5. Lightning conductors are made –
(a) of metal (b) of non-metal
(c) by painting the walls (d) of wood
Fill in the blanks –
(a) The materials that allow electric current to pass through them are called ……….. of electric current. [conductors ]
(b) Like charges………….each other, while unlike charges ………. each other. [repel , attract]
(c) The mechanism used to protect the buildings from lightning is called ………..[lightning conductor.]
(d) When two objects are rubbed with each the nature of the charges produced on them is …………[opposite]
Give reasons –
(a) When the television is switched on or off, a crackling sound is produced if a hand is placed on the screen of the television.
The rubbing of the hand against the screen generates static electricity.The discharge of static electricity between the hand and the screen produces the crackling sound.
Write the names of two conductors and two insulators for electricity.
Conductors: Copper , Aluminum
Insulators: Rubber , Glass
