WorksheetsLow Mass Stars
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
Very roughly speaking, we can divide stars into two groups: ___
a)
low mass stars, and high mass stars
b)
bright stars and dim stars
c)
dwarfs and giants
d)
low mass stars, and super-giants
2.
The dividing line between low mass stars and high mass stars lies around ___
a)
half the mass of the Sun
b)
twice the mass of the Sun
c)
eight times the mass of the Sun
d)
80 times the mass of the Sun
3.
During the fusion of hydrogen, four protons, plus some other ingredients, get turned into ___
a)
four neutrons
b)
four photons
c)
one helium nucleus
d)
one lithium nucleus
4.
A higher mass star squeezes hydrogen harder, so ___
a)
it fuses more slowly
b)
it fuses more quickly
c)
it fuses into lithium
d)
it fuses into deuterium
5.
For a star, the lower its mass, ___
a)
the larger its apparent magnitude
b)
the brighter it is
c)
the shorter it lives
d)
the longer it lives
6.
How long can a really low mass red dwarf last?
a)
a thousand years
b)
a million years
c)
a billion years
d)
a trillion years
7.
When a low mass red dwarf dies, it will be nearly pure ___
a)
hydrogen
b)
helium
c)
lithium
d)
deuterium
8.
With stars like the Sun, the material in the core ___
a)
stays in the core
b)
convects to the radiative zone
c)
mixes with the convective zone
d)
convects to the surface
9.
What is the total life span of the Sun?
a)
about two million years
b)
about twelve million years
c)
about two billion years
d)
about twelve billion years
10.
The Sun's cores is getting ___
a)
less dense and hotter
b)
less dense and cooler
c)
denser and hotter
d)
denser and cooler
11.
Since it was born, the Sun has increased in luminosity by about ___
a)
8%
b)
40%
c)
80%
d)
400%
12.
When the Sun runs out of hydrogen in the core, ___
a)
it will fuse helium into carbon
b)
it will fuse helium into oxygen
c)
it will fuse helium into neon
d)
hydrogen outside the core will start to fuse
13.
As the Sun grows to well over twice its current size, it will be classified as ___
a)
a subgiant
b)
a giant
c)
a supergiant
d)
a hypergiant
14.
As the Sun bloats up to 10 to 150 times its present size, it will be classified as ___
a)
a red subgiant
b)
a red giant
c)
a red supergiant
d)
a red hypergiant
15.
When it turns into a red giant, the Sun will increase its luminosity by about ___
a)
two times
b)
20 times
c)
200 times
d)
2000 times
16.
At some point, after being a red giant, the Sun's core will heat up enough to fuse helium into ___
a)
carbon
b)
silicon
c)
sodium
d)
iron
17.
When fusion has stopped, and the Sun has blown off its outer layers, it will be classified as ___
a)
a white dwarf
b)
a red dwarf
c)
a white subgiant
d)
a red subgiant
18.
When the Sun expands, it'll reach a radius very close to the size of ___
a)
Mercury's orbit now
b)
Neptune's orbit now
c)
Earth's orbit now
d)
Jupiter's orbit now
19.
As the Sun expands it loses mass, and the Earth will ___
a)
move toward the Sun, into a smaller orbit
b)
move out from the Sun, into a bigger orbit
c)
move toward the Sun, into a tidal locked orbit
d)
move out from the Sun, into a tidal locked orbit
20.
In order to squeeze carbon nuclei hard enough to fuse them together, a star needs a mass ___
a)
about twice the Sun's mass
b)
about 8 times the Sun's mass
c)
about 40 times the Sun's mass
d)
about 80 times the Sun's mass
100 %
