ASTR 1P01/02: Introduction to Astronomy I/II

Practice Exam

Please solve the following questions. This is not a real exam, it will not be graded, and you do not need to submit your solutions to anyone. The questions are simply intended to help you practice for the real exam.

These questions will not appear in the exam itself. Students who don't genuinely attempt to solve the questions on their own, and only memorize the solutions, will have a very hard time in the actual exam!

This sample exam is online, but the real exam will be given in person, at a time and place indicated on the course website.

THIS IS NOT THE ACTUAL EXAM!
THIS IS JUST A PRACTICE EXAM!
THE REAL EXAM IS IN PERSON!

If you need any clarifications for these questions, you can ask for them on the course Teams channel.

Question 1

Which of the following is a blue giant?

M5 V
O4 III
M2 III

Question 2

Star A has brighter absolute magnitude than star B. What does that say about the luminosity of the two stars?

There's no way to know unless we also know the distance to each star.
Star A is more luminous.
Star B is more luminous.

Question 3

If the spectral lines of a star shift toward blue, this means...

The star is moving toward us.
The star is moving away from us.
The star is not moving with respect to us.

Question 4

I see a very bright star. This could mean:

Either the distance to the star is small or the luminosity of the star is large.
Either the distance to the star is large or the luminosity of the star is small.
Either the distance to the star is large or the luminosity of the star is large.

Question 5

Object A has mass 1 kg. Object B has mass 3 kg. According to E=mc², how much rest energy does object B have compared to A?

9 times more energy.
3 times more energy.
3 times less energy.

Question 6

A proton is made of...

1 up quark and 2 down quarks.
1 up quark and 1 down quark.
2 up quarks and 1 down quark.

Question 7

In an atom, the protons are located...

Outside the nucleus.
Inside the nucleus.
Either inside or outside the nucleus, depending on the type of atom.

Question 8

A star is located on the top left of the H-R diagram. This star has...

High luminosity and high temperature.
Low luminosity and low temperature.
High luminosity and low temperature.

Question 9

I want to measure the distance to a star that is estimated to be a few million light-years away. Which method should I use?

Cepheid variables
RR Lyrae variables
Stellar parallax

Question 10

Which of the following stars is the brightest in the sky?

A star with apparent magnitude -4.4.
A star with apparent magnitude +7.0.
A star with apparent magnitude +3.1.

Question 11

In the proton-proton chain, how many total helium nuclei do we end up with?

2.
1.
4.

Question 12

What happens in electron-positron annihilation?

An electron and a positron annihilate each other and produce 1 photon.
An electron and a positron annihilate each other and no photons are produced.
An electron and a positron annihilate each other and produce 2 photons.

Question 13

Which is the dominant process used in a star with 2.7 solar masses to generate light?

The CNO cycle.
The proton-proton chain.
Deuterium fusion.

Question 14

Which of the following is the longest?

1 light-year.
1 trillion kilometers.
1 parsec.

Question 15

Which of the following is a main-sequence star?

G2 IV
K6 V
B5 II

Question 16

A photon has a wavelength of 700 nm. What color is it?

Red.
Blue.
Green.

Question 17

Which of the following stars is the coolest?

K9
K5
K3

Question 18

In the H-R diagram, red dwarfs can be found...

At higher luminosity and lower temperature than the main sequence.
On the main sequence.
At higher luminosity and higher temperature than the main sequence.

Question 19

I observed an object, larger than Earth but smaller than the Sun, which does not generate light by either deuterium or hydrogen fusion. What is it?

A star.
A planet.
A brown dwarf.

Question 20

I found a hydrogen-9 isotope. How many neutrons does it have?

8
6
7

Question 21

Photon A has wavelength 2 cm. Photon B has wavelength 1 cm. Which photon has a higher frequency?

Both have the same frequency.
Photon B.
Photon A.

Question 22

If a particle has charge +1, what would be the charge of its antiparticle?

0.
+1.
-1.

Question 23

A star was measured to have a parallax of 0.25 arc seconds. How far away is the star?

5 parsecs.
4 parsecs.
6 parsecs.

Question 24

What kind of mass is defined as the strength of an object's gravitational field?

Inertial mass.
Neither of the other options is correct.
Gravitational mass.

Question 25

Compared to cepheid variables, RR Lyrae variables typically have...

Higher luminosity and shorter period.
Lower luminosity and shorter period.
Higher luminosity and longer period.