Tag: seismic waves and tsunami

Questions Related to seismic waves and tsunami

Which among the following is the best conductor of electricity?

physics some natural phenomena transfer of charge lightning safety seismic waves and tsunami

  1. Oxygen

  2. Aluminium

  3. Carbon

  4. Wood

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Correct Option: B
Explanation:

Among oxygen, carbon, aluminium and wood, aluminium is a metal while others are non-metals. Metals are good conductors of electricity.

What happens when the lower end of the lightning conductor is not properly buried in the ground?

physics some natural phenomena transfer of charge lightning safety seismic waves and tsunami

  1. No earthing

  2. Building are protected

  3. Damage building and even life

  4. Both a & c

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Correct Option: D
Explanation:

Earthing is important to protect building from lightning. If proper earthing is not provide than it can damage building and dangerous for life also.

State whether given statement is True/False ?
Lightning conductor is made up of copper.

physics some natural phenomena transfer of charge lightning safety seismic waves and tsunami

  1. True

  2. False

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Correct Option: A
Explanation:

Copper wires allow electric current to flow without much loss of energy. Hence, copper is a good conductor of heat and electricity. This is why copper wires are used in mains cables in houses and underground. And, a thick copper strip is used for lightning conductors on tall buildings like church spires.

Why earthing is important?

physics some natural phenomena transfer of charge lightning safety seismic waves and tsunami

  1. To protect us from electrical shocks.

  2. Transfers charge from a charged body to the Earth.

  3. Both A and B.

  4. Neither A nor B.

Show answer
Correct Option: C
Explanation:

Earthing is the process of transferring charges to the Earth. During lightning, if earthing is not proper, we will get electrical shocks if lightning strikes.

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

physics some natural phenomena transfer of charge lightning safety seismic waves and tsunami

  1. Run to an open field

  2. Open an umbrella for cover

  3. Take shelter under trees

  4. Squat low on ground

Show answer
Correct Option: D
Explanation:

Squat low on ground is safest way to protect yourself from lightning.

A lightning conductor is made up of:

physics some natural phenomena transfer of charge lightning safety seismic waves and tsunami

  1. copper

  2. glass

  3. ebonite

  4. wood

Show answer
Correct Option: A
Explanation:

The main attribute common to all lightning rods is that they are all made of conductive materials, such as copper and aluminum. Copper and its alloys are the most common materials used in lightning protection. 
A lightning conductor is a metal rod or strap connecting the highest point on a building to the earth. Its purpose is to protect the building from a damaging discharge of electricity between the atmosphere and the building, that is, a lightning strike. 

Which of the following is the best thing to do during heavy lightning ?

physics some natural phenomena transfer of charge lightning safety seismic waves and tsunami

  1. Lying on the ground in an open place

  2. Going into the nearest water body

  3. Staying indoors away from metallic doors or windows

  4. Standing under a tall tree

Show answer
Correct Option: C

When you touch a charged body, the charge flows through you into the earth. This is called

physics some natural phenomena transfer of charge lightning safety seismic waves and tsunami

  1. induction

  2. conduction

  3. capacitance

  4. earthing

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Correct Option: D
Explanation:

$Answer:-$ D
when a wire  connecting circuit is connected to earth than it is known as earthing, if you touch circuit actually you behave like that wire and entire charge passes through your body and you will feel shock. Human body is good conductor of electricity. 

Lightning occurs because of :

physics some natural phenomena transfer of charge lightning safety seismic waves and tsunami

  1. rain

  2. electric discharge

  3. wind

  4. shaking of earth

Show answer
Correct Option: B
Explanation:

Answer is B.

Lightning occurs because of electric discharge.
Lightning is one of the most powerful natural forces on the planet. It is a natural discharge of the static electricity built up in storm clouds. Most lightning is formed as a part of thunderstorms. We know from observation of static electricity that static electrical discharges such as lightning are caused by separation of charges into positive and negative ions. Over time more of one charge builds until its natural attraction to the opposite charge causes it to migrate in an electrical discharge.

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

physics some natural phenomena transfer of charge lightning safety seismic waves and tsunami

  1. To run to an open field.

  2. To open an umbrella for cover.

  3. To take shelter under a tree.

  4. To squat low on ground.

Show answer
Correct Option: D
Explanation:

Though none of the given options show a perfect way of protection against lightning, squating low on ground is a better choice from the remaining options. Squating low on ground decreases surface area of body open to the atmosphere. So, chances of getting struck is less as compared to other cases.