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Q.

Given that the true value for a result is 2.00 g. Three students A, B and C take two measurements and report the result, data to illustrate precision and accuracy is given below.

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Which of the following students got the values which are both precise and accurate?

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a

Student A

b

Student B

c

Student C

d

None of the above

answer is C.

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Detailed Solution

Let the true value for a result is 2.00 g and student ‘A’  takes two measurements and report the result as 1.95 g and 1.93 g. The values are precise as they are close to each other but are not accurate.
An other student repeats the experiment and obtains 1.94 g and 2.05 g as the results for two measurements. These observations are neither precise nor accurate. When a third student repeats these measurements and reports 2.01 g and 1.99 g as the result. These values are both precise and accurate.

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