Question

Cooking food by covering, is the method to save ________________.
(A) LPG
(B) CNG
(C) BNG
(D) None of these

Answer 1

Hint Cooking is done by using the gas cylinders which are composed of Liquefied Petroleum Gas (LPG). Cooking the food by covering uses almost half of the energy only which is thus a measure to save LPG. LPG is a colorless and odorless gas.

Complete Step By Step Solution:
Liquefied Petroleum Gas contains propane and butane as its normal components. It is filled in the gas cylinders which are used for cooking the food. Covering the pan in which the food is being cooked saves a lot more energy as compared to the uncovered pans because covering the pans helps in trapping the heat which makes the food to cook faster as compared to the uncovered ones. On an estimate around $3%$ of energy per pan is saved by covering it. Therefore we can save a lot of LPG which is the source of energy to cook food by using the cylinders by simply covering the cooking pans.

So, the correct choice is (A).

Additional Information:
LPG is extracted from crude oil and natural gas which is much cleaner fuel as compared to coal fired energy generation which highly contributes toward carbon dioxide emission. LPG is used in vehicles, cooking equipment and in heating appliances. It is also being used as refrigerant in order to replace chlorofluorocarbons which damage the ozone layer. LPG is mostly entirely derived from fossil fuel sources as it is prepared by refining petroleum. LPG was first produced by Dr. Walter Snelling in 1910. It is quite environmentally friendly as it burns with very less sulfur emissions. It is a flammable gas and evaporates quickly at normal temperature and pressure. LPG can cause suffocation if it gets leaked and it can also result in explosion if no ignition source is present.

Note: LPG is a mixture of hydrocarbons with propane and butane as its main components. It is used as an efficient fuel in industrial, agriculture, construction and many more sectors. It is cost effective as compared to other fuels. Burning LPG produces carbon dioxide but quite less compared to oil and coal.
LPG is odorless gas so ethyl mercaptan is added in cylinders to sense the leakage of gas. The energy content of PLG is approximately $25\text{MJ}$ per liter.