Earth Systems Unit 5 Space Lesson 2 Quiz

What is the small, hot, extremely dense core left after a star collapses called?

• red giant

• red dwarf

• black dwarf

• white dwarf

During the main-sequence stage, how is energy generated in a star’s core?

• Carbon fuses into oxygen.

• Hydrogen fuses into helium.

• Carbon fuses into hydrogen.

• Helium fuses into hydrogen.

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NGSS.HS-ESS1-1

NGSS.HS-PS1-8

How long would a star with the sun’s mass stay on the main sequence?

• until it makes iron

• until it makes uranium

• as long as it fuses helium

• as long as it fuses hydrogen

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NGSS.HS-ESS1-1

After its temperature rises to 10,000,000 °C, when does a protostar become a star?

• nuclear fusion ends

• nuclear fission ends

• nuclear fusion begins

• nuclear fission begins

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NGSS.HS-ESS1-1

NGSS.HS-PS1-8

What is a large, bright star whose hot core has used most of its hydrogen?

• nova

• giant

• pulsar

• supernova

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NGSS.HS-ESS1-1

Which of these is not a characteristic of white dwarfs?

• a long period of existence

• a hot, extremely dense core

• a ring-like planetary nebula

• a position in the lower left of the H-R diagram

What is the color of the hottest stars?

• red

• blue

• white

• yellow