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Science & Technology

923 questions asked in UPSC Prelims.

2018 · Q95Science & TechnologySpace Technology & Astronomymoderate

With reference to India's satellite launch vehicles, consider the following statements : 1. PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites. 2. Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth. 3. GSLV Mk III is a four-staged launch vehicle with the first and third stages using solid rocket motors; and the second and fourth stages using liquid rocket engines. Which of the statements given above is/are correct ?

  1. (a)1 only
  2. (b)2 and 3
  3. (c)1 and 2
  4. (d)3 only
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Official answer(a) 1 only

2017 · Q22Science & TechnologyEnergy & Environmentmoderate

It is possible to produce algae based biofuels, but what is/are the likely limitation(s) of developing countries in promoting this industry ? 1. Production of algae based biofuels is possible in seas only and not on continents. 2. Setting up and engineering the algae based biofuel production requires high level of expertise/technology until the construction is completed. 3. Economically viable production necessitates the setting up of large scale facilities which may raise ecological and social concerns. Select the correct answer using the code given below :

  1. (a)1 and 2 only
  2. (b)2 and 3 only
  3. (c)3 only
  4. (d)1, 2 and 3
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Official answer(b) 2 and 3 only

2017 · Q45Science & TechnologyBiotechnology & Geneticsmoderate

With reference to agriculture in India, how can the technique of 'genome sequencing', often seen in the news, be used in the immediate future ? 1. Genome sequencing can be used to identify genetic markers for disease resistance and drought tolerance in various crop plants. 2. This technique helps in reducing the time required to develop new varieties of crop plants. 3. It can be used to decipher the host-pathogen relationships in crops. Select the correct answer using the code given below :

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)1 and 3 only
  4. (d)1, 2 and 3
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Official answer(d) 1, 2 and 3

2017 · Q74Science & TechnologyComputer & Information Technologyeasy

Organic Light Emitting Diodes (OLEDs) are used to create digital display in many devices. What are the advantages of OLED displays over Liquid Crystal displays ? 1. OLED displays can be fabricated on flexible plastic substrates. 2. Roll-up displays embedded in clothing can be made using OLEDs. 3. Transparent displays are possible using OLEDs. Select the correct answer using the code given below :

  1. (a)1 and 3 only
  2. (b)2 only
  3. (c)1, 2 and 3
  4. (d)None of the above statements is correct
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Official answer(c) 1, 2 and 3

2016 · Q34Science & TechnologyHealth & Diseasesmoderate

With reference to pre-packaged items in India, it is mandatory to the manufacturer to put which of the following information on the main label, as per the Food Safety and Standards (Packaging and Labelling) Regulations, 2011? 1. List of ingredients including additives 2. Nutrition information 3. Recommendations, if any, made by the medical profession about the possibility of any allergic reactions 4. Vegetarian/non-vegetarian Select the correct answer using the code given below.

  1. (a)1, 2 and 3
  2. (b)2, 3 and 4
  3. (c)1, 2 and 4
  4. (d)1 and 4 only
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Official answer(c) 1, 2 and 4

2016 · Q66Science & TechnologyComputer & Information Technologymoderate

With reference to 'Bitcoins', sometimes seen in the news, which of the following statements is/are correct? 1. Bitcoins are tracked by the Central Banks of the countries. 2. Anyone with a Bitcoin address can send and receive Bitcoins from anyone else with a Bitcoin address. 3. Online payments can be sent without either side knowing the identity of the other. Select the correct answer using the code given below.

  1. (a)1 and 2 only
  2. (b)2 and 3 only
  3. (c)3 only
  4. (d)1, 2 and 3
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Official answer(b) 2 and 3 only

2016 · Q79Science & TechnologyEnergy & Environmenteasy

India is an important member of the 'International Thermonuclear Experimental Reactor'. If this experiment succeeds, what is the immediate advantage for India?

  1. (a)It can use thorium in place of uranium for power generation
  2. (b)It can attain a global role in satellite navigation
  3. (c)It can drastically improve the efficiency of its fission reactors in power generation
  4. (d)It can build fusion reactors for power generation
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Official answer(d) It can build fusion reactors for power generation

2016 · Q84Science & TechnologyComputer & Information Technologyeasy

Regarding 'DigiLocker', sometimes seen in the news, which of the following statements is/are correct? 1. It is a digital locker system offered by the Government under Digital India Programme. 2. It allows you to access your e-documents irrespective of your physical location. Select the correct answer using the code given below.

  1. (a)1 only
  2. (b)2 only
  3. (c)Both 1 and 2
  4. (d)Neither 1 nor 2
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Official answer(c) Both 1 and 2

2016 · Q87Science & TechnologySpace Technology & Astronomymoderate

With reference to 'Astrosat', the astronomical observatory launched by India, which of the following statements is/are correct? 1. Other than USA and Russia, India is the only country to have launched a similar observatory into space. 2. Astrosat is a 2000 kg satellite placed in an orbit at 1650 km above the surface of the Earth. Select the correct answer using the code given below.

  1. (a)1 only
  2. (b)2 only
  3. (c)Both 1 and 2
  4. (d)Neither 1 nor 2
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Official answer(d) Neither 1 nor 2