Class 9 Chemistry · Chapter 12 · Test 2
Accuracy, Precision and Errors
24 MCQs covering measurement error systematic errors random errors accuracy precision causes of measurement errors and methods and concepts used to obtain reliable and reproducible experimental results.
24 questions · 20 min · 24 marks
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Sample questions
The first 5 of 24. Try each one, then tap to see the answer.
Question 1
What is an error in measurement?
- AThe difference between measured value and actual value
- BThe sum of all measurements
- CThe unit of a measurement
- DThe instrument used for measurement
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Answer: A
An error is defined as the difference between the measured value and the actual value.
Question 2
Which two factors can cause measurement errors according to the chapter?
- ALimitations of the instrument and skill of the student
- BTemperature and pressure only
- CMass and volume only
- DLength and time only
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Answer: A
Errors may occur due to limitations of the measuring instrument and the skill of the student.
Question 3
What is a systematic error?
- AAn error that causes a constant effect on measurements
- BAn error that occurs only once
- CA mathematical conversion error
- DA mistake in writing the result
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Answer: A
Systematic errors naturally occur in measuring tools and can give a constant adjustment to each measurement.
Question 4
Which property of measurement is mainly affected by systematic error?
- AAccuracy
- BPrecision only
- CUnit conversion
- DAmount of substance
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Answer: A
Systematic error affects the accuracy of measurement.
Question 5
Which instrument may have a systematic error because it delivers a slightly different volume from its graduation?
- APipette
- BStopwatch
- CThermometer only
- DBalance only
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Answer: A
The chapter gives pipette as an example of an instrument that may have systematic error.
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