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Electricity and Magnetism MCQ question and answer with solution | Physics Gk MCQs

Learn Electricity and Magnetism MCQ Questions and answers with easy and logical explanations in Physics Gk . Electricity and Magnetism MCQ question provides all type of technical mcq questions which is important for SSC-CGL, UPPSC, NDA, CDS and all govt examinations Page-1 section-3

Each section contains 100 MCQs on Electricity and Magnetism .
1
If 4 resistances of $$\frac{1}{4}\Omega $$  are connected in series order then how much the maximum resistance may be obtained?
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Answer & Solution
Answer: Option C
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2
In an electrical circuit diagram the symbol of a cell consists of a long and a short vertical line. Its a long vertical line represent . . . . . . . . terminal.
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Answer: Option B
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3
If the potential difference between the ends of a conductor is doubled, what will be the effect on the current flowing in it?
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Answer & Solution
Answer: Option A
Solution:
This question relates to Ohm's Law, a fundamental principle in electricity.
Ohm's Law states: V = IR, where:
V is the potential difference (voltage).
I is the current.
R is the resistance.

The question says that the potential difference (V) is doubled. Let's say the initial potential difference was V1 and the initial current was I1. So, V1 = I1 * R.
Now the potential difference becomes V2 = 2 * V1.
Since the resistance (R) of the conductor remains constant, we can rewrite Ohm's Law for the new situation as:
2 * V1 = I2 * R, where I2 is the new current.

To find the relationship between I1 and I2, we can substitute V1 = I1 * R into the equation 2 * V1 = I2 * R:
2 * (I1 * R) = I2 * R

Divide both sides by R:
2 * I1 = I2

This means the new current (I2) is twice the original current (I1).

Therefore, the correct answer is: A: will be doubled
4
Which of the following metals is used as filament in lighting bulbs?
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Answer: Option D
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5
In step-down transformer, the AC output gives the
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Answer: Option A
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6
Step-up transformers are used for
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Answer: Option D
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7
If two Coulomb of charge flows the cross-section of a conductor is one second, what will be the current flowing there?
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Answer: Option C
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8
Insulators have resistivity of the order of
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Answer: Option D
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9
How much work is done in moving a charge of 5C across two points having a potential difference of 14V?
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Answer: Option C
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10
Which of the following effects is not caused by electricity?
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Answer: Option D
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