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D Astro Revision

Total questions: 57

Worksheet time: 36mins

Name
Class
Date
1.

Put these objects in size order from the smallest.

a)

Comet

b)

Satellite

c)

Planet

d)

Star

e)

Galaxy

1)
2)
3)
4)
5)
2.

What is the reason a Main sequence star is so stable?

a)

The number of atoms remain the same

b)

The radiation pressure balances the pressure of weight

c)

Magnetic forces within it hold it together

d)

It has plenty of emotional support from it's friends

3.

The brightness of a star depends on two factors. Which of the following shows the two factors?

a)

the luminosity of the star and its distance from the Earth

b)

the size of the star and its colour

c)

the luminosity of the star and its size

d)

the colour of the star and its surface temperature

4.

Which of the following correctly identifies the absolute brightness of a star?

a)

the brightness of the star as seen from the Earth

b)

the amount of light emitted per second by the star

c)

the brightness of the star compared to other stars if all stars were the same distance from the Earth

d)

the colour of the star

5.

A star’s brightness depends on its _________.

Its color depends on its ___________________.

Its life cycle depends on its __________.

a)

size, mass, color

b)

size, temperature, mass

c)

temperature, mass, size

6.
All stars begin their life in a
a)
Main Sequence
b)
Nebula
c)
Protostar
d)
Black Dwarf
7.

A star has a parallax angle of 0.02 seconds of arc. How far away is it in parsecs?

(a)  

8.

Which of the following characterizes a constellation

a)

stars are physically close together

b)

stars are gravitationally bound

c)

stars are not necessarily close together

d)

stars appear to be close together

9.

The average distance between the Sun and the Earth is called

a)

Astronomical unit

b)

Parsec

c)

Light year

d)

Parallax distance

10.

Which of the following is the evidence of the expansion of universe?

a)

Blue shift

b)

Red shift

c)

Cosmic microwave background radiation (CMBR)

d)

Supernova

11.

What is responsible for the creation of universe?

a)

Dark matter

b)

Dark energy

c)

Supernova

d)

Formation of galaxies

12.

Which of the following equations represents Hubble's law?

a)

v = Hd

b)

v = H/d

c)

d = vH

d)

H = d/v

13.

What is the approximate position of giants in the shown HR diagram?

a)

D

b)

C

c)

A

d)

B

14.

Which of the following is the largest?

a)

Parsec

b)

Lightyear

c)

Astronomical Unit

d)

1 billion Kilometers

15.

In this theory, astronomers think that once a limit is reached, the universe will collapse upon itself and shrink back down to pure energy.

a)

Milky Way

b)

Big Crunch

c)

Big Dipper

d)

Nothing

16.

An H-R diagram is : (choose all that are true)

a)

Hertzsprung-Russell Diagram

b)

a diagram that compares the relationship between a star's temperature and it's magnitude.

c)

plots spectral letters and absolute magnitude on a graph

d)

Hertzmann-Ross Diagram

17.
Massive stars that are not quite large enough to turn into a black hole will turn into what when they collapse?
a)
white dwarf
b)
neutron star
c)

supergiant

d)

black dwarf

18.

Which of the following is most likely to be the mass of a stellar-mass black hole?

a)
25 solar masses
b)
100,000,000 solar masses
c)
1 solar mass
d)

0.1 solar masses

19.

The densest visible matter is found in...

a)

black dwarves

b)

white dwarves

c)

neutron stars

d)

black holes

20.

How do stars generate energy?

a)

Nuclear fusion

b)

Nuclear fission

c)

Unknown

21.

A star is close to exploding into a supernovae when it starts to form _______ at its core.

a)

Iron

b)

Carbon

c)

Niobium

d)

Uranium

22.

How did the universe start

a)

BIG BANG

b)

BIG RIP

c)

BIG CRUNCH

d)

BIG FREEZE

23.

How old is the universe

a)

29.812 billion years old

b)

13.77 billion years old

c)

10.907 billion years old

d)

Too old for anyone to guess

24.

Name any asteroid belt

(a)  

25.

Which of the following is the largest?

a)

Planet

b)

Galaxy

c)

Satellite

d)

Comet

e)

Star

26.

Which is the correct order for a star's life cycle?

a)

Main sequence -> red dwarf -> white dwarf

b)

Protostar -> main sequence -> neutron star -> Red giant

c)

Main sequence -> red supergiant -> supernova -> neutron star

d)

Red giant -> supernova -> white dwarf -> black dwarf

27.

What is the reason a Main sequence star is so stable?

a)

The number of atoms remain the same

b)

The radiation pressure balances the pressure of weight/gravity

c)

Magnetic forces within it hold it together

d)

It has plenty of emotional support from it's friends

28.

What is a comet?

a)

Large rocky ball of ice that orbits the sun

b)

Cluster of billions of stars

c)

Lumps of rock or iron that orbit the sun

d)

Minor planets

29.

Why do stars vary in brightness?

a)

They are expanding and shrinking

b)

They are changing their composition

c)

They don't it is an optical illusion

d)

Temperature

30.

Why are Cepheids so useful?

a)

They can be used to determine age

b)

They can be used to determine mass

c)

They can be used to determine size

d)

They can be used to determine distance

31.

Which of the following nebula types is LEAST associated with star birth?

a)

Planetary Nebula

b)

Dark Nebula

c)

Emission Nebula

d)

Reflection Nebula

32.

If a star has a spectral type of B9 and an absolute magnitude of +11, what star stage was it most likely just BEFORE this?

a)

High Mass Main Sequence

b)

Supergiant

c)

Planetary Nebula

d)

Neutron Star

33.

What is the period shown on this light curve graph for this variable star?

a)

.5 days

b)

1.0 days

c)

1.5 days

d)

2.0 days

34.

If a type 1 cepheid variable has a period of 12 days, what is a likely absolute magnitude?

a)

-1

b)

-2

c)

-3

d)

-4

35.

If you were comparing two cepheid variables, star Y with a period of 7 days and star Z with a period of 28 days, which would have a brighter absolute magnitude?

a)

Star Y

b)

Star Z

c)

Equal since they are both Cepheid variables

36.

Cepheids and Supernovas have recognizable and predictable light curves. These can be used to calculate absolute magnitudes and even distances. This makes them good:

a)

standard candles

b)

luminosity output standards

c)

z boson candles

d)

remnant nebulae

37.

In the early 20th Century, "faint fuzzies" displaying a variety of shapes in the sky were simply called ___

a)

faint fuzzies

b)

nebulae

c)

smoky dots

d)

bulging halos

38.

It was known, for Cepheid variables, that the time it took them to pulse was directly related to their ___

a)

luminosity

b)

size

c)

mass

d)

distance from Earth

39.

If you can measure the period of Cepheid variables, you can determine how far away they are simply by ___

a)

calculating their absolute magnitude

b)

measuring the red shift

c)

measuring their apparent brightness

d)

using spectroscopy

40.

What type of galaxy is the Milky Way?

a)

elliptical

b)

spiral

c)

peculiar

d)

irregular

41.

_____________ would be the best to use to measure the distance between galaxies

a)

Astronomical units

b)

Light seconds

c)

Light years

d)

Parsecs

42.

Stars C and D in a binary system have brightnesses B and 10B. We also know their peak wavelengths. Which of the following formulae do you use to find their surface area ratio?

a)
b)
c)
d)
e)
43.

A star has a parallax of 0.2 seconds of arc. How far away is the star in parsecs? (just write the number)

(a)  

44.

In order for fusion to occur protons need to collide rather than repel. What condition in the sun allows this force to be overcome?

a)

extreme light

b)

extreme gravity

c)

extreme heat

d)

extreme solar flares

e)

extreme pressure

45.

Reorder the following to show the proton to proton chain in nuclear fusion.

a)
b)
c)
1)
2)
3)
46.

Place the following stars in the correct place on the HR diagram.

a)cepheid variable
b)blue giant
c)red supergiant
d)the sun
e)white dwarf
f)red dwarf
1
2
3
4
5
6
1)
2)
3)
4)
5)
6)
47.
The vast majority of galaxies in our universe are moving away from us.  We know this because we observe __________ in the galaxies absorption spectra.
a)
Redshift
b)
Blueshift
c)
Turbulance
d)
Superposition
48.

The majority of matter in the universe is made of which two elements that formed after the Big Bang?

a)

Oxygen and Helium

b)

Nitrogen and Carbon

c)

Hydrogen and Helium

d)

Lithium and Oxygen

49.

Hubble observed that galaxies are

a)

exploding

b)

moving away from us

c)

moving towards us

d)

standing still

50.
Which star has the lowest luminosity?
a)
A
b)
B
c)
C
d)
D
51.
Which star has the lowest temperature?
a)
A
b)
B
c)
C
d)
D
52.
Which star is considered a Main Sequence Star?
a)
A
b)
B
c)
C
d)
D
53.
How did the discovery of Cosmic Microwave Background Radiation support the Big Bang Theory?
a)
It suggests that Hydrogen and Helium were the first elements to form.
b)
It confirms the age of the Earth to be around 5 billion years old.
c)
It supports the idea that the universe used to be hotter.
d)
It demonstrates that the universe continues to expand.
54.

Which of the following evidence suggests that the universe is expanding

a)

cosmological redshift

b)

CMBR

c)

Abundance of He

d)

the night sky is dark

55.

CMBR on its own suggests that.....

a)

the universe is expanding

b)

the universe was hotter in the past

c)

the universe is cold now

d)

the universe's expansion is accelerating

56.
Analyze this HR Diagram. Which group of stars is considered to have lower than average luminosity as well as a higher than average temperature?
a)
Giants
b)
Main Sequence
c)
White Dwarfs
d)
Super Giants
57.
Analyze this HR Diagram. Which group of stars is considered to have higher than average luminosity as well as a lower than average temperature?
a)
Giants
b)
Main Sequence
c)
White Dwarfs
d)
Super Giants

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