Available Answers

1. 1.

   Write true or false for each statement:

   1. A man going up has potential energy and kinetic energy both.
   2. A gum bottle lying on a table has no energy.
   3. In electric fan, electrical energy changes into mechanical energy.
   4. Potential energy changes into kinetic energy when it is put to use.
   5. One form of energy cannot be converted into another form.
   6. There is always sone loss of energy in conversion from one form of energy to another form, so the total energy is not conserved.
   7. The energy of flowing water can be converted into electric energy (electricity).
2. 2.

   Fill in the blanks:

   1. An electric fan converts electrical energy into _____________ energy.
   2. Cooking gas converts _____________ energy into heat energy.
   3. Energy possessed by a compressed spring is _____________ energy.
   4. The ability to do work is called _____________.
   5. The energy possessed by a body due to its position is called _____________ energy.
   6.  The energy possessed by body due to is motion is called _____________ energy.
   7. Green plants convert _____________ energy into chemical energy.
   8. The S.I.unit of energy is _____________.
   9. An object falling freely from the roof of a multistory building has _____________ energy when halfway down the building.
3. 3.

   Match the following columns:

   Column A	Column B
   Running water  Burning  Energy  Sound energy  Nuclear energy	heat energy  vibrations  atom bomb kinetic energy  joule

4. 4.

   Select the correct alternatives:

   1. When we rub our hands:
   2. A ball rolling on the ground possesses:
   3. The energy stored in an electric cell is:
   4. When a bulb lights up on passing current, the change of energy is:
   5. The correct statement is:
   6. According to law of conservation of energy, energy changes from one form to another form, but the total energy of that system:
5. 5.

   Define the term energy.

6. 6.

   State the unit of energy and define it.