Which of the following statements are true in regards to earthing?

It protects us from electrical shocks.

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It is the exchange of charge between two charged bodies.

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It is the principle behind the working of an electroscope.

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Lightning conductors involve in the process of earthing.

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Solution

The correct options are
A It protects us from electrical shocks.
D Lightning conductors involve in the process of earthing.
Earthing is referred to as the process of transfer of charge of a body to the earth. It protects us from electric shocks due to any electrical leakages. Lightning conductors transfer the heavy amount of charge produced in lightning into the earth, thereby protecting the building and its residents from electric shocks. So they involve in the process of earthing. An electroscope on the other hand, is an instrument that is used to test the presence of charge on any object.

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Similar questions

Q. Lightning conductors are used to protect building from lightning strikes. Which of the following statements is / are true about lightning conductors?
1. Lightning conductors create an electric field at its top so that lightning strikes it preferentially
2. Lightning conductors reduce the effect of the strike by uniformly distributing the charge (current) over the surface of the building
3. Lightning conductors take all charge (current) to deep down in the earth
4. Lightning conductors must be installed at a place taller than the building
Select the correct answer using the code given below:

Assertion (A) :

Lightning conductors provide a low resistant path for the electricity to flow into the ground from the sky without damaging the building.

Reason (R) :

Earthing is the process in which electric discharge happens from an uncharged body to a highly charged body.

Assertion(A): An electroscope can be used to find the nature of charge on a body.
Reason(R): It is based on the principle: electric charge can be transferred from a charged object to another body.

Fill in the following blanks with suitable words :

(a) Like charges ........ ; unlike charges ...........

(b) Rubbing glass with silk makes a .......... charge on the glass.

(d) The negatively charged particles which are transferred from one object to another during charging by friction is called .......

(e) The charging of an object by rubbing it with another object is called charging by ........

(f) In an electroscope, the aluminium leaves diverge because like charges .........

(g) ......... is provided in buildings to protect us from electric shocks due to any leakage of electric current.

(h) Lightning is nothing but an ......... spark.

(i) Each fragment of earth's crust is called a ........

Q. Assertion (A): An electroscope can be used to find the presence of charge on a body.
Reason (R): It is based on the principle: Like charges repel each other.

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Standard VIII Physics

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