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Q66 (NDA-I/2019) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Astronomy and astrophysics Answer Verified

‘Black hole’ is a

Result
Your answer: —  ·  Correct: C
Explanation

A black hole is a cosmic body formed when a massive star reaches the end of its life cycle and undergoes gravitational collapse [2]. According to the Chandrasekhar Limit, if a star's mass exceeds a certain threshold, it collapses into a region of infinite density known as a singularity [3]. This collapse results in an extremely intense gravitational field where the escape velocity exceeds the speed of light [4]. The 'surface' of a black hole is defined by the event horizon, a boundary where the gravitational pull is so great that nothing can escape [4]. Consequently, the acceleration due to gravity at or near this boundary and the singularity is exceptionally large, rather than zero, as the mass is concentrated into an infinitesimal point, causing extreme spacetime curvature [3].

Sources

  1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 1: The Universe, The Big Bang Theory, Galaxies & Stellar Evolution > Black holes > p. 15
  2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 1: The Universe, The Big Bang Theory, Galaxies & Stellar Evolution > Neutron stars > p. 14
  3. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 1: The Universe, The Big Bang Theory, Galaxies & Stellar Evolution > Explanation: > p. 7
  4. [4] https://www.britannica.com/science/black-hole
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