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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-6 section-3

Each section contains 100 MCQs on Electricity and Magnetism .
51
If electric resistance is to be decreased, then the number of resistances should be connected in . . . . . . . .
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Answer & Solution
Answer: Option B
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52
Good conductor of electricity is
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Answer: Option D
No explanation is given for this question. Let's Discuss on Board
53
How much work is done in moving a charge of 3 C across two points with a potential difference of 10 V?
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Answer & Solution
Answer: Option D
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54
The filament of a halogen lamp is an alloy of
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Answer: Option C
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55
After long periods of use, a grey spot develops on the inside of a bulb. This is because
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Answer & Solution
Answer: Option C
Solution:
Electric bulbs use a tungsten filament because tungsten has a very high melting point (around 3400°C) and can glow brightly without melting easily.

However, during long periods of use, the filament operates at extremely high temperatures, causing a small amount of tungsten to evaporate slowly from the surface of the filament.

These evaporated tungsten atoms travel inside the bulb and eventually condense on the inner surface of the glass, usually near the top where the temperature is relatively lower.

This deposition of tungsten forms a thin grey or black film, which reduces the bulb’s brightness over time.

The phenomenon is not due to dust, scorching, or a chemical change in the glass — it is purely a result of tungsten evaporation and condensation inside the bulb.

Therefore, the grey spot appears because the tungsten filament evaporates and collects on the inside surface of the bulb.

Hence, the correct answer is Option A: the tungsten filament evaporates and collects.
56
If the current and resistance are 10 A and 50 Ω respectively. Find the potential difference.
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Answer: Option D
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57
Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
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Answer: Option D
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58
Which of the following law describes the relation between the current flowing through a metallic wire and the Potential difference in its ends?
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Answer & Solution
Answer: Option A
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59
Assertion (A): In India, electricity distribution companies calculate the consumption of electricity in kWh.
Reason (R): Electrical system in India works at a frequency of 60 Hz.
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Answer: Option C
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60
The working principle of power transformer is based on . . . . . . . .
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Answer & Solution
Answer: Option D
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