WorksheetsT4: Stars, Exoplanet, brown Dwarf
Total questions: 30
Worksheet time: 15mins
Name
Class
Date
1.
How many stars are in space?
a)
10,000
b)
millions
c)
trillions
2.
The smallest and the most common stars giving off very little light.
a)
Blue Giant stars
b)
Red Dwarf stars
c)
White Dwarf stars
d)
Neutron stars
3.
Stars that are very bright, large & burn at the highest temperature
a)
Blue Giant stars
b)
Red Giant
c)
Neutron stars
d)
Proto stars
4.
The atmosphere of the sun has three parts
a)
corona, chromosphere, photosphere
b)
corona, core, hydrosphere
c)
corona, magnitude, mantle
d)
corona, geosphere, biosphere,
5.
The letters 'O', 'B', 'A', 'F', 'G', 'K' and 'M' arrange stars in order from ___
a)
hottest to coolest
b)
coolest to hottest
c)
largest to smallest
d)
smallest to largest
6.
The classification scheme used today arranges stars by ___
a)
their size, assigning each a number
b)
their size, assigning each a letter
c)
their temperature, assigning each a number
d)
their temperature, assigning each a letter
7.
The total amount of energy emitted by a star is called its ___
a)
incandescence
b)
luminosity
c)
spectral integrity
d)
apparent brightness
8.
The luminosity of a star depends on ___
a)
its size and temperature
b)
its age and density
c)
its size and distance from us
d)
its age and distance from us
9.
A planet outside of our solar system that orbits a star is officially called ___
a)
an alien planet
b)
an exoplanet
c)
a martian planet
d)
a distant planet
10.
As the host star of the exoplanet makes its little circle, its light will undergo a ___
a)
polarization shift
b)
reflexive shift
c)
Mach shift
d)
Doppler shift
11.
A more massive planet pulls harder on the star, making it move ___
a)
more quickly
b)
more slowly
c)
erratically
d)
imperceptibly
12.
Giant gaseous exoplanets that orbit very close to their parent star are called ___
a)
"hot Jupiters"
b)
"quick Saturns"
c)
"short period Saturns"
d)
"high rate Jupiters"
13.
When a planet passes directly in front of its star, the event is called ___
a)
a transit
b)
en passant
c)
a transition
d)
a permutation
14.
The beauty of transiting exoplanets is that the amount of starlight blocked tells you ___
a)
how far away the planet is
b)
how big the planet is
c)
the density of the planet
d)
the mass of the planet
15.
If we know the planet's mass from the star's Doppler shift, we can use the planet's size to calculate ___
a)
its distance
b)
its density
c)
its luminosity
d)
its apparent brightness
16.
A gas giant like Jupiter has a relatively ___
a)
low mass
b)
high mass
c)
low density
d)
high density
17.
The smallest exoplanet found is ___
a)
not much bigger than Earth's moon
b)
about the size of Mercury
c)
about the size of Mars
d)
not much smaller than Earth
18.
How many exoplanets are estimated to be in our galaxy alone?
a)
millions
b)
hundreds of millions
c)
billions
d)
hundreds of billions
19.
What is the minimum condition when stating that there are "10 billion Earth-like planets in our galaxy"?
a)
temperatures where liquid water could exist
b)
a similar atmosphere to Earth
c)
a strong magnetic field and density
d)
liquid water exists on their surface
20.
Energy is generated in the cores of stars by fusing ___
a)
hydrogen into helium
b)
helium into hydrogen
c)
hydrogen into Neon
d)
helium into lithium
21.
The expansion created by the heat of fusion is usually balanced by a star's gravity, creating ___
a)
an imbalance
b)
a conversion
c)
an inversion
d)
an equilibrium
22.
In gas giants, like Jupiter, the force of gravity is balanced by ___
a)
the heat of fusion
b)
simple gas pressure
c)
tidal forces
d)
centripetal forces
23.
The minimum mass for fusing hydrogen, and becoming a star, is roughly ___
a)
twice the mass of Jupiter
b)
7 times the mass of Jupiter
c)
75 times the mass of Jupiter
d)
half the mass of the Sun
24.
Objects with a mass range between the heaviest planets and the lightest stars became known as ___
a)
red gnomes
b)
brown gnomes
c)
red dwarfs
d)
brown dwarfs
25.
Astronomers classify stars, using letters, based on their ___
a)
temperature
b)
size
c)
luminosity
d)
composition
26.
Which element is found in low-mass brown-dwarfs, but not in regular stars?
a)
sodium
b)
magnesium
c)
lithium
d)
beryllium
27.
A new cooler class of star, discovered in 1988, was given the letter ___
a)
'O'
b)
'L'
c)
'F'
d)
'M'
28.
Which delicate molecule was found in the spectrum of Gliese 229B, the first T dwarf?
a)
carbon monoxide
b)
carbon dioxide
c)
methane
d)
ammonia
29.
As brown dwarfs get more massive, they ___
a)
get smaller and denser
b)
get denser, but not bigger
c)
get larger and denser
d)
get bigger, but not denser
30.
Brown dwarfs are not considered true stars because they don't fuse ___
a)
hydrogen
b)
silicon
c)
lithium
d)
beryllium
100 %
