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Olympiad (Class 11) Astronomy — practice by topic

Browse 30 questions across 3 Astronomy topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Astronomy topics

Astronomy (30)Observing the Sky (30)Olympiad Astronomy (30)

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The early Greeks pictured the stars as fixed to a giant turning ball. They called it the:Read the answer and worked solution →A modern student is told the nightly turning of the sky is really caused by:Read the answer and worked solution →Earth's axis extended outwards meets the sky at two points called the celestial:Read the answer and worked solution →An observer in San Francisco at latitude 38 degrees north sees the north celestial pole at:Read the answer and worked solution →

Worked practice questions

The early Greeks pictured the stars as fixed to a giant turning ball. They called it the:

  1. Celestial sphere
  2. Planetary system
  3. Universal circle
  4. Heavenly ladder
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Correct answer: A. Celestial sphere

1. The Greeks needed a picture for the fixed pattern of stars. 2. They imagined a great ball carrying the stars around us. 3. That picture is the celestial sphere. _Source: OpenStax Astronomy 2e, Chapter 2, Observing the Sky: The Birth of Astronomy._

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A modern student is told the nightly turning of the sky is really caused by:

  1. Moon pulling
  2. Earth spinning
  3. Stars drifting
  4. Sun orbiting
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Correct answer: B. Earth spinning

1. The sphere of stars does not actually rotate. 2. The planet we stand on turns instead. 3. So the motion comes from Earth spinning. _Source: OpenStax Astronomy 2e, Chapter 2, Observing the Sky: The Birth of Astronomy._

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Earth's axis extended outwards meets the sky at two points called the celestial:

  1. Poles
  2. Belts
  3. Rings
  4. Lines
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Correct answer: A. Poles

1. The axis pierces the imaginary sphere at two spots. 2. These are the north and south points of the sky. 3. So they are the celestial poles. _Source: OpenStax Astronomy 2e, Chapter 2, Observing the Sky: The Birth of Astronomy._

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