1. Which of the following substances has the lowest electrical resistivity at room temperature?                                                              (Madhya Pradesh, Stage-I, 2012-13)

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3. An electric lamp whose resistance is 10 ohm, and a conductor of 2 ohm resistance are connected in series with a 6 V battery. The total current through the circuit and the potential difference across the electric lamp are

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4. When a body falls freely

  • Option : A
  • Explanation : (A) When a body falls freely, the potential energy due to its height converted into kinetic energy due to its motion.

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5. Heat energy of an object is

  • Option : B
  • Explanation : (B) Heat energy or thermal energy of an object is the total thermal kinetic energy and thermal potential energy of all its atoms and molecules. So, we can say that heat energy of an object is the total energy of the molecules of the object

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