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Q38 (NDA-II/2015) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Thermal physics Answer Verified

Which one of the following statements is not correct?

Result
Your answer: —  Â·  Correct: D
Explanation

Statement 4 is incorrect because the temperature at which a solid changes into a liquid is defined as the melting point [5]. The boiling point is the temperature at which a liquid changes into a gas. Regarding the other options: Conduction is most efficient in solids where particles are closely packed, less so in liquids, and very poor in gases due to large inter-particle distances [5]. Convection involves the actual movement of particles in fluids (liquids and gases) to carry heat energy [4]. Radiation is the transfer of heat energy via electromagnetic waves, which does not require a material medium and can occur through a vacuum [4]. Therefore, while statements 1, 2, and 3 accurately describe heat transfer mechanisms, statement 4 incorrectly identifies the phase change temperature.

Sources

  1. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 7: Particulate Nature of Matter > Activity 7.3 : Let us find out > p. 103
  2. [5] https://gml.noaa.gov/outreach/info_activities/pdfs/TBI_heat_transfer.pdf
  3. [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 7: Heat Transfer in Nature > In a Nutshell > p. 101
  4. [4] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 7: Particulate Nature of Matter > Ever heard of ... > p. 112
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