Tag: conductors and insulators

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Questions Related to conductors and insulators

Multiple choice physics electric charges and fields conductors and insulators introduction to electrostatics electricity

Metals are good conductors because

  1. Outer electrons are strongly bound to the atom.

  2. Outer electrons are loosely bound to the atom.

  3. Inner electrons are loosely bound to the atoms.

  4. Protons can detach from the nucleus and conduct electricity.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metals have loosely bound outer electrons that is they have charge carriers which can move easily (current) when a potential difference is applied. Therefore, these loosely bound outer electrons make metals good conductors. 

Multiple choice physics electric charges and fields conductors and insulators introduction to electrostatics electricity

Why is electrical wiring usually made from copper and not silver?

  1. Copper is a better conductor

  2. Copper is a better insulator

  3. Copper is less expensive

  4. Copper is non magnetic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Silver is a better conductor, non magnetic but expensive material compared to copper therefore copper is generally used for electrical wiring.

Multiple choice physics electric charges and fields conductors and insulators introduction to electrostatics electricity

An electrolyte is :

  1. a cell

  2. a metal

  3. a liquid that conducts electricity

  4. sugar
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Answer is C.
An Electrolyte is a substance that dissociates into ions in solution and acquires the capacity to conduct electricity. Sodium, potassium, chloride, calcium, and phosphate are examples of electrolytes, informally known as lytes. 
Therefore, it a liquid that conducts electricity.
Multiple choice physics electric charges and fields conductors and insulators introduction to electrostatics electricity

Some materials have electrons that are tightly bound to the nucleus and are not free to travel within the substance. These materials are called .............

  1. conductors

  2. insulators

  3. semiconductors

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Some materials have electrons that are tightly bound to the nucleus and are not free to travel within the substance. These materials are called insulators.
An electrical insulator is a material whose internal electric charges do not flow freely, and therefore make it very hard to conduct an electric current under the influence of an electric field.

Multiple choice physics electric charges and fields conductors and insulators introduction to electrostatics electricity

Which one of the following is an insulator?

  1. nichrome

  2. graphite

  3. human body

  4. bakelite
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Answer is D.

Bakelite, or polyoxybenzylmethylenglycolanhydride, is an early plastic. It is a thermosetting phenol formaldehyde resin, formed from an elimination reaction of phenol with formaldehyde. It was developed by Belgian-born chemist Leo Baekeland in New York in 1907.
One of the first plastics made from synthetic components, Bakelite was used for its electrical nonconductivity and heat-resistant properties in electrical insulators, radio and telephone casings, and such diverse products as kitchenware, jewelry, pipe stems, firearms, and children's toys.
If the Bakelite is dry, it won't conduct electricity, however if it is wet and a high enough voltage is applied to it, it might conduct electricity.

Multiple choice physics electric charges and fields conductors and insulators introduction to electrostatics electricity

Which one of the following is bad conductor of electricity ?

  1. Acid

  2. Coal

  3. Distilled water

  4. Human body
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Distilled water  is bad conductor of electricity.


Distilled water does not contain any dissolve ions which conduct electricity by acting as a carrier of electric charge and hence they do not conduct electricity.

Option C is correct.

Multiple choice physics electric charges and fields conductors and insulators introduction to electrostatics electricity

Choose the appropriate option:
In metals______ than the insulators. 

  1. There are more free electrons

  2. There are less free electrons

  3. There are all free electrons

  4. There are no free electrons
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metals have electronic configuration such that there is always one, two or three electrons present which lie in the outer most shell and are loosely bounded. Therefore, in metals there are always more free electrons. 

Multiple choice physics electric charges and fields conductors and insulators introduction to electrostatics electricity

Materials which allow larger currents to flow through them are called :

  1. insulators

  2. conductors

  3. semiconductors

  4. alloys
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The current does not flow through the insulators. We know that a large amount of current will flow through the conductor due to the presence of free electrons. Relatively small amount of current also flow through semiconductors or some alloys.