NEET UG · Physics · Thermodynamics
Carnot Engine: NEET previous year questions
3 questions in ten years of NEET, in 3 of 10 papers. Pattern: Most years. Here is how it is asked and which ideas come back.
- Asked in 10 years
- 3
- about 0.3 per paper
- Years asked
- 3/10
- last asked 2023
- Weighted estimate
- 0.2
- model; history: 0.3 a paper on average, typically 0–1
Key findings
- 01
Asked in 3 of 10 papers, 3 questions in all: #177 of 204 topics by ten-year total. It comes back every 3.0 years on average. Last asked in 2023.
- 02
100% of its questions since 2018 tested an idea never asked before; none repeated an idea from the year before.
- 03
No idea in this topic has been asked twice: every question tested something new.
- 04
NEET has asked 3 of the 95 ideas in this topic; 90 have never been asked, directly or indirectly.
- 05
Mostly asked as numerical (100%); 67% easy, 0% hard, and down from 0.4 to 0.0 questions a paper since 2024.
Questions per year
- Up to 2023
- 0.4
- per paper
- Since 2024
- 0.0
- -0.4
- Usual gap
- 3.0 yrs
- between papers asking it
- Swing
- ±0.5
- questions, year to year
How it is asked
Difficulty, format and skill
Across all 3 questions on Carnot Engine since 2017.
Difficulty
QUESTIONS- Easy2 · 67%
- Medium1 · 33%
- Hard0 · 0%
Format
SHARE- Numerical · 3 Q100%
Skill tested
SHARE- Calculation · 3 Q100%
Repeats
New idea, or one asked before?
Each column is a paper. Blue questions tested an idea NEET had not asked before; navy ones went back to an idea from an earlier paper. 2017 is the first paper, so everything in it counts as new.
- Idea asked for the first time
- Idea asked in an earlier paper
Coverage of the topic
NEET has asked 3 of the 95 ideas in this topic. 90 have never been asked yet.
- Asked directly3 · 3%
- Touched inside another question2 · 2%
- Never asked90 · 95%
Ideas come from Lumi’s syllabus map of NCERT. A never-asked idea is not a safe skip: most new questions come from exactly these.
Drill down
Idea, year, question
Every idea NEET tested in this topic, with its ten papers. Open one to read the questions.
- 1 · 33%
- 2018 · Q4The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
easyNumericalNew idea
- 2018 · Q4
- 1 · 33%
- 1 · 33%
Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.
Ideas
Every idea inside this topic
3 different ideas were tested; none came more than once. Efficiency Definition is the foundation for 47 other ideas in the syllabus.
- Efficiency Definition1×
numerical
Numerical · 4% next · foundation for 47 - Carnot Efficiency Formula1×
numerical
Numerical · 4% next · foundation for 36 - Refrigerator COP Definition1×
numerical
Numerical · 4% next · foundation for 21
Chance next is the historical rate at which an idea with this record came back in the following paper. It is low for every idea, which is why learning the topic beats memorising past questions. All repeated ideas
Every question
Carnot Engine questions, year by year
The opening words of each question as it appeared in the official paper, with the idea it tested.
NEET 20231 question
- Q26A Carnot engine has an efficiency of 50% when its source is at a temperature 327° C. The temperature of the sink is :
Idea: Efficiency Definition
New ideaEasyNumerical
NEET 20181 question
- Q4The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
Idea: Carnot Efficiency Formula
New ideaEasyNumerical
NEET 20171 question
- Q27A carnot engine having an efficiency of as heat engine, is used as a refrigerator. If the work done on the system is 10 J,…
Idea: Refrigerator COP Definition
MediumNumerical
Questions from the official NEET UG papers published by NTA (CBSE before 2019). Topic and idea tags, counts and notes are Lumi’s.