Heat Capacity: Physics Multiple Choice Questions (MCQs) PDF Download - 156

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

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

If the temperature increases, the speed of sound

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

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 %

SI unit for length is

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