General Knowledge

1. Greenockite is the mineral of which metal?
Ans: Cadmium

2. Which is the most unstable naturally occurring element?
Ans: Francium

3. Which organisms are useful to scientists in assessing the effects of air pollution, ozone depletion and metal contamination?
Ans: Lichens

4. Which is the world's biggest single structure made by living organisms?
Ans: Great Barrier Reef

5. Which regional office of Reserve Bank of India holds most of India's gold reserves?
Ans: Nagpur Branch