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Electric conductivity of metals

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Questions and Answers

What property of a substance is defined as the ability to restrict the flow of electricity?

Resistance (correct)

Insulation

Friction

Conductivity

Which of the following is NOT a good conductor of electricity?

Copper

Bakelite (correct)

Aluminium

Silver

What causes metals like silver, copper, and aluminium to be good conductors of electricity?

Presence of acids in the metals

Lack of electrons in the metals

Presence of free or loosely-attached electrons (correct)

High temperature of the metals

Substances that offer greater difficulty to the flow of electrons are known as:

Insulators Signup and view all the answers

Which of the following is a good insulator according to the text?

Hard porcelain Signup and view all the answers

What is the effect of freely moving electrons in a conductor when an electric potential difference is applied?

They collide with other atoms and electrons, producing heat. Signup and view all the answers

Which substance is mentioned as relatively poor conductors of electricity?

P.V.C. Signup and view all the answers

Which class of substances are good conductors of electricity?

Metals, acids, and salts solutions Signup and view all the answers

Why do silver, copper, and aluminium act as very good conductors of electricity?

They have a large number of free or loosely-attached electrons in their atoms Signup and view all the answers

What happens to the vagrant electrons in a conductor when an electric potential difference is applied?

They assume a directed motion Signup and view all the answers

What is the main result of the collision between flowing electrons and atoms/electrons in a conductor?

Production of heat Signup and view all the answers

Which of the following substances is NOT a good conductor of electricity?

Bakelite Signup and view all the answers

Among the following, which can be classified as good insulators?

$ ext{Paper}$ and cotton Signup and view all the answers

What is the property that substances like bakelite, mica, glass, and rubber exhibit in terms of conducting electricity?

$ ext{Insulating}$ Signup and view all the answers