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Class 9 Physics Chapter 7: Thermal Properties of Matter MCQs With Explanations
Practice Class 9 Physics Chapter 7: Thermal Properties of Matter MCQs with explanations for Pakistani board exams. Includes solved objective questions, answer checking, chapter revision guidance and next chapter suggestions.
Chapter 7: Thermal Properties of Matter Objective Preparation
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50Total MCQs
45With explanations
8Topics represented
Topics found: Winter Thermal Sensation, Heat Transfer in Solids, Low Specific Heat Effects, Sublimation Process, Thermometer Metal, Thermal Expansion Applications, Temperature Conversion, Absolute Zero
Thermal Properties of Matter MCQs With Explanations
Q1. In winter, metals feel colder than wood because metals:
Metals conduct heat away from the skin more rapidly than wood, creating a sensation of coldness.
Q2. The main mode of heat transfer in solids is:
No explanation is available in the database for this MCQ yet.
Q3. A substance with low specific heat capacity:
Low specific heat means less energy is needed to raise the temperature, so the substance heats up quickly.
Q4. The process where solid changes directly to gas is called:
Sublimation is the phase transition from solid directly to gas without passing through the liquid state.
Q5. Which metal is used in thermometers?
Mercury is used in traditional thermometers due to its uniform thermal expansion and visibility.
Q6. The thermal expansion of solids is used in:
Thermal expansion is applied in riveting (heating rivets to expand them), railway track design (expansion joints), and other engineering contexts.
Q7. 0°C is equal to:
The Kelvin scale starts at absolute zero, and 0°C is defined as exactly 273.15 K, commonly rounded to 273 K in basic science contexts.
Q8. Absolute zero is:
Absolute zero is the lowest possible temperature, defined as 0 Kelvin, where molecular motion theoretically ceases.
Q9. The melting point of a substance is the same as its:
Melting point and freezing point occur at the same temperature, representing the equilibrium between solid and liquid phases.
Q10. Which factor does NOT affect the rate of evaporation?
Evaporation rate depends on temperature, surface area, and wind speed, but not on the total mass of the liquid present.
Q11. Evaporation causes:
Evaporation requires latent heat, which is drawn from the surrounding environment, resulting in a cooling effect.
Q12. During boiling, the temperature of a liquid:
During the phase change of boiling, all heat energy supplied is used to overcome intermolecular forces to convert the liquid to gas, rather than increasing the kinetic energy of the molecules.
Q13. The amount of heat required to change 1kg of liquid to gas at constant temperature is called:
Latent heat of vaporization is defined as the heat energy needed to convert a unit mass of a substance from liquid to vapor at its boiling point without changing temperature.
Q14. The phenomenon where different metals expand at different rates is used in:
A bimetallic strip exploits differential thermal expansion of two bonded metals to produce mechanical motion, making it the direct application of this phenomenon.
Q15. When we touch a metal object, it feels colder than a wooden object at the same temperature because metal:
Metal conducts heat away from the skin more rapidly than wood, creating a sensation of coldness even when both are at thermal equilibrium with the environment.
Q16. The silvered surfaces in a thermos flask reduce heat loss by:
Silvered surfaces are highly reflective, which minimizes the transfer of thermal energy via electromagnetic waves (radiation).
Q17. The vacuum in a thermos flask prevents heat loss by:
A vacuum eliminates molecular contact, preventing conduction and convection; radiation is reduced by reflective surfaces, not the vacuum itself.
Q18. Water is used in car radiators because it has:
Water has a high specific heat capacity, allowing it to absorb large amounts of heat with a relatively small temperature increase, making it an efficient coolant.
Q19. The range of a laboratory thermometer is typically:
Laboratory thermometers typically cover a broad range from -10°C to 110°C to accommodate various experiments.
Q20. Which thermometer commonly uses alcohol instead of mercury?
Maximum-minimum thermometers often use alcohol due to its low freezing point, making it suitable for recording temperature extremes in weather stations.
Q21. The process where gas changes directly to solid is called:
Deposition is the phase transition in which a gas transforms directly into a solid without passing through the liquid phase.
Q22. When a substance is heated, its particles:
Heating increases the kinetic energy of particles, causing them to move faster on average.
Q23. The SI unit of specific heat capacity is:
Specific heat capacity is defined as energy per unit mass per degree Celsius, so its SI unit is joules per kilogram per degree Celsius (J/kg°C).
Q24. The amount of heat energy contained by a body depends on its:
Heat energy depends on mass, temperature, and material-specific heat capacity. Among the given options, only 'both mass and temperature' is correct, as volume alone is insufficient.
Q25. Good insulators of heat are usually:
Thermal insulators are typically poor conductors of electricity because both properties depend on free electron movement, which is limited in insulators.
Q26. Land breeze and sea breeze are caused by:
Land and sea breezes result from differential heating of land and water, creating convection currents as air moves from high to low pressure areas.
Q27. The transfer of heat without any medium is called:
Radiation transfers heat via electromagnetic waves and does not require a medium, unlike conduction or convection.
Q28. The kink in a clinical thermometer:
The kink acts as a constriction to prevent mercury from returning to the bulb after measurement, allowing readings to be taken off the body.
Q29. The clinical thermometer measures temperature from:
Clinical thermometers are designed to measure human body temperature, which typically ranges between 35°C and 42°C.
Q30. When water freezes, its volume:
Water expands upon freezing due to the formation of a crystalline lattice structure, making ice less dense than liquid water and increasing its volume.
Q31. The latent heat of fusion of ice is:
The latent heat of fusion of ice is approximately 334 kJ/kg, commonly rounded to 336 kJ/kg in educational contexts.
Q32. The process where liquid changes to gas at all temperatures is called:
Evaporation occurs at the surface of a liquid at any temperature below boiling point, unlike boiling which requires a specific temperature.
Q33. Which substance has the highest specific heat capacity?
Water has the highest specific heat capacity among common substances, requiring more energy to raise its temperature by 1°C compared to iron, copper, or aluminum.
Q34. The expansion of metals when heated is used in:
Thermometers use the thermal expansion of liquids or metals to measure temperature changes.
Q35. The vacuum flask reduces heat loss by:
The vacuum flask minimizes conduction (via vacuum), convection (via vacuum and sealed design), and radiation (via reflective surfaces).
Q36. Which color is the best absorber of heat?
Black surfaces absorb most wavelengths of visible light and convert them to heat, making them the best absorbers.
Q37. Good conductors of heat are usually:
Metals like copper and aluminum, which are good heat conductors, also have free electrons that enable efficient electrical conduction.
Q38. The melting point of ice is:
Ice melts at 0°C under standard atmospheric pressure, which is the defined freezing/melting point of water on the Celsius scale.
Q39. The boiling point of water at standard atmospheric pressure is:
Water boils at 100°C at standard atmospheric pressure (1 atm).
Q40. The heat required to change a solid into liquid at constant temperature is called:
Latent heat of fusion is the energy absorbed by a solid to change into a liquid at its melting point without changing temperature.
Q41. The specific heat capacity of water is:
No explanation is available in the database for this MCQ yet.
Q42. The amount of heat required to raise the temperature of 1kg of a substance by 1°C is called:
No explanation is available in the database for this MCQ yet.
Q43. Heat from the Sun reaches Earth by:
Heat from the Sun reaches Earth through electromagnetic radiation across the vacuum of space.
Q44. The process of heat transfer through fluids is called:
Convection is the transfer of heat through fluids (liquids and gases) via the movement of the fluid itself.
Q45. Which material is the best conductor of heat?
Copper has high thermal conductivity due to its free electrons that efficiently transfer kinetic energy through the material.
Q46. The process by which heat travels in solids is called:
Conduction is the transfer of heat through direct molecular collisions within a solid, making it the primary mode of heat transfer in solids.
Q47. The normal human body temperature is about:
No explanation is available in the database for this MCQ yet.
Q48. Temperature is measured in:
No explanation is available in the database for this MCQ yet.
Q49. The SI unit of heat is:
The joule is the SI unit for all forms of energy, including heat.
Q50. Heat is a form of:
Heat is the transfer of thermal energy; it is fundamentally a form of energy.
After Chapter 7: Thermal 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 7: Thermal 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: Thermal 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.
Thermal 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 Thermal Properties of Matter after the quiz
List the questions you missed from Thermal 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
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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