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Class 9 Physics Chapter 1: Physical Quantities and Measurements MCQs With Explanations
Practice Class 9 Physics Chapter 1: Physical Quantities and Measurements MCQs with explanations for Pakistani board exams. Includes solved objective questions, answer checking, chapter revision guidance and next chapter suggestions.
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Chapter 1: Physical Quantities and Measurements
50 MCQs
Chapter 1: Physical Quantities and Measurements Objective Preparation
Use this page for direct chapter practice, answer checking and explanation review. It is available through the clean URL shown in the browser, so students can bookmark and share this exact chapter.
50Total MCQs
50With explanations
8Topics represented
Topics found: Measurement of Length, SI Prefixes, Scientific Notation, Prefixes, Angles and Units, Base Quantities, Screw Gauge, Precision and Accuracy
Physical Quantities and Measurements MCQs With Explanations
Q1. The thickness of a book page is approximately:
A single sheet of paper is about 0.1 mm thick, which equals 1.0 × 10^-4 m, consistent with standard measurements.
Q2. The number of seconds in a day expressed using an SI prefix is:
One day has 86,400 seconds, which is 86.4 × 10^3 s = 86.4 ks; however, 8.64 × 10^4 s = 86.4 ks, so 8.64 ks is incorrect. Correction: 86.4 ks is correct, but option B is written as 8.64 ks — so the correct option is C.
Q3. The product (4 × 10^3 kg)(6 × 10^6 m) is:
Multiplying 4 × 10^3 and 6 × 10^6 gives 24 × 10^9, which converts to 2.4 × 10^10 in proper scientific notation.
Q4. The quantity 5.123 × 10⁴ m + 3.28 × 10⁵ m equals:
Converting 5.123 × 10⁴ to 0.5123 × 10⁵ and adding to 3.28 × 10⁵ gives 3.7923 × 10⁵ m, matching option A.
Q5. The symbol for the prefix "micro" is:
The symbol 'µ' (mu) is the internationally recognized symbol for the metric prefix 'micro', representing 10⁻⁶.
Q6. The unit of plane angle in SI is:
The radian is the SI derived unit for plane angle, defined as the angle subtended at the center of a circle by an arc equal in length to the radius.
Q7. Which of the following is NOT a base quantity?
Area is a derived quantity (length × length), not a base quantity in the SI system.
Q8. The range of a micrometer screw gauge is typically up to:
A micrometer screw gauge typically has a range of up to 25 mm (2.5 cm), suitable for precise measurements of small objects.
Q9. The closeness of a measurement to the true value is known as:
Accuracy refers to how close a measured value is to the true or accepted value.
Q10. A zero between two significant digits is:
Zeros between non-zero digits are always significant because they contribute to the precision of the measured value.
Q11. The accurately known digits plus the first doubtful digit in a measurement are called:
Significant figures include all reliably known digits plus the first uncertain or doubtful digit in a measured value.
Q12. The type of error that arises from unpredictable fluctuations in experimental conditions is called:
Random error arises from unpredictable variations in experimental conditions, leading to scattered measurements around the true value.
Q13. The volume of an irregular solid that does not dissolve in water can be found using:
A displacement can measures volume by water displacement, ideal for irregular solids insoluble in water.
Q14. When reading the meniscus of water in a measuring cylinder, the eye should be level with the:
For water, the meniscus is concave, so the volume is read at the lowest point of the curve to ensure accurate measurement.
Q15. The least count of a common stopwatch is usually:
Common analog and digital stopwatches used in schools and labs typically have a least count of 0.1 second.
Q16. The weight of an object is measured using a:
A spring balance measures weight directly by the extension of a spring under gravitational force, making it suitable for weight measurement.
Q17. The mass of an object is measured using a:
A physical balance compares masses directly and is used for accurate mass measurement, unlike spring balances which measure weight.
Q18. The least count of a screw gauge with a pitch of 0.5 mm and 50 divisions on the circular scale is:
Least count = pitch / number of divisions = 0.5 mm / 50 = 0.01 mm.
Q19. The pitch of a screw gauge is the distance moved by the spindle:
Pitch is defined as the axial distance moved by the spindle during one full rotation of the thimble.
Q20. If the zero of the Vernier scale is to the right of the main scale zero when the jaws are closed, the zero error is:
A rightward shift of the Vernier zero indicates a negative zero error because the instrument reads a positive value when it should read zero.
Q21. The part of the Vernier caliper used to measure the depth of a hole is called the:
The tail or depth gauge is the slender rod extending from the Vernier caliper used to measure depths of holes or slots.
Q22. The main scale of a Vernier caliper is divided into:
The main scale of a Vernier caliper is typically marked in millimetres for precise linear measurements.
Q23. The value of 2000 µs in seconds is:
1 microsecond (µs) equals 10^-6 seconds, so 2000 µs = 2000 × 10^-6 = 0.002 s.
Q24. The quantity 50000 cm is equal to:
50,000 cm equals 500 m because 100 cm = 1 m, so 50,000 ÷ 100 = 500.
Q25. Which of the following is a systematic error?
Systematic errors arise from consistent flaws in instruments or procedures, such as incorrect calibration.
Q26. The thickness of a single sheet of paper is best measured with a:
A micrometer screw gauge provides the necessary precision (0.01 mm) to measure the thickness of a single sheet of paper.
Q27. The unit of pressure, pascal, is a derived unit equivalent to:
The pascal is defined as one newton of force per square meter, making N/m² the correct dimensional expression of pressure in SI units.
Q28. The volume of a solid can be found by using:
The displacement method using a measuring cylinder measures volume of irregular solids by the volume of fluid displaced.
Q29. Which base unit has a prefix in its name?
Kilogram is the only SI base unit with a prefix ('kilo-') in its name; all others are defined without prefixes.
Q30. The SI unit for the amount of substance is:
The mole is the SI base unit for amount of substance, defined as containing exactly 6.02214076 × 10^23 elementary entities.
Q31. Rounding off 2.512 × 10^3 m to 2 significant figures gives:
Rounding 2.512 × 10^3 to two significant figures retains '2.5' as the first two digits, with the third digit (1) being less than 5.
Q32. Which of the following represents precision?
Precision refers to the consistency of repeated measurements, regardless of their accuracy to the true value.
Q33. The number of significant figures in 3.50 × 10^4 m is:
The digits 3, 5, and 0 in 3.50 are all significant because trailing zeros after a decimal point are significant. The exponent in scientific notation does not affect significant figure count.
Q34. How many significant figures are in the measurement 0.0045 m?
Leading zeros are not significant; only the digits 4 and 5 are significant, giving two significant figures.
Q35. The uncertainty in a measurement is reflected by its:
Significant figures indicate the precision of a measurement, reflecting the reliability and uncertainty of the measured value.
Q36. The error that occurs due to the incorrect position of the eye while reading a scale is called:
Parallax error occurs when the observer's eye is not perpendicular to the scale, causing incorrect readings due to viewing angle.
Q37. The volume of a liquid is accurately measured using a:
A measuring cylinder provides accurate volume measurements for liquids due to its calibrated graduations and narrow shape, minimizing parallax error.
Q38. Which of the following is a non-physical quantity?
Fear is an emotion, not a measurable physical quantity, unlike time, temperature, and force which are quantifiable physical properties.
Q39. The least count of a micrometer screw gauge is usually:
A micrometer screw gauge typically has a least count of 0.01 mm due to its 0.5 mm pitch and 50 divisions on the circular scale.
Q40. The least count of a Vernier caliper is typically:
A standard Vernier caliper has a least count of 0.01 mm, achieved by dividing 0.9 mm on the main scale into 10 Vernier divisions.
Q41. The scientific notation for 0.000052 meters is:
0.000052 is 5.2 × 10^-5 in scientific notation, as the decimal is moved five places to the right to get a coefficient between 1 and 10.
Q42. The prefix "kilo" represents a factor of:
The prefix 'kilo' is defined in the International System of Units (SI) as a multiplier of 1000, which is 10 raised to the power of 3.
Q43. Which of the following is a derived unit?
Newton is the derived unit of force, defined as kg·m·s⁻², while metre, second, and kelvin are base SI units.
Q44. The symbol for the SI unit of electric current is:
The symbol for the SI unit of electric current is 'A' for ampere; 'C' is the symbol for coulomb, a derived unit of charge.
Q45. The number of base units in the International System of Units (SI) is:
The SI system defines exactly seven base units: second, metre, kilogram, ampere, kelvin, mole, and candela.
Q46. One femtometre is equal to:
Femto- is the SI prefix for 10^-15, so one femtometre equals 10^-15 metres.
Q47. Which instrument is most suitable for measuring the internal diameter of a test tube?
Vernier calipers have internal jaws specifically designed to measure internal diameters accurately, making them ideal for test tubes.
Q48. The least count of a standard metre rule is:
A standard metre rule is marked in millimetres, so the smallest division is 1 mm, which defines its least count.
Q49. The SI unit of mass is:
The kilogram is the base SI unit of mass, defined by the Planck constant, and is the standard used in scientific measurements globally.
Q50. Which of the following is a physical quantity?
Length is a physical quantity because it can be measured quantitatively using standard units like meters, unlike abstract concepts such as love, beauty, or wisdom.
After Chapter 1: Physical Quantities and Measurements, Practice Next Chapters
Once you finish these MCQs, continue with the next available chapters from Physics so your revision stays chapter-wise and complete.
Chapter 1: Physical Quantities and Measurements Revision Guide
Complete the MCQs first, then review every incorrect answer against the textbook heading where that concept appears. For biology and other science subjects, pay attention to terminology, diagrams, sequence of processes, examples and differences between similar structures or functions.
This chapter page keeps the exact class, subject, chapter, question count, answer checking, explanations and follow-up chapters together, so students can revise from one focused URL instead of searching through the full book again.
Class 9 Physics MCQ Preparation: Physical Quantities and Measurements
This page supports Matric Part 1 practice in Physics.
At this stage, the main purpose is building the definitions, symbols, rules and study habits needed for later matric work. The questions available here should be
used with the current textbook and the instructions issued by the learner's school or examination board.
What Physics MCQs can test
In Physics, objective questions commonly draw on definitions, physical quantities, SI units, laws, graphs, diagrams, formulas and the interpretation of numerical situations.
A useful answer is based on the exact wording and concept, not simply on recognising a familiar option.
For this subject, learners should write the known quantities and units before choosing a formula, and distinguish a law from the example used to demonstrate it.
Physical Quantities and Measurements: focused MCQ revision
This chapter should be reviewed through its main definitions, examples, diagrams, comparisons and links with earlier Physics concepts.
Write a one-sentence reason for each corrected answer and note the textbook heading where the concept is explained.
Common mistakes for Class 9 learners
In this subject, frequent errors include mixing scalar and vector quantities, overlooking units, reversing cause and effect, or choosing a familiar formula without checking its conditions.
Separate new terms that look similar and connect every formula, rule or definition with at least one textbook example. When the page marks an answer as incorrect, the next step should be to identify
the mistaken idea and verify it, rather than memorising the displayed answer letter.
A practical revision routine
Read a small textbook section, answer a focused set of MCQs and correct the underlying idea before starting the next section. Before attempting the MCQs, review definitions, symbols, unit conversions, graph shapes, diagram labels and the meaning of each term in a formula.
Complete a manageable set without notes, check the result, and divide errors into missing knowledge,
misunderstood concepts and careless reading. Revise the appropriate section before repeating the chapter.
How to review Physical Quantities and Measurements after the quiz
List the questions you missed from Physical Quantities and Measurements and write the textbook heading
connected with each one. Explain the correct idea in your own words, then return later and answer a
fresh set. This gives the chapter page a clear purpose: finding specific weaknesses in
Physics rather than only collecting a score.
Accuracy and responsible use
Explanations are provided where they exist in the question bank, but educational databases can contain
incomplete or mistaken material. Confirm disputed answers with an authoritative textbook or teacher.
Ahmad Learning Hub provides a practice resource and does not claim that a question will appear in an
examination or that every available item represents an official board question.
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