Which of these are used to produce an electric current?
Running water
Steam
Wind
All of these
To prevent electric shocks, the metallic electrical wires are covered with
paper
cotton
aluminium
plastic
A substance which allows electricity to pass through it is called
a conductor
an insulator
semiconductor
superconductor
Which of these is a set of good electrical insulators?
Graphite, wood, rubber
Rubber, glass. wood
Pure water, wood, silver
Copper, iron, silver
The device that makes contact between two terminals is called
Filament
Circuit
Switch
Cell
A battery is
a single cell
a combination of cells in which cells are joined (+) to (-)
a combination of cells in which cells are joined (+) to (+)
none of the above
An example of a conductor is
tap water
salt solution
metal wire
all of these
Which is an example of an insulator?
bakelite
Cell is a device which
converts chemical energy into electrical energy
electrical energy into light energy
electrical energy into magnetic energy
none of these
How many terminal are there is a dry cell?
One
Two
Three
Four
