Answer: D) Methane Explanation: Natural gas is primarily composed of methane, but also contains ethane, propane, and heavier hydrocarbons.   Natural gas is a colorless, tasteless, odorless, and non-toxic gas. Because it is odorless, mercaptan is added to the natural gas, in very small amounts to give the gas a distinctive smell of rotten eggs. This strong smell can alert you of a potential gas leak.   It also contains small amounts of nitrogen, carbon dioxide, hydrogen sulphide and trace amounts of water.

Affection for-

Answer: A) The wildcard mask is incorrect Explanation: The administrator typed in the wrong wildcard mask configuration. The wildcard should have been 0.0.0.255 or even 0.255.255.255.

भारत के पूर्व राष्ट्रपति डॉ. ए.पी.जे. अब्दुल कलाम को किस वर्ष भारत रत्न पुरस्कार प्राप्त हुआ:

(सी) 1997

Answer: B) calcium bicarbonate Explanation: Temporary hardness is due to the presence of soluble bicarbonates of calcium and magnesium in water. Permanent hardness is due to the presence of sulphates and chlorides of calcium and magnesium.