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Science & Technology Previous Year Questions (PYQ) with Answers – Page 6

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Science & Technology questions asked in previous year papers of SSC, Banking, Railway and other exams, with the exam and year, answers and explanations.

128 previous-year questions

All Science & Technology questionsScience & Technology NotesPYQs by exam
Q101.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2018, GS Paper IEasy

In which of the following areas can GPS technology be used ? 1. Mobile phone operations 2. Banking operations 3. Controlling the power grids 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
Show answer
Correct answer: D. 1, 2 and 3

Besides location, GPS satellites broadcast extremely precise time, and mobile networks, banks and power grids all depend on that timing.

Q102.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2018, GS Paper IEasy

What is "Terminal High Altitude Area Defense (THAAD)", sometimes seen in the news ?

  1. A.An Israeli radar system
  2. B.India's indigenous anti-missile programme
  3. C.An American anti-missile system
  4. D.A defence collaboration between Japan and South Korea
Show answer
Correct answer: C. An American anti-missile system

THAAD is a United States ballistic missile defence system built to shoot down missiles in the last stage of their flight.

Q103.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2018, GS Paper IHard

In the Indian context, what is the implication of ratifying the 'Additional Protocol' with the International Atomic Energy Agency (IAEA) ?

  1. A.The civilian nuclear reactors come under IAEA safeguards.
  2. B.The military nuclear installations come under the inspection of IAEA.
  3. C.The country will have the privilege to buy uranium from the Nuclear Suppliers Group (NSG).
  4. D.The country automatically becomes a member of the NSG.
Show answer
Correct answer: A. The civilian nuclear reactors come under IAEA safeguards.

For India, the Additional Protocol strengthens IAEA oversight of the civilian nuclear facilities India has chosen to place under safeguards; its military programme stays outside.

Q104.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2018, GS Paper IMedium

The identity platform 'Aadhaar' provides open "Application Programming Interfaces (APIs)". What does it imply?

1. It can be integrated into any electronic device.

2. Online authentication using iris is possible.

Which of the statements given above is/are correct?

  1. A.1 only
  2. B.2 only
  3. C.Both 1 and 2
  4. D.Neither 1 nor 2
Show answer
Correct answer: C. Both 1 and 2

Open APIs let any device or application connect to Aadhaar's authentication service, and that service accepts iris scans as well as fingerprints, OTP and demographic data.

Q105.Science & TechnologyAsked in: Rajasthan · 16 Sept 2018Easy

Which of the following branches of botany deals with the development of improved plant varieties?

  1. A.Plant embryology
  2. B.Plant breeding
  3. C.Plant biochemistry
  4. D.Plant anatomy
Show answer
Correct answer: B. Plant breeding

Plant breeding is the deliberate improvement of crops by choosing parents with desirable characters, crossing them, selecting among the progeny and multiplying the best lines; the high yielding wheat and rice varieties of the Green Revolution came from it, and modern breeding is often combined with tissue culture and marker…

Q106.Science & TechnologyAsked in: CDS · CDS-I 2017, GKEasy

Hindustan Aeronautics Limited handed over the first two indigenously designed and manufactured light combat aircrafts to the Indian Air Force in 2016. What is the name of these new combat aircrafts?

  1. A.Marut
  2. B.Garud
  3. C.Tejas
  4. D.Pushpak
Show answer
Correct answer: C. Tejas

Tejas is India's indigenous Light Combat Aircraft, and the first two were handed over to the Indian Air Force on 1 July 2016 to form No. 45 Squadron, the Flying Daggers.

Q107.Science & TechnologyAsked in: CDS · CDS-I 2017, GKMedium

Which of the following statements about Bitcoin is/are correct? 1. It is a decentralized virtual currency. 2. It is generated through complex computer software systems. 3. The Reserve Bank of India recognized it as a legal tender in January 2016. Select the correct answer using the code given below.

  1. A.1 only
  2. B.1 and 2 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: B. 1 and 2 only

Bitcoin is a decentralised digital currency created by computer software, but the Reserve Bank of India has never made it legal tender.

Q108.Science & TechnologyAsked in: CDS · CDS-II 2017, GKEasy

Which one of the following planets was explored by Cassini Mission launched by NASA, which ended in September 2017?

  1. A.Sun
  2. B.Neptune
  3. C.Saturn
  4. D.Jupiter
Show answer
Correct answer: C. Saturn

The Cassini-Huygens mission was a joint project of NASA, the European Space Agency and the Italian Space Agency. Launched in October 1997, it reached Saturn in 2004 and studied the planet, its rings and its moons for thirteen years.

Q109.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2017, GS Paper IMedium

What is the purpose of 'evolved Laser Interferometer Space Antenna (eLISA)' project ?

  1. A.To detect neutrinos
  2. B.To detect gravitational waves
  3. C.To detect the effectiveness of missile defence system
  4. D.To study the effect of solar flares on our communication systems
Show answer
Correct answer: B. To detect gravitational waves

eLISA is a planned space observatory of the European Space Agency that will use laser interferometry between spacecraft to catch gravitational waves.

Q110.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2017, GS Paper IHard

In India, it is legally mandatory for which of the following to report on cyber security incidents? 1. Service providers 2. Data centres 3. Body corporate Select the correct answer using the code given below:

  1. A.1 only
  2. B.1 and 2 only
  3. C.3 only
  4. D.1, 2 and 3
Show answer
Correct answer: D. 1, 2 and 3

All three are legally bound to report cyber security incidents to CERT-In, the Indian Computer Emergency Response Team. CERT-In works under Section 70B of the Information Technology Act, 2000 as the national agency for incident response.

Q111.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2017, GS Paper IEasy

What is the application of Somatic Cell Nuclear Transfer Technology ?

  1. A.Production of biolarvicides
  2. B.Manufacture of biodegradable plastics
  3. C.Reproductive cloning of animals
  4. D.Production of organisms free of diseases
Show answer
Correct answer: C. Reproductive cloning of animals

Somatic cell nuclear transfer, or SCNT, is the technique used to clone an animal. Scientists take an egg cell and remove its nucleus.

Q112.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2017, GS Paper IEasy

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
Show answer
Correct answer: C. 1, 2 and 3

All three are real advantages of OLEDs, and they follow from the fact that each OLED pixel makes its own light.

Q113.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2017, GS Paper IMedium

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
Show answer
Correct answer: D. 1, 2 and 3

Genome sequencing helps find useful genes, speeds up breeding and shows how pathogens attack crops. Genome sequencing reads the complete order of bases in an organism's DNA.

Q114.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2017, GS Paper IHard

With reference to 'Quality Council of India (QCI)', consider the following statements:

1. QCI was set up jointly by the Government of India and the Indian Industry.

2. Chairman of QCI is appointed by the Prime Minister on the recommendations of the industry to the Government.

Which of the above statements is/are correct?

  1. A.1 only
  2. B.2 only
  3. C.Both 1 and 2
  4. D.Neither 1 nor 2
Show answer
Correct answer: C. Both 1 and 2

QCI is a joint body of the government and industry, and its chairperson is appointed by the Prime Minister on the industry's recommendation.

Q115.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2017, GS Paper IEasy

Consider the following statements : 1. The Standard Mark of Bureau of Indian Standards (BIS) is mandatory for automotive tyres and tubes. 2. AGMARK is a quality Certification Mark issued by the Food and Agriculture Organisation (FAO). Which of the statements given above is/are correct ?

  1. A.1 only
  2. B.2 only
  3. C.Both 1 and 2
  4. D.Neither 1 nor 2
Show answer
Correct answer: A. 1 only

Tyres and tubes must carry the BIS mark, but AGMARK is an Indian government mark, not an FAO one. The Bureau of Indian Standards, set up under the BIS Act (now the BIS Act, 2016), runs the ISI mark scheme.

Q116.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2017, GS Paper IMedium

Consider the following statements : 1. The Nuclear Security Summits are periodically held under the aegis of the United Nations. 2. The International Panel on Fissile Materials is an organ of International Atomic Energy Agency. Which of the statements given above is/are correct?

  1. A.1 only
  2. B.2 only
  3. C.Both 1 and 2
  4. D.Neither 1 nor 2
Show answer
Correct answer: D. Neither 1 nor 2

The Nuclear Security Summits were a United States initiative outside the UN, and the International Panel on Fissile Materials is an independent expert group, not part of the IAEA.

Q117.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2017, GS Paper IMedium

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
Show answer
Correct answer: B. 2 and 3 only

The real hurdles are the high technology needed to build algae plants and the very large scale they need to pay off; algae can be grown on land.

Q118.Science & TechnologyAsked in: NDA · 23 Apr 2017Hard

If the potential difference applied to an X-ray tube is doubled while keeping the separation between the filament and the target the same, what will happen to the cutoff wavelength?

  1. A.It will remain the same
  2. B.It will be doubled
  3. C.It will be halved
  4. D.It will be four times the original wavelength
Show answer
Correct answer: C. It will be halved

The cutoff or minimum wavelength of the continuous X-ray spectrum arises when an electron gives up its entire kinetic energy in a single collision with the target.

Q120.Science & TechnologyAsked in: CDS · CDS-II 2016, GKMedium

Which one of the following statements is not correct?

  1. A.BrahMos is a supersonic cruise missile made by India and Russian Federation.
  2. B.The name BrahMos came from two rivers, Brahmaputra of India and Moskva of Russia.
  3. C.Indian military scientists were capable of integrating BrahMos cruise missile with Sukhoi-30 MKI fighter.
  4. D.Defence Research and Development Organization is the manufacturer of Sukhoi-30 MKI fighter.
Show answer
Correct answer: D. Defence Research and Development Organization is the manufacturer of Sukhoi-30 MKI fighter.

The Sukhoi-30 MKI is not made by DRDO; it was designed by Russia's Sukhoi bureau and is built in India under licence by Hindustan Aeronautics Limited (HAL) at Nashik.