Which of the following gases is released mostly from landfills in urban areas? (UPSC CDS II 2016- GK Paper)

A. Nitrogen

B. Hydrogen

C. Methane

D. Oxygen

Solution: C

In landfills, waste is decomposed by the action of microorganisms that break down the organic matter. 90 to 98% of the gas released from landfills comprises of Methane and Carbon dioxide. The remaining 2 to 10% includes nitrogen, oxygen, ammonia, sulfides, hydrogen and various other gases.

Methane is also released from oil and natural gas systems, paddy fields, coal mining, stationary and mobile combustion, wastewater treatment, and certain industrial processes.

Hence, option (C) is correct.

You can download CDS I 2022 Question Papers and Answer Key. 

Comments

Post a Comment

Popular posts from this blog

Which of the following mineral acids is found in human stomach?

A. Hydrochloric acid B. Lactic acid C. Uric acid D. Methanoic acid Solution: A Hydrochloric acid is found in the human stomach. Its chemical formula is HCl, and it helps in digestion by decomposing complex, large food molecules into simpler ones. The acid activates the pepsinogen enzyme, which is necessary for protein digestion. It also kills dangerous germs in the stomach. Hence, (a) is the correct answer. Know more about Vitamins and Minerals and their deficiency diseases .
Read more

Which of the following enzymes is used in the stabilization of rice bran oil? (RRB NTPC CBT-2 9 May 2022 Shift 1 Paper)

A. Hydrolase B. Catalase C. Lipase D. Cellulase Solution: C Lipase enzymes are used in the stabilisation of rice bran oil. Stabilisation of rice bran is important as it can become rancid during storage.  Enzymes are deactivated via proper stabilisation and maximum nutrients are retained. Thermal treatment is the most common method to stabilize rice bran. Rice bran is a by-product of milled rice. It contains many micronutrients like proteins, carbohydrates, oil, tocopherols, phytosterols, etc.   Hence, option (C) is correct. Read Biology Study Notes . 
Read more

What is the chemical formula of Silica?

  A. NaAlO 2 B. H 2 O C. Al 2 O 3 D. SiO 2      Solution: D The Chemical formula for Silica is SiO2. Silica is the common name for Silicon Dioxide. It is commonly found in quartz. SiO2 forms 3-dimensional network solids in which each silicon atom is covalently bonded in a tetrahedral manner to 4 oxygen atoms.  Hence, option (D) is correct. Read more about Chemical Compounds and their formulae .
Read more