🔬 Science & TechnologyUPSC 2000Space & Space Technology

A ‘black hole’ is a body in space which does not allow any radiation to come out. This property is due to its:

avery small size
bvery large size
cvery high density
dvery low size
✓ Correct answer: c) very high density
ExplanationA black hole is a region in space where gravity is so intense that not even light or any form of radiation can escape from it.This extreme gravitational pull is a result of its very high density, as the mass of the black hole is compressed into a very small volume, creating a gravitational field strong enough to trap light and radiation.Event Horizon: The boundary around a black hole beyond which nothing, not even light, can escape due to the extreme gravitational pull.Singularity: The point at the center of a black hole where gravity is infinitely strong, and matter is thought to be crushed to an infinitely small point with infinite density.Schwarzschild Radius: The radius of the event horizon, which depends on the mass of the black hole.It defines the size of the black hole’s event horizon.Accretion Disk: A rotating disk of matter, such as gas and dust, that orbits a black hole.The matter in the disk heats up as it spirals toward the event horizon.Hawking Radiation: A theoretical prediction by physicist Stephen Hawking that black holes can emit radiation due to quantum effe

Practice more Science PYQs

Attempt a free 10-question quiz or browse the full Science & Technology previous-year-question bank with instant answers and explanations.

🔬 Science PYQs →