Question

Which of the following will show the least effect of thermal expansion?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

Railway track is made up of steel.
Also, the rim mounted over a wheel of bullock cart is made up of steel.
The electric wires are made up of good conductors like copper or aluminium.
The pendulum of a clock is made up of invar which is an alloy of iron and nickel that has a negligibly small coefficient of linear expansion.
Smaller the value of coefficient of linear expansion of a material, lesser will be the effect of thermal expansion seen in that material.
Out of all the options provided, the pendulum of the clock uses a material with lowest value of coefficient of linear expansion and hence will show least effect of thermal expansion.