What is the difference between LPG and LNG?

LPG (Liquefied Petroleum Gas) is primarily a mixture of propane and butane obtained as a byproduct of crude oil refining and natural gas processing. It liquefies under moderate pressure or low temperature. LNG (Liquefied Natural Gas) is mainly methane cooled to about -160°C to convert it into liquid form for transport. LNG occupies about 1/600th of its gaseous volume, while LPG occupies about 1/260th of its gaseous volume.

How does an induction stove work?

An induction stove works using electromagnetic induction. Alternating current flows through a copper coil beneath the glass surface, creating a rapidly changing magnetic field. This magnetic field induces eddy currents in compatible metal cookware, generating heat directly in the pan without heating the cooktop surface.

What is uranium enrichment?

Uranium enrichment is the process of increasing the concentration of Uranium-235 (U-235) in natural uranium. Civilian nuclear reactors typically use low enriched uranium containing 3–5% U-235. Higher enrichment levels are used for military applications, as greater enrichment allows smaller and lighter nuclear weapons.

What are the main processes involved in ethanol production from cereal grains?

Ethanol production from cereal grains involves fermentation, distillation, and dehydration. Starch from grains is first converted into simple sugars, which are fermented by yeast to produce alcohol. The alcohol is then distilled and dehydrated to achieve high purity ethanol suitable for fuel blending.

What is the Central Agro-Meteorological Observatory (CAgMO)?

The Central Agro-Meteorological Observatory (CAgMO) in Pune is operated by the India Meteorological Department under the Ministry of Earth Sciences. It is India's first fully digital meteorological observatory, recording automated surface weather data such as temperature, rainfall, soil moisture, pressure, and wind speed.

What is the difference between low enriched uranium and high enriched uranium?

Low enriched uranium (LEU) contains 3–5% Uranium-235 and is mainly used in civilian nuclear reactors. High enriched uranium (HEU) contains much higher concentrations of U-235 and is typically used in nuclear weapons and certain research reactors.

Why is LNG stored in cryogenic tanks?

LNG must be stored in cryogenic tanks because it is maintained at extremely low temperatures (around -160°C) to remain in liquid form. This reduces its volume significantly and enables efficient long-distance transportation.

Daily UPSC Prelims MCQs - Science & Tech. - 1st April 2026

Jigyashu Mishra
Mar 31
1 min read

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