• INDIAN POLITY FOR CIVIL SERVICES EXAMINATIONS
  • Indian Culture for Prelims Preparation
  • Environment and Ecology
  • Economics
  • Geography
  • Science & Technology
  • Indian History
  • Current Affairs

Chemistry

  1. Metals and Nonmetals
  2. Coal and petroleum
  3. Synthetic Fibres and Plastics
  4. Combustion and Flame
  5. Nanotechnology
  6. Day to Day Chemistry
  • NCERT- Science- Class VIII- Chapters 3 to 6

[2011 Prelims]

1)In the Union Budget 2011-12, a full exemption from the basic customs duty was extended to the bio-based asphalt (bi0-asphalt). What is the importance of this material? 

1. Unlike traditional asphalt, bio-asphalt is not based on fossil fuels. 
2. Bioasphalt can be made from non- renewable resources. 
3. Bioasphalt can be made from organic waste materials. 
4. It is eco-friendly to use bioasphalt for surfacing of the roads. 

Which of the statements given above are correct?        
(a) 1, 2 and 3 only 
(b) 1, 3 and 4 only 
(c) 2 and 4 only 
(d) 1, 2, 3 and 4 

2) The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason ?

(a)    Ice is a bad conductor of heat.

(b)    Since the surface of the lake is at the same temperature as the air, no heat is lost.

(c)    The density of water is maximum at 4°c.

(d)    None of the statements (a), (b) and (c) given is correct.

[2012 Prelims]

1)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 these elements, has imposed some restrictions on their export.
  2. Other than China, Australia, Canada and Chile, these elements are not found in any country.
  3. Rare earth metals are essential for the manufacture of various kinds of electronic items and there is a growing demand for these elements.

Which of the statements given above is/are correct?

[A]1 Only

[B]2 & 3 Only

[C]1 & 3 Only

[D]1,2 & 3

2)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/are correct?

  1. Coconut shells, groundnut shells and rice husk can be used in biomass gasification.
  2. The combustible gases generated from biomass gasification consist of hydrogen and carbon dioxide only.
  3. The combustible gases generated from biomass gasification can be used for direct heat generation but not in internal combustion engines.

Select the correct answer using the codes given below:

[A]1 Only

[B]2 & 3 Only

[C]1 & 3 Only

[D]1,2 & 3


3)What is the role of ultraviolet (UV) radiation in the water purification systems?

  1. It inactivates/kills the harmful microorganisms in water.
  2. It removes all the undesirable odours from the water.
  3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water. Which of the statements given above is/are correct?

[A]1 Only

[B]2 & 3 Only

[C]1 & 3 Only

[D]1,2 & 3

4)Graphene is frequently in news recently. What is its importance?

  1. It is a two-dimensional material and has good electrical conductivity.
  2. It is one of the thinnest but strongest materials tested so far.
  3. It is entirely made of silicon and has high optical transparency.
  4. It can be used as ‘conducting electrodes’ required for touch screens, LEDs and organic LEDs. Which of the statements given above are correct?

[A]1 and 2 only

[B]3 and 4 only

[C]1, 2 and 4 only

[D]1,2,3 & 4

5)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 units
  2. Pens and pencils
  3. Paints
  4. Hair oils and cosmetics

Select the correct answer using the codes given below:

[A]1,2 & 3 only

[B]1 and 3 only

[C]2 & 4 only

[D]1,2,3 & 4

6)A team of scientists at Brookhaven National Laboratory including those from India created the heaviest anti-matter (anti-helium nucleus). What is/are the implication/ implications of the creation of anti-matter?

  1. It will make mineral prospecting and oil exploration easier and cheaper.
  2. It will help probe the possibility of the existence of stars and galaxies made of anti-matter.
  3. It will help understand the evolution of the universe.

Select the correct answer using the codes given below :

[A]1 Only

[B]2 & 3 only

[C]3 Only

[D]1,2 & 3.

[2013 Prelims]

1)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 Select the correct answer using the codes given below.

[A]1 and 2 only

[B]2 only

[C]1 and 3 only

[D]1, 2 and 3
2)Due to improper / indiscriminate disposal of old and used computers or their parts, which of the following are released into the environment as e-waste?

  1. Beryllium
  2. Cadmium
  3. Chromium
  4. Heptachlor
  5. Mercury
  6. Lead
  7. Plutonium

Select the correct answer using the codes given below.

[A]1, 3, 4, 6, and 7 only

[B]1, 2, 3, 5, and 6 only

[C]2, 4, 5 and 7 only

[D]1, 2, 3, 4, 5, 6, and 7
3)The efforts to detect the existence of Higgs boson particle have become frequent news in the recent past. What is/ are the importance/ importances of discovering this particle?

  1. It will enable us to under-stand as to why elementary particles have mass.
  2. It will enable us in the near future to develop the technology of transferring matter from one point to another without traversing the physical space between them.
  3. It will enable us to create better fuels for nuclear fission.

Select the correct answer using the codes given below.

[A]1 only

[B]2 and 3 only

[C]1 and 3 only

[D]1, 2 and 3

[2014 Prelims]

1)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 can accumulate in the environment, and contaminate water and soil.
  2. They can enter the food chains.
  3. They can trigger the production of free radicals.

Select the correct answer using the code given below.

(a) 1 and 2 only

(b) 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

2) Which of the following is/are the example/examples of chemical change?

  1. Crystallisation of sodium chloride
  2. Melting of ice
  3. Souring of milk

Select the correct answer using the code given below.

(a) 1 and 2 only

(b) 3 only

(c) 1, 2 and 3

(d) None

3)Brominated flame retardants are used in many household products like mattresses and upholstery. Why is there some concern about their use?

  1. They are highly resistant to degradation in the environment.
  2. They are able to accumulate in humans and animals.

Select the correct answer using the code given below.

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

[2015 Prelims]

1) 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 code given below:

(a) 1 and 2

(b) 2 only

(c) 1 and 3

(d) 3 only

2)With reference to the use of nanotechnology in sector, which of the following  statements is/are correct ?

  1. Targeted drug delivery is made possible by nanotechnology.
  2. Nanotechnology can largely contribute to gene therapy.

Select the correct answer using the code given below:

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

3)In the context of modern scientific research, consider the following statements about ‘IceCube’, a particle detector located at South Pole which was recently in the news:

  1. It is the world’s largest neutrinos detector, encompassing a cubic kilometre of ice.
  2. It is a powerful telescope to search for dark matter.
  3. It is buried deep in the ice.

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 and 3only

(c) 1 and 3 only

(d) 1, 2 and 3

4) With reference to bio-toilets used by the Indian Railways, consider the following statements:

  1. The decomposition of human waste in the bio-toilets is initiated by fungal inoculums.
  2. Ammonia and water vapour are the end products in this decomposition which are released into the atmosphere.

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

5)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 is used as a fuel, the fuel cell emits heat and water as by-products.
  2. Fuel cells can be used for powering buildings and not for small devices like laptop computers.
  3. Fuel cells produce electricity in the form of Alternating Current (AC).

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3