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Olympiad (Class 6) Universe — practice questions

Explore 55 free Universe questions in Olympiad (Class 6) General Knowledge. Open each question or exercise to read its content, reference answers and available explanation.

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Universe questions and exercises with answers

Showing questions 1–30 of 55.

If the Solar System's mass were split into 1000 equal parts, about how many parts would the Sun hold?Read the answer and worked solution →Which process in its core gives the Sun its energy?Read the answer and worked solution →A planet lies farther from the Sun than Venus but nearer than Mars. Which planet is it?Read the answer and worked solution →Which planet is the biggest and most massive in the Solar System?Read the answer and worked solution →Most planets spin in the same sense as they orbit. Which planet is an exception, spinning in retrograde?Read the answer and worked solution →Which planet orbits the Sun tilted on its side, with an axial tilt of more than 90 degrees?Read the answer and worked solution →A planet has a bright ring system around its equator made of small ice and rock pieces. Which planet is it?Read the answer and worked solution →Which two planets are the gas giants of the Solar System?Read the answer and worked solution →Which planet is the farthest known from the Sun?Read the answer and worked solution →What gives Mars its reddish colour?Read the answer and worked solution →A Mars year is 687 Earth days. How many more days than a 365 day Earth year is it?Read the answer and worked solution →Which planet is the only place known in the universe to have life and liquid water on its surface?Read the answer and worked solution →Which gas makes up about 78 percent of Earth's atmosphere?Read the answer and worked solution →Which planet has a carbon dioxide atmosphere and a surface above 400 degrees Celsius?Read the answer and worked solution →Which of these planets has no natural satellite at all?Read the answer and worked solution →What is the name of the inner moon of Mars?Read the answer and worked solution →Which moon is the only satellite in the Solar System with a substantial atmosphere?Read the answer and worked solution →Which of these is NOT one of the four large Galilean moons of Jupiter?Read the answer and worked solution →The Great Red Spot, a giant swirling storm, is found on which planet?Read the answer and worked solution →Which of these bodies is classed as a dwarf planet?Read the answer and worked solution →The Solar System has eight planets, four of them terrestrial and two gas giants. How many are ice giants?Read the answer and worked solution →In which region of the Solar System is the asteroid belt found?Read the answer and worked solution →Why does a comet grow a long tail when it nears the Sun?Read the answer and worked solution →What is the shape of the path along which a planet travels around the Sun?Read the answer and worked solution →Seen from above Earth's north pole, in which direction do the planets go around the Sun?Read the answer and worked solution →About how long ago did the Solar System form from a collapsing cloud?Read the answer and worked solution →What is the continuous stream of charged particles flowing out from the Sun called?Read the answer and worked solution →Charged particles from the Sun hitting Earth's upper atmosphere near the magnetic poles produce what sight?Read the answer and worked solution →Earth is 1 AU from the Sun. The frost line lies at roughly how many AU?Read the answer and worked solution →Mercury's equator swings from minus 170 to 420 degrees Celsius. What is the total swing?Read the answer and worked solution →

Worked practice questions

If the Solar System's mass were split into 1000 equal parts, about how many parts would the Sun hold?

  1. About 500 parts
  2. About 750 parts
  3. About 900 parts
  4. About 999 parts
Show answer and solution

Correct answer: D. About 999 parts

The Sun holds 99.86 percent of the total mass, which is close to 999 parts in 1000.

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Which process in its core gives the Sun its energy?

  1. Iron melting in the core
  2. Helium splitting into hydrogen
  3. Carbon burning in oxygen
  4. Hydrogen fusing into helium
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Correct answer: D. Hydrogen fusing into helium

Nuclear fusion of hydrogen nuclei into helium at enormous temperature and pressure releases the Sun's energy.

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A planet lies farther from the Sun than Venus but nearer than Mars. Which planet is it?

  1. Mercury
  2. Jupiter
  3. Earth
  4. Saturn
Show answer and solution

Correct answer: C. Earth

The four inner planets in order from the Sun are Mercury, Venus, Earth and Mars, so Earth sits between Venus and Mars.

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