Which of these are used to produce an electric current?
Running water
Steam
Wind
All of these
The device that makes contact between two terminals is called
Filament
Circuit
Switch
Cell
Cell is a device which
converts chemical energy into electrical energy
electrical energy into light energy
electrical energy into magnetic energy
none of these
A substance which allows electricity to pass through it is called
a conductor
an insulator
semiconductor
superconductor
Which is an example of an insulator?
bakelite
aluminium
tap water
all of these
Bulb glows only in
closed circuit
open circuit
in both circuits
open circuit if bulb is not fused
To prevent electric shocks, the metallic electrical wires are covered with
paper
cotton
plastic
An example of a conductor is
salt solution
metal wire
Which of these is a set of good electrical insulators?
Graphite, wood, rubber
Rubber, glass. wood
Pure water, wood, silver
Copper, iron, silver
Filament of s bulb is made up of
chromium
platinum
tungesten
