Total uncertainty, in the result obtained from the subtraction of two measurements, is equal to_______________?
Correct answer: A. Sum of their absolute uncertainties
- A. Sum of their absolute uncertainties
- B. The difference of their absolute uncertainties
- C. The product of their absolute uncertainties
- D. Division of their absolute uncertainties
Explanation
For subtraction, the maximum absolute uncertainty is found by adding the absolute uncertainties: if z = x - y, then Δz = Δx + Δy. This is because uncertainty in either reading can increase the uncertainty in the difference. Students may choose B by subtracting the measured values and incorrectly subtracting their uncertainties as well.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Force and Motion
1,416 free Force and Motion MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Displacement and Velocity questions
Which one is the highest power multiple ?
One pico stands for_________________?
The unit of force is _________ and its symbol is ______________ Which is the correct pair ?
An ideal standard of measurement of a base quantity has characteristics_______________?
Three students measured the length of a needle with meter rod and recorded as : (i) 0.2145m (ii) 0.21m (iii) 0.214m Which one is a correct record ?
Smaller the least count of the instrument more is the measurement________________?