Melting and Solidification Quiz with Answers PDF Download – Test 25

MCQ 121: Melting occurs at a constant temperature for:

1. impure substances only
2. pure substances only
3. impure and pure substances both
4. none

MCQ 122: Among the four, the highest wavelength is of:

1. radio waves
2. infrared
3. ultraviolet
4. gamma rays

MCQ 123: Air is result of:

1. Magnetic force
2. electric force
3. contact force
4. gravitational force

MCQ 124: Latent heat of vaporization is:

1. the amount of heat required to raise the temperature of a 1 kg of a substance by 1 K
2. the amount of heat required to raise the temperature of a substance by 1 K
3. the amount of heat required to change the phase of a substance from solid to liquid without any change in temperature
4. the amount of heat required to change the phase of a substance from liquid to gas without any change in temperature

MCQ 125: Electromagnetic waves carry:

1. positive charge
2. negative charge
3. no charge
4. both positive and negative charge