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Black Holes
Test Description: Review Questions
Instructions: Answer all questions to get your test result.
1) The ____________________ of a black hole is the point in space where all the mass of a black hole accumulates.
A
event horizon
B
point of no return
C
X-ray-free zone
D
singularity
2) In order for a massive star to form a black hole, it must first ________________.
A
begin rotating
B
run out of fuel
C
emit X-rays
D
expand
3) What is the lower limit for the mass of a black hole?
A
3 solar masses
B
30 solar masses
C
10 solar masses
D
2 solar masses
4) Black holes form when ___________________overcomes the outward________________produced by nuclear reactions within a star.
A
gravity; pressure
B
energy; pressure
C
gravity; energy
D
pressure; energy
5) Convincing evidence suggests that supermassive black holes exist
A
in orbits around neutron stars
B
in the centers of most galaxies
C
between galaxies in interstellar space
D
at the edge of many solar systems
6) If gas approaches a black hole, it will often heat up and emit ________________ that can be detected telescopically.
A
white light
B
purple light
C
radio waves
D
x-ray
7) Which observation most likely indicated the presences of a black hole?
A
There is a pitch-black region in space with nothing else around it
B
Nearby objects are undergoing a gravitational effect
C
A particular area is producing lots of radiation in all pars of the electromagnetic spectrum
D
X-rays are emitted from a source and then quickly pulled back in again.
8) The area within the event horizon of a black hole is completely
A
white
B
black
C
colorless
D
clear
9) What exists between a black hole's even horizon and its singularity?
A
some of the black hole's mass
B
we don't know
C
trapped light
D
nothing
10) What can be detected within the event horizon of a black hole?
A
matter
B
nothing
C
energy
D
its singularity
*select an answer for all questions
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