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Question

Fill in the blanks:

(a) The unit in which we pay the cost of electricity is ___

(b) The electrical energy consumed in a house is measured by ___

(c) In a household electrical circuit, the appliances are connected in ___ with the mains.

(d) A switch is connected to the ___ wire.

(e) The red colour insulated wire in a cable is the ___ wire.

(f) One kilowatt hour is equal to ___ joule.

(g) A fuse wire should have low ___.


Solution

(a) The unit in which we pay the cost of electricity is kWh.
(b) The electrical energy consumed in a house is measured by kWh meter.
(c) In a household electrical circuit, the appliance is connected in parallel with the mains.
(d) A switch is connected to the live wire.
(e) The red colour insulated wire in a cable is the live wire.
(f) One kilowatt hour is equal to 3.6 x 106  joule.
(g) A fuse wire should have a low melting point.

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Physics
Q1.

Select the correct alternative:

(a) All wires used in electric circuits should be covered with:

      (i) colouring material

      (ii) conducting material

      (iii) an insulting material

      (iv) none of the above.

(b) Electrical work done per unit time is:

      (i) electrical energy

     (ii) electric current

     (iii) electric voltage

     (iv) electric power

(c) One kilowatt is equal to :

      (i) 100 watt                     (ii) 1000 watt

      (iii) 10 watt                      (iv) none of the these.

(d)  Fuse wire is an alloy of :

       (i) tin-lead                  (ii) copper-lead

       (iii) tin-copper             (iv) lead-silver

(e) A fuse wire should have :

       (i) a low melting point

      (ii) high melting point

     (iii) very high melting point

     (iv) none of the above.

(f) When the switch of an electric appliance is put off, it disconnects: 

    (i) the live wire

    (ii) the neutral wire

    (iii) the earth wire

    (iv) the live and the neutral wires.

(g) The purpose of an electric meter in a house is :

      (i) to give the cost of electricity directly

      (ii) to give the consumption of electrical energy

      (iii) to safeguard the circuit from short circuiting

      (iv) to put on or off the mains.

(h)  If out of the two lighted bulbs in a room, one bulb suddenly fuses, then:

       (i) other bulb will glow more

       (ii) other bulb will glow less

       (iii) other bulb will also fuse

       (iv) other bulb will remain lighted unaffected.

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