Practice Test

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 the longest?

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

Question 2

I see a very faint star. This could mean:

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

Question 3

In an atom, the electrons are located...

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

Question 4

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

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

Question 5

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

7
6
8

Question 6

Which of the following is a main-sequence star?

G2 IV
B5 II
K6 V

Question 7

A proton is made of...

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

Question 8

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

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

Question 9

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

RR Lyrae variables
Stellar parallax
Cepheid variables

Question 10

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

Red.
Blue.
Green.

Question 11

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 12

Which of the following is a red dwarf?

G2 V
O4 III
M5 V

Question 13

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

6 parsecs.
4 parsecs.
5 parsecs.

Question 14

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

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

Question 15

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

1.
2.
4.

Question 16

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

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

Question 17

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

A brown dwarf.
A star.
A planet.

Question 18

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

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

Question 19

What is nuclear fusion?

The process where heavy nuclei split into lighter nuclei.
The process where nuclei are destroyed and converted into pure energy.
The process where light nuclei combine into heavier nuclei.

Question 20

Which of the following stars is the coolest?

K3
K9
K5

Question 21

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

+1.
-1.
0.

Question 22

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

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

Question 23

Object A has mass 1 kg. Object B has mass 9 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 24

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

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

Question 25

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.