A rectangular plate has length (2±0.02) cm and width (1±0.01) cm. The maximum percentage error in the measurement of its area is:
Correct answer: B. 2%
- A. 1%
- B. 2%
- C. 3%
- D. 5%
Explanation
The following is the solution: % uncertainty of length= 0.02/2 x 100= 1% % uncertainty of width=0.01/1 x 100= 1% % uncertainty of the area of rectangle=1+1 =2%
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Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
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