Heat Capacity: Physics MCQ with Answers PDF Download – Test 156

MCQ 776: Specific heat capacity of copper is:

1. 100 J kg^-1 °C^-1
2. 200 J kg^-1 °C^-1
3. 300 J kg^-1 °C^-1
4. 400 J kg^-1 °C^-1

MCQ 777: Latent heat of fusion 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 778: If the temperature increases, the speed of sound:

1. also increases
2. decreases
3. remains same
4. may increase or decrease

MCQ 779: An elevator motor is used to lift 1000 N load to a height of 0.25 km. If the total amount of energy input is 1MJ, which of the following pairs of values of energy wasted and efficiency are correct?

1. Energy wasted = 750 kJ, Efficiency = 75 %
2. Energy wasted = 500 kJ, Efficiency = 75 %
3. Energy wasted = 500 kJ, Efficiency = 25 %
4. Energy wasted = 750 kJ, Efficiency = 25 %

MCQ 780: SI unit for length is:

1. centimeter
2. inches
3. meter
4. yards