1. How an ant can see the objects all round?

It is due to the presence of compound eyes, one on each side
of the head. Each eye consists of tiny lenses set close
together. The number of lenses varies from fewer than 6 to
more than 1,000

2. What is the approximate time required for a heart beat?

72 heartbeats/60 sec so 1 heartbeat 1.2 sec

3. Due to which the energy emitted by the Sun?

its due to nuclear fusion no fission, two hydrogen nucliii
combine to form a single nucleus of Helium

5. Why the sky appears blue?

Because of scattering of light

6. What is the use of Dynamo?

It converts the mechanical energy in to electrical energy

9. Why does a big fire in the open appear to be fanned by strong winds?

The surrounding heated air rises and cool air rushes in to
create a fanning effect

10. How the Oil rises up the wick in a lamp?

It is because of the capillary action phenomenon

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