Question

Choose the incorrect option. Expansion during heating:
(a) occurs only in a solid
(b) increase the density of the material
(c) decrease the density of the material
(d) occurs at the same rate for all liquids and gaseous

Answer 1

Hint: Thermal expansion in solids occurs due to change in length, but in the case of liquid and gases the expansion occurs in solid, liquid as well as gases

Complete step by step solution:
Expansion during heating is the process to change the volume of matter in response to change in temperature. During thermal expansion, the density of substance decreases as its volume increases.
Increase in volume-occupying a large space. The atoms of matter are distributed in larger spaces. But its mass does not change because the amount of matter contained in a body does not change.
Therefore, mass is divided by increased volume gives a decreased density, so the answer (c) is the correct option and answer (b) is incorrect but in the case of liquid during expansion 0 to 4 degree Celsius the density is increased so the answer (b) is also a correct option. Now read the option (a) expansion during heating occurs in solid, liquid as well as gases so the option (a) is incorrect.

So, the correct answer of this question is (a).

Note:
The kinetic energy of atoms is directly proportional to the temperature. In solids, the atoms or molecules are closely packed together, when we increase the temperature the Kinetic energy is also increased. Kinetic energy increases the velocity of particles. This increasing velocity of particles hits the molecule which increases the interatomic distance.