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WorksheetsStars and Black Holes
Total questions: 20
Worksheet time: 7mins
Name
Class
Date
1.
If a dying star's core is less than 1.4 times the mass of the Sun, it becomes ___
a)
a white dwarf
b)
a neutron star
c)
a red giant
d)
a black hole
2.
If a dying star's core is between 1.4 and 2.8 times the Sun's mass, it becomes ___
a)
a white dwarf
b)
a neutron star
c)
a red giant
d)
a black hole
3.
If a dying star's core is more than 2.8 times the Sun's mass, it becomes ___
a)
a white dwarf
b)
a neutron star
c)
a black giant
d)
a black hole
4.
For Earth, the escape velocity is about ___
a)
11 km per hour
b)
11 km per second
c)
600 km per hour
d)
600 km per second
5.
A neutron star, with its immense gravity, can have an escape velocity that's up to ___
a)
one quarter of the speed of light
b)
half the speed of light
c)
the speed of light
d)
twice the speed of light
6.
Nothing can escape, not even light, once the core of a neutron star shrinks down to ___
a)
roughly 1.8 km
b)
roughly 8.1 km
c)
roughly 18 km
d)
roughly 81 km
7.
The surface around a black hole, where the escape velocity is the speed of light, is called ___
a)
the observable boundary
b)
the event horizon
c)
the progenitor surface
d)
The Chandrasekhar Limit
8.
To become a black hole, the original star must have a mass of ___
a)
more than 1/4 of the Sun's mass
b)
more than 1.4 times the Sun's mass
c)
more than 4 times the Sun's mass
d)
more than 20 times the Sun's mass
9.
If you could turn the Sun into a black hole, then the Earth would ___
a)
quickly get pulled in
b)
orbit it slower than it does now
c)
orbit it pretty much exactly as it does now
d)
orbit it faster than it does now
10.
The strength of gravity you feel from an object depends on ___
a)
how large it is and your distance from its center
b)
how massive it is and your distance from its center
c)
how large it is and its density
d)
how massive and dense it is
11.
Black holes with masses ranging from about 3 to a few dozen solar masses are called ___
a)
dwarf black holes
b)
mini black holes
c)
stellar-mass black holes
d)
gray holes
12.
The black hole at the center of our own Milky Way galaxy has a mass of ___
a)
4.3 times the Sun's mass
b)
430 million times the Sun's mass
c)
4,300 times the Sun's mass
d)
4.3 million times the Sun's mass
13.
The vertical stretching of an object, as it falls into a black hole, is called ___
a)
fettuccination
b)
the linguine effect
c)
spaghettification
d)
the noodle response
14.
What we perceive as gravity is really just ___
a)
a dent in reality-fabric
b)
a warping of space-time
c)
a bump in the stellar-textile
d)
a bending of the event horizon
15.
Due to gravity, your clock ticks a bit slower than for someone ___
a)
in a deep mine
b)
near a neutron star
c)
far away from planets and stars
d)
near a black hole
16.
At the event horizon of a black hole, time ___
a)
slows to a crawl
b)
essentially stops
c)
speeds up
d)
reverses
17.
When you're at the event horizon, an outside observer would see the light coming from you ___
a)
infinitely blue-shift
b)
slightly blue-shift
c)
slightly red-shift
d)
infinitely red-shift
18.
From your viewpoint, as you fall into a black hole, you'd see the universe ___
a)
slow down, and the light from it blue-shift
b)
speed up, and the light from it blue-shift
c)
slow down, and the light from it red-shift
d)
speed up, and the light from it red-shift
19.
The math and physics to explain black holes is ___
a)
fairly easy to understand
b)
uncomplicated
c)
slightly complicated
d)
fiercely complicated
20.
Black holes come in different sizes, but for all of them, the escape velocity is ___
a)
a fraction of the speed of light
b)
nearing the speed of light
c)
at the speed of light
d)
greater than the speed of light
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