Class X

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
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
_______ is a form of energy.
  1. Force
  2. Acceleration
  3. Light
  4. Speed
 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
 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
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