The supernova explosion scatters the matter in the envelope into space. The heavy core continues contracting and becomes a neutron star. The fate of the neutron star depends again on its mass. It has been conjectured that heavy neutron stars could continue to contract indefinitely. This implies that the vast amount of matter in the neutron star would be packed eventually into a point, such an infinitely dense object called a black-hole, would not let anything escape from it, not even light. Black holes are therefore invisible. Pulsars, Due to the decrease of the hydrogen content the star explodes as a supernova. The variable star born as the remaining part of the supernova is called a pulsar. Let's know more about the theory of the Black Hole In Astrophysics.
1. Which of the following is the Black Hole?
A. Hole in the ozone layer of atmosphere
B. Hole in the earth's centre
C. Highly dense matter available in the atmosphere
D. Hole in troposphere
2. Which are called shooting stars?
A. ASteroids
B. Meteors
C. Comets
D. None of these
3. Which of the following are the main parts of a black hole?
A. Singularity
B. Outer Event Horizon
C. Inner Event Horizon
D. All of the above
4. The tail of the comet points_______.
A. Towards the sun
B. Away from the Sun
C. In orbitary direction
D. Away from the Earth
5. The name black hole is given because...
A. It is part of space which has no matter
B. It is completely made up of carbon
C. Its gravity is so high that it prevents even light to radiate into space
D. All of the above
6. Which of the following are the types of black holes?
A. Stellar
B. Intermediate
C. Supermassive
D. All of the above
7. What event ultimately causes black holes to die?
A. Hawking radiation
B. Quantum effects
C. Both of the above
D. None of these
8. The most distant black hole ever detected is located in.....
A. About 11.8 billion years
B. About 13.8 billion years
C. About 25.8 billion years
D. About 55.8 billion years
9. Which of the following is the nearest black hole to Earth?
A. Betelgeuse
B. Alpha Centauri
C. Proxima Centauri
D. All of the above
10. What is the distance of the nearest black hole to Sun?
A. 0.244 light-years away from the Sun
B. 4.244 light-years away from the Sun
C. 44.244 light-years away from the Sun
D. 444.244 light-years away from the Sun
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