Thermal Energy MCQ (Multiple Choice Questions) PDF Download

The thermal energy required to change 1 kg of substance from liquid to vapor, or vice versa, without any change in temperature is known as

1. specific latent heat of fusion
2. latent heat of vaporization
3. latent heat of fusion of a solid
4. specific latent heat of vaporization

The mass of an ice bar is 200 g. If the specific latent heat of fusion of ice is 340 kJ, then what is the thermal energy required to melt?

1. 68 kJ
2. 98 kJ
3. 28 kJ
4. 38 kJ

The amount of thermal energy required to change 1 Kg of the solid to liquid, or vice versa, without any temperature change is known as

1. specific latent heat of fusion
2. latent heat of vaporization
3. latent heat of fusion of a solid
4. specific latent heat of vaporization

A heating fan supplies thermal energy at constant rate of 1000 W is immersed completely in a 2.5 Kg of block of ice at 0 °C. The ice block takes 1150 s to melt fully. What is the value for the specific latent heat?

1. 1.58 × 10⁵ J Kg^-1
2. 2.9 × 10⁵ J Kg^-1
3. 3.7 × 10⁵ J Kg^-1
4. 4.2 × 10⁵ J Kg^-1

The thermal energy required to change the substance from liquid to vapor state, or vice versa, without any temperature change is known as

1. specific latent heat of fusion
2. latent heat of vaporization
3. latent heat of fusion of a solid
4. specific latent heat of vaporization