ASTRO 7N EXAM 2 LATEST ACTUAL EXAM

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ASTRO 7N EXAM 2 LATEST 2025 / 2026 ACTUAL EXAM

WITH COMPLETE QUESTIONS AND CORRECT

DETAILED ANSWERS (100% VERIFIED ANSWERS)

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A high-luminosity star...

• is always at a larger distance than a low-luminosity star
• emits more light than a low-luminosity star
• is always redder than a star with a lower luminosity
• is at a lower temperature than a low-luminosity star
• is always at a smaller distance than a low-luminosity

star - Answer-B

If a red giant appears the same brightness as a red main sequence star, which one is further away?

• the red giant
• we cannot tell
• it depends on the phase of the moon
• the main sequence star 1 / 3

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• they are at the same distance - Answer-A

The heaviest nuclei of all are formed...

• during helium burning
• as part of the p-p chain
• during the carbon burning
• during supernova explosion
• during all stages of stellar evolution of massive stars -

Answer-D

Fill in the blank in the following chemical reaction that occurs in the Sun: Hydrogen-2 + proton = + energy:

• hydrogen-2
• Hydrogen-1
• Helium-3
• Carbon-12
• Helium - 4 - Answer-C

Which of the following has the smallest radius?

• type A main sequence star 2 / 3

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• main sequence star with surface temperature 8000K
• type K main sequence star
• white dwarf
• neutron star - Answer-E

Why does the main sequence part of a star's life end?

• the helium in the core is exhausted
• the gravitational force is no longer large enough to

balance the pressure

• The hydrogen in the core is exhausted
• the temperature drops so that nuclear reactions are no

longer possible

• much of the mass of the star has evaporated - Answer-

C

Which of the following will have the shortest lifetime on the main sequence?

• main sequence star with surface temperature 20000K
• main sequence star with surface temperature 3000K
• main sequence star with luminosity one tenth that of the

sun

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