Download CBSE MCQs for Class 9 Physics: Effect of Heat
Review structured MCQ sets for Class 9 Physics Effect of Heat. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.
Chapter-wise Objective Questions: Effect of Heat
Access the complete set of multiple-choice questions for Effect of Heat below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.
Multiple Choice Questions
(a) the inner surface expands while the outer surface is still cold
(b) glass is a good conductor of heat and expands evenly
(c) hot water dissolves glass
(d) glass contracts on heating
Show Answer & Explanation
Answer: (a) the inner surface expands while the outer surface is still cold
Explanation:
1. Glass is a poor conductor of heat.
2. The inside warms and expands first while the outside has not yet expanded, which sets up stress and cracks the glass.
Teacher's Note:
1. Uneven expansion causes the crack.
(a) decreases
(b) increases
(c) remains the same
(d) first decreases and then increases
Show Answer & Explanation
Answer: (b) increases
Explanation:
1. On heating every linear dimension of the metal increases, including the circumference and radius of the cavity.
2. So the cavity expands as if it were made of the same metal, and its volume increases.
Teacher's Note:
1. A cavity expands like the material around it.
(a) become lighter and slip on easily
(b) melt slightly and stick to the wood
(c) expand and slip over the wheel, then contract and grip it on cooling
(d) lose their ability to contract
Show Answer & Explanation
Answer: (c) expand and slip over the wheel, then contract and grip it on cooling
Explanation:
1. The tyre is slightly smaller than the wheel.
2. Heating expands it so it fits; on cooling it contracts and grips the wheel firmly.
Teacher's Note:
1. Thermal expansion and contraction.
(a) is a good conductor of heat
(b) produces heat of its own
(c) reflects all cold air
(d) traps air in its pores, and air is a poor conductor of heat
Show Answer & Explanation
Answer: (d) traps air in its pores, and air is a poor conductor of heat
Explanation:
1. Wool is porous and the pores are filled with air.
2. Air is a poor conductor, so body heat does not escape easily.
Teacher's Note:
1. Trapped air is an insulator.
(a) stone is a better conductor and takes heat from the feet faster
(b) stone is at a lower temperature than the carpet
(c) carpet produces heat
(d) stone is a bad conductor of heat
Show Answer & Explanation
Answer: (a) stone is a better conductor and takes heat from the feet faster
Explanation:
1. Both are at room temperature.
2. Stone conducts heat away from the feet much faster than carpet does, so it feels cold.
Teacher's Note:
1. The feeling of cold depends on how fast heat leaves the body.
(a) ether is at a very low temperature
(b) ether evaporates quickly, taking the latent heat from the hand
(c) ether absorbs cold from the air
(d) ether condenses on the hand
Show Answer & Explanation
Answer: (b) ether evaporates quickly, taking the latent heat from the hand
Explanation:
1. Ether is highly volatile and evaporates rapidly.
2. The latent heat of vaporisation is drawn from the hand, which therefore cools.
Teacher's Note:
1. Evaporation causes cooling.
(a) cools the sweat by itself
(b) stops the body from producing sweat
(c) speeds up evaporation of sweat, which removes heat from the body
(d) adds moisture to the skin
Show Answer & Explanation
Answer: (c) speeds up evaporation of sweat, which removes heat from the body
Explanation:
1. Moving air carries away water vapour from the skin so sweat evaporates faster.
2. Evaporation takes heat from the body, giving a cooling effect.
Teacher's Note:
1. Faster evaporation means more cooling.
(a) mercury does not contract on cooling
(b) the thermometer is kept in a vacuum
(c) mercury sticks to the glass
(d) a narrow constriction above the bulb prevents it from returning
Show Answer & Explanation
Answer: (d) a narrow constriction above the bulb prevents it from returning
Explanation:
1. A kink (constriction) in the tube just above the bulb holds the mercury thread in the stem.
2. It returns only when the thermometer is shaken.
Teacher's Note:
1. The constriction lets us read the temperature later.
(a) \( -40^\circ \)
(b) \( 0^\circ \)
(c) \( 40^\circ \)
(d) \( -273^\circ \)
Show Answer & Explanation
Answer: (a) \( -40^\circ \)
Explanation:
1. Set \( F=C \) in \( F=\frac95C+32 \): \( C=\frac95C+32 \).
2. \( -\frac45C=32 \), so \( C=-40 \).
Teacher's Note:
1. Solve F = C.
(a) water
(b) mercury
(c) alcohol
(d) kerosene oil
Show Answer & Explanation
Answer: (b) mercury
Explanation:
1. Liquid metals conduct heat well; mercury is a liquid metal.
2. Most other liquids are poor conductors.
Teacher's Note:
1. Metals are good conductors.
(a) the quantity of heat in a body
(b) both temperature and heat
(c) temperature only, not the quantity of heat
(d) the specific heat of a body
Show Answer & Explanation
Answer: (c) temperature only, not the quantity of heat
Explanation:
1. A thermometer measures how hot a body is (temperature).
2. The quantity of heat depends on mass, specific heat and temperature change, and needs a calorimeter.
Teacher's Note:
1. Temperature and heat are different.
(a) the hammer is hot
(b) the nail loses its heat
(c) the nail becomes magnetised
(d) the mechanical energy of the hammer becomes internal energy of the nail
Show Answer & Explanation
Answer: (d) the mechanical energy of the hammer becomes internal energy of the nail
Explanation:
1. The hammer does work on the nail.
2. This energy is transferred to the nail's molecules, raising its internal energy and temperature.
Teacher's Note:
1. Work done is converted to heat.
(a) decreases
(b) increases
(c) remains constant
(d) first increases then decreases
Show Answer & Explanation
Answer: (a) decreases
Explanation:
1. Water shows anomalous expansion between \( 0^\circ \)C and \( 4^\circ \)C.
2. Its volume decreases and its density is maximum at \( 4^\circ \)C.
Teacher's Note:
1. Water has maximum density at 4 degrees Celsius.
Free study material for Science
Practice MCQs for Class 9 Physics Effect of Heat
Chapter MCQs with Answers for Class 9 Physics
Review structured objective questions for Class 9 Physics Effect of Heat. Built according to official CBSE guidelines, these MCQ sets support daily revision and core concept reinforcement.
Expert Practice Material for Class 9 Physics
Each question includes structured solution keys mapped directly to standard CBSE textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.
Complete Your Chapter Revision
Follow up your worksheet practice by attempting the interactive online Physics MCQ test for this chapter to evaluate your execution speed. All platform resources are free to access.
FAQs
You can get most exhaustive CBSE Class 9 Physics Effect of Heat MCQs Set 02 for free on StudiesToday.com. These MCQs for Class 9 Physics are updated for the 2026-27 academic session as per CBSE examination standards.
Yes, our CBSE Class 9 Physics Effect of Heat MCQs Set 02 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the CBSE paper is now competency-based.
By solving our CBSE Class 9 Physics Effect of Heat MCQs Set 02, Class 9 students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Physics.
Yes, Physics MCQs for Class 9 have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused CBSE exams.
Yes, you can also access online interactive tests for CBSE Class 9 Physics Effect of Heat MCQs Set 02 on StudiesToday.com as they provide instant answers and score to help you track your progress in Physics.