FBISE, NCP & NBF-aligned resources for Classes 9–12
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Physics Chapter 1 : Topic 4
Accuracy and Precision
1 / 40
Accuracy of a measurement refers to:
Reasoning: Accuracy describes how close a measured value is to the actual value.
2 / 40
Precision of a measurement refers to:
Reasoning: Precision indicates how closely repeated measurements agree with each other.
3 / 40
A student measures the length of an object five times and obtains: $\mathbf{10.2\ cm}$, $\mathbf{10.2\ cm}$, $\mathbf{10.3\ cm}$, $\mathbf{10.2\ cm}$, $\mathbf{10.2\ cm}$. These measurements are:
Reasoning: Values are close to each other (precise), but accuracy depends on the true value.
4 / 40
A measuring instrument with a smaller least count generally provides:
Reasoning: Smaller least count allows finer measurements.
5 / 40
The least count of an instrument represents:
Reasoning: Least count is the smallest division measurable by an instrument.
6 / 40
Which instrument is more suitable for measuring the diameter of a thin wire?
Reasoning: Vernier calipers provide greater precision for small dimensions.
7 / 40
A ruler has a least count of $\mathbf{1\ mm}$. The uncertainty in measurement is approximately:
Reasoning: Instrumental uncertainty is usually taken as half the least count.
8 / 40
Random errors can be reduced by:
Reasoning: Averaging reduces random variations.
9 / 40
Systematic errors are errors that:
Reasoning: Systematic errors shift measurements in one direction.
10 / 40
A balance always shows $\mathbf{2\ g}$ more than the actual mass. This is an example of:
Reasoning: The error is constant in every measurement.
11 / 40
Which error occurs when a scale is viewed from an incorrect angle?
Reasoning: Parallax error occurs due to incorrect eye position.
12 / 40
If a stopwatch consistently records $\mathbf{0.2\ s}$ less than the actual time, it has:
Reasoning: A consistent error indicates a systematic problem.
13 / 40
A set of measurements $\mathbf{5.1\ cm}$, $\mathbf{5.1\ cm}$, $\mathbf{5.1\ cm}$, $\mathbf{5.1\ cm}$ shows:
Reasoning: Repeated identical values show high precision.
14 / 40
Which statement is correct?
Reasoning: Repeated values may agree but still differ from the true value.
15 / 40
The main purpose of calibration of an instrument is to:
Reasoning: Calibration checks and corrects systematic errors.
16 / 40
Which instrument generally has the highest precision?
Reasoning: Micrometer screw gauge has a very small least count.
17 / 40
A measurement of $\mathbf{25.0\ cm}$ indicates:
Reasoning: The final significant digit represents estimated uncertainty.
18 / 40
Significant figures in a measurement indicate:
Reasoning: Significant figures show the reliability and precision of data.
19 / 40
Which measurement is the most precise?
Reasoning: More significant figures indicate greater precision.
20 / 40
Increasing the number of repeated measurements mainly improves:
Reasoning: Repeated measurements reduce random uncertainty.
21 / 40
The average of several readings is calculated to:
Reasoning: Mean value gives a better estimate when random errors exist.
22 / 40
Which of the following causes random error?
Reasoning: Environmental fluctuations produce unpredictable variations.
23 / 40
An instrument with high accuracy but low precision produces:
Reasoning: Accuracy relates to true value, while precision relates to consistency.
24 / 40
A micrometer screw gauge has least count $\mathbf{0.01\ mm}$. Compared with a ruler of least count $\mathbf{1\ mm}$, it is:
Reasoning: Smaller least count means higher precision.
25 / 40
Which situation represents high precision but low accuracy?
Reasoning: Grouping shows precision, while distance from center indicates poor accuracy.
26 / 40
The reliability of experimental data increases when:
Reasoning: Repetition allows error estimation and averaging.
27 / 40
Zero error occurs when:
Reasoning: Zero error is a calibration error caused by incorrect zero position.
28 / 40
Which error cannot usually be eliminated by taking averages?
Reasoning: Systematic errors require calibration or correction.
29 / 40
A thermometer reads $\mathbf{2}^{\mathbf{o}}\mathbf{C}$ higher than actual temperature at all times. The thermometer has:
Reasoning: Constant offset indicates systematic error.
30 / 40
A student records: $\mathbf{12.4\ cm}$, $\mathbf{12.5\ cm}$, $\mathbf{12.4\ cm}$, $\mathbf{12.6\ cm}$. The spread in values indicates:
Reasoning: Small variations between readings are due to random errors.
31 / 40
The quality of experimental data depends mainly on:
Reasoning: Good data requires both closeness to true value and consistency.
32 / 40
Which method improves accuracy?
Reasoning: Calibration reduces systematic deviation.
33 / 40
If all readings are very close but the average is far from the accepted value, the experiment is:
Reasoning: Consistency is high but correctness is poor.
34 / 40
The uncertainty of a measurement depends on:
Reasoning: Instrument resolution determines measurement uncertainty.
35 / 40
Which statement best describes a good measuring instrument?
Reasoning: Good instruments have high resolution and accuracy.
36 / 40
If a measurement is written as $\mathbf{50.0\ \pm \ 0.1\ cm}$, the value $\mathbf{0.1\ cm}$ represents:
Reasoning: The $\mathbf{\pm}$ value represents estimated uncertainty.
37 / 40
Which combination gives the best experimental result?
Reasoning: Precision combined with accuracy gives reliable data.
38 / 40
When comparing two measuring instruments, the better instrument usually has:
Reasoning: Smaller least count allows more precise measurements.
39 / 40
The purpose of estimating uncertainty is to:
Reasoning: Uncertainty communicates confidence in measurements.
40 / 40
A scientist repeats an experiment many times before reporting results because:
Reasoning: Repetition helps identify variation and improve reliability.
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