Tag: physics

Questions Related to physics

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

physics some natural phenomena safety from lightning lightning safety advanced of lightning

  1. transformer

  2. transducer

  3. electrode

  4. lightning conductor

Show answer
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?

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  1. Metal column used during construction.

  2. Electrical wires in the building.

  3. Water piper in the building.

  4. All of the above.

Show answer
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.
physics some natural phenomena safety from lightning lightning safety advanced of lightning

  1. metallic rod, only positive

  2. plastic rod, only negative

  3. metallic rod, electric

  4. plastic rod, electric

Show answer
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?

physics some natural phenomena safety from lightning lightning safety advanced of lightning

  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.

Show answer
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.
physics some natural phenomena safety from lightning lightning safety advanced of lightning

  1. Thunder

  2. Rain

  3. Clouds

  4. All of the above

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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?

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  1. Open field

  2. Under tall trees

  3. Under short trees

  4. None of the above

Show answer
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?

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  1. Under a tree

  2. Near street light

  3. Elevated places

  4. None of the above

Show answer
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?

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  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

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Correct Option: A

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

physics some natural phenomena safety from lightning lightning safety advanced of lightning

  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,

Show answer
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?

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  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

Show answer
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.