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Quiz Chapter 11: Stars and Galaxies in the Universe

10 questions · Form 2 Science Bab 10: Stars and Galaxies in the Universe

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Why does a star stop shining at the end of its White Dwarf stage?

  1. It explodes into a supernova
  2. It runs out of heat energy and slowly cools into a cold Black Dwarf
  3. It turns into a planet
  4. It gets absorbed by the Sun
Show answer

Answer: B

A white dwarf no longer undergoes nuclear fusion; it slowly radiates its remaining heat into space until it completely cools.

2. Which star color indicates the HOTTEST surface temperature?

  1. Red
  2. Yellow
  3. Orange
  4. Blue
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Answer: D

Blue stars have the highest surface temperatures (ranging from 25,000 K to over 50,000 K), whereas red stars are the coolest.

3. What catastrophic cosmic explosion occurs when a supermassive star dies?

  1. Planetary nebula expansion
  2. Supernova explosion
  3. Solar flare discharge
  4. Coronal mass ejection
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Answer: B

When a massive or supermassive star exhausts its nuclear fuel, its core collapses rapidly, causing a violent supernova explosion.

4. Which physical process powers a main sequence star and generates light and heat energy?

  1. Chemical combustion of methane gas
  2. Nuclear fusion of hydrogen nuclei into helium
  3. Radioactive decay of heavy uranium atoms
  4. Frictional heating between orbital planets
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Answer: B

In a star's core, extreme temperature and gravitational pressure fuse hydrogen nuclei into helium through nuclear fusion, releasing immense energy.

5. Which factor does NOT directly determine the brightness of a star as observed from Earth?

  1. Actual size of the star
  2. Surface temperature of the star
  3. Distance from Earth
  4. Number of moons orbiting the star
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Answer: D

Apparent brightness depends on physical size, luminosity (surface temperature), and distance from Earth. Moons do not affect stellar brightness.

6. What structural category of galaxy does our Milky Way belong to?

  1. Elliptical galaxy
  2. Irregular galaxy
  3. Spiral galaxy
  4. Lenticular galaxy
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Answer: C

The Milky Way is classified as a spiral galaxy, featuring a rotating disk with prominent spiral arms.

7. Which galaxy type lacks a distinct symmetrical shape or central bulge?

  1. Spiral galaxy
  2. Barred spiral galaxy
  3. Elliptical galaxy
  4. Irregular galaxy
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Answer: D

Irregular galaxies have chaotic, irregular shapes without a defined spiral structure or central elliptical nucleus.

8. The Large Magellanic Cloud is classified under which type of galaxy?

  1. Spiral galaxy
  2. Elliptical galaxy
  3. Irregular galaxy
  4. Ring galaxy
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Answer: C

The Large Magellanic Cloud and Small Magellanic Cloud are satellite galaxies of the Milky Way classified as irregular galaxies.

9. Which list orders star surface temperatures correctly from LOWEST to HIGHEST?

  1. Blue -> Yellow -> Red
  2. Red -> Yellow -> Blue
  3. Yellow -> Blue -> Red
  4. Blue -> Red -> Yellow
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Answer: B

Red stars are the coolest (~3,000 K), Yellow stars are medium (~6,000 K), and Blue stars are the hottest (>25,000 K).

10. In what chronological order does a medium-mass star evolve throughout its life?

  1. Nebula -> Main Sequence -> Red Giant -> White Dwarf
  2. Main Sequence -> Nebula -> Supernova -> Black Hole
  3. Red Giant -> White Dwarf -> Nebula -> Protostar
  4. Supernova -> Red Giant -> Main Sequence -> White Dwarf
Show answer

Answer: A

Stars form in a Nebula, enter the Main Sequence stage, expand into a Red Giant, and eventually shrink into a White Dwarf.

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