An ideal standard of measurement of a base quantity has characteristics_______________?
Correct answer: D. Only a and b are correct
- A. Accessible
- B. Invariable
- C. Transportable
- D. Only a and b are correct
Explanation
An ideal standard should be accessible and invariable, so its value can be obtained conveniently and does not change with time or conditions. “Transportable” is not an essential characteristic of an ideal standard, so students may wrongly select an option including c because they confuse portability with reliability.
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About Displacement and Velocity
Displacement is the directed change in position, while velocity is the rate of change of displacement and includes both magnitude and direction. The topic connects position-time and velocity-time graphs with average and instantaneous values, and distinguishes displacement from distance and velocity from speed.
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