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Olympiad (Class 5) Earth and universe — practice questions

Explore 68 free Earth and universe questions in Olympiad (Class 5) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Earth and universe questions and exercises with answers

Showing questions 1–30 of 68.

Which process in the Sun's core produces its energy?Read the answer and worked solution →About what share of all the mass in the Solar System belongs to the Sun?Read the answer and worked solution →The surface of Venus is over 400 degrees Celsius mainly because of itsRead the answer and worked solution →Which is the only place in the universe where life is known to exist?Read the answer and worked solution →About 78 percent of the air around Earth is which gas?Read the answer and worked solution →Which gas makes up about one-fifth of Earth's air and helps us breathe?Read the answer and worked solution →Mars looks red mostly because its soil containsRead the answer and worked solution →A Mars year lasts 687 Earth days. Compared with an Earth year, it isRead the answer and worked solution →Which planet is the biggest in the Solar System?Read the answer and worked solution →Saturn's bright ring system is made mostly ofRead the answer and worked solution →Which planet orbits the Sun tilted on its side?Read the answer and worked solution →Which planet is the farthest known planet from the Sun?Read the answer and worked solution →Which two planets are gas giants made mainly of hydrogen and helium?Read the answer and worked solution →Which group lists only the rocky inner planets?Read the answer and worked solution →Which two planets have no natural moons?Read the answer and worked solution →How many natural moons does Earth have?Read the answer and worked solution →Why do we always see the same face of the Moon from Earth?Read the answer and worked solution →The Moon's diameter is about what part of Earth's diameter?Read the answer and worked solution →The changing bright shapes of the Moon through the month are calledRead the answer and worked solution →The pull between Earth and the Moon causes which event in the oceans?Read the answer and worked solution →About how many days pass from one new moon to the next new moon?Read the answer and worked solution →The Sun is 400 times wider than the Moon and 400 times farther. They lookRead the answer and worked solution →What causes day and night on Earth?Read the answer and worked solution →Seasons on Earth happen mainly because EarthRead the answer and worked solution →When the Tropic of Cancer faces the Sun, it is summer in theRead the answer and worked solution →A place above the Arctic Circle sees the Sun all day in summer. This is theRead the answer and worked solution →What is a polar night?Read the answer and worked solution →Compared with winter, summer days areRead the answer and worked solution →The summer solstice in the Northern Hemisphere is near which date?Read the answer and worked solution →About how many days does Earth take to go once around the Sun?Read the answer and worked solution →

Worked practice questions

Which process in the Sun's core produces its energy?

  1. Water turning into steam
  2. Coal burning in its core
  3. Hydrogen joining to form helium
  4. Helium splitting into hydrogen
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Correct answer: C. Hydrogen joining to form helium

The Sun's core is hot and dense enough to fuse hydrogen into helium, releasing huge energy.

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About what share of all the mass in the Solar System belongs to the Sun?

  1. About 10 percent
  2. About 50 percent
  3. About 99.86 percent
  4. About 75 percent
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Correct answer: C. About 99.86 percent

The Sun holds almost everything, 99.86 percent of the Solar System's mass, which is why planets orbit it.

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The surface of Venus is over 400 degrees Celsius mainly because of its

  1. Several large moons
  2. Strong magnetic field
  3. Huge ocean waters
  4. Heat-trapping gases
Show answer and solution

Correct answer: D. Heat-trapping gases

Venus has a thick carbon dioxide atmosphere whose greenhouse gases trap heat at the surface.

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