Machine-translated by Google. Questions are authored in English.
Top

Natural Resources Questions and Answers

51.

The process of splitting bigger hydrocarbon into smaller hydrocarbon molecules is called

Exam Year(s)

UGC NET - 2012,

Answer: C

The process of splitting bigger hydrocarbon molecules into smaller ones is cracking, carried out thermally or with a catalyst in refineries to raise the yield of petrol-range fuels. Pyrolysis is the decomposition of material by heat in the absence of oxygen and is a broader term, thermal decomposition is a general phrase for breaking down by heat, and combustion is burning in oxygen to give carbon dioxide and water. Only cracking names the specific conversion of large hydrocarbons to small ones.

Please log in or register to report this question.

Discuss in Forum
52.

An earthquake measuring over 8 on Richter Scale is rated as

Exam Year(s)

UGC NET - 2012,

Answer: C

On the Richter scale an earthquake of magnitude 8 or more is classed as great, with major for magnitude 7 to 7.9, strong for 6 to 6.9, moderate for 5 to 5.9 and light below that. Destructive and damaging are descriptions of the effect on buildings and are not the class assigned to magnitudes above 8, and major is the class just below great, so great is the answer. The scale is logarithmic: each whole number step means ten times more ground motion amplitude and about 32 times more energy released, so an earthquake above 8 is more than ten times larger in amplitude than a major one of magnitude 7, which is why it is given its own top class.

Please log in or register to report this question.

Discuss in Forum
53.

Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R).

Assertion (A) : It is difficult to judge how changes in localized gas samples represent more general conditions in the Volcano.
Reason (R) : The composition of the juvenile gases emitted from volcanic vents often show considerable variation over short periods and distances.
Choose the correct answer.

Exam Year(s)

UGC NET - 2012,

Answer: A

Both statements are true and the reason explains the assertion. The composition of the juvenile gases emitted from volcanic vents shows considerable variation over short periods of time and over short distances. For that reason it is difficult to judge how changes seen in a local gas sample reflect more general conditions in the volcano. Because the reason gives the cause of the difficulty described, option A is correct, and option B, which denies this link, is not.

Please log in or register to report this question.

Discuss in Forum
54.

Aquifers that extend continuously from the land surface through material of high permeability are

Exam Year(s)

UGC NET - 2012,

Answer: D

Unconfined aquifers extend continuously from the land surface down through permeable material, so water falls on the surface and moves directly to the water table, which is why such aquifers are the most exposed to pollution. Confined aquifers are overlain by a layer of low permeability. Aquitards are layers that transmit water slowly, and the aquiclude (printed Auicludes) is a layer so tight that it practically does not transmit water, so neither is a continuous permeable aquifer.

Please log in or register to report this question.

Discuss in Forum
55.

Maximum CaO is found in

Exam Year(s)

UGC NET - 2012,

Answer: C

Limestone is mainly calcium carbonate, which on heating yields calcium oxide, and it contains about 56 percent CaO when pure, far more than the other minerals listed. Bauxite is the ore of aluminium (hydrated aluminium oxide), limonite is a hydrated iron oxide and siderite is iron carbonate, so these three are rich in aluminium or iron and not in calcium. Limestone is therefore the one with the maximum CaO. Heated, limestone gives quicklime (CaO), the basis of the cement and lime industries.

Please log in or register to report this question.

Discuss in Forum
56.

The sequence of chemical constituents in order of their abundance in a majority of sedimentary rocks is

Exam Year(s)

UGC NET - 2012,

Answer: B

In a majority of sedimentary rocks, which are dominated by shales, silica is the most abundant constituent, followed by alumina, then iron oxide, and titanium oxide is a minor constituent. So the order is SiO2 greater than Al2O3 greater than Fe2O3 greater than TiO2. The first option puts TiO2 ahead of alumina and iron oxide, the third puts Fe2O3 above Al2O3 and the fourth puts TiO2 above Al2O3, which are not the observed abundances. The result reflects the dominance of quartz and clay minerals in sedimentary rocks, which are silica and aluminium rich.

Please log in or register to report this question.

Discuss in Forum
57.

Which bacteria removes copper from low grade copper ore ?

Exam Year(s)

UGC NET - 2012,

Answer: A

Thiobacillus (T. ferrooxidans) removes copper from low grade ore by bioleaching: it oxidises iron and sulphide minerals, turning insoluble copper sulphide into soluble copper sulphate that can be recovered. Bacillus thuringiensis is known for the Bt toxin used against insect pests, and Rhizobium fixes nitrogen in legume root nodules. As neither of these two leaches metal, 'all of the above' is wrong.

Please log in or register to report this question.

Discuss in Forum
58.

Largest amount of fresh water is present in

Exam Year(s)

UGC NET - 2012,

Answer: D

Most of the fresh water on Earth is locked in ice: polar ice sheets and glaciers hold about two thirds of all fresh water, and the polar ice sheets of Antarctica and Greenland contain the large majority of that ice. The keyed answer is therefore polar ice. Lakes hold only a very small fraction (a few tenths of one percent), and rivers hold a minute amount (about 0.006 percent), so neither is the largest store.

Please log in or register to report this question.

Discuss in Forum
59.

Percent of water on the world's surface representing fresh water is

Exam Year(s)

UGC NET - 2012,

Answer: D

Fresh water makes up about 3 percent of the water on the world's surface, option D. The oceans hold about 97 percent, and of the small remainder most is locked in ice caps and glaciers, so the water that is easily usable is a still smaller part.

Option A, 97, is the share of salt water in the oceans and is the reverse of the question. Options B and C, 50 and 10 percent, are far too large. The figure of about 3 percent is among the basic numbers to learn for questions on water resources.

Please log in or register to report this question.

Discuss in Forum
60.

Natural gas is composed primarily of

Exam Year(s)

UGC NET - 2012,

Answer: A

Natural gas is composed primarily of methane, option A. Methane commonly makes up the largest part of natural gas, with smaller amounts of ethane, propane and butane.

The n-butane (option B) is present only in small proportions and is a constituent of liquefied petroleum gas. The n-octane (option C) is a liquid hydrocarbon and a part of petrol. Option D, a mixture of n-octane and n-butane, is therefore not the composition of a gas. Methane is by far the main component.

Please log in or register to report this question.

Discuss in Forum
Loading…

Topics

Other Subjects

Tags: Natural Resources Questions and Answers || Natural Resources MCQ Questions and Answers || Natural Resources GK Questions and Answers || Natural Resources GK MCQ Questions || Natural Resources Multiple Choice Questions and Answers || Natural Resources GK || GK on Natural Resources || Environmental Science Questions and Answers || Environmental Science MCQ Questions and Answers || Environmental Science GK Questions and Answers || GK on Environmental Science

About Us

ExamsRepo

Copyright © 2026 ExamsRepo . All Rights Reserved . With