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Multiple choice physics some natural phenomena how lightning occurs? the story of lightning advanced of lightning

State whether the given statement is True or False :

Lightning conductor cannot protect a building from lightning.

  1. True

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

Answer is False.

The use of a lightning rod on a building protects the building by preventing the lightning strike. The idea is based upon the principle that the electric field strength is great around a pointed object. The intense electric fields surrounding a pointed object serve to ionize the surrounding air, thus enhancing its conductive ability. 
As a storm cloud approaches, there is a conductive pathway established between the statically charged cloud and the lightning rod. The static charges gradually migrate along this pathway to the ground, thus reducing the likelihood of a sudden and explosive discharge. 
The primary role of a lightning rod is to discharge the cloud over a longer length of time, thus preventing the excessive charge buildup that is characteristic of a lightning strike.
Hence, lightning conductor is a device to protect a building against lightning.

Multiple choice physics some natural phenomena how lightning occurs? the story of lightning advanced of lightning

Fill in the blanks:

During the development of a thunder-storm, the air currents move ________ while the water droplets move _______.

  1. downward, upward

  2. upward, downward

  3. downward, downward

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

Thunder-storm occurs due to vigorous movements of air currents upward and water droplets downward. This leads to separation of charges.

Multiple choice physics some natural phenomena how lightning occurs? the story of lightning advanced of lightning

It is safer to use mobile and cordless phone during lightning because?

  1. They are wireless

  2. Less chances of getting in contact with lightning

  3. Both a & b

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lightning can travels through the wires or cords of telephone giving electric shock to you but use of mobile and cordless phones are safe.