Measurement and Data Processing
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Uncertainties and errors in measurement
SubtopicUncertainties and errors in measurement under Measurement and Data Processing for Grade 12 IB.
Preview questions (no answers)
- 1.
Which statement correctly describes the difference between accuracy and precision?
A.Accuracy is the closeness of repeated measurements to each other.
B.Precision is how close a measured value is to the true or literature value.
C.Accuracy refers to how close a measured value is to the literature value.
D.Precision is increased by eliminating systematic errors.
- 2.
Based on the classification of measurement errors shown in the diagram, which type of error is primarily reduced by taking the average of multiple repeated trials?
A.Systematic Error
B.Random Error
C.Percentage Error
D.Human Error
- 3.
A student measures the mass of a sample using a digital balance that displays g. What is the absolute uncertainty of this measurement?
A.g
B.g
C.g
D.g
Download the worksheet for Measurement and Data Processing - Uncertainties and errors in measurement to practice offline. It includes additional chapter-level practice questions.
Graphical techniques
SubtopicGraphical techniques under Measurement and Data Processing for Grade 12 IB.
Preview questions (no answers)
- 1.
Which term describes the process of estimating a value outside the range of measured data points by extending the line of best fit?
A.Integration
B.Interpolation
C.Linear regression
D.Extrapolation
- 2.
What is the primary purpose of a 'line of best fit' in a scatter plot of experimental data?
A.To connect every single data point exactly
B.To ignore all outliers in the data set
C.To show the general trend and minimize the effects of random errors
D.To ensure the gradient is always a positive value
- 3.
A student plots a graph of the volume of a gas () against its absolute temperature () at constant pressure. If the graph is a straight line passing through the origin, which statement best describes the relationship?
A.is directly proportional to
B.is inversely proportional to
C.is equal to
D.There is no correlation between and
Download the worksheet for Measurement and Data Processing - Graphical techniques to practice offline. It includes additional chapter-level practice questions.
Spectroscopic identification of organic compounds
SubtopicSpectroscopic identification of organic compounds under Measurement and Data Processing for Grade 12 IB.
Preview questions (no answers)
- 1.
Why is Tetramethylsilane (TMS) commonly used as an internal standard in H NMR spectroscopy?
A.It is highly reactive and bonds with the sample.
B.It provides multiple signals across the spectrum.
C.It absorbs energy in the IR region to calibrate the machine.
D.It gives a single, intense signal at a chemical shift of .
- 2.
A student identifies a broad absorption band in an infrared (IR) spectrum between and . Which functional group is most likely responsible for this signal?
A.Carbonyl ()
B.Carbon-carbon double bond ()
C.Alcohol ()
D.Carbon-hydrogen bond ()
- 3.
In a mass spectrum, which peak represents the intact molecule that has lost one electron?
A.The base peak
B.The molecular ion peak ()
C.The fragment peak
D.The isotope peak ()
Download the worksheet for Measurement and Data Processing - Spectroscopic identification of organic compounds to practice offline. It includes additional chapter-level practice questions.