Class 9 Chemistry · Chapter 12 · Test 4
Accuracy and Precision
25 MCQs covering accuracy precision systematic errors random errors consistency of measurements causes of uncertainty and the importance of reliable and reproducible experimental results.
25 questions · 20 min · 25 marks
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Sample questions
The first 5 of 25. Try each one, then tap to see the answer.
Question 1
What does accuracy describe?
- ACloseness of a result to the true or known value
- BCloseness of repeated results to each other
- CThe size of the measuring instrument
- DThe number of measurements taken
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Answer: A
Accuracy measures how close results are to the true or known value.
Question 2
What does precision describe?
- ACloseness of two or more measurements to each other
- BCloseness of a measurement to the true value only
- CThe size of the sample
- DThe unit used for measurement
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Answer: A
Precision is the closeness of two or more measurements to each other.
Question 3
A student obtains 5.2 g three times while the true mass is 5.0 g. How are the results described?
- APrecise but not accurate
- BAccurate but not precise
- CBoth accurate and precise
- DNeither accurate nor precise
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Answer: A
The repeated 5.2 g readings are close to each other but not equal to the true value of 5.0 g.
Question 4
If repeated measurements are very close to one another but far from the true value they are:
- APrecise but not accurate
- BAccurate but not precise
- CBoth accurate and precise
- DNeither precise nor accurate
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Answer: A
Such measurements have high precision but low accuracy.
Question 5
If measurements are close to the true value but spread apart from one another they are:
- AAccurate but not precise
- BPrecise but not accurate
- CBoth precise and accurate
- DNeither accurate nor precise
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Answer: A
They are close to the true value so they are accurate but their lack of closeness to each other means they are not precise.
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