Science Quiz

  1. How does a magnifying glass work ?
  2. What is the difference between an atom bomb and an hydrogen bomb ?
  3. Explain why a feather and a hammer fall together when dropped side by side on the moon at the same time ?
  4. What is heavy water?
  5. Why is the grass green ?
  6. When is ... ?

How does a magnifying glass work ?

Light rays travel in straight lines but they bend when they pass from one material into another such as air into glass. A magnifying glass bends lots of rays so that they all come to one point called the focus.

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What is the difference between an atom bomb and an hydrogen bomb ?

Atom bombs release lots of energy when billions of atoms are split by neutrons. Hydrogen bombs release energy when hydrogen atoms are smashed together by high temperatures.

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Explain why a feather and a hammer fall together when dropped side by side on the moon at the same time.

Although the feather and the hammer have different masses, they both accelerate at the same rate due to the gravity of the moon. There is no atmosphere on the moon so the friction force due to atmospheric drag is zero.

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What is heavy water ?

Water has 2 Hydrogen and 1 Oxygen atoms making up each molecule. If the Hydrogen atoms are replaced by heavier Hydrogen (deuterium) atoms, then each water molecule is slightly heavier. Hence the term heavy water which can be used in the Nuclear industry.

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Why is the grass green ?

The leaves of plants absorb most colours of light to make their food by photosynthesis. Leaves reflect the colour green so we see leaves as green.

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When is ... ?

[This is the answer to the question.]

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Copyright October 2008 KJ Healey