Class X

Specific latent heat of fusion is
1. Amount of heat required to raise temperature of a 1 kg of a substance by 1 K
2. Amount of heat required to change phase of a substance from solid to liquid without any change in temperature
3. Amount of heat required to change phase of a 1 kg of substance from solid to liquid without any change in temperature
4. Amount of heat required to change phase of a 1 kg of substance from liquid to gas without any change in temperature
_______ is a form of energy.
1. Force
2. Acceleration
3. Light
4. Speed
Periodic time of a simple pendulum depends on
1. The mass of pendulum bob
2. The collective mass of pendulum bob and thread
3. The length of pendulum
4. None of above
An object is lifted 5 m above levelled ground, mass of object is 20 kg and gravitational pull is 10 N kg-2, Ep of object is
1. 40 J
2. 1000 J
3. 2.5 J
4. 0.4 J
A piece of carbon of mass 0.40 kg requires thermal energy of 20 J to get heated from a temperature of 5 °C to 9 °C, specific heat capacity of carbon would be
1. 1.25 J kg-1 °C-1
2. 12.5 J kg-1 °C-1
3. 125 J kg-1 °C-1
4. 1250 J kg-1 °C-1
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