Science & Technology PYQs

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1. Prelims 2022Q99Biotechnology

   Consider the following statements :

   DNA Barcoding can be a tool to :

   1.assess the age of a plant or animal.

   2.distinguish among species that look alike.

   3.identify undesirable animal or plant materials in processed foods.

   Which of the statements given above is/are correct ?

   a1 onlyb3 onlyc1 and 2d2 and 3
2. Prelims 2021Q65Biotechnology

   With reference to recent developments regarding 'Recombinant Vector Vaccines', consider the following statements :

   1.Genetic engineering is applied in the development of these vaccines.

   2.Bacteria and viruses are used as vectors.

   Which of the statements given above is/are correct?

   a1 onlyb2 onlycBoth 1 and 2dNeither 1 nor 2
3. Prelims 2021Q66Biotechnology

   In the context of hereditary diseases, consider the following statements :

   1.Passing on mitochondrial diseases from parent to child can be prevented by mitochondrial replacement therapy either before or after in vitro fertilization of egg.

   2.A child inherits mitochondrial diseases entirely from mother and not from father.

   Which of the statements given above is/are correct?

   a1 onlyb2 onlycBoth 1 and 2dNeither 1 nor 2
4. Prelims 2021Q67Biotechnology

   Bollgard I and Bollgard II technologies are mentioned in the context of

   aclonal propagation of crop plantsbdeveloping genetically modified crop plantscproduction of plant growth substancesdproduction of biofertilizers
5. Prelims 2021Q68Physics

   In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?

   1.Area of the hole in the lid

   2.Temperature of the flame

   3.Weight of the lid

   Select the correct answer using the code given below.

   a1 and 2 onlyb2 and 3 onlyc1 and 3 onlyd1, 2 and 3
6. Prelims 2021Q69Biology & Human Body

   Consider the following :

   1.Bacteria

   2.Fungi

   3.Virus

   Which of the above can be cultured in artificial/synthetic medium?

   a1 and 2 onlyb2 and 3 onlyc1 and 3 onlyd1, 2 and 3
7. Prelims 2021Q70Health & Diseases

   Consider the following statements :

   1.Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes.

   2.Common cold is sometime caused by an adenovirus whereas AIDS is caused by a retrovirus.

   Which of the statements given above is/are correct?

   a1 onlyb2 onlycBoth 1 and 2dNeither 1 nor 2
8. Prelims 2021Q71Chemistry

   Water can dissolve more substances than any other liquid because

   ait is dipolar in naturebit is a good conductor of heatcit has high value of specific heatdit is an oxide of hydrogen
9. Prelims 2021Q72Physics

   With reference to street-lighting, how do sodium lamps differ from LED lamps?

   1.Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.

   2.As street-lights, sodium lamps have longer life span than LED lamps.

   3.The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting.

   Select the correct answer using the code given below.

   a3 onlyb2 onlyc1 and 3 onlyd1, 2 and 3
10. Prelims 2021Q73Health & Diseases

    The term 'ACE2' is talked about in the context of

    agenes introduced in the genetically modified plantsbdevelopment of India's own satellite navigation systemcradio collars for wildlife trackingdspread of viral diseases
11. Prelims 2021Q74Chemistry

    Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?

    aLow-density polyethylenebPolycarbonatecPolyethylene terephthalatedPolyvinyl chloride
12. Prelims 2021Q75Chemistry

    'Triclosan', considered harmful when exposed to high levels for a long time, is most likely present in which of the following?

    aFood preservativesbFruit-ripening substancescReused plastic containersdToiletries
13. Prelims 2021Q76Space Technology

    Which one of the following is a reason why astronomical distances are measured in light-years?

    aDistances among stellar bodies do not change.bGravity of stellar bodies does not change.cLight always travels in straight line.dSpeed of light is always same.
14. Prelims 2020Q37Biotechnology

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

    afertilization of egg in vitro by the donor spermbgenetic modification of sperm producing cellscdevelopment of stem cells into functional embryosdprevention of mitochondrial diseases in offspring
15. Prelims 2020Q38Emerging Technologies

    With the present state of development, Artificial Intelligence can effectively do which of the following ?

    1.Bring down electricity consumption in industrial units

    2.Create meaningful short stories and songs

    3.Disease diagnosis

    4.Text-to-Speech Conversion

    5.Wireless transmission of electrical energy

    Select the correct answer using the code given below :

    a1, 2, 3 and 5 onlyb1, 3 and 4 onlyc2, 4 and 5 onlyd1, 2, 3, 4 and 5
16. Prelims 2020Q39IT & Communication

    With reference to Visible Light Communication (VLC) technology, which of the following statements are correct ?

    1.VLC uses electromagnetic spectrum wavelengths 375 to 780 nm.

    2.VLC is known as long-range optical wireless communication.

    3.VLC can transmit large amounts of data faster than Bluetooth.

    4.VLC has no electromagnetic interference.

    Select the correct answer using the code given below :

    a1, 2 and 3 onlyb1, 2 and 4 onlyc1, 3 and 4 onlyd2, 3 and 4 only
17. Prelims 2020Q40Emerging Technologies

    With reference to “Blockchain Technology”, consider the following statements :

    1.It is a public ledger that everyone can inspect, but which no single user controls.

    2.The structure and design of blockchain is such that all the data in it are about cryptocurrency only.

    3.Applications that depend on basic features of blockchain can be developed without anybody’s permission.

    Which of the statements given above is/are correct ?

    a1 onlyb1 and 2 onlyc2 onlyd1 and 3 only
18. Prelims 2020Q41Emerging TechnologiesAnswer disputed

    With reference to carbon nanotubes, consider the following statements :

    1.They can be used as carriers of drugs and antigens in the human body.

    2.They can be made into artificial blood capillaries for an injured part of human body.

    3.They can be used in biochemical sensors.

    4.Carbon nanotubes are biodegradable.

    Which of the statements given above are correct ?

    a1 and 2 onlyb2, 3 and 4 onlyc1, 3 and 4 onlyd1, 2, 3 and 4
19. Prelims 2020Q42Emerging Technologies

    Consider the following activities :

    1.Spraying pesticides on a crop field

    2.Inspecting the craters of active volcanoes

    3.Collecting breath samples from spouting whales for DNA analysis At the present level of technology, which of the above activities can be successfully carried out by using drones ?

    a1 and 2 onlyb2 and 3 onlyc1 and 3 onlyd1, 2 and 3
20. Prelims 2020Q43Space Technology

    “The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long, with lasers shining between the craft.” The experiment in question refers to

    aVoyager-2bNew HorizonscLISA PathfinderdEvolved LISA