Tag: advanced of lightning

Questions Related to advanced of lightning

The lightening conductor is connected to interface with ground or "earth" through

physics some natural phenomena lightning conductors lightning safety advanced of lightning

  1. a cathode

  2. an anode

  3. an electrode

  4. a semiconductor

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Correct Option: C
Explanation:

Conductor cables carry lightening current from lightening rod to the ground. Since electrode is an electrical conductor. So, the answer is "an electrode".

                      is engineered to protect an elevated structure in the event of lightning strike.

physics some natural phenomena lightning conductors lightning safety advanced of lightning

  1. A lightning conductor

  2. Copper wire

  3. A lightening shield

  4. All of the above

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Correct Option: A
Explanation:

A lightening conductor is a metal rod mounted on a structure and designed to protect the structure from lightening strike. 

If the instantaneous current in a metallic wire is $i = \left( {5 + 10t} \right)A$ then find amount of charge flown through it from $t = 2s$ to $t = 3s$ is

physics some natural phenomena lightning conductors lightning safety advanced of lightning

  1. 10 C

  2. 20 C

  3. 30 C

  4. 40 C

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Correct Option: C
Explanation:

Given instantaneous current,

$i=(5+10t)A$
and from the definition of instantaneous current,  $i=\dfrac { dq }{ dt } $
$\Rightarrow \quad \left( 5+10t \right) =\dfrac { dq }{ dt } $
$dq=\left( 5+10t \right) dt$
Integrating implies,
$Q=5t+{ 5t }^{ 2 }$
At $t=2$,
                ${ Q } _{ 1 }=30C$
At $t=3$,
                ${ Q } _{ 2 }=60C$

$\therefore $  Option (C) is the correct option.

Where is the lower end of a lightning conductor fixed in the building?

physics some natural phenomena lightning conductors lightning safety advanced of lightning

  1. at the top

  2. at a window

  3. at the base

  4. in the ground

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Correct Option: A
Explanation:

a) It made from metal like Iron.
b) Its top end is pointed.
c) Obviously on the top of building far from any other metal.
d) It is placed below the ground with a copper plate.

How does lightning occurs between two charges within the cloud?

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

  1. When two negative charges grow large enough then a giant lightning sparks occurs

  2. When positive and negative charges grow large enough then a giant lightning sparks occurs

  3. When two positive charges grow large enough then a giant lightning sparks occurs

  4. None

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Correct Option: B
Explanation:

Build up of electrostatic charge in the clouds results in lightning. During this event, one region of the cloud is accumulated with positive charge whereas the other region is accumulated with negative charge.Hence when positive and negative charges grow large enough ,the air present being non-conductive no more resists the flow of charges and electric discharge can be seen in the form of giant lightning sparks.

What is the approximate lightning frequency?

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

  1. 1.4 billion flashes per year

  2. 1.4 billion flashes per month

  3. 1.5 billion flashes per year

  4. 1.6 billion flashes per year

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Correct Option: A
Explanation:

It is estimated that lightning strikes 40-50 times every second, i.e., almost 1.4 billion flashes per year.

What is meant by lightning?

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

  1. It is sudden electrostatic discharge during an electrical storm between electrically charged regions of cloud.

  2. It is sudden electrostatic discharge during an electrical storm between non-electrically charged regions of cloud.

  3. It is unsudden electrostatic discharge during an electrical storm between electrically charged regions of cloud.

  4. None of the above

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Correct Option: A
Explanation:

Lightning occurs when there is a build up of the electrostatic charge in clouds. Regions within the cloud, one builds up a positive whereas other builds up a negative charge.

Lightning is formed in unstable atmospheric zones where there is typically a lot of ____ and ______.

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

  1. Heat, moisture

  2. Heat, vapour

  3. Heat, gas

  4. Heat, lava

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Correct Option: A
Explanation:

Lightening is an extremely high voltage, high current, transient electrical discharge. It is most commonly caused by charge separation in cumulonimbus clouds, or "thunderheads". These type of clouds typically are very dynamic with strong ascending and descending air currents. They are formed in unstable atmospheric zones where there is typically lot of heat and moisture.

The layer of the earth's atmosphere which contains a high concentration of ions and free electrons and is able to reflect radio wave is known as

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

  1. Ionosphere

  2. Stratosphere

  3. Mesosphere

  4. Exosphere

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Correct Option: A
Explanation:

The layer of the earth's atmosphere which contains a high concentration of ions and free electrons and is able to reflect radio wave is known as the ionosphere.

Fill in the blank.
Static electricity produced by charged particles in the atmosphere is known as_______.

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

  1. Atmospheric electricity

  2. Atmospheric charge

  3. Cloud electricity

  4. Wind electricity

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Correct Option: A
Explanation:

Static electricity is an imbalance of electric charges within or on the surface of a material. The charge remains until it is able to move away by means of electric discharge. The static electricity produced by charged particles in the atmosphere is known as atmospheric electricity.