Available Answers

1. 1.

   Choose the most appropriate answer.

   1. The SI unit of energy is
      1. newton
      2. joule
      3. m/s
      4. m
   2. Kinetic energy of a moving body is proportional to
      1. its velocity
      2. square of its velocity
      3. cube of its velocity
      4. none of these
   3. Which of the following forms of energy are called mechanical energy?
      1. Sound energy and electrical energy
      2. Potential energy and kinetic energy
      3. Kinetic energy and light energy
      4. None of these
   4. Which of the following has both kinetic and potential energy?
      1. The elastic bond of a catapult about to hurl a stone
      2. A ball moving in slow motion across a ground
      3. A boy reading a book sitting on a chair
      4. None of these
   5. During photosynthesis, the energy conversion that takes place is
      1. solar energy into chemical energy.
      2. heat energy into potential energy.
      3. nuclear energy into chemical energy.
      4. none of these
   6. Which of the following is not true for energy?
      1. Energy has no mass.
      2. Energy does not occupy space.
      3. Energy can change from one form to another form.
      4. Energy is measured in newtons.
   7. Which type of energy conversion takes place when an electric bulb glows?
      1. Heat energy is converted to light energy.
      2. Electrical energy is converted to light energy.
      3. Chemical energy is converted to electrical energy.
      4. None of these
   8. Which of the following does not contain chemial energy?
      1. Starch (food made by plants)
      2. Fossil fuels
      3. Firecrackers
      4. Water stored in a dam
2. 2.

   Fill in the blanks.

   1. 1 calorie = ______________ joules
   2. The two forms of mechanical energy are _______________ energy and _____________ energy.
   3. The two forms of potential evergy are _______________ potential evergy and _______________ potential energy.
   4. Solar energy is converted into heat energy by ___________________.
   5. Electric heaters convert electrical energy into ___________________ energy.
   6. A loudspeaker converts _________________ energy into _________________ energy.
   7. Wind is caused by the _________________ from the Sun.
3. 3.

   Match the following.

   Column A	Column B
   1. water stored in a dam	a. elastic potential energy
   2. uranium	b. heat energy
   3. flowing water	c. gravitational potential energy
   4. spring of a watch	d. nuclear energy
   5. vibrating string of a sitar	e. kinetic energy
   6. coal	f. magnetic energy
   7. photosynthesis	g. sound energy
   8. magnets	h. chemical energy

    

4. 4.

   Define Energy.

5. 5.

   Define Calorie.

6. 6.

   Define Mechanical energy.