Available Answers

1. 1.

   State whether the following statements are true or false. Rewrite the false statement correctly.

   1. Flow of protons constitutes an electric current.
   2. Resistance is the obstruction to the flow of current.
   3. SI unit and commercial unit of electrical energy has no connection between them.
   4. A fuse wire has a high melting point.
   5. Overloading of electric current circuits can lead to short circuiting.
2. 2.

   Fill in the blanks

   1. When a short-circuit takes place, the fuse wire ________________ and breaks the ________________.
   2. The electric meter in our house measure electrical energy in ________________ or ________________.
   3. One kilowatt hour is equal to ________________ Joules.
   4. A fuse wire should have low ________________.
3. 3.

   Match the following:

   Electric power Resistance Electric current Electrical energy Electric charge Potential difference

   volt joule coulomb watt ampere ohm.

4. 4.

   Tick the most appropriate answer :

   1. Electric current is the flow of
      1. protons
      2. electrons
      3. neutrons
      4. none of the above
   2. Current is measured in
      1. joules
      2. watts
      3. volts
      4. amperes
   3. Potential difference is measured in
      1. joules
      2. volts
      3. watts
      4. amperes
   4. The unit for resistance is
      1. amperes
      2. joules
      3. volts
      4. ohms
   5. All wires used in electric circuits should be covered with
      1. a colouring material
      2. a conducting material
      3. an insulating material
      4. none of the above
   6. Electrical work done per unit time is
      1. electrical energy
      2. electric current
      3. electrical circuit
      4. electrical power
   7. One kilowatt is equal to
      1. 100 watts
      2. 1000 watts
      3. 10 watts
      4. none of the above
   8. Fuse wire is an alloy of
      1. tin-lead
      2. copper-lead
      3. tin-copper
      4. lead-silver
   9. A fuse wire should have
      1. A low melting point
      2. High melting point
      3. Very high melting point
      4. None of the above
   10. A bulb of 100 watt means. it will consume electrical energy at the rate of
       1. 100 joules per second
       2. 100 kJ per second
       3. 1000 joules per second
       4. 100 joules per minute
5. 5.

   Define electric current.

6. 6.

   Define electric power.