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

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

4 parsecs.
5 parsecs.
6 parsecs.

Question 2

Which of the following is a red dwarf?

M5 V
G2 V
O4 III

Question 3

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 4

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?

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

Question 5

In the H-R diagram, red giants 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 6

A photon has a wavelength of 530 nm. What color is it?

Blue.
Green.
Red.

Question 7

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

7
8
6

Question 8

In an atom, the protons are located...

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

Question 9

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

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

Question 10

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 planet.
A star.
A brown dwarf.

Question 11

Which of the following is a main-sequence star?

B5 II
K6 V
G2 IV

Question 12

Which of the following stars is the hottest?

K3
K9
K5

Question 13

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

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

Question 14

In the proton-proton chain, how many total hydrogen nuclei do we start with? (Remember that steps 1 and 2 happen twice in a full chain!)

2.
1.
4.

Question 15

I see a very faint 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 large.
Either the distance to the star is large or the luminosity of the star is small.

Question 16

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 17

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

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

Question 18

Star A has brighter apparent 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 19

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

0.
+1.
-1.

Question 20

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
Stellar parallax
RR Lyrae variables

Question 21

What is nuclear fusion?

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

Question 22

What kind of mass is defined as resistance of an object to acceleration?

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

Question 23

A proton is made of...

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

Question 24

Which of the following is the longest?

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

Question 25

Which of the following stars is the least bright in the sky?

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