Some Natural Phenomena Test

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Some Natural Phenomena Test - 27

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Question 1
1 / -0

What happens when you touch the water pipeline in the building during a thunderstorm?

A
Your body will conduct electricity

B
Charges will pass through your body

C
Your body provides earthing

D
All of the above

Solution

When we touch the water pipeline in the building during a thunderstorm, if a lightning strikes the building there may be a chance of getting electric shocks because water and our body, both are good conductors of electricity. As a result, charges pass through our body to the earth and get discharged over there. In other words, our body acts as an earthing to the building.
Question 2
1 / -0

Other than lightning conductor, what are the objects which indirectly protect building from lightning / thunderstorm?

A
Metal column used during construction.

B
Electrical wires in the building.

C
Water pipe in the building.

D
All of the above.

Solution

The metal columns used during construction, electrical wires and water pipes, all are good conductor of electricity and well earthed (connected to the ground) hence they provide earthing to the building by aiding in carrying the electric discharge to ground.
Question 3
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Why are lightning conductors pointed in shape?

A
To reduce mass.

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

C
It allows more current.

D
It repels the incident lightning discharge.

Solution

Pointed lightning conductors attract more charges because of the small cross-sectional area. When a charged cloud passes over the lightning rod, an opposite charge gets induced on it. As the surface area of the rod is very small, the surface density of charge is hence increased considerably. Consequently, the rod attracts the lightning without letting it fall on any other part of the building.
Question 4
1 / -0

A lightning conductor consists of

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

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

C
a conductor fixed on top of the building.

D
all of the above

Solution

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.

This provides a low resistance, conducting path for the electric discharge from the lightning to the earth.
Question 5
1 / -0

Rub a glass tumbler with wool. Bring an inflated charged balloon, rubbed with wool, near refill. Then

A
both balloon and tumbler will repel each other.

B
both balloon and tumbler attract each other.

C
no reaction will be observed.

D
the balloon will burst.

Solution

When rubbed by wool, glass tumbler becomes positive and rubber balloon becomes negative. Opposite charges attract. So, the balloon and the glass tumbler will attract each other.
Question 6
1 / -0

Clouds get electrically charged when :

A
The UV rays of sun falls on them

B
Air molecules rub against water molecules

C
Cold currents of air rub against hot currents of air

D
Both B and C

Solution

The heat from the sun and warm air cause water from water bodies to vaporize. These vapour accumulate in the sky to form clouds. When these vapour molecules rub against the air molecules or other vapour molecules, they acquire charge due to friction.
Lightning occurs when an electrical charge is built up within a cloud, due to static electricity generated by supercooled water droplets colliding with ice crystals near the freezing level. When a large enough charge is built up, a large discharge will occur and can be seen as lightning. The temperature of a lightning bolt can be five times hotter than the surface of the sun.

Both B and C are correct.
Option D
Question 7
1 / -0

Lightning is a more common phenomenon during rainy season because of:

A
high atmospheric density

B
high humidity

C
moderate temperature

D
solar electrostatic disturbances

Solution

During lightning, electrical discharge is between clouds and more clouds are formed in rainy season due to more humidity.
Question 8
1 / -0

Buildings are more susceptible to a lightning strike because

A
they are higher than their surroundings.

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

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

D
All of the above.

Solution

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.
Question 9
1 / -0

The spark seen inside a switch is:

A
electrical discharge

B
due to heating effect of current

C
an indicator glowing

D
a sudden fire

Solution

When a switch is put off, between two conducting plates inside, an electrical discharge occurs. This phenomenon is similar to lightning between the clouds. It's not uncommon to see a small spark coming from inside a switch when you turn it off. This is normal in most cases, and it doesn't indicate a problem. It's caused by a load arc that occurs when the electricity jumps between the contacts as they pull away from each other.
Question 10
1 / -0

The sparks caused due to friction between two machine parts are:

A
similar to lighting

B
not similar to lightning

C
lightning on a very small scale

D
none of the above

Solution

Lightning is an electrical discharge between clouds or cloud and ground due to accumulation of heavy amount of electrostatic charge. The sparks caused in machines due to friction are out of local heating and not connected to electrical discharge.

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Some Natural Phenomena Test - 27

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Some Natural Phenomena Test - 27

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SHARING IS CARING

Question 1

Your body will conduct electricity

Charges will pass through your body

Your body provides earthing

All of the above

Solution

Question 2

Metal column used during construction.

Electrical wires in the building.

Water pipe in the building.

All of the above.

Solution

Question 3

To reduce mass.

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

It allows more current.

It repels the incident lightning discharge.

Solution

Question 4

several sharp metal spiked connected to a thick copper strip.

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

a conductor fixed on top of the building.

all of the above

Solution

Question 5

both balloon and tumbler will repel each other.

both balloon and tumbler attract each other.

no reaction will be observed.

the balloon will burst.

Solution

Question 6

The UV rays of sun falls on them

Air molecules rub against water molecules

Cold currents of air rub against hot currents of air

Both B and C

Solution

Question 7

high atmospheric density

high humidity

moderate temperature

solar electrostatic disturbances

Solution

Question 8

they are higher than their surroundings.

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

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

All of the above.

Solution

Question 9

electrical discharge

due to heating effect of current

an indicator glowing

a sudden fire

Solution

Question 10

similar to lighting

not similar to lightning

lightning on a very small scale

none of the above

Solution

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