Various Forms of Energy : The Law of Conservation of Energy MCQ

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• For a freely falling body, which of the following quantities will not change?
  ক

  Total kinetic energy

  খ

  Total potential energy

  গ

  Total mechanical energy

  ঘ

  Insufficient data
• When a person intakes 3000 kcal of food, he is able to do work requiring energy of 2500 kcal. This means that the human body destroys a fraction of energy obtained from food.
  ক

  True

  খ

  False
• When a roller coaster is at the top of a steep hill, its potential energy is maximum. When it hurdles down the slope and comes to the bottom, the potential energy reduces greatly. Hence we can say that the law of conservation of energy is not valid here since energy is destroyed.
  ক

  True

  খ

  False
• Fire is a form of _____
  ক

  solar energy

  খ

  thermal energy

  গ

  gravitational energy

  ঘ

  kinetic energy
• The maximum potential energy in a roller coaster is at _____
  ক

  the top of the steep climb

  খ

  somewhere during the climb

  গ

  somewhere during the descent

  ঘ

  the lowest point after the climb
• The energy possessed by an object because of its motion is termed _____
  ক

  potential energy

  খ

  kinetic energy

  গ

  nuclear energy

  ঘ

  solar energy
• The law of conservation of energy is not applicable to mechanical systems as they require energy input to keep working.
  ক

  True

  খ

  False
• Which of the following statements are true?
  ক

  Energy can be created and destroyed

  খ

  Energy cannot be created but only destroyed

  গ

  Energy cannot be destroyed but only created

  ঘ

  Energy can neither be created nor destroyed