Which one of the following is an object with such a strong gravitational field that even light cannot escape from its surface ?

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Q: 70 (CDS-I/2009)
Which one of the following is an object with such a strong gravitational field that even light cannot escape from its surface ?

question_subject: 

Geography

question_exam: 

CDS-I

stats: 

0,51,13,4,5,51,4

keywords: 

{'strong gravitational field': [0, 0, 1, 0], 'neutron star': [1, 0, 0, 0], 'black hole': [1, 1, 0, 0], 'white dwarf': [1, 0, 1, 0], 'supernova star': [0, 0, 1, 0], 'surface': [1, 0, 0, 0], 'object': [1, 0, 11, 43]}

The correct answer is option 3: Black hole.

A black hole is an object in space that has an extremely strong gravitational field. It is formed when a massive star collapses under its own gravity, causing a region of space to become incredibly dense. The gravitational force in a black hole is so strong that nothing, including light, can escape from its surface. This is why it is known as a "black" hole - because it does not emit or reflect any light.

Option 1: A neutron star is a highly dense type of star that is formed after a supernova explosion. While it has a strong gravitational field, it is not as powerful as a black hole and light can escape from its surface.

Option 2: A white dwarf is a type of star that has reached the end of its life and collapsed in on itself. It does not have a strong enough gravitational field to trap light.

Option 4: A supernova star is a massive star that has reached the end of its life and exploded. Although it can release an immense amount of energy, it does not have a gravitational field strong enough to prevent light from escaping.

So, the correct answer is option 3, black hole, as it is the only object with a gravitational field so