Some Natural Phenomena Test

Result

Some Natural Phenomena Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

Why shouldn't one stand under a tree or a tall building during a thunderstorm?

A
Lightning can strike trees and buildings,

B
Trees and buildings may fall causing damage,

C
Trees and buildings do not offer enough escape ground,

D
None of the above,

Solution

Sometimes electric discharge can take place between the charged cloud and Earth. While passing over a tree or a tall building an opposite charge may be induced causing a lightning to strike the tree or a building and if the charge is large it may cause severe damage and may prove to be fatal. Thus, it is advised to stay away from tall buildings or tree during thunderstorms.
Question 2
1 / -0

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

A
Dissipating the electric charge away from the building

B
Conducting the lightning safely to the ground

C
Absorbing the electric charge

D
None of these

Solution

Lightning Conductor is a device used to protect buildings from the effect of lightning. A metallic rod, taller than the building, is installed in the walls of the building during its construction. One end of the rod is kept out in the air and the other is buried deep in the ground. The rod provides an easy route for the transfer of electric charge to the ground.
The lightning conductor protects the building by conducting the lightning safely to the ground.
Question 3
1 / -0

When a glass rod is rubbed with a piece of silk cloth the rod:

A
and the cloth both acquire positive charge.

B
becomes positively charged while the cloth has a negative charge.

C
and the cloth both acquire negative charge.

D
becomes negatively charged while the cloth has a positive charge.

Solution

The two objects charged by friction gets oppositely charged.
Charge acquired by the glass rod is positive and charge acquired by the cloth is negative.
Question 4
1 / -0

What is meant by earthing?

A
To capture high electric sparks and moving them to ground to minimise its effect

B
To capture high electric sparks and moving them to ground to maximise its effect

C
To capture high electric sparks and moving them to cloud to minimise its effect

D
none

Solution

Earthing is the process of transferring the immediate discharge of electricity directly to the earth plate, by means of low resistance electrical cables or wires. In case of a short circuit due to leakages arising from weak insulation or damage, the earthing wire safely removes excess electricity and passes it on to the ground. Safety to persons operating high power electrical systems is ensured by earthing.
Question 5
1 / -0

Which factors from below affects the frequency,distribution,strength and physical properties of lightning?

A
Ground elevation

B
latitude

C
relative humidity

D
All of the above

Solution

Factors affecting the distribution, strength, frequency and physical properties of a lightning are as follows:
1. Latitude.
2. Existing wind currents.
3. Elevation of the ground.
4. Relative humidity.
4. Proximity of water bodies, both cold as well as warm.
Question 6
1 / -0

What is the main function of lightning conductor?

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

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

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

D
None

Solution

A lightning conductor is a conducting rod that acts as a path for the charges to go to the ground or the earth. The open end of the rod collects the charges when the lightning strikes and then passes it to the ground through it as the other end of the rod is buried deep within the ground.

Option A is correct.
Question 7
1 / -0

When a glass rod is rubbed with a piece of silk cloth the rod ?

A
And the cloth both acquire positive charge.

B
Becomes positively charged while the cloth has a negative charge.

C
And the cloth both acquire negative charge.

D
Becomes negatively charged while the cloth has a positive charge.

Solution

It is a convention to call the charge acquired by a glass rod when it is rubbed with silk as positive. The other kind of charge is said to be negative
Question 8
1 / -0

Fill in the blank.
_______is most commonly caused by charge separation in cumulonimbus clouds, or thunderheads.

A
Strom

B
Lightning

C
Cyclone

D
Hurrican

Solution

Lightening is an extremely high voltage, high current, transient electrical discharge. It is most commonly caused by charge separation in cumulonimbus clouds or thunderheads.
Question 9
1 / -0

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

A
a cathode

B
an anode

C
an electrode

D
a semiconductor

Solution

Conductor cables carry lightening current from lightening rod to the ground. Since electrode is an electrical conductor. These conductors are bonded to earth either through the metal structure of a pole or tower, or by additional ground electrodes installed at regular intervals along the line.
Question 10
1 / -0

What types of waves are seismic waves?

A
Non-mechanical waves

B
Elastic waves

C
Mechanical waves

D
Electromagnetic waves

Solution

Seismic waves are mechanical waves because they travel through the medium of the Earth.

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Some Natural Phenomena Test - 28

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Some Natural Phenomena Test - 28

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Question 1

Lightning can strike trees and buildings,

Trees and buildings may fall causing damage,

Trees and buildings do not offer enough escape ground,

None of the above,

Solution

Question 2

Dissipating the electric charge away from the building

Conducting the lightning safely to the ground

Absorbing the electric charge

None of these

Solution

Question 3

and the cloth both acquire positive charge.

becomes positively charged while the cloth has a negative charge.

and the cloth both acquire negative charge.

becomes negatively charged while the cloth has a positive charge.

Solution

Question 4

To capture high electric sparks and moving them to ground to minimise its effect

To capture high electric sparks and moving them to ground to maximise its effect

To capture high electric sparks and moving them to cloud to minimise its effect

none

Solution

Question 5

Ground elevation

latitude

relative humidity

All of the above

Solution

Question 6

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

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

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

None

Solution

Question 7

And the cloth both acquire positive charge.

Becomes positively charged while the cloth has a negative charge.

And the cloth both acquire negative charge.

Becomes negatively charged while the cloth has a positive charge.

Solution

Question 8

Strom

Lightning

Cyclone

Hurrican

Solution

Question 9

a cathode

an anode

an electrode

a semiconductor

Solution

Question 10

Non-mechanical waves

Elastic waves

Mechanical waves

Electromagnetic waves

Solution

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