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Quiz about HR Diagram
Quiz about HR Diagram

H-R Diagram Trivia Quiz


The H-R Diagram is like the periodic table of stars. Simply knowing how to read it will tell you everything you need to know about a star.

A multiple-choice quiz by random_quasar. Estimated time: 3 mins.
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Time
3 mins
Type
Multiple Choice
Quiz #
241,678
Updated
Dec 03 21
# Qns
10
Difficulty
Average
Avg Score
6 / 10
Plays
1540
Last 3 plays: Guest 27 (0/10), Guest 99 (6/10), Guest 69 (5/10).
Question 1 of 10
1. What is the proper name of the H-R Diagram? Hint


Question 2 of 10
2. What does the H-R Diagram plot? Hint


Question 3 of 10
3. What is the most commonly used mnemonic for spectral classification? Hint


Question 4 of 10
4. The majority of the stars in the H-R Diagram are found where? Hint


Question 5 of 10
5. The H-R Diagram can also be used to find: Hint


Question 6 of 10
6. Where are the solar diameters of stars plotted on the H-R Diagram? Hint


Question 7 of 10
7. White dwarfs are found at the bottom-left corner of the H-R Diagram.


Question 8 of 10
8. There are more supergiants than giants on the H-R Diagram.


Question 9 of 10
9. Which of these is not typically found on the H-R Diagram? Hint


Question 10 of 10
10. Our star (the Sun) is part of the main sequence.



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Most Recent Scores
Mar 27 2024 : Guest 27: 0/10
Mar 26 2024 : Guest 99: 6/10
Mar 23 2024 : Guest 69: 5/10
Mar 22 2024 : Guest 216: 4/10
Mar 21 2024 : Guest 99: 5/10
Mar 15 2024 : Guest 68: 6/10
Mar 11 2024 : Guest 47: 8/10
Mar 07 2024 : Guest 68: 6/10
Feb 29 2024 : Guest 75: 1/10

Score Distribution

quiz
Quiz Answer Key and Fun Facts
1. What is the proper name of the H-R Diagram?

Answer: Hertzsprung- Russell Diagram

It is named after its two designers Ejnar Hertzsprung and Henry Norris Russell.
2. What does the H-R Diagram plot?

Answer: spectral class and absolute magnitude

The H-R Diagram plots spectral class (aka temperature) and absolute magnitude (aka luminosity).
3. What is the most commonly used mnemonic for spectral classification?

Answer: Oh Be A Fine Guy/Girl Kiss Me

The spectral classes in order of decreasing temperature are: O, B, A, F, G, K, and M. One uncommon variation of this mnemonic is "Oh Be A Fine Guy/Girl Kiss My Lips Tenderly". It was made to include L and T, which are given to stars that are so small they do not generate enough heat to begin nuclear fusion.
4. The majority of the stars in the H-R Diagram are found where?

Answer: main sequence

A star spends most of its life in the main sequence burning hydrogen fuel. Once the star has stopped burning hydrogen, it leaves the main sequence, evolves, and dies.
5. The H-R Diagram can also be used to find:

Answer: distance

Distance can be found by both main-sequence fitting for stellar clusters, and by spectroscopic parallax for individual main-sequence stars.
6. Where are the solar diameters of stars plotted on the H-R Diagram?

Answer: Diagonal lines (top left to bottom right)

The solar diameters of stars are plotted on diagonal lines that cross the diagram. Our Sun (at one solar mass) is on the most central diagonal line.
7. White dwarfs are found at the bottom-left corner of the H-R Diagram.

Answer: True

They are very small (that is why they are at the bottom), but also very bright (B or A spectral type).
8. There are more supergiants than giants on the H-R Diagram.

Answer: False

Supergiants are rare, giants are more common and found on the RGB (Red Giant Branch).
9. Which of these is not typically found on the H-R Diagram?

Answer: red dwarfs

Most H-R Diagrams exclude red dwarfs, although they exist. When they are included in the H-R Diagram they are found in the bottom-right corner.
10. Our star (the Sun) is part of the main sequence.

Answer: True

The Sun is now a part of the main sequence. In a few billion years the Sun will move up in the H-R Diagram, becoming a red giant, and eventually, a white dwarf.
Source: Author random_quasar

This quiz was reviewed by FunTrivia editor crisw before going online.
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