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IGCSE O Level Physics Practice Test 25

# Melting and Solidification Quiz Questions and Answers PDF - 25

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## Melting & Solidification Quiz Answers : Test 25

MCQ 121: Melting occurs at a constant temperature for

A) impure substances only
B) pure substances only
C) impure and pure substances both
D) none

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

B) infrared
C) ultraviolet
D) gamma rays

MCQ 123: Air is result of

A) Magnetic force
B) electric force
C) contact force
D) gravitational force

MCQ 124: Latent heat of vaporization is

A) the amount of heat required to raise the temperature of a 1 kg of a substance by 1 K
B) the amount of heat required to raise the temperature of a substance by 1 K
C) the amount of heat required to change the phase of a substance from solid to liquid without any change in temperature
D) 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

A) positive charge
B) negative charge
C) no charge
D) both positive and negative charge

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