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Safety from lightning - class-VIII

Description: safety from lightning
Number of Questions: 18
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Tags: some natural phenomena analysis of natural phenomena physics static electricity
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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.

________ is the indication to rush for safer place.
  1. Thunder

  2. Rain

  3. Clouds

  4. All of the above


Correct Option: A
Explanation:

Hearing thunder is an alert to rush to a safer place. It could be dangerous to be out during thunderstorm.

When you are in forest during lightning which is safe place?

  1. Open field

  2. Under tall trees

  3. Under short trees

  4. None of the above


Correct Option: C
Explanation:

Lightning get attracted towards the tallest target, in forest it is good idea to take shelter under short trees to protect yourself from lightning.

If you are travelling by car during thunderstorm which place is safe?

  1. Under a tree

  2. Near street light

  3. Elevated places

  4. None of the above


Correct Option: D
Explanation:

It is better to remain in car, as it provides earthing to charges without harming you.

How lightning conductor is installed during construction of building?

  1. By keeping one end of rod open to air and another end of the rod buried deep in the ground.

  2. By keeping one end of rod closed and other end is buried deep in the ground.

  3. By keeping one end of rod open to air and other end is just touching the ground.

  4. None of the above


Correct Option: A

Why shouldn't one stand under a tree or a tall building during a thunderstorm?

  1. Lightning can strike trees and buildings,

  2. Trees and buildings may fall causing damage,

  3. Trees and buildings do not offer enough escape ground,

  4. None of the above,


Correct Option: A
Explanation:

Sometimes electric discharge can take place between the charged cloud and Earth. While passing over a tree or a tall building an opposite charge may be induced causing a lightning to strike the tree or a building and if the charge is large it may cause severe damage and may prove to be fatal. Thus, it is advised to stay away from tall buildings or tree during thunderstorms.

How can we be safe when there is occurrence of lightning?

  1. Taking shelter under building or house

  2. When travelling through car or bus, making sure windows and doors are shut

  3. If in forest, taking shelter under short trees

  4. All of the above


Correct Option: D
Explanation:

During lightning, we can be safe:

  • by taking shelter under buildings.
  • by ensuring that windows and doors of a car are shut while travelling in a car / bus.
  • by taking shelter under short trees while in forest.

Explore and answer :
Some children are playing in the playground. Suddenly clouds gather in the sky and there is thunder and lightning. What should they do now?
The children should_______.
Choose the correct answer.

  1. Run to their houses 

  2. Stand under a tree

  3. Just stand at their places 

  4. Squat down


Correct Option: A

Which of the following is safest way to protect yourself from lightning?

  1. Run to an open field

  2. Open an umbrella for cover

  3. Take shelter under a tree

  4. Squat low on ground


Correct Option: D
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