Q. With reference to Black Hole and Neutron Stars, consider the following statements:
1.Like black holes, neutron stars are formed due to the process known as supernova explosion
2.The mass of a neutron star is generally 1 to 3 times the mass of Sun. Anything less than that will be identified as a black hole.
3.Neutron star would be having a hard surface while a black hole does not have a surface.
Which of the statements given above is/are correct?

[A] 1 and 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: C
Notes:

Statement 1 is correct: Like black holes, neutron stars are formed due to the process known as supernova explosion when the centre of a very big star falls in upon itself, or collapses.

Statement 2 is incorrect: The mass of a neutron star is generally 1 to 3 times the mass of Sun. Anything greater than that will be identified as a black hole.

Statement 3 is correct: Neutron star would be having a hard surface while a black hole does not have a surface.

Source: The Hindu