Question

Match the following in column A with column B
$\begin{array}{cc}\text{A}& \text{B}\\ \text{(1) Thermal expansion of solids}& \text{(P) Working of automobile engines}\\ \text{(2) Thermal expansion of liquids}& \text{(Q) Gaps kept in between rails}\\ \text{(3) Thermal expansion of gases}& \text{(R) Working of thermometer}\end{array}$

• A. (1)-(P), (2)-(Q), (3)-(R)
• B. (1)-(Q), (2)-(R), (3)-(P)
• C. (1)-(R), (2)-(Q), (3)-(P)
• D. (1)-(Q), (2)-(P), (3)-(R)

Answer 1

The correct option is B (1)-(Q), (2)-(R), (3)-(P)

During summer season, the rails expands due to thermal expansion of solids. Therefore gaps are provided in between rails to avoid accidents.
Principle of thermal expansion of liquids is used in the working of thermometers. When temperature increases, the mercury level starts to rise and gives us appropriate readings.
In automobile engines, work is done by the thermal expansion of gases.