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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-1

Each section contains 100 MCQs on Unit and Measurement .
31
What is measured in hertz?
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Answer & Solution
Answer: Option A
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32
A vector quantity has both magnitude and direction, whereas a scalar quantity has only magnitude and no direction. Which of the following is a vector quantity?
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Answer: Option C
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33
The SI unit of electrical resistance of conductor is
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Answer: Option D
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34
The apparatus used for detecting lie is known as
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Answer: Option A
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35
Which instrument is used for measuring density of milk?
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Answer: Option B
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36
One micron represents a length of
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Answer & Solution
Answer: Option B
Solution:
The correct answer is Option B: 10-4 cm.
Here's why:
Micron is another name for micrometer.
The prefix "micro-" always means one millionth (1/1,000,000) or 10-6.
So, 1 micron = 1 micrometer = 10-6 meters.
Now, we need to convert meters to centimeters.
We know that 1 meter = 100 centimeters or 102 centimeters.
Therefore, 1 micron = 10-6 meters = 10-6 * 102 centimeters = 10-6+2 centimeters = 10-4 centimeters.
So, one micron represents a length of 10-4 cm.
37
The international unit of Speed is-
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Answer: Option A
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38
How can the height of a person who is six feet tall, be expressed (approximately) in nanometre?
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Answer: Option C
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39
The physical unit is
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Answer: Option A
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40
Which among the following devices is used to measure the atmospheric pressure?
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Answer: Option D
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