Question

1. Draw two diagrams to show what happens to the same bimetallic strip when it is:
(a) heated in a flame
(b) cooled in a freezer

2. What happens to the hole in a metal washer when the washer is heated? Does the hole get bigger, smaller or stay the same size?

3. Why will a hot, thick glass beaker shatter if plunged into cold water?

4. How will the expansion of the pendulum affect the running of a grandfather clock with a metal pendulum?

Answer 1

Explanation:

Since copper expands more than invar therefore, therefore side of copper will become convex and side of invar will become concave therefore bimetallic strip will bend upwards and upward circuit will be short and therefore bell and lamp will turn on.

Hence option