Which of these are used to produce an electric current?
Running water
Steam
Wind
All of these
Bulb glows only in
closed circuit
open circuit
in both circuits
open circuit if bulb is not fused
A bulb has
two terminals and a filament
two terminals and two filaments
multiple terminals and single filament
single terminal and a filament
Which is an example of an insulator?
bakelite
aluminium
tap water
all of these
A substance which allows electricity to pass through it is called
a conductor
an insulator
semiconductor
superconductor
An example of a conductor is
salt solution
metal wire
An electric current flows if there is
Source of electric current
A source of electric current and a metal wire
A source of electric current, a conducting wire connected in an unbroken one terminal of the source a bulb and a conducting wire connected to the other terminal of the electric source.
All the conditions given above are true.
Filament of s bulb is made up of
chromium
platinum
tungesten
To prevent electric shocks, the metallic electrical wires are covered with
paper
cotton
plastic
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