Technology : Space Technology

Q 5 / 21

UPSC CSE Prelims 2023

Consider the following statements :
  1. Ballistic missiles are jet-propelled at subsonic speeds throughout their flights, while cruise missiles are rocket-powered only in the initial phase of flight.
  2. Agni-V is a medium-range supersonic cruise missile, while BrahMos is a solid-fuelled intercontinental ballistic missile.
Which of the statements given above is/are correct?

EXPLANATION

Correct Option (d)

Explanation

Statement 1 is incorrect.

  • Ballistic missiles are primarily rocket-propelled, typically powered only during their initial flight phase to achieve a high altitude and velocity. They then follow a parabolic, unpowered trajectory, re-entering the atmosphere at supersonic or hypersonic speeds.
  • Cruise missiles, conversely, are jet-propelled (using turbofan, turbojet, or ramjet engines) and are powered throughout most of their flight. They fly within the atmosphere, maintaining a relatively constant altitude and speed, which can be subsonic or supersonic. The statement incorrectly attributes jet propulsion and subsonic speeds to ballistic missiles and limits cruise missile propulsion to only the initial phase.

Statement 2 is incorrect.

  • Agni-V is an Intercontinental Ballistic Missile (ICBM), not a cruise missile. It is a solid-fuelled missile designed for strategic deterrence with a range of approximately 5,000-5,500 km.
  • BrahMos is a supersonic cruise missile, not a solid-fuelled intercontinental ballistic missile. It is a ramjet-powered missile with a range typically around 290-400 km (with extended variants under development), known for its precision strike capability.

Since both statements 1 and 2 are factually incorrect, option (d) is the correct choice.

Incorrect Options

Option (a) is incorrect because Statement 1 contains factual inaccuracies regarding missile propulsion and flight characteristics.

Option (b) is incorrect because Statement 2 misidentifies the types and characteristics of Agni-V and BrahMos missiles.

Option (c) is incorrect as both Statement 1 and Statement 2 are factually incorrect.

SOURCEScience & Technology by Ravi Agrahari