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Light MCQ question and answer with solution | Physics Gk MCQs

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

Each section contains 100 MCQs on Light .
21
The ratio of the speed of light in a medium to a vacuum is called . . . . . . . . .
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Answer & Solution
Answer: Option B
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22
When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because the
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Answer & Solution
Answer: Option D
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23
Which one of the colours has the longest wavelength?
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Answer & Solution
Answer: Option D
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24
The speed of light with the rise in the temperature of the medium
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Answer & Solution
Answer: Option C
Solution:
The speed of light in a medium depends on the optical properties of that medium, specifically its refractive index.

The speed of light in a medium is given by the relation:

v = c / n

where v is the speed of light in the medium, c is the speed of light in vacuum (approximately 3 × 10⁸ m/s), and n is the refractive index of the medium.

The speed of light in a vacuum is a fundamental constant of nature and does not depend on temperature, pressure, or any other physical condition.

However, in a material medium such as air, glass, or water, slight variations in the refractive index with temperature may cause negligible changes in the speed of light. These changes are so small that, for all practical and theoretical purposes, the speed of light remains unaltered with temperature variations.

Therefore, with the rise in temperature of the medium, the speed of light effectively remains unaltered.

Hence, the correct answer is Option C: remains unaltered.
25
An air bubble in water will act like a
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Answer & Solution
Answer: Option D
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26
Consider the following statements.
1. The minimum size of a mirror required to see the full image of a person is half the height of the person.
2. A convex mirror always forms a virtual, erect and diminished image.
3. The laws of reflection are true for all reflecting surfaces.
4. The focal length of a plane mirror is zero.
Which of the statement(s) given above is/are correct?
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Answer & Solution
Answer: Option A
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27
In which of the following mirror size of image formed is always equal to the size of object?
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Answer & Solution
Answer: Option C
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28
Polaraids are used
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Answer & Solution
Answer: Option D
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29
Which of the following does not have an optical lens?
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Answer: Option D
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30
Which of the following is located on the polished surface of the mirror?
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Answer & Solution
Answer: Option C
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