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What is the SI unit for mass?
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The SI unit for mass is the kilogram (kg).
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Define accuracy in measurements.
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Accuracy refers to how close a measured value is to the true value.
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What does precision in measurements refer to?
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Precision refers to how close repeated measurements are to each other.
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How is absolute uncertainty expressed?
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Absolute uncertainty is the margin of error of a measurement, expressed in the same units as the measurement.
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What is a systematic error?
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A systematic error is a consistent, repeatable error associated with faulty equipment or flawed experiment design.
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Name a common example of a random error.
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A common example of a random error is fluctuation in electrical readings due to changes in temperature.
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How do you calculate percentage uncertainty?
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Percentage uncertainty is calculated by dividing the absolute uncertainty by the measured value and multiplying by 100.
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What is meant by the term ‘resolution’ of a measuring instrument?
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Resolution is the smallest change in a quantity being measured that can be detected by an instrument.
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When combining uncertainties, which type should you add directly?
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Absolute uncertainties should be added directly when combining multiple measurements.
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What are base quantities in physics?
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Base quantities are the fundamental quantities of measurement, such as length, mass, time, electric current, temperature, amount of substance, and luminous intensity.
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Give an example of a derived quantity.
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Velocity, which is derived from the base quantities of length and time, is an example of a derived quantity.
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Why is calibration important for measurement devices?
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Calibration ensures that a measurement device provides accurate readings by comparing it with a standard.
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How can parallax errors be minimized?
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Parallax errors can be minimized by ensuring measurements are taken at eye level and perpendicular to the measuring scale.
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What is the purpose of significant figures in a measurement?
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Significant figures communicate the precision of a measurement by showing which digits are meaningful and reliable.
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How do you determine the number of significant figures to use in a result?
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The number of significant figures in a result should match the measurement with the smallest number of significant figures involved in the calculation.
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