Refraction through a Lens — Physics STD 10 — Question

Explain the motion of a planet around the sun in a circular path.

Name the three elementary particles present in an atom. Locate their positions.

Give two examples of nuclear fusion.

Give scientific reasons for the following:
A steam burn is usually worse than a hot water burn.

How does the wave pattern of a loud note differ from a soft note? Draw a diagram.

Name the material used for heating element of a room heater.

Draw a labelled diagram showing the three magnetic field lines of a loop carrying current. Mark the direction of current and the direction of magnetic field by arrows in your diagram.

In a three-pin plug top, one of the pins is thicker and longer than the other two, Give reason. Name this pin.

State two differences between a convex and a concave lens in their (a) appearence, and (b) action on the incident light.

Why should switches always be connected to the live wire? Give one precaution that should be taken while handling switches.