UPSC Prelims 2023·GS1·science-and-technology·defence

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?

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Last updated 23 May 2026, 3:31 pm IST
  1. A1 only
  2. B2 only
  3. CBoth 1 and 2
  4. DNeither 1 nor 2Correct

Explanation

Let's analyze each statement regarding missiles: 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. Ballistic missiles: This part is incorrect. Ballistic missiles are typically rocket-powered during an initial boost phase, then follow a unpowered, parabolic (ballistic) trajectory guided by gravity and aerodynamics. They achieve very high, often hypersonic, speeds (much faster than subsonic) during their flight. They are not jet-propelled throughout. Cruise missiles: This part is also incorrect. Cruise missiles are jet-propelled (using engines like turbofans or ramjets) and fly at relatively constant altitudes, often guided throughout their flight. While some may use a solid rocket booster for launch, their primary propulsion is usually continuous jet propulsion, not just rocket-powered in the initial phase. They can be subsonic, supersonic, or hypersonic. Therefore, Statement 1 is incorrect. 2. Agni-V is a medium-range supersonic cruise missile, while BrahMos is a solid-fuelled intercontinental ballistic missile. Agni-V: This part is incorrect. Agni-V is an Intercontinental Ballistic Missile (ICBM) developed by India, designed to deliver nuclear warheads. It is a long-range ballistic missile, not a medium-range supersonic cruise missile. BrahMos: This part is also incorrect. BrahMos is a supersonic cruise missile (a joint venture between India and Russia). It is not a solid-fuelled intercontinental ballistic missile. It is powered by a ramjet engine for supersonic flight. Therefore, Statement 2 is incorrect. Since both statements are incorrect, the correct option is 'Neither 1 nor 2'.
science-and-technology: Consider the following statements: 1. Ballistic missiles are jet-propelled at subsonic speeds throughout their flights,

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