100+ Physics Question and Answer for Competitive Exams - 3

Question: 11

What are the two types of cell?

They are primary cell and secondary cell.

Primary cell : The electrochemical cells make use of irreversible chemical reactions are called primary cells.

Example: Dry cell, Lechlanche cell.

Secondary cell : The electrochemical cell which make use of reversible reactions are called secondary cells.

Example: Lead acid accumulator and Nickel : Cadmium cell.

Question: 12

State the first law of Faraday's laws of electrolysis?

When an electric current cause's electrolysis, the mass of any substance liberated or dissolved is proportional to the total electric charge that passes.

Question: 13

State second law of Faraday's laws of electrolysis?

The masses of different substances liberated or dissolved by the passage of the same electric charge are in the ratio of their electrochemical equivalents.

Question: 14

What are the advantages of a filament lamp?

The filament lamb are made of an alloy of iron and nickel which has the same coefficient of the glass and prevents breakage of the bulb at high temperature.

5% of electric energy is converted into light.

The presence of inert gases like argon, neon reduce the evaporation of filament.