The design of the thermostat of the electric iron is based on
A
apparent expansion of a body
B
thermometric effect
C
change in the density of a body when heated
D
expansion of metals when heated
Verified Correct Answer: D.
Physical Principles & Numerical Solution
The thermostat of an electric iron uses a bimetallic strip. This works on the principle that different metals expand by different amounts when heated, causing the strip to bend and break (or make) the circuit.
Source: Myschool Past Questions Archive (Record #78281)