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Class 9 Physics Chapter 6: Mechanical Properties of Matter MCQs With Explanations
Practice Class 9 Physics Chapter 6: Mechanical Properties of Matter MCQs with explanations for Pakistani board exams. Includes solved objective questions, answer checking, chapter revision guidance and next chapter suggestions.
Chapter 6: Mechanical Properties of Matter Objective Preparation
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50Total MCQs
42With explanations
8Topics represented
Topics found: Pressure and Area Relationship, Mechanical Clock, Force-Extension Relationship, Pressure at Depth, Floating and Density, Fluid Pressure Transmission, Galvanometer Working, Barometer Liquid
Mechanical Properties of Matter MCQs With Explanations
Q1. If the area of a surface is doubled while keeping the force constant, the pressure:
Pressure is inversely proportional to area when force is constant; doubling area halves the pressure.
Q2. The balance wheel in a mechanical clock uses:
The balance wheel oscillates with the help of a hairspring, which provides the restoring torque essential for timekeeping in mechanical clocks.
Q3. A force-extension graph is a straight line through the origin for:
Hooke’s Law applies only within the elastic limit, where force is directly proportional to extension.
Q4. The pressure at a depth of 10 m in water (density 1000 kg/m³) is approximately:
Using P = ρgh = 1000 × 9.8 × 10 ≈ 98,000 Pa, which is approximately 100,000 Pa.
Q5. A substance with density 800 kg/m³ will in water:
Since the substance’s density is less than water’s, it will float according to Archimedes’ principle.
Q6. When a force is applied to a confined fluid, the pressure is transmitted equally in all directions. This is:
No explanation is available in the database for this MCQ yet.
Q7. The working of a galvanometer is based on:
A galvanometer detects electric current through the deflection of a coil in a magnetic field, which is due to the magnetic effect of current.
Q8. A barometer uses which liquid?
Mercury is used in traditional barometers due to its high density, allowing for a compact column height to measure atmospheric pressure.
Q9. Pressure in a liquid does NOT depend on:
No explanation is available in the database for this MCQ yet.
Q10. Which substance has the highest density?
Iron has a density of about 7.87 g/cm³, far higher than wood, water, or air.
Q11. A spring extends by 2 cm when a 4 N force is applied. Its spring constant is:
Spring constant k = F/x = 4 N / 0.02 m = 200 N/m, consistent with Hooke’s law.
Q12. The point on a force-extension graph where the graph is no longer straight is called:
The limit of proportionality is the point beyond which the extension is no longer directly proportional to the force applied, meaning the graph ceases to be a straight line.
Q13. A sharp knife cuts better than a blunt one because:
A sharp knife has a smaller contact area, increasing pressure for the same applied force, enabling easier cutting.
Q14. Weather forecasting relies heavily on monitoring changes in:
Changes in atmospheric pressure are critical indicators of approaching weather systems, such as high and low-pressure fronts, which drive forecast models.
Q15. As we go higher in the atmosphere, the atmospheric pressure:
Atmospheric pressure decreases with altitude due to the reduced weight of the air column above.
Q16. The density of mercury is 13600 kg/m³. This means:
Density is mass per unit volume; 13600 kg/m³ means 1 cubic meter has a mass of 13600 kg.
Q17. A hydraulic press has pistons of areas A₁ and A₂, where A₂ > A₁. If a force F₁ is applied to the smaller piston, what is the force exerted by the larger piston?
According to Pascal’s law, pressure is transmitted equally, so F₁/A₁ = F₂/A₂. Rearranging gives F₂ = F₁ × (A₂/A₁).
Q18. The pressure in a fluid acts:
Fluid pressure is transmitted equally in all directions due to the random motion of fluid particles and Pascal's principle.
Q19. A material that does not return to its original shape after deformation is called:
Plastic deformation is defined as permanent deformation where a material does not return to its original shape after the applied stress is removed.
Q20. The force required to produce unit extension in a spring is called:
The spring constant (k) is defined as the force needed to extend or compress a spring by one unit of length, per Hooke's law.
Q21. When a spring is stretched beyond its elastic limit, it:
Beyond the elastic limit, materials undergo plastic deformation, meaning they do not return to their original shape even after the force is removed.
Q22. Which of these devices uses Hooke's law?
No explanation is available in the database for this MCQ yet.
Q23. The pressure at the bottom of a lake depends on:
Hydrostatic pressure increases with depth due to the weight of the water column above, making depth the primary factor.
Q24. A manometer is primarily used to measure:
A manometer measures the pressure of gases by comparing it to atmospheric pressure using a column of liquid, making it ideal for gas pressure differences.
Q25. The density of a substance can be calculated using:
Density is defined as the mass per unit volume of a substance, represented by the formula ρ = m/V.
Q26. In a hydraulic press, a small force can lift a heavy load because:
Pascal's principle states that pressure applied to an enclosed fluid is transmitted undiminished to all parts of the fluid, allowing a small force on a small area to generate a larger force on a larger area.
Q27. The pressure exerted by the atmosphere at sea level is about:
Standard atmospheric pressure at sea level is 101,325 Pa, commonly rounded to 101,300 Pa in educational contexts.
Q28. The spring balance works on the principle of:
Hooke's law states that the force exerted by a spring is proportional to its extension, which is the fundamental principle behind spring balance operation.
Q29. An object that floats in water has density:
An object floats when its average density is less than that of the fluid it is immersed in.
Q30. The density of water is:
Water has a density of approximately 1000 kg/m³ at 4°C, the standard reference value.
Q31. A force of 100 N acts on an area of 2 m². The pressure is:
No explanation is available in the database for this MCQ yet.
Q32. The pressure at a depth h in a liquid of density ρ is given by:
Hydrostatic pressure depends on fluid density, gravity, and depth, given by the formula P = ρgh.
Q33. Which material has the highest modulus of elasticity?
Steel has a much higher Young's modulus than rubber, meaning it is stiffer and more resistant to elastic deformation under stress.
Q34. The gradient of a force-extension graph represents:
No explanation is available in the database for this MCQ yet.
Q35. The limit beyond which a material does not return to its original shape is called:
The elastic limit is the maximum stress a material can withstand and still return to its original shape upon removal of the load.
Q36. The device used to measure atmospheric pressure is called:
A barometer measures atmospheric pressure using a column of mercury or an aneroid mechanism.
Q37. Hydraulic brakes work on the principle of:
Hydraulic systems operate on Pascal's law, which states that pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the container.
Q38. Pascal's law states that pressure in a fluid is:
Pascal's law asserts that a change in pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the container.
Q39. The pressure at a point in a fluid depends on:
No explanation is available in the database for this MCQ yet.
Q40. Atmospheric pressure is measured using:
A barometer is specifically designed to measure atmospheric pressure using columns of mercury or other fluids.
Q41. Pressure in a liquid:
Liquid pressure is directly proportional to depth because of the weight of the fluid column above a given point.
Q42. One pascal is equal to:
Pascal is the SI unit of pressure, defined as one newton of force per square meter (N/m²).
Q43. The SI unit of pressure is:
No explanation is available in the database for this MCQ yet.
Q44. Pressure is defined as:
Pressure is defined as the amount of force applied perpendicularly to a given surface area.
Q45. The SI unit of density is:
Density is mass per unit volume; the SI unit for mass is kilogram and for volume is cubic meter, so kg/m³ is the correct SI unit.
Q46. Density is defined as:
No explanation is available in the database for this MCQ yet.
Q47. The SI unit of spring constant is:
Spring constant is force per unit extension, so its SI unit is newtons per meter (N/m).
Q48. The spring constant k is given by:
Hooke’s Law states that the spring constant k equals the force applied divided by the extension produced: k = F/x.
Q49. Hooke's law states that within elastic limit:
Hooke's law defines the linear relationship between stress and strain in elastic materials up to the proportional limit.
Q50. The property of a material to regain its original shape after deformation is called:
Elasticity is the ability of a material to return to its original shape after the deforming force is removed, as described by Hooke's law within the elastic limit.
After Chapter 6: Mechanical Properties of Matter, 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 6: Mechanical Properties of Matter 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: Mechanical Properties of Matter
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.
Mechanical Properties of Matter: 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 Mechanical Properties of Matter after the quiz
List the questions you missed from Mechanical Properties of Matter 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
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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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