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Unit and Measurement MCQ question and answer with solution | Physics Gk MCQs

Learn Unit and Measurement MCQ Questions and answers with easy and logical explanations in Physics Gk . Unit and Measurement MCQ question provides all type of technical mcq questions which is important for SSC-CGL, UPPSC, NDA, CDS and all govt examinations Page-4 section-3

Each section contains 100 MCQs on Unit and Measurement .
31
Which of the following pairs of physical quantities have the same dimensions?
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Answer & Solution
Answer: Option C
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32
Richter scale is used for measuring
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Answer & Solution
Answer: Option C
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33
A nanometre is equal to
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Answer & Solution
Answer: Option B
Solution:
"Nano" is a prefix that means one billionth (1/1,000,000,000).

A nanometer (nm) is therefore one billionth of a meter.

We know that 1 meter (m) = 100 centimeters (cm).

So,

1 nanometer (nm) = (1/1,000,000,000) meter = (1/1,000,000,000) × 100 cm

This simplifies to:

1 nm = 100 / 1,000,000,000 cm = 1 / 10,000,000 cm

In scientific notation:

1 / 10,000,000 = 10⁻⁷

Therefore, 1 nanometer = 10⁻⁷ cm.

✔ Correct Answer: Option B – 10⁻⁷ cm
34
Which one of the following is the unit of measure of the thickness of the ozone layer of the atmosphere?
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Answer & Solution
Answer: Option B
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35
Which of the following is not a unit of temperature?
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Answer & Solution
Answer: Option B
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36
What is measured in Cusec?
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Answer & Solution
Answer: Option C
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37
Which unit is used for measuring Astronomical distance?
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Answer & Solution
Answer: Option C
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38
Which one of the following instrument is used for locating submerged objects in an ocean?
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Answer & Solution
Answer: Option D
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39
Unit of momentum is-
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Answer & Solution
Answer: Option B
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40
Which of the following only gives magnitude and not direction?
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Answer & Solution
Answer: Option C
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