Q173. With reference to ‘fly ash’ produced by the power plants using coal as fuel, which of the following statements is/are correct? 1. Fly ash can be used in the production of bricks for building construction. 2. Fly ash can be used as a replacement for some of the Portland cement contents of concrete. 3. Fly ash is made up of silicon dioxide and calcium oxide only, and does not contain any toxic elements. Select the correct answer using the codes given below.

Consider the following statements: 1. Coal ash contains arsenic, lead and mercury. 2. Coal-fired power plants release sulphur dioxide and oxides of nitrogen int

Steel slag can be the material for which of the following? 1. Construction of base road 2. Improvement of agricultural soil 3. Production of cement Select the

Consider the following: 1. Carbon dioxide 2. Oxides of Nitrogen 3. Oxides of Sulphur Which of the above is/are the emission/emissions from coal combustion at th

Which of the following is/are the characteristic/characteristics of Indian coal ? 1. High ash content 2. Low sulphur content 3. Low ash fusion temperature Sele

With reference to the usefulness of the byproducts of the sugar industry, which of the following statements is/are correct? 1. Bagasse can be used as biomass fu

With reference to furnace oil, consider the following statements: 1. It is a product of oil refineries. 2. Some industries use it to generate power. 3. Its use

There is some concern regarding the nanoparticles of some chemical elements that are used by the industry in the manufacture of various products. Why? 1. They c

Why is there a concern about copper smelting plants? 1. They may release lethal quantities of carbon monoxide into the environment. 2. The copper slag can cause

Biomass gasification is considered to be one of the sustainable solutions to the power crisis in India. In this context, which of the following statements is/ar

Despite having large reserves of coal, why does India import millions of tons of coal? 1. It is the policy of India to save its own coal reserves for the future

Which of the following adds nitrogen to the soil? (2013) 1. Excretion of urea by animals 2. Burning of coal by man 3. Death of vegetation Select the correct ans

Consider the following statements: 1. Agricultural soils release nitrogen oxides into the environment. 2. Cattle release ammonia into the environment. 3. Poultr

What is the use of biochar in farming? 1. Biochar can be used as a part of the growing medium in vertical farming. 2. When biochar is a part of the growing medi

Consider the following statements: 1. Other than those made by humans, nanoparticles do not exist in nature. 2. Nanoparticles of some metallic oxides are used i

In the context of mitigating the impending global warming due to anthropogenic emissions of carbon dioxide, which of the following can be potential sites for ca

In the context of solving pollution problems, what is/are the advantage/advantages of bioremediation techniques? 1. It is a technique for cleaning up pollution

Graphene has been frequently in the news recently. What is its importance? 1. It is a two-dimensional material and has good electrical conductivity. 2. It is on

With reference to coal-based thermal power plants in India, consider the following statements: 1. None of them uses seawater. 2. None of them are set up in wate

With reference to ‘stem cells’, frequently in the news, which of the following statements is/are correct? 1. Stem cells can be derived from mammals only. 2. Ste

Consider the following statements regarding mercury pollution: (a) Gold mining activity is a source of mercury pollution in the world. (b) Coal-based thermal p

Consider the following statements: 1. Molasses is a by-product of the sugar production process. 2. Bagasse obtained in the sugar mills is used as a fuel in the

With reference to agricultural soils, consider the following statements: 1. A high content of organic matter in soil drastically reduces its water holding capa

In the Union Budget 2011-12, a full exemption from the basic customs duty was extended to the bio-based asphalt (bioasphalt). What is the importance of this mat

With reference to ‘fuel cells’ in which hydrogen-rich fuel and oxygen are used to generate electricity, consider the following statements: 1. If pure hydrogen i

With reference to Neem tree, consider the following statements: 1. Neem oil can be used as a pesticide to control the proliferation of some species of insects a

Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned, what still are the sources of lead poisoning? 1. Smelting u

Consider the following statements: The nation-wide ‘Soil Health Card Scheme’ aims at: 1. Expanding the cultivable area under irrigation. 2. Enabling the banks t

Consider the following statements: 1. Baking soda is used in fire extinguishers. 2. Quick lime is used in the manufacture of glass. 3. Gypsum is used in the man

In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint? 1. Copper sl

With reference to perfluoroalkyl and polyfluoroalkyl substances (PFAS) that are used in making many consumer products, consider the following statements: 1. PF

What is/are the advantage/ advantages of zero tillage in agriculture? 1. Sowing of wheat is possible without burning the residue of the previous crop. 2. Withou

Consider the following statements: The satellite Oceansat-2 launched by India helps in 1. estimating the water vapour content in the atmosphere. 2. predicting t

With reference to the management of minor minerals in India, consider the following statements: 1. Sand is a ‘minor mineral’ according to the prevailing law in

In the context of proposals to the use of hydrogen-enriched CNG (H-CNG) as fuel for buses in public transport, consider the following statements: 1. The main ad

Consider the following: 1. Oxides of Hydrogen 2. Oxides of Nitrogen 3. Oxides of Sulphur Which of the above causes/cause acid rain?

Recently, there has been a concern over the short supply of a group of elements called ‘rare earth metals’. Why? 1. China, which is the largest producer of thes

With the present state of development, Artificial Intelligence can effectively do which of the following? 1. Bring down electricity consumption in ind

With reference to Visible Light Communication (VLC) technology, which of the following statements are correct? 1. VLC uses electromagnetic spectrum wa

In India, under cyber insurance for individuals, which of the following benefits are generally covered, in addition to payment for the loss of funds a

With reference to “Blockchain Technology” consider the following statements: 1. It is a public ledger that everyone can inspect but which no single us

Which of the following statements are correct regarding the general difference between plant and animal cells? 1. Plant cells have cellulose cell wall

In the context of recent advances in human reproductive technology. “Pronuclear Transfer” is used for

With reference to solar water pumps, consider the following statements: 1. Solar power can be used for running surface pumps and not for submersible p

With reference to the current trends in the cultivation of sugarcane in India, consider the following statements: 1. A substantial saving in seed mate