Chemical Effects of Electric Current

Which of the following is responsible for the flow of current through a metallic conductor?

• Valence electrons

• Lone pair of electrons

• Free electrons

• None of the above

Electrons move easily in

• insulators

• conductors

• capacitors

• none of the above

Substances having very large number of free electrons, which can be drifted in a particular direction by applying potential difference , are called

• Insulators

• Bad conductors

• Good conductors

• Semiconductors

A/ An ________ is used to provide electricity to the bulb in a torch .

• electric switch

• electric motor

• electric cell

• screw driver

The thin wire attached in the centre of a bulb is called _________

• filament

• electric cell

• torch

• electrode

The lower part of a bulb is called _____.

• metal

• apex

• base

• armature

The electrolyte used to electroplate Cu on the spoon is

• CuSO4

• AgNO3

• ZnSO4

• None of the above

An electrolyte is a compound which in its molten or aqueous state conducts an electric current by decomposing the current.

• True

• False

A crystal of NaCl can conduct electricity.

• True

• False