Tag: some natural phenomena

Quizzes (10) Questions (151)

Questions Related to some natural phenomena

Multiple choice physics some natural phenomena lightning conductors lightning safety advanced of lightning

Buildings are more susceptible to a lightning strike because

  1. they are higher than their surroundings.

  2. roofs of buildings are wet in rainy season and hence become good conductors of electricity.

  3. the top of the building is wet and acquires an opposite charge to a cloud passing over the top by induction.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Buildings are highly susceptible to a lightning strike because of the following reasons:

1. They are higher than their surroundings and closer to the clouds.
2. The roofs of buildings are wet in rainy season and hence become good conductors of electricity.
3. The top of the building is wet and acquires an opposite charge to a cloud passing over the top by induction.

Multiple choice physics some natural phenomena lightning conductors lightning safety advanced of lightning

Why are lightning conductors pointed in shape?

  1. To reduce mass.

  2. It attracts more electric charge due to very small radius and hence surface area.

  3. It allows more current.

  4. It repels the incident lightning discharge.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pointed lightning conductors attract more charge because of small cross sectional area. Surface density of charge is hence increased considerably.

Multiple choice physics some natural phenomena lightning conductors lightning safety advanced of lightning

A lightning conductor consists of

  1. several sharp metal spiked connected to a thick copper strip.

  2. a metal plate buried deep inside the ground connected to the ground end of copper strip.

  3. a conductor fixed on top of the building.

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A lightning conductor consists of a conductor fixed on top of the building. The conductor consists of several sharp metal spikes connected to a thick copper strip. The other end of the copper strip is fixed to a metal plate buried deep inside the ground. 

Multiple choice physics some natural phenomena lightning conductors lightning safety advanced of lightning

The lightning conductor used in building, protects the building by :

  1. dissipating the electric charge away from the building

  2. conducting the lightning safely to the ground

  3. absorbing the electric charge

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The lightning conductor used in building, protects the building by conducting the lightning safely to the ground.


Option B is correct.

Multiple choice physics some natural phenomena lightning conductors lightning safety advanced of lightning

Which of the following correctly represents the sequence of operations of isolator circuit breaker and earthing switch while opening a circuit :

  1. close earthing switch - open circuit breaker open isolator

  2. open isolator - close circuit breaker - open earthing switch

  3. open circuit breaker - open isolator - close earthing switch

  4. close circuit breaker - close isolator - open earthing switch
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Open circuit breaker - open isolator - close earthing switch represents the sequence of operations of isolator circuit breaker and earthing switch while opening a circuit.


Option C is correct.

Multiple choice physics some natural phenomena lightning conductors lightning safety advanced of lightning

What is the main function of lightning conductor?

  1. To capture lightning stroke and conduct discharge current safely to the ground

  2. To capture lightning stroke and conduct discharge current safely to the cloud

  3. To capture lightning stroke and conduct discharge current safely to the building

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A lightning rod conducts a positive charge up to meet the negative charge of a lightning strike, allowing the strike to hit the rod and travel through attached wires to an underground connection. This diverts the strike away from a building, preventing or lessening potential damage.


Option A is correct.

Multiple choice physics some natural phenomena lightning conductors lightning safety advanced of lightning


Which of the following correctly presents the sequence of operations of isolator circuit breaker and earthing switch while closing a circuit :

  1. Ensure circuit breaker is closed - close isolator - open earthing switch

  2. Ensure circuit breaker is open - close isolator - open earthing switch if any close circuit breaker

  3. Ensure circuit breaker is open - open isolator - open earthing switch if any close circuit breaker

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

 Ensure circuit breaker is open - close isolator - open earthing switch if any close circuit breaker .


Option B is correct.

Multiple choice physics some natural phenomena lightning conductors lightning safety advanced of lightning

An ordinary tube light used for lighting purposes contains :

  1. fluorescent material and an inert gas

  2. one filament, reflective material and mercury vapour

  3. fluorescent material and mercury vapour

  4. two filaments, fluorescent material and mercury vapour
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An ordinary tube light used for lighting purposes contains:

1. Two filaments
2. Mercury vapours
3. Fluorescent material

Option D is correct.