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Ch: 2 Measurements And Calculations Review Accuracy And Precision
Test Description: Accuracy and Precision Review Questions
Instructions: Answer all questions to get your test result.
1) A measurement that closely agrees with an accepted value is best described as
A
reproducible
B
significant
C
precise
D
accurate
2) A numerical result is said to have good precision if
A
it agrees closely with an accepted value
B
repeated measurements agree closely
C
it is a large whole number
D
it has a small number of significant figures
3) A chemist obtained the values 5.22 g, 5.23 g, and 5.22 g for the mass of a sample. Without knowing the true mass of the sample , it can be said that these values have
A
good accuracy
B
poor precision
C
good precision
D
poor accuracy
4) The measurement 0.035550 g rounded off to 3 significant figures would be
A
0.0356 g
B
0.0355 g
C
0.356 g
D
0.04 g
5) Which of these measurements has been expressed to 2 significant figures?
A
30. 00 m
B
0.0402 m
C
402.10 mm
D
0.0020 m
6) The number of significant figures in the measurement 2010. 00 is
A
6
B
3
C
4
D
2
7) Which measurement has only nonsignificant zeros?
A
0.0045 s
B
50. g
C
102 days
D
50.0 m/s
8) For numbers less than 0.1, such as 0.05, the zeros to the right of the decimal point but before the first nonzero digit
A
show the decimal place of the first significant digit
B
are significant
C
show that the zero on the left side of the decimal is not significant
D
show uncertainty
9) How many significant figures are in 0.00305 00
A
3
B
8
C
6
D
5
10) Round 504 567 895 light years to 3 significant figures.
A
505 000 000. light years
B
505 light years
C
505 000 000 light years
D
504 light years
*select an answer for all questions
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