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Science & TechnologyEasyAsked in: NDA · NDA-II 2025, GAT

Ethereum, Tether, Solana and Cardano are all forms of

  1. A.Crypto currency
  2. B.Artificial Intelligence(AI) Startups
  3. C.Humanoid Robots
  4. D.Medical apps

Correct answer

A. Crypto currency

Explanation

The correct answer is A, Crypto currency. Ethereum, Tether, Solana and Cardano are all cryptocurrencies, digital assets recorded on blockchains rather than issued by a central bank.

A blockchain is a shared, tamper-resistant ledger kept by many computers, which records who owns which coins. Ethereum, launched in 2015 and co-founded by Vitalik Buterin, has the coin ether and supports smart contracts. Tether (USDT) is a stablecoin whose value is kept pegged to the US dollar. Solana is known for fast, low-cost transactions, and Cardano, whose coin is ADA, was founded by Charles Hoskinson. Bitcoin, created in 2009 under the name Satoshi Nakamoto, was the first cryptocurrency. In India, private cryptocurrencies are not legal tender, and the RBI's own digital rupee is a separate central bank digital currency.

B is wrong: these are not AI start-ups, though some AI firms build on blockchains. C is wrong: humanoid robots are machines such as Sophia; none of these names refers to one. D is wrong: they are not medical or health applications.

Exam tip: First cryptocurrency Bitcoin (2009); Ethereum = smart contracts (ether); Tether = USD stablecoin; Cardano = ADA.

Practice Questions

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Q1.Science & TechnologyAsked in: CDS · CDS-II 2022, GKMedium

Chronologically arrange the following Indian-origin astronauts on the basis of their flying into space starting with the first: 1. Sunita Williams 2. Rakesh Sharma 3. Sirisha Bandla 4. Kalpana Chawla Select the correct answer using the code given below:

  1. A.4-3-2-1
  2. B.2-4-1-3
  3. C.2-1-4-3
  4. D.1-4-3-2
Show answer
Correct answer: B. 2-4-1-3

Rakesh Sharma flew in 1984, Kalpana Chawla in 1997, Sunita Williams in 2006 and Sirisha Bandla in 2021. Squadron Leader Rakesh Sharma became the first Indian citizen in space on 3 April 1984, aboard the Soviet Soyuz T-11, and told Indira Gandhi that India looked 'saare jahan se achha'.

Q3.Science & TechnologyAsked in: NDA · NDA-I 2026, GATMedium

With reference to defence cooperation between India and Russia, which of the following statements is/are correct?

I. BrahMos Cruise Missile system is jointly developed by India's DRDO and Russia's NPO Mashinostroyeniya (NPOM).

II. The production site of the Indo-Russia Rifles Private Limited (IRRPL) joint venture is in Korwa, Madhya Pradesh under the 'Atmanirbhar Bharat' initiative.

Select the answer using the code given below.

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

BrahMos is indeed a joint DRDO-NPOM missile, but the IRRPL factory at Korwa is in Uttar Pradesh, not Madhya Pradesh.

Q4.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.

Q5.Science & TechnologyAsked in: CDS · CDS-II 2021, GKMedium

What is the range capability of Agni-P Ballistic Missile?

  1. A.1,000 - 2,000 km
  2. B.2,000 - 3,000 km
  3. C.3,000 - 4,000 km
  4. D.4,000 - 5,000 km
Show answer
Correct answer: A. 1,000 - 2,000 km

Agni-P, or Agni Prime, is a new-generation nuclear-capable ballistic missile of the Agni family developed by the Defence Research and Development Organisation (DRDO), with a range capability of 1,000 to 2,000 km.