Available Answers

1. 1.

   Fill in the blank boxes in the energy mind map.

   

2. 2.

   Multiple Choice Questions (MCQs)

   1. In which case is the work done the most?
      1. Lifting a brick by 1 m
      2. Lifting a brick by 2 m
      3. Lifting two bricks by 1 m
      4. Lifting two brick by 2 m
   2. The energy of which of these comes from the sun?
      1. Coal 
      2. Petroleum
      3. Natural gas
      4. All of these
   3. Which of these sources of energy is non-renewable?
      1. Sun
      2. Wood
      3. Coal
      4. Wood
   4. Which of these directly converts the energy of the sun into electricity?
      1. Solar cooker 
      2. Solar water heater
      3. Solar cell
      4. All of these
   5. The energy obtained from of these is non-polluting?
      1. Coal
      2. Wood
      3. Wind
      4. Natural gas
3. 3.

   Fill in the blanks.

   1. When a force moves something ______________ is done.
   2. To do work, ______________ is required.
   3. A moving car has _______________ energy or ____________ energy.
   4. Energy of current flowing a wire is ______________ energy.
   5. Wood and coal can be burnt to get energy.They are _____________ .
   6. Electricity generated in dams built over rivers id called ___________ energy.
   7. ______________ sources of energy will never run out.
   8. Water is heated using the sun's energy in a ____________ heater.
4. 4.

   Match the columns

   Column A	Column B
   a. Primary source of most forms of energy	(i) Non-renewable
   b. Energy of a moving object	(ii) Dam
   c. Structure built on rivers to get electricity	(iii) Sun
   d. Sources of energy that, once used up, cannot be replaced	(iv) Motion energy

    

5. 5.

   Give one example for each of the following.

   1. Force is applied and work is done
   2. Force is applied but no work is done
6. 6.

   What is energy?