Tag: electricity

Questions Related to electricity

An example in which light emitting diodes are used is :

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

  1. calculator

  2. hard drive

  3. optical drive

  4. analog watch

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Correct Option: A
Explanation:

Light emitting diodes are used in calculators.


Option A is  correct.

Most solid materials are classified as insulators why?

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

  1. They offer large resistance to the flow of electric current

  2. They doesnt do anything

  3. They offer large force to other particles

  4. None

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Correct Option: A
Explanation:

Most solid materials are classified as insulators because they offer large resistance to the flow of electric current. because they do not have free electrons.


Option A is correct.

From below which of them are used in electrostatic experiments and demonstrations?

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

  1. Conductors

  2. Insulators

  3. Semi Conductors

  4. None

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Correct Option: B
Explanation:

Insulators are the materials that do not allow free flow of electrons from atom to atom and molecule to molecule. Subsequently charge is seldom distributed evenly across the surface of an insulator while, insulators are not used for transferring a charge, they do serve a critical role in electrostatic experiments and demonstrations.

Lightning wants to get to ground. It will follow the path(s) of                 to do so.

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

  1. most impedance

  2. least impedance

  3. least distance

  4. least inductance

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Correct Option: B
Explanation:

Lightening gets to the ground if the charges flow from lightening to the ground. It happens when these charges follow a path of least impedance. 

During discharging of a charged glass rod via earthing, the connecting material can be

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

  1. another glass rod

  2. a conducting wire

  3. fur

  4. an ebonite rod

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Correct Option: B
Explanation:

During discharging of a charged glass rod via earthing the connecting material should be such that it allows charge to flow through them easily. Such a material is a conductor. So, the connecting material can be a conducting wire. 

A charged glass rod will get discharged on

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

  1. connecting it to the earth

  2. connecting it to another glass rod

  3. breaking the ends of the rod

  4. Any of the above

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Correct Option: A
Explanation:

A charged glass rod can be discharged by connecting it to the ground (i.e, earthing it) via a conducting wire. In this way, charge from glass rod will flow to the ground via the conducting wire. 

Gases are good conductors of electricity at :

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

  1. low pressure 

  2. high pressure

  3. low temperature 

  4. high temperature 

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Correct Option: A,D
Explanation:

At room temperature, conductivity is less because of obstruction from other ions.
At low pressure, this disturbance is reduced and hence gases become good conductors.