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Ninth Grade (Grade 9) Stars Questions

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Grade 9 Stars
A red giant is formed when
  1. a star begins fusing helium.
  2. a star begins fusing hydrogen.
  3. binary stars merge.
  4. a star begins burning its hydrogen shell.
Grade 9 Stars
The H-R Diagram shows that main sequence stars
H-R Diagram With Letters - Large
  1. are mostly hot and dim.
  2. are mostly cool and bright.
  3. increase in brightness as they increase in temperature.
  4. decrease in brightness as they increase in temperature.
Grade 9 Stars
The Sun's surface exists in what state of matter?
  1. plasma
  2. solid
  3. liquid
  4. gas
Grade 9 Stars
What is the theoretical the final state of the Sun's evolution?
  1. black dwarf
  2. white dwarf
  3. supernova
  4. red giant
Grade 9 Stars
As a low mass star begins ejecting material near the end of its life, it forms what?
  1. Planetary nebula
  2. Emission nebula
  3. Stellar nebula
  4. Bok globule
Grade 9 Stars
What describes the relationship between temperature and size of stars on the main sequence?
  1. smaller stars have higher temperatures
  2. larger stars have higher temperatures
  3. smaller stars are hotter, but not as bright
  4. all stars are the same temperature on the main sequence
Grade 9 Stars
The main sequence on the H-R diagram includes
  1. white dwarfs.
  2. red giants.
  3. about 90% of all stars.
  4. pulsars.
Grade 9 Stars
A main sequence star is mostly made of which two elements?
  1. Hydrogen and Carbon
  2. Helium and Carbon
  3. Helium and Iron
  4. Hydrogen and Helium
Grade 9 Stars
When a light source moves away from an observer its
  1. pitch becomes lower.
  2. pitch becomes higher.
  3. light becomes bluer.
  4. light becomes redder.
Grade 9 Stars
Which of the following stars would be most likely to spend the longest time on the main sequence?
  1. a star with 0.05 solar masses
  2. a star with 1.2 solar masses
  3. a star with 7 solar masses
  4. a star with 15 solar masses
Grade 9 Stars
When a light source approaches an observer its
  1. pitch becomes lower.
  2. pitch becomes higher.
  3. light becomes bluer.
  4. light becomes redder.
Grade 9 Stars
What is a theoretical object that absorbs all radiation and is a perfect emitter?
  1. Emitterator
  2. Absorperator
  3. Diffraction Grating
  4. Blackbody
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