Science & Technology PYQs

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1. Prelims 2013Q88Physics

   Ball bearings are used in bicycles, cars, etc., because

   athe actual area of contact between the wheel and axle is increasedbthe effective area of contact between the wheel and axle is increasedcthe effective area of contact between the wheel and axle is reduceddNone of the above statements is correct
2. Prelims 2013Q89Physics

   Consider the following phenomena:

   1.Size of the sun at dusk

   2.Colour of the sun at dawn

   3.Moon being visible at dawn

   4.Twinkle of stars in the sky

   5.Polestar being visible in the sky

   Which of the above are optical illusions?

   a1, 2 and 3b3, 4 and 5c1, 2 and 4d2, 3 and 5
3. Prelims 2013Q90Physics

   Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this?

   1.Dispersion

   2.Refraction

   3.Internal reflection

   Select the correct answer using the codes given below.

   a1 and 2 onlyb2 and 3 onlyc1 and 3 onlyd1, 2 and 3
4. Prelims 2013Q91Biology & Human Body

   Many transplanted seedlings do not grow because

   athe new soil does not contain favourable mineralsbmost of the root hairs grip the new soil too hardcmost of the root hairs are lost during transplantationdleaves get damaged during transplantation
5. Prelims 2013Q93Biology & Human Body

   Which of the following statements is/are correct?

   1.Viruses lack enzymes necessary for the generation of energy.

   2.Viruses can be cultured in any synthetic medium.

   3.Viruses are transmitted from one organism to another by biological vectors only.

   Select the correct answer using the codes given below.

   a1 onlyb2 and 3 onlyc1 and 3 onlyd1, 2 and 3
6. Prelims 2013Q94Biology & Human Body

   Which of the following leaf modifications occurs/occur in desert areas to inhibit water loss?

   1.Hard and waxy leaves

   2.Tiny leaves or no leaves

   3.Thorns instead of leaves

   Select the correct answer using the codes given below.

   a1 and 2 onlyb2 onlyc1 and 3 onlyd1, 2 and 3
7. Prelims 2013Q95Physics

   The known forces of nature can be divided into four classes, viz., gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct?

   aGravity is the strongest of the fourbElectromagnetism acts only on particles with an electric chargecWeak nuclear force causes radioactivitydStrong nuclear force holds protons and neutrons inside the nucleus of an atom
8. Prelims 2013Q96Physics

   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 understand 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.

   a1 onlyb2 and 3 onlyc1 and 3 onlyd1, 2 and 3
9. Prelims 2012Q13Physics

   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?

   a1 onlyb2 and 3 onlyc1 and 3 onlyd1, 2 and 3
10. Prelims 2012Q14Emerging Technologies

    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, LCDs and organic LEDs.

    Which of the statements given above are correct?

    a1 and 2 onlyb3 and 4 onlyc1, 2 and 4 onlyd1, 2, 3 and 4
11. Prelims 2012Q16Biotechnology

    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.Stem cells can be used for screening new drugs.

    3.Stem cells can be used for medical therapies.

    Select the correct answer using the codes given below :

    a1 and 2 onlyb2 and 3 onlyc3 onlyd1, 2 and 3
12. Prelims 2012Q18Physics

    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 :

    a1 onlyb2 and 3 onlyc3 onlyd1, 2 and 3
13. Prelims 2012Q19Space TechnologyAnswer disputed

    Which of the following is/are cited by the scientists as evidence/evidences for the continued expansion of universe?

    1.Detection of microwaves in space

    2.Observation of redshift phenomenon in space

    3.Movement of asteroids in space

    4.Occurrence of supernova explosions in space

    Select the correct answer using the codes given below :

    a1 and 2b2 onlyc1, 3 and 4dNone of the above can be cited as evidence
14. Prelims 2012Q61Defence & Nuclear Technology

    To meet its rapidly growing energy demand, some opine that India should pursue research and development on thorium as the future fuel of nuclear energy. In this context, what advantage does thorium hold over uranium?

    1.Thorium is far more abundant in nature than uranium.

    2.On the basis of per unit mass of mined mineral, thorium can generate more energy compared to natural uranium.

    3.Thorium produces less harmful waste compared to uranium.

    Which of the statements given above is/are correct?

    a1 onlyb2 and 3 onlyc1 and 3 onlyd1, 2 and 3
15. Prelims 2012Q63Biology & Human Body

    Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

    aHydrogen, Oxygen, SodiumbCarbon, Hydrogen, NitrogencOxygen, Calcium, PhosphorusdCarbon, Hydrogen, Potassium
16. Prelims 2012Q64Biotechnology

    What are the reasons for the people's resistance to the introduction of Bt brinjal in India?

    1.Bt brinjal has been created by inserting a gene from a soil fungus into its genome.

    2.The seeds of Bt brinjal are terminator seeds and therefore, the farmers have to buy the seeds before every season from the seed companies.

    3.There is an apprehension that the consumption of Bt brinjal may have adverse impact on health.

    4.There is some concern that the introduction of Bt brinjal may have adverse effect on the biodiversity.

    Select the correct answer using the codes given below :

    a1, 2 and 3 onlyb2 and 3 onlyc3 and 4 onlyd1, 2, 3 and 4
17. Prelims 2012Q65Biotechnology

    Other than resistance to pests, what are the prospects for which genetically engineered plants have been created?

    1.To enable them to withstand drought

    2.To increase the nutritive value of the produce

    3.To enable them to grow and do photosynthesis in spaceships and space stations

    4.To increase their shelf life

    Select the correct answer using the codes given below :

    a1 and 2 onlyb3 and 4 onlyc1, 2 and 4 onlyd1, 2, 3 and 4
18. Prelims 2012Q93Physics

    Consider the following statements :

    If there were no phenomenon of capillarity

    1.it would be difficult to use a kerosene lamp

    2.one would not be able to use a straw to consume a soft drink

    3.the blotting paper would fail to function

    4.the big trees that we see around would not have grown on the Earth

    Which of the statements given above are correct?

    a1, 2 and 3 onlyb1, 3 and 4 onlyc2 and 4 onlyd1, 2, 3 and 4
19. Prelims 2011Q3Space Technology

    Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when:

    1.The orbit is geosynchronous.

    2.The orbit is circular.

    3.The orbit lies in the plane of the Earth’s equator.

    4.The orbit is at an altitude of 22,236 km.

    Select the correct answer using the codes given below:

    a1, 2 and 3 onlyb1, 3 and 4 onlyc2 and 4 onlyd1, 2, 3 and 4
20. Prelims 2011Q5Biotechnology

    At present, scientists can determine the arrangement or relative positions of genes or DNA sequences on a chromosome. How does this knowledge benefit us?

    1.It is possible to know the pedigree of livestock.

    2.It is possible to understand the causes of all human diseases.

    3.It is possible to develop disease-resistant animal breeds.

    Which of the statements given above is/are correct?

    a1 and 2 onlyb2 onlyc1 and 3 onlyd1, 2 and 3