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Olympiad (Class 6) Universe — practice questions — page 2

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 31–55 of 55.

Mars has a radius about half of Earth's. If Earth's radius is 6,400 km, Mars is about?Read the answer and worked solution →The Sun fuses hydrogen in its core. What kind of star does this make it?Read the answer and worked solution →Red dwarfs are 75 percent of fusing stars. Of 400 such stars, how many are red dwarfs?Read the answer and worked solution →The Milky Way is classed as which type of galaxy?Read the answer and worked solution →About how many stars does the Milky Way hold?Read the answer and worked solution →About how far is the Sun from the centre of the Milky Way?Read the answer and worked solution →The Solar System sits on the inner edge of which spiral arm of the Milky Way?Read the answer and worked solution →Who first resolved the hazy band of the Milky Way into individual stars with a telescope, in 1610?Read the answer and worked solution →Which galaxy is the other very large member of the Local Group alongside the Milky Way?Read the answer and worked solution →Why does the Milky Way look like a hazy band, not separate stars?Read the answer and worked solution →In the direction of which constellation does the Milky Way's centre lie?Read the answer and worked solution →The Milky Way is 87,000 light-years wide but 1,000 thick. What shape does this show?Read the answer and worked solution →What is the name of Earth's only natural satellite?Read the answer and worked solution →A new Moon is seen today. About how many days until the next new Moon?Read the answer and worked solution →The Moon's diameter is about one-quarter of Earth's. If Earth is 12,800 km wide, the Moon is about?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 mass is 1.2 percent of Earth's. If Earth's mass were 100 units, the Moon's would be about?Read the answer and worked solution →Compared with the planet Mercury, how big is the Moon?Read the answer and worked solution →A lunar eclipse happens when which event occurs?Read the answer and worked solution →Why can the Moon cover the Sun fully during a total solar eclipse?Read the answer and worked solution →What are the large dark patches on the Moon, called maria, formed by?Read the answer and worked solution →In 1959, which spacecraft made the first flyby of the Moon?Read the answer and worked solution →What is a complete cycle of lunar phases called?Read the answer and worked solution →Which large moon of Jupiter is bigger than the planet Mercury?Read the answer and worked solution →Which region is thought to be the source of long-period comets?Read the answer and worked solution →

Worked practice questions

Mars has a radius about half of Earth's. If Earth's radius is 6,400 km, Mars is about?

  1. 1,600 km
  2. 12,800 km
  3. 3,200 km
  4. 6,400 km
Show answer and solution

Correct answer: C. 3,200 km

Half of 6,400 km is 3,200 km, which matches the radius of Mars being about half of Earth's.

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The Sun fuses hydrogen in its core. What kind of star does this make it?

  1. Main-sequence star
  2. Red giant star
  3. White dwarf star
  4. Neutron star
Show answer and solution

Correct answer: A. Main-sequence star

A star that fuses hydrogen in its core is called a main-sequence star, and the Sun is one.

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Red dwarfs are 75 percent of fusing stars. Of 400 such stars, how many are red dwarfs?

  1. 100
  2. 200
  3. 400
  4. 300
Show answer and solution

Correct answer: D. 300

Seventy five percent of 400 is 300 stars.

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