Previous year MCQs

General science UPPSC 2003 GS-I
Question

Consider the following statements and select the correct answer from the code given below:

1. Presence of calcium sulphate makes water hard and unfit for use.
2. Diamond is harder than copper and iron.
3. The main component of air is oxygen.
4. Nitrogen is used in the preparation of vegetable ghee.

Code:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: 1 and 2

Detailed Solution:

The correct answer is “1 and 2”.
1) Hard water is the water that contains salts of calcium and magnesium principally as bicarbonates, chlorides, and sulfates.

2) Diamonds are harder than any metal or stone.

3) Air is made up of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and other gases in meagre amounts.

4) Hydrogen gas is used in the production of vegetable ghee.

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