Physical World & Units - Units & Dimensions
Q. The unit of force in the SI system is derived from which of the following? (2023)
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A.
Mass and length
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B.
Mass, length, and time
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C.
Length and time
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D.
Mass and time
Solution
The unit of force (Newton) is derived from mass, length, and time: kg·m/s².
Correct Answer: B — Mass, length, and time
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Q. The unit of work is defined as one joule. What is one joule equivalent to? (2023)
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A.
One newton meter
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B.
One kilogram meter per second
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C.
One watt second
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D.
One pascal meter
Solution
One joule is defined as one newton meter (N·m).
Correct Answer: A — One newton meter
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Q. What is the base unit of time in the SI system? (2019)
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A.
Minute
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B.
Hour
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C.
Second
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D.
Day
Solution
The base unit of time in the SI system is the second (s).
Correct Answer: C — Second
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Q. Which of the following is the correct unit for pressure? (2020)
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A.
Pascal
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B.
Joule
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C.
Newton
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D.
Watt
Solution
The SI unit for pressure is Pascal (Pa), which is equivalent to N/m².
Correct Answer: A — Pascal
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