UPSC Government Jobs Exams

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

Read Solution (Total 1)

Iron.....I guess.
10 years agoHelpfull: Yes(0) No(0)

UPSC Other Question

If a tropical rain forest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because [UPSC 2011 (CS-P)] 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