Physical Quantities and Measurements
7 medium multiple-choice questions linking concepts and applications from the chapter on physical quantities and measurements.
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Quiz Questions & Answers
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Question 1: Which statement best captures the role of physics as described in the lesson?
Physics focuses only on instruments and how to build devices, not on fundamental laws.
Physics studies only living organisms and their behavior, separate from other sciences.
Physics is primarily a catalog of unconnected facts about materials without mathematical relations.
Physics provides laws describing matter and energy and underpins technologies like medical imaging and rockets.
Question 2: Why is measurement essential in everyday decisions according to the chapter?
Because measurement removes the need for instruments or calibration.
Because measurement guarantees absolute certainty with no uncertainty.
Because using words alone always produces precise outcomes without numbers.
Because quantifying size, mass or time enables clear comparison, communication and decision-making.
Question 3: Which example from the lesson best distinguishes a physical quantity from a non-physical one?
Color and length are both always non-measurable subjective qualities.
Temperature is non-physical, while taste is a base physical quantity.
Density is subjective and cannot be checked with numbers.
Mass measured in kilograms versus a food’s perceived 'sweetness' as a subjective feeling.
Question 4: What are the two essential parts required to express any measurement correctly?
Only a numerical magnitude, because units are optional.
A numerical magnitude and a standard unit.
A chart and a diagram, since numbers are optional.
An instrument brand name and an approximate value.
Question 5: Which best illustrates the difference between base and derived quantities in the chapter?
Base quantities change with instruments while derived ones are constant properties.
Derived quantities are the only ones measured; base quantities are not used practically.
Length, mass and time as base quantities; speed and density as quantities derived using mathematical relations.
All quantities are base quantities and none are derived.
Question 6: In an experiment measuring a block’s volume, which practice from the lesson improves accuracy?
Use a properly calibrated metre scale, read the smallest divisions carefully, and report units with the magnitude.
Always use the largest possible unit to avoid decimal points, regardless of scale.
Estimate size by eye to save time and omit units for simplicity.
Record only the instrument brand and assume zero error is negligible.
Question 7: How does the chapter suggest choosing which branch of physics and instruments to use for a problem?
Choose instruments randomly; the branch of physics is not relevant to measurement.
Match the phenomenon to the relevant branch (e.g., optics for light) and select instruments that measure the related quantities.
Always use mechanics instruments because all phenomena reduce to motion.
Use quantum physics tools for everyday temperature measurements for greater precision.