Available Answers

1. 1.

   Tick (√) the correct options:

   1. How many terminals are there in an electric cell?
      1. two
      2. three
      3. four
      4. five
   2. Which is not the source of electricity?
      1. generator
      2. power station
      3. battery
      4. fan
2. 2.

   Tick (√) the correct options:

   1. Electric current flows only when the circuit is _______________.
      1. open
      2. closed
      3. incomplete
      4. broken
   2. Which of the following is not an insulator?
      1. rubber
      2. wood
      3. copper
      4. plastic
3. 3.

   Tick (√) the correct options:

   1. Tiny thin wire inside the bulb that gives off light is called _______________.
      1. element
      2. filament
      3. circuit
      4. thread
   2. The flow of electricity is called electric _______________.
      1. energy
      2. power
      3. generator
      4. current
   3. The energy provided by electricity is called _______________ energy.
      1. electrical
      2. chemical
      3. solar
      4. physical
   4. The electric circuit that is not complete is called _______________ circuit.
      1. open
      2. closed
      3. short
      4. universal
   5. The device that is used to open or close an electric circuit is an _______________.
      1. electric bulb
      2. electric gadget
      3. electric switch
      4. electric cell
   6. When the switch of an electric torch is pushed to the 'on' position, the circuit is _______________.
      1. incomplete
      2. open
      3. complete
      4. none of these
4. 4.

   Look at the figures given alongside and tick (√) the correct options:

   

   1. In Fig. (a), the bulb does not glow because
      1. both wires are not intact
      2. both wires are intact
      3. wire 1 is broken
      4. wire 2 is broken
   2. In Fig. (b),
      1. the bulb will glow
      2. the bulb will not glow
      3. the bulb will glow for some time
      4. the bulb will fuse
   3. In Fig. (c)
      1. the bulb will glow
      2. the bulb will not glow
      3. the bulb will glow for some time
      4. the bulb will fuse
5. 5.

   Fill in the blanks:

   1. An electric cell is a source of _______________.
   2. An electric bulb glows, when _______________ passes through it.
   3. Metals are _______________ conductors of electricity.
   4. A bulb in which the filament is broken is called _______________ bulb.
   5. Among non-metals, _______________ is a good conductor of electricity.
6. 6.

   State whether the following statements are true (T) or false (F). Rewrite the false statements correctly:

   1. Electric cells have chemicals stored inside them.
   2. When current passes through the filament of a fused bulb, it glows.
   3. Electric cells supply a steady electric current.
   4. An electric switch is used to open or close an electric current.
   5. The path along which an electric current can flow is called an 'electric circuit' or 'circuit'.