. Write true or false for each statement:
(a) A fuse wire has a high melting point.
Answer. False.
(b) Flow of protons constitutes electric current.
Answer. False.
(c) Silver is an insulator of electricity.
Answer. False.
(d) S.I. unit and commercial unit of electrical energy are same.
Answer. False.
(e) Overloading of electric current in circuits can lead to short circuiting.
Answer. True.
(f) Our body can pass electricity through it.
Answer. True.
(g) All metals are insulators of electricity.
Answer. False.
(h) The earth wire protects us from an electric shock.
Answer. True.
(i) A switch should not be touched with wet hands.
Answer. True.
(j) AH electrical appliances in a household circuit work at the same voltage.
Answer. True.
(k) In a cable, the green wire is the live wire.
Answer. False.
(l) A fuse is connected to the live wire.
Answer. True.
(m) A switch is connected to the neutral wire.
Answer. False.
2. Fill in the blanks
(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 are 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 low melting point.
3. Match the following
4. Select the correct alternative
(a) All wires used in electric circuits should be covered with
colouring material
conducting material
an insulating material
none of the above
(b) Electric work done per unit time is
electrical energy
electric current
electric voltage
electrical power
(c) One kilowatt ¡s equal to
100 watt
1000 watt
10 watt
none of these
(d) Fuse wire is an alloy of
tin-lead
copper-lead
tin-copper
lead-silver
(e) A fuse wire should have
a low melting point
high melting point
very high melting point
none of the above
(f) When switch of an electric appliance is put off, it disconnects
the live wire
the neutral wire
the earth wire
the live and the neutral wire
(g) The purpose of an electric meter in a house is
to give the cost of electricity directly
to give the consumption of electrical energy
to safeguard the circuit from short circuiting
to put on or off the mains.
(h) If out of the two lighted bulbs in a room, one bulb suddenly fuses, then
other bulb will glow more
other bulb will glow less
other bulb will also fuse
other bulb will remain lighted unaffected.
No comments:
Post a Comment