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Science & TechnologyHardAsked in: CDS · CDS-I 2022, GK

Which one of the following statements is correct regarding LOFAR (Low Frequency Array)?

  1. A.It is the world's most powerful radio antenna.
  2. B.It is a space technology launched by NASA to discover exoplanets.
  3. C.It is an arrangement of satellites in space for the purpose of creating Satellite Navigation System.
  4. D.It is a wireless communication technology for 5G services.

Correct answer

A. It is the world's most powerful radio antenna.

Explanation

The correct answer is A, It is the world's most powerful radio antenna. LOFAR, the Low Frequency Array, is a huge radio telescope network built by ASTRON in the Netherlands, described as the largest and most sensitive radio telescope working at low frequencies. Instead of one big dish, LOFAR uses tens of thousands of small, simple antennas grouped into stations, with its core near Exloo in the Netherlands and more stations across Europe, in countries such as Germany, the United Kingdom, France, Sweden, Poland, Ireland and Latvia. Signals from all stations are combined by powerful computers, so together they act like one giant antenna about 1,000 km across. It observes radio waves of roughly 10 to 240 MHz to study the early universe, pulsars, black holes, solar activity and cosmic magnetic fields. Option B is wrong because LOFAR is a ground-based European array, not a NASA spacecraft; NASA's planet hunters include Kepler and TESS. Option C is wrong because it has nothing to do with navigation satellites such as GPS or NavIC. Option D is wrong because it is a scientific telescope, not a 5G communication technology. Exam tip: LOFAR, Netherlands-led low-frequency radio telescope array; India's GMRT is near Pune.

Practice Questions

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Q1.Science & TechnologyAsked in: CDS · CDS-I 2022, GKEasy

The terms 'Pinaka and Smerch' mentioned in news recently refer to

  1. A.Cruise missiles
  2. B.Nuclear-powered submarines
  3. C.Rocket launcher systems
  4. D.Weaponised drones
Show answer
Correct answer: C. Rocket launcher systems

Pinaka and Smerch are both multi-barrel rocket launchers used by the Indian Army's artillery. Pinaka was developed by DRDO, with the Armament Research and Development Establishment at Pune as the lead laboratory, and is named after the bow of Lord Shiva.

Q2.Science & TechnologyAsked in: CDS · CDS-II 2022, GKMedium

P-75I (or P-75 India) project refers to manufacture of

  1. A.Diesel-electric submarines.
  2. B.Nuclear-powered submarines.
  3. C.Aircraft carrier warships.
  4. D.Field guns.
Show answer
Correct answer: A. Diesel-electric submarines.

Project 75 India, or P-75I, is the Indian Navy's plan to build six advanced conventional diesel-electric submarines in India. Its key requirement is Air Independent Propulsion, which lets a conventional submarine stay submerged for much longer without surfacing to charge its batteries.

Q3.Science & TechnologyAsked in: CDS · CDS-II 2025, GKMedium

Which of the following statements about India's military arsenal is/are correct ? 1. HAMMER is a weapon system built for the Rafale fighter aircraft. 2. SCALP cruise missile is also known as Storm Shadow. 3. BrahMos missiles are built under a joint venture between India and Russia. Select the answer using the code given below :

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

All three statements describe the weapons correctly. HAMMER, short for Highly Agile Modular Munition Extended Range, is a French precision-guided air-to-ground bomb kit made by Safran; India bought it to arm its Rafale jets, which can strike targets tens of kilometres away with it.

Q4.Science & TechnologyAsked in: NDA · NDA-I 2025, GATEasy

India's Gas Turbine Research Establishment (GTRE), part of the Defence Research and Development Organisation (DRDO) has developed an aero-engine which will potentially make India self-reliance in aero-engine technology. What is the name of the engine?

  1. A.Ganga
  2. B.Yamuna
  3. C.Krishna
  4. D.Kaveri
Show answer
Correct answer: D. Kaveri

Kaveri is the turbofan aero-engine developed by the Gas Turbine Research Establishment of DRDO in Bengaluru. The Kaveri project began in the late 1980s to power the Light Combat Aircraft Tejas.

Q5.Science & TechnologyAsked in: CDS · CDS-II 2022, GKEasy

The terms 'Ethereum, Solana, Polkadot and Tether', sometimes mentioned in the news, refer to

  1. A.Cryptocurrencies
  2. B.Earth Observation Satellites
  3. C.Hypersonic Cruise Missiles
  4. D.Virtual Private Network service providers
Show answer
Correct answer: A. Cryptocurrencies

Ethereum, Solana, Polkadot and Tether are all names from the world of blockchain-based digital currencies. A cryptocurrency is a digital asset recorded on a blockchain, a shared ledger kept by many computers, and secured by cryptography rather than issued by a central bank.