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Olympiad (Class 5) Universe — practice questions

Explore 59 free Universe questions in Olympiad (Class 5) 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 59.

Which body holds almost all the mass of the Solar System?Read the answer and worked solution →The Sun makes its energy by turning which gas into which other gas in its core?Read the answer and worked solution →Which planet is the smallest in the Solar System?Read the answer and worked solution →Mercury is closest to the Sun, yet its nights freeze. Why?Read the answer and worked solution →Venus is farther than Mercury but hotter at the surface. Why?Read the answer and worked solution →Which planet is the only place known to have life and liquid water on its surface?Read the answer and worked solution →Which gas makes up the largest share of the air we breathe?Read the answer and worked solution →How many natural satellites does Earth have?Read the answer and worked solution →Why does Mars look red when seen from Earth?Read the answer and worked solution →A year on Mars lasts 687 Earth days. About how many more days is it than an Earth year of 365 days?Read the answer and worked solution →Between which two planets does the asteroid belt lie?Read the answer and worked solution →Which object is the only dwarf planet in the asteroid belt?Read the answer and worked solution →The Great Red Spot is a giant storm on which planet?Read the answer and worked solution →Saturn's rings are mostly made of what?Read the answer and worked solution →Jupiter and Saturn are called gas giants because they are mostly made of which two gases?Read the answer and worked solution →Which planet is unusual because it goes around the Sun tilted on its side?Read the answer and worked solution →Which planet is the farthest from the Sun?Read the answer and worked solution →Which set has only rocky inner planets?Read the answer and worked solution →Which moon in the Solar System is the only one with a thick atmosphere?Read the answer and worked solution →Moon is to Earth as Titan is to which planet?Read the answer and worked solution →Triton is the largest moon of which planet?Read the answer and worked solution →Which of these planets has no moon at all?Read the answer and worked solution →Phobos is a small, oddly shaped moon of which planet?Read the answer and worked solution →How many planets does the International Astronomical Union count in the Solar System?Read the answer and worked solution →What force keeps the planets going around the Sun in their paths?Read the answer and worked solution →What is the solar wind?Read the answer and worked solution →Charged particles from the Sun create colourful aurorae near which places on Earth?Read the answer and worked solution →Which moon belongs to Jupiter?Read the answer and worked solution →Why do objects far from the Sun hold more ice than those near it?Read the answer and worked solution →Why did the asteroid belt never join together into a planet?Read the answer and worked solution →

Worked practice questions

Which body holds almost all the mass of the Solar System?

  1. The planet Jupiter
  2. The whole asteroid belt
  3. All eight planets together
  4. The Sun at the centre
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Correct answer: D. The Sun at the centre

The Sun alone makes up about 99.86 percent of the Solar System's mass, far more than all the planets combined.

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The Sun makes its energy by turning which gas into which other gas in its core?

  1. Oxygen into carbon dioxide
  2. Helium into hydrogen
  3. Nitrogen into oxygen
  4. Hydrogen into helium
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Correct answer: D. Hydrogen into helium

Deep in the Sun, hydrogen nuclei fuse to form helium and release huge amounts of energy.

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Which planet is the smallest in the Solar System?

  1. Mars
  2. Venus
  3. Mercury
  4. Earth
Show answer and solution

Correct answer: C. Mercury

Mercury has the smallest size of the eight planets and is also the nearest to the Sun.

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