Some Natural Phenomena Test

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Some Natural Phenomena Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Can the lightning rods be made of any material?

A
Yes

B
No, it can only be made of metals.

C
No, it can be made with any type of bodies with neutral charge

D
None of these

Solution

It should be of a metallic object so that it can conduct the charge. Any material won't be able to conduct charge. For example, aluminium rods are perfect.
Question 2
1 / -0

_______ is nature's most powerful display of static electricity.

A
Current electricity

B
Lightning

C
Conduction

D
Induction

Solution

Lightning is a natural phenomenon, which occurs when two clouds strike with each other and produce huge amount of electricity.
Hence lightning is nature's most powerful display of static electricity.
Question 3
1 / -0

If we rub our dry forearm with a silk cloth, the hairs on the forearm will stand straight. This is because:

A
of the attraction force between the hairs and the cloth.

B
of the charge acquired to the forearm due to rubbing.

C
of the magnetic field created due to rubbing.

D
none of the above.

Solution

When the forearm is rubbed with a cloth of silk, the dry forearm acquires positive charge. So, all the hairs there acquire same positive charge and repel each other. Thus the hairs stand straight after rubbing.
Question 4
1 / -0

Which of the following descriptions apply to a lightning conductor?

A
It is usually fixed at the top of tall buildings

B
It has several metal stripes connected to a copper strip

C
One end of the conductor is buried deep under the ground

D
All of the above

Solution

A lightning conductor a device used to prevent tall buildings from being struck by lightning. It is fixed on the top of tall buildings with one end at the top having several sharp metal spikes that attract lightning. This is connected to a copper strip. The other end of the strip is attached to a large metal plate buried deep into the ground causing the electric charge to flow into the earth. This process is called earthing.
Question 5
1 / -0

When an object is rubbed by another, the objects get charged - one as positive and another as negative. In electrostatic series:

A
the one being positively charged comes first.

B
the one being negatively charged comes first.

C
both the objects come together.

D
objects appear as per their atomic numbers.

Solution

When two bodies are rubbed for charging, the one acquiring positive charge comes first on a higher position, in electrostatic series.

The series helps us to identify that if two objects are rubbed with each other, the one coming higher in the series will acquire positive charge and the other coming lower in the series will acquire negative charge.
Question 6
1 / -0

What causes lightning?

A
Excessive electric charge in the atmosphere

B
Increased chemical energy in the atmosphere

C
Attraction between two oppositely charged clouds

D
All of the above

Solution

When a charged cloud passes over an uncharged cloud, the uncharged cloud obtains an opposite charge. Later when two oppositely charged clouds come close to each other they attract and strongly combine to produce large amounts of heat, light and sound thus causing lightning.
Question 7
1 / -0

What is earthing?

A
Passage of large electric current resulting from a lightning into the earth

B
Burying electric charge into the earth

C
Preventing electric charge from entering the earth

D
None of the above

Solution

The process of transferring the immediate discharge of the electrical energy directly to the earth with the help of the low resistance wire is known as the electrical earthing.
Question 8
1 / -0

The fact that lightning and spark are essentially the same phenomena, was discovered in:

A
1882

B
1752

C
1770

D
1802

Solution

In 1752 Benjamin Franklin, an American scientist, showed that lightning and the spark from your clothes are essentially the same phenomena.
Question 9
1 / -0

When we can observe sparks on an electric post?

A
When there is huge rain

B
When there is thunderstorm

C
When wind blows and shakes the wire

D
All of the above

Solution

During huge rain, thunderstorm and strong wind, sparks are observed on an electric post. We have seen sparks when wires of the pole become loose. The spark is very common when a blowing of wind shakes the wire. We also observe sparks when a plug is loose in its socket. The spark is also seen due to heavy rain and thunderstorm.
Question 10
1 / -0

When a person combs his hair static electricity is sometimes generated by:

A
friction between comb and hair resulting in flow of electrons.

B
induction between comb and hair.

C
conducting property of hair.

D
contact between comb and hair resulting in a charge.

Solution

When a person combs his hair and moves the comb near to small pieces of paper then pieces of paper get attracted towards the comb. Because, during the combing, electrons get transfer from hair to comb so comb develops negative static charge.
Here, the Process of charge transfer is happing due to rubbing so you can say that 'friction between comb and hair resulting in flow of electrons'.
Hence Option A

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Some Natural Phenomena Test - 20

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Question 1

Yes

No, it can only be made of metals.

No, it can be made with any type of bodies with neutral charge

None of these

Solution

Question 2

Current electricity

Lightning

Conduction

Induction

Solution

Question 3

of the attraction force between the hairs and the cloth.

of the charge acquired to the forearm due to rubbing.

of the magnetic field created due to rubbing.

none of the above.

Solution

Question 4

It is usually fixed at the top of tall buildings

It has several metal stripes connected to a copper strip

One end of the conductor is buried deep under the ground

All of the above

Solution

Question 5

the one being positively charged comes first.

the one being negatively charged comes first.

both the objects come together.

objects appear as per their atomic numbers.

Solution

Question 6

Excessive electric charge in the atmosphere

Increased chemical energy in the atmosphere

Attraction between two oppositely charged clouds

All of the above

Solution

Question 7

Passage of large electric current resulting from a lightning into the earth

Burying electric charge into the earth

Preventing electric charge from entering the earth

None of the above

Solution

Question 8

1882

1752

1770

1802

Solution

Question 9

When there is huge rain

When there is thunderstorm

When wind blows and shakes the wire

All of the above

Solution

Question 10

friction between comb and hair resulting in flow of electrons.

induction between comb and hair.

conducting property of hair.

contact between comb and hair resulting in a charge.

Solution

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