Tag: some natural phenomena

Questions Related to some natural phenomena

Why is a car or a bus safe place during lightening?

  1. Because it does not rain inside the bus.

  2. Because lightening cannot travel through the glass.

  3. Because a car or a bus is insulated from the Earth.

  4. None of the above.


Correct Option: C
Explanation:

A car or a bus stand on rubber tyres. Rubber being an insulator, the body of car / bus stays separated or insulated from the Earth. So, it does not attract lightening. If we take shelter in a car / bus during lightening, there is no chance to be hit by the lightening.

During lightning it is safer to_______?

  1. Take shelter under short trees

  2. Take shelter under tall trees

  3. Carry umbrella open

  4. Stand in open fileds


Correct Option: A
Explanation:

It is safe to take shelter under short tress when you have no option, Lightning mostly gets attracted by tall targets.

When you are in open field or open area and do not have any safe places to hide during thunderstorm what should be done?

  1. Make yourself smallest target.

  2. Squat low on the ground.

  3. Place your hands on your knees with head between the hands.

  4. All of the above.


Correct Option: D
Explanation:

During lightning make yourself smallest target by squat low on the ground and hands on your knees with your head between the hands. This is safe position.

Which of the following will not cause any harm to us during thunderstorm?

  1. Using phones with cord.

  2. Switching off electric light.

  3. Plugging in electrical appliances.

  4. All will cause harm.


Correct Option: B
Explanation:

During lightning switching off of electric lights does not cause any harm to us. Using phones with cord and plugging in electrical appliances may prove dangerous due to short circuiting  if a thunder strikes nearby.

Which of the following is permissible during a thunderstorm?

  1. Using a telephone having cord

  2. Using a mobile phone

  3. Taking a bath under running water

  4. Standing under a tree


Correct Option: B
Explanation:

It is safe to use mobile phones or cordless phones as there are no chance of electric shock due to lightning or thunder.

What should be the length of the metal rod used as lightning conductor?

  1. Shorter than the walls of the building.

  2. Same length or equals.

  3. Taller than the walls of the building.

  4. Nothing specific, can be of any length.


Correct Option: C
Explanation:

The lightning conductor should be taller than the walls of the building because lightning gets attracted to the taller targets.

The device that is used to protect buildings from the effects of lightning is:

  1. transformer

  2. transducer

  3. electrode

  4. lightning conductor


Correct Option: D
Explanation:

When a building is hit by lightning, the lightning conductor conducts all charges straight into the Earth thus protecting the building from damage.

Other than lightning conductor, what are the objects which indirectly protect building from lightning / thunderstorm?

  1. Metal column used during construction.

  2. Electrical wires in the building.

  3. Water piper in the building.

  4. All of the above.


Correct Option: D
Explanation:

The metal columns used during construction, electrical wires and water pipes, all are good conductor and well earthed hence provide earthing to the building.

The _______ provides easy route for the transfer of _______ charges to the ground.
  1. metallic rod, only positive

  2. plastic rod, only negative

  3. metallic rod, electric

  4. plastic rod, electric


Correct Option: C
Explanation:

Metals are good conductor of electricity and carry electric charges (both positive and negative) produced by lightning.

Why it is not recommended to touch water metal-pipe lines, electric wires during thunderstorm?

  1. They are good conductors thus may carry charges.

  2. They are insulators and never carry charges.

  3. They may store charges.

  4. This is a myth.


Correct Option: A
Explanation:

Metal pipe-lines for carrying water and electrical wires are good conductors and carry charges. If a lightning strikes the building, there may be chance of electric shocks getting spread through those due to leakage and this could be dangerous for life.