Lesson 3 Thermal Physics

Q1. The increase in length of a solid on heating is called:

Linear expansion Areal expansion Cubical expansion Thermal conduction

Q2. A gas is heated from 300 K to 600 K at constant pressure. Its volume becomes:

Double Half Unchanged Four times

Q3. What is the approximate value of the universal gas constant?

8.31 J mol⁻¹ K⁻¹ 1.38 J mol⁻¹ K⁻¹ 9.8 J mol⁻¹ K⁻¹ 6.02 J mol⁻¹ K⁻¹

Q4. The SI unit of temperature is kelvin.

Kelvin Celsius Joule Newton

Q5. What is 27°C in kelvin?

300 K 246 K 273 K 310 K

Q6. During the day, sea breeze generally blows:

From sea to land From land to sea Top to bottom In all directions

Q7. What is absolute zero approximately on the Celsius scale?

−273°C 0°C 273°C −100°C

Q8. Which is the basic heat equation?

Q = mcΔT Q = m/cΔT Q = c/mT Q = m+c+T

Q9. Heat is energy transferred because of a temperature difference.

Heat Mass Pressure Density

Q10. Latent heat of fusion is the heat required to:

Melt unit mass of a solid Vaporize unit mass of a liquid Raise temperature by 1°C Cool a gas