Lesson 5.3.1.4
5.3.1.4 Chemical measurements Quiz: AQA Combined Science, Unit 10
20 questions
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Lesson 5.3.1.4, Chemical measurements: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 10: Quantitative chemistry, written with Revision Ninja.
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The 20 questions
-
What is always present whenever any physical measurement is made?
- Perfect accuracy
- Zero error
- Uncertainty
- An anomaly
-
Which statistical value is used to estimate uncertainty from repeat measurements?
- The mode
- The median
- The total
- The range
-
Repeat readings are 4.2 g, 4.6 g and 4.4 g. What is the uncertainty about the mean?
- +/- 0.6 g
- +/- 0.1 g
- +/- 0.4 g
- +/- 0.2 g
-
Repeat readings are 12.0 cm, 12.6 cm and 12.3 cm. What is the uncertainty about the mean?
- +/- 0.3 cm
- +/- 0.9 cm
- +/- 0.6 cm
- +/- 0.1 cm
-
Which graph type best shows the distribution of a set of repeat results?
- Histogram
- Line graph
- Pie chart
- Scatter graph
-
Why are repeat measurements taken during an experiment?
- Increase temperature
- Estimate uncertainty
- Eliminate all errors
- Speed up testing
-
Four results are 22, 25, 23 and 24. What is the uncertainty about the mean?
- +/- 3.0
- +/- 2.0
- +/- 1.5
- +/- 0.5
-
Two readings of a mass are 0.52 g and 0.48 g. What is the uncertainty about their mean?
- +/- 0.02 g
- +/- 0.50 g
- +/- 0.01 g
- +/- 0.04 g
-
What does a narrower range of repeat results about the mean indicate?
- Larger uncertainty
- Lower accuracy
- Higher precision
- Systematic error
-
Results have a mean of 30.0 and lie between 28.0 and 32.0. What is the uncertainty about the mean?
- +/- 1.0 units
- +/- 4.0 units
- +/- 2.0 units
- zero units
-
What does the vertical axis represent on a histogram of repeat measurements?
- Total mass
- Frequency
- Time elapsed
- Temperature
-
Why is a mean calculated from repeat readings instead of using a single result?
- Eliminates all errors
- Makes measurements larger
- Increases systematic bias
- Reduces random variation
-
Five readings are 10, 12, 11, 13 and 9. What is the uncertainty about the mean?
- +/- 3
- +/- 4
- +/- 2
- +/- 1
-
Which set of results is more precise: Set A (+/- 0.1) or Set B (+/- 0.4)?
- Neither
- Set A
- Both equal
- Set B
-
Three readings of a mass are 3.40 g, 3.50 g and 3.45 g. What is the uncertainty about the mean?
- +/- 0.10 g
- +/- 0.15 g
- +/- 0.05 g
- +/- 0.01 g
-
What does a wide range of repeat measurements around the mean imply?
- Higher precision
- Zero error
- Perfect repeatability
- Larger uncertainty
-
A student takes four readings with a mean of 20 mL. The furthest reading is 23 mL. What uncertainty should be stated?
- +/- 6 mL
- +/- 23 mL
- +/- 1 mL
- +/- 3 mL
-
Five results are 2.1, 2.3, 2.2, 2.6 and 2.3. What is the uncertainty about the mean?
- +/- 0.2
- +/- 0.5
- +/- 0.3
- +/- 0.1
-
Which term describes results that are close together when repeated?
- Accurate
- Biased
- Precise
- Valid
-
What do tightly grouped experimental results that are far from the true value show?
- Both precise and accurate
- Precise not accurate
- Neither precise nor accurate
- Accurate not precise
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