Physical Quantities And Units
Easyphysics
Which pair correctly represents a derived physical quantity and its SI unit?
Select the correct option:
Solution
Incorrect! Answer:
Power−Js−1
- Power: Defined as the rate of doing work (P=W/t). Since work is measured in Joules (J) and time in seconds (s), the SI unit is J/s or J⋅s−1, also known as the Watt (W).
- Pressure: P=F/A. SI unit is N/m2 or Pascal (Pa), not N⋅m.
- Energy: SI unit is the Joule (J), which is N⋅m=(kg⋅m⋅s−2)⋅m=kg⋅m2⋅s−2.
- Momentum: p=mv. SI unit is kg⋅m⋅s−1.
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About This Question
- Subject
- physics
- Chapter
- physics and measurement
- Topic
- physical quantities and units
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Power−Js−1
- Power: Defined as the rate of doing work (P=W/t). Since work is measured in Joules (J) and time in seconds (s), the SI unit is J/s or J⋅s−1, also known as the Watt (W).
- Pressure: P=F/A. SI unit is N/m2 or Pascal (Pa), not N⋅m.
- Energy: SI unit is the Joule (J), which is N⋅m=(kg⋅m⋅s−2)⋅m=kg⋅m2⋅s−2.
- Momentum: p=mv. SI unit is kg⋅m⋅s−1.
This easy difficulty physics question is from the chapter physics and measurement, covering the topic of physical quantities and units. It appeared in the 2025 exam.
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