Tag: electric charges and fields

Quizzes (7) Questions (175)

Questions Related to electric charges and fields

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

From below which is the example of insulators.

  1. Metallic elements

  2. Non Metallic elements

  3. graphite

  4. acqueous solution of salt
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metallic elements have free electrons on the metallic surface and thus they are extremely good conductors. 


Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Graphite is structured into planes with tightly bound atoms. There is a great deal of distance between planes, and they are bonded weakly together, allowing the electrons to move around.

When a salt is added in water, it dissociates into respective ions and these collect on the cathode and anodes respectively and a current is maintained. 
Hence it is a conductor.

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

Until when does the charged particle transmits charge to other?

  1. Until the overall repulsive forces between electrons is minimised.

  2. Until the overall repulsive forces between electrons is maxmised.

  3. Until the overall repulsive forces between electrons is become neutral.

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Until the overall repulsive forces between electrons is minimised, the charged particle continues to transmit charge to other particles.


Option A is correct.

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

Earthing is provided in buildings to protect it form

  1. lightning

  2. leakage of electric current

  3. cyclone

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

Earthing means to connect electrical system to earth or soil in such a manner as it ensures an immediate discharge of electrical energy night out any danger. it is essentially done to product the building from any miss happening.

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

Ordinary rubber is an insulator. But the special rubber tyres of aircrafts are made slightly conducting. Why is this necessary?

  1. The charged developed due to atmospheric electricity finds its way to the earth

  2. The charged developed due to friction finds its way to the earth

  3. The charged developed due to induction finds its way to the earth

  4. The charged developed due to the aircraft engine finds its way to the earth
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ordinary rubber is an insulator. But the special rubber tyres of aircrafts are made slightly conducting. This is because during landing or takeoff, the tyres of aircrafts get charged due to friction between tyres and the ground. In such case, the tyres are slightly conducting, the charges developed on the tyres will not stay on them and find its way to earth.

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

State whether true or false:
Alcohol and ether are conducting liquids of electricity. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation


Ionic Liquids like alcohol and ether frequently share a number of attractive properties that distinguish them from conventional organic solvents, such as low (and even effectively-null) vapor pressure, a wide liquid range, low flammability, high conductivity (e.g., ionic, thermal), excellent stability (e.g., thermal, chemical, redox, radiochemical), a wide electrochemical potential window, and the ability to act as surprisingly good solvents towards many substances.
Ionic Liquids are a new class of purely ionic, salt-like materials that are liquid at unusually low temperatures.
Hence, the statement is true.

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

State whether true or false :

A piece of fresh potato does not conduct electricity at all.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

False.

A potato has the potential to conduct electricity because it is a source filled with electrolytes. These electrolytes act as an electrical conductor which means they allow the flow of electric charges.thus it will conduct electricity.