Heat MCQs (301–330) with Answers and Explanations help students revise advanced basics of heat, thermal conductivity, and real-life applications for objective exams.
This set is designed for quick practice of important Heat chapter questions covering conduction, convection, radiation, and calorimetry concepts.
301. The transfer of heat from one particle to another without movement of the particles is called:
Correct Answer: A
Conduction transfers heat through direct contact without bulk movement.
302. The heat transfer that occurs due to bulk motion of a fluid is called:
Correct Answer: B
Convection happens due to movement of liquid or gas particles.
303. Heat transfer that can occur in vacuum is:
Correct Answer: C
Radiation does not require any medium for heat transfer.
304. Which of the following is a poor conductor of heat?
Correct Answer: D
Wood is an insulator and does not conduct heat well.
305. Which of the following is the best conductor of heat?
Correct Answer: B
Silver has very high thermal conductivity.
306. The unit of thermal conductivity is:
Correct Answer: A
Thermal conductivity is measured in W/mK.
307. The coefficient of linear expansion is defined as:
Correct Answer: C
Linear expansion is change in length per unit length per degree rise.
308. The coefficient of cubical expansion is related to coefficient of linear expansion by:
Correct Answer: B
For isotropic solids, cubical coefficient is approximately three times linear.
309. The coefficient of areal expansion is approximately:
Correct Answer: C
Areal coefficient is approximately 2α for isotropic solids.
310. A bimetallic strip is used in:
Correct Answer: D
Bimetallic strips work in thermostats due to different expansions.
311. The phenomenon that explains why ice floats on water is:
Correct Answer: B
Water expands on cooling below 4°C, making ice less dense.
312. The maximum density of water occurs at:
Correct Answer: A
Water has maximum density at 4°C.
313. The formula for heat gained/lost is:
Correct Answer: D
Heat is calculated using Q = m × c × ΔT.
314. The specific heat of a substance is defined as:
Correct Answer: A
Specific heat capacity refers to 1 kg mass with 1°C temperature rise.
315. The SI unit of specific heat capacity is:
Correct Answer: B
Specific heat capacity unit is J/kgK (or J/kg°C).
316. Latent heat is the heat required to:
Correct Answer: C
Latent heat is absorbed or released during change of state.
317. The latent heat of fusion is related to the change from:
Correct Answer: A
Fusion means melting, so it is solid changing into liquid.
318. The latent heat of vaporization is related to the change from:
Correct Answer: C
Vaporization means liquid changing into gas.
319. A pressure cooker works by:
Correct Answer: B
Increased pressure raises boiling point and cooks food faster.
320. The rate of heat transfer by conduction is highest in:
Correct Answer: A
Metals have high thermal conductivity, so conduction is fast.
321. The SI unit of latent heat is:
Correct Answer: D
Latent heat is heat per unit mass, so unit is J/kg.
322. The evaporation increases when humidity is:
Correct Answer: B
Low humidity supports faster evaporation.
323. During evaporation, the liquid cools because:
Correct Answer: C
High-energy molecules escape, taking heat away from the liquid.
324. The mode of heat transfer responsible for sea breeze is:
Correct Answer: B
Convection currents due to unequal heating cause sea breeze.
325. The transfer of heat by radiation depends mainly on:
Correct Answer: A
Dark and dull surfaces are better absorbers and emitters of radiation.
326. Which surface absorbs maximum radiant heat?
Correct Answer: D
Dull black surfaces are best absorbers of heat radiation.
327. The function of lagging in steam pipes is to:
Correct Answer: B
Lagging provides insulation and reduces heat transfer to surroundings.
328. The hotter end of a metal rod becomes cool by:
Correct Answer: A
Heat passes through the rod by conduction.
329. Which of the following increases convection?
Correct Answer: C
Heating from below creates convection currents strongly.
330. The correct statement about heat is:
Correct Answer: D
Heat is energy transferred between bodies because of temperature difference.
Heat MCQs (301–330) FAQs
1. What topics are covered in Heat MCQs (301–330)?
This set includes conduction, convection, radiation, thermal expansion, calorimetry, and heat transfer applications.
2. Are these Heat MCQs suitable for school exams?
Yes, these questions help in quick revision and concept-based preparation for Heat chapter tests.
3. Do these Heat MCQs provide explanations for answers?
Yes, every MCQ includes the correct answer with a short explanation for better understanding.
4. How do Heat MCQs improve exam performance?
Practicing objective questions improves accuracy, speed, and conceptual clarity in exams.
5. Can these Heat MCQs help in competitive exams?
Yes, the concepts and question patterns are helpful for basic science objective sections in competitive exams.
This set includes conduction, convection, radiation, thermal expansion, calorimetry, and heat transfer applications.
2. Are these Heat MCQs suitable for school exams?
Yes, these questions help in quick revision and concept-based preparation for Heat chapter tests.
3. Do these Heat MCQs provide explanations for answers?
Yes, every MCQ includes the correct answer with a short explanation for better understanding.
4. How do Heat MCQs improve exam performance?
Practicing objective questions improves accuracy, speed, and conceptual clarity in exams.
5. Can these Heat MCQs help in competitive exams?
Yes, the concepts and question patterns are helpful for basic science objective sections in competitive exams.
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