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Efficiency Questions

Practice 17 Efficiency questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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Practice by Exam:Physics(8)Quantitative Aptitude(8)Mathematics(1)

About Efficiency — practice questions, PYQs & concepts

Efficiency is a frequently-tested topic on Physics, Quantitative Aptitude, Mathematics. ExamTest.live currently lists 17 Efficiency questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Efficiency weight in competitive exams

Across our Efficiency question bank, the largest sources are Physics (8), Quantitative Aptitude (8) and Mathematics (1). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 0 easy Efficiency questions are available — build fluency before moving up.
  • Target weak years: Use the year filter to focus on the most recent 2026 paper or older PYQs you have not attempted.
  • Time yourself: Every question shows the average solve time so you can benchmark your speed against other students.
  • Read every explanation: Even on questions you got right — the explanation often surfaces a faster approach you can reuse.

All Efficiency Questions(1–17 of 17)

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Q1mediummcqQuantitative AptitudeCompetitive Exam2026
0% accuracy
A, B and C can do the same work in 9 days, 12 days and 18 days, respectively. A started the work and worked for 3 days and left. Then, B joined the work and worked for 3 days and left. Then, C joined the work and completed the work. Find the number of days C took to complete the work.
Q2mediummcqQuantitative AptitudeCompetitive Exam2026
0% accuracy
A and B can complete a piece of work in days. B and C can do it in days. A and C can do it in days. A, B and C together can complete it in how many days?
Q3mediummcqQuantitative AptitudeSSC Selection Post 2018 Higher Secondary Level2026
0% accuracy
A, B से ती न गुना अधि क का र्य कुशल है। यदि B कि सी का म को पूरा करने में 45 दि न का समय लेता है, तब समा न का म को पूरा करने में A कि तने दि न लेगा ?
Q4mediummcqMathematicsCompetitive Exam2026
Komal can do a work in days. Bimal is more efficient than Komal in doing the work. In how many days Bimal will do that work?
Q5mediummcqQuantitative AptitudeSSC CGL2026
The ratio of efficiencies of and for doing a certain work is . Working together they can complete the work in days. alone will complete of that work in:
Q6mediummcqQuantitative AptitudeCompetitive Exam2026
A and B working together can complete a job in 30 days. The ratio of their efficiencies is 3:2. In how many days can the faster person complete the job?
Q7mediummcqQuantitative AptitudeCompetitive Exam2026
A can do a certain job in 12 days. B is 60% more efficient than A. To do the same job B alone would take:
Q8mediummcqQuantitative AptitudePrepp2026
Arvind works times as fast as Suresh. If Suresh can complete a work in days independently, then find the number of days in which Arvind and Suresh can together finish the work.
Q9mediummcqQuantitative AptitudePrepp2026
A can complete a piece of work alone in , while B can complete the same piece of work alone in . In every three-day cycle, both A and B work on day 1, only A works on day 2, and only B works on day 3. This cycle continues till the work is completed. How many days in all does it take the duo to complete the work?
Q10mediummcqPhysicsAIEEE 20122026
Helium gas goes through a cycle (consisting of two isochoric and two isobaric lines) as shown in figure. The pressure and volume at are and at are . Efficiency of this cycle is nearly:
image
Q11mediummcqPhysicsAIEEE 20032026
A carnot engine takes of heat from a reservoir at , and gives it to a sink at . The work done by the engine is:
Q12mediummcqPhysicsAIEEE2026
The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is:
image
Q13mediummcqPhysicsNEET 20212026
Water falls from a height of at the rate of to operate a turbine. The losses due to frictional force are of the input energy. How much power is generated by the turbine? ()
Q14mediummcqPhysicsNEET (UG) 20182026
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is:
Q15mediummcqPhysicsPhysics
Water falls from a height of at the rate of to operate a turbine. The losses due to frictional forces are of the energy. How much power is generated by the turbine? (Take )
Q16mediummcqPhysicsPhysics
A sodium street lamp emits yellow light of wavelength . Assuming it to be efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is:
Q17mediummcqPhysicsPhysics
A input is supplied to a transformer. The output circuit draws a current of at . If the efficiency of the transformer is , the current drawn by the primary windings of the transformer is:

Frequently Asked Questions

How many Efficiency questions are on ExamTest.live?▼
We have 17 Efficiency questions spread across 1 pages, covering easy, medium, and hard difficulty levels with detailed explanations.
Are Efficiency MCQs free?▼
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Which exams include Efficiency questions?▼
Efficiency questions are commonly asked in Physics, Quantitative Aptitude, Mathematics. You can filter by exam using the links above.
How do I practice Efficiency questions effectively?▼
Start with easy questions to build confidence, then tackle medium and hard ones. Use the filter buttons to sort by difficulty. Reveal the answer only after attempting each question, and read the explanation thoroughly.