CS-P)]

A mercury coating on the inside of the lamp makes the light bright white.
When the lamp is switched on, the mercury in the lamp causes the emission of ultra – violet radiations.
When the lamp is switched on, it is the mercury which converts the ultra – violet energy into visible light.
None of the statement given above is correct about the use of mercury in the manufacture of fluorescent lamps

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UPSC Other Question
In the structure of planet. Earth, below the mantle, the core is mainly made up of which one of the following? [UPSC 2009(CS-P)]

Aluminium
Chromium
Iron
Silicon 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? [UPSC 2011 (CS-P)]

1 only
2 and 3 only
1 and 3 only
1, 2 and 3