Change set

Pick exam & year, then Go.

Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q1 (NDA-I/2018) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Thermal physics Answer Verified

Which one of the following statements is correct ?

Result
Your answer: —  Â·  Correct: A
Explanation

In thermodynamics, heat is strictly defined as energy in transit due solely to a macroscopic temperature difference between two systems or objects.

  • Option A: Correct. If energy is transferred by means other than a temperature difference (e.g., mechanical work, electrical work), it is not classified as heat.
  • Option B: Incorrect. Energy can be transferred via work without requiring any temperature difference.
  • Option C: Incorrect. Heating typically causes thermal expansion, which increases an object's length and volume.
  • Option D: Incorrect. Even when a temperature difference exists, energy can still be transferred simultaneously via work or mass transfer.
How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
50%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

NDA-II · 2015 · Q38 Relevance score: 5.30

Which one of the following statements is not correct?

NDA-II · 2017 · Q62 Relevance score: 4.44

Which one of the following statements about energy is correct ?

CDS-I · 2006 · Q17 Relevance score: 4.35

Which one of the following statements is correct ? Transfer of heat energy from a heater coil to the cooking vessel takes place through the process of

CDS-I · 2023 · Q105 Relevance score: 4.15

Consider the following statements and identify the correct answer using the code given below: 1. In a thermal power station, fuels such as oil, coal, or natural gas are used to generate electricity. 2. Fuels are burned to heat water and turn it into steam, which goes through a turbine, which spins and turns, generating electricity.

IAS · 2023 · Q64 Relevance score: 3.95

Consider the following statements : Statement-I : The temperature contrast between continents and oceans is greater during summer than in winter. Statement-II : The specific heat of water is more than that of land surface. Which one of the following is correct in respect of the above statements?