Difference between Earth and Neutral MCQ

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Difference between Earth and Neutral is an important concept from Current Electricity chapter of CBSE Class 12 Physics Syllabus. The neutral wire behaves like a return conductor for the electric current flowing through the electric circuit. The neutral wire is responsible for completing the AC circuit by taking the current back to the transformer source. An earthing wire on the other hand acts as a safety connection to protect the electrical equipment from electric shock.

Color Coding for the Wires

The earthing and neutral wires differ based on their application, direction of current flow, ability to get converted into one another, and the connection where they are employed. Let us look at some important multiple-choice-based questions from this topic below.

Difference between Earth & Neutral MCQs

Ques. How is the neutral of a power system connected to the Earth?

Through a reactor
Through a resistor
Directly
All of the above

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Ans. The correct option is D. All of the above

Explanation: Neutral earthing is also called system earthing and is connected to the ground. This can be connceted directly, using a resistor or a reactor.

Ques. Grounding of substation helps in?

Providing safety to the working personnel
Ground connection for a neutral system
Discharge path for surge arrestors
All of the above

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Ans. The correct option is D. All of the above

Explanation: Some of the advantages of earthing are:

providing stable voltage conditions
preventing voltage peaks during disturbances
protection against lightning
discharge path for surge arrestors

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Ques. How is the size of an earth wire determined?

Ampere capacity of wires
Voltage of wire
Atmospheric conditions
None of the above

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Ans. The correct option is A. Ampere capacity of wires

Explanation: Earth wire prevents the live wire from overloading by absorbing electrons and flowing to the ground. Hence, the size of the earth wire is determined by the ampere capacity of the wires.

Ques. What is the minimum size of the earth wire?

1 mm² Cu & 1 mm² Al
1.5 mm² Cu & 1.5 mm² Al
1 mm² Cu & 1.5 mm² Al
1 mm² Cu & 0.5 mm² Al

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Ans. The correct option is C. 1 mm² Cu & 1.5 mm² Al

Explanation: The minimum size of the earth wire for light circuits is 1 mm² Copper & 1.5 mm² Aluminium.

Ques. Typical domestic wiring has an earth resistance of

About 1000 Ohms
About 100 Ohms
Very Large
Less than 5 Ohms

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Ans. The correct option is D. Less than 5 Ohms

Explanation: As per IE rules, for typical domestic wiring the earth resistance is less than 5 Ohms.

Ques. The earth wire is made of _______ material.

Iron
Galvanized steel
Copper
Aluminium

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Ans. The correct option is B. Galvanized steel

Explanation: Earthing prevents appliances from electric shock. It provides a path for the faulty current to directly flow to the ground. Owing to its mechanical properties, earth wires are made of galvanized steel.

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Ques. What color is recommended for Earth connection?

Green
Black
Blue
Red

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Ans. The correct option is A. Green

Explanation: The following table gives the color code for the different types of wires:

Ques. What is the use of a ground wire?

Provide tower support
Provide good regulation
Prevent overloading
To connect a circuit conductor or divide to an earth plate

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Ans. The correct option is D. To connect a circuit conductor or divide to an earth plate

Explanation:

Earth wire prevents live wire from overloading. This is connected to the ground because the earth is the reference point to an electrical circuit.

Ques. Earthing is important as it gives protection against__________.

Overloading
Danger from electric shock
Voltage fluctuation
The higher temperature of conductors

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Ans. The correct option is B. Danger from electric shock

Explanation: Earthing wire provides an alternative path for the faulty current to flow toward the ground. This helps in protecting people, appliances, and property from unwanted accidents caused due to shocks or electrical mishaps.

Ques. The pipe earthing resistance is regulated by?

Adding Copper rod
Adding salt and water
Replacing conductor
Replacing earthing rod

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Ans. The correct option is B. Adding salt and water

Explanation: The pipe earthing resistance is regulated by the addition of salt and water. Alternate layers of salt and coke increase the area of the earth and decrease its resistance.

Ques. Two separate earthing in panel board are provided because

The panel board is made in a metal box
To control the stray field in the panel
To reduce the voltage drop in the panel board
To ensure one earthing in case of other failures

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Ans. The correct option is D. To ensure one earthing in case of other failures

Explanation: In the case of failure of one circuit, the earth's current keeps on flowing through the other circuit and thus, the equipment remains fully protected against the earth's fault.

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Difference between Earth and Neutral MCQ

Difference between Earth & Neutral MCQs

CBSE CLASS XII Related Questions

2.
Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

3.
A tank is filled with a liquid to a height of \( 12.5 \, \text{m} \). The apparent depth of a needle lying at the bottom of the tank is measured to be \( 9.0 \, \text{m} \). Calculate the speed of light in the liquid.

4.
If both the number of protons and the neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction? Explain.

5.
Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.

6.
Two thin lenses of focal length \( f_1 \) and \( f_2 \) are placed in contact with each other coaxially. Prove that the focal length \( f \) of the combination is given by \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]

Similar Physics Concepts

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Difference between Earth and Neutral MCQ

Difference between Earth & Neutral MCQs

CBSE CLASS XII Related Questions

2.Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

3.A tank is filled with a liquid to a height of \( 12.5 \, \text{m} \). The apparent depth of a needle lying at the bottom of the tank is measured to be \( 9.0 \, \text{m} \). Calculate the speed of light in the liquid.

4. If both the number of protons and the neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction? Explain.

5.Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.

6.Two thin lenses of focal length \( f_1 \) and \( f_2 \) are placed in contact with each other coaxially. Prove that the focal length \( f \) of the combination is given by \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

2.
Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

3.
A tank is filled with a liquid to a height of \( 12.5 \, \text{m} \). The apparent depth of a needle lying at the bottom of the tank is measured to be \( 9.0 \, \text{m} \). Calculate the speed of light in the liquid.

4.
If both the number of protons and the neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction? Explain.

5.
Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.

6.
Two thin lenses of focal length \( f_1 \) and \( f_2 \) are placed in contact with each other coaxially. Prove that the focal length \( f \) of the combination is given by \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]