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Efficiency Questions

Practice 35 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:Quantitative Aptitude(25)Physics(9)Mathematics(1)

About Efficiency — practice questions, PYQs & concepts

Efficiency is a frequently-tested topic on Quantitative Aptitude, Physics, Mathematics. ExamTest.live currently lists 35 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 Quantitative Aptitude (25), Physics (9) and Mathematics (1). Click any exam chip above to drill down to that exam-specific question set.

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All Efficiency Questions(1–35 of 35)

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Q1mediummcqQuantitative AptitudeCompetitive Exam2026
7% 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 is 40% more efficient than B. If B finishes a work in 14 days, then in how many days will A finish the same work?
Q3mediummcqQuantitative AptitudeCompetitive Exam2026
25% accuracy
A, B and C can do one-third of a work in 15 days, 30 days and 10 days, respectively. A started the work. C joined him after 1 day and B joined them after 3 days of the beginning. For how many days did C work?
Q4mediummcqQuantitative 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 ?
Q5mediummcqQuantitative AptitudeCompetitive Exam2026
0% accuracy
A can finish as much work in 6 days as C can in 8 days. B can finish as much work in 6 days as C can in 4 days. How much time will B require to finish a work if A takes 54 days to finish it?
Q6mediummcqQuantitative AptitudeSSC CGL2026
0% accuracy
To do a certain work, A is 40% more efficient than B. Working together, they can do the same work in 15 days. A started the work and left after 15 days. B and C together completed the remaining work in next 10 days. C alone can do one-third of the original work in:
Q7mediummcqPhysicsGeneral Knowledge2026
0% accuracy
What is the efficiency of currently available commercial solar cells?
Q8mediummcqQuantitative AptitudeSSC CGL2026
0% accuracy
A is 40% more efficient than B. If B alone can complete a work in 42 days, then A alone can complete the same work in how many days?
Q9mediummcqQuantitative AptitudeSSC CGL2026
0% accuracy
A does of a work in 15 days. He then calls B, and they together finish the remaining work in 5 days. How long B alone would take to do the whole work?
Q10mediummcqQuantitative AptitudeSSC CGL2026
A can do a certain work in 40 days. B is 60% more efficient than A. Both work together for 10 days. C alone completes the remaining work in 10
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1
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days. Working together, B and C can complete 44% of the original work in:
Q11mediummcqQuantitative AptitudeWBCS Prelims2026
is twice as good a workman as . and together complete a piece of work in . In how many days will alone do the same piece of work?
Q12mediummcqQuantitative AptitudeCompetitive Exam2026
Komal can do a work in days. Bimal is more efficient than Komal in doing the work. In how many days will Bimal do that work?
Q13mediummcqQuantitative AptitudeCompetitive Exam2026
Reena and Riya together can complete a piece of work in 36 days. Riya and Geeta together can complete it in 54 days. Reena and Geeta together can complete it in 81 days. In how many days can Reena alone complete the work?
Q14mediummcqQuantitative AptitudeStaff Selection Commission2026
X is 25% more efficient than Y. If Y alone can make a chair in 10 days, then X alone can make the chair in how many days?
Q15mediummcqQuantitative AptitudeSSC CGL2026
and can do a project in and days respectively. In how many days can they complete of the project if they work together?
Q16mediummcqQuantitative AptitudeCompetitive Exam2026
A is half as efficient as B who is thrice as efficient as C. In how many days can all of them complete a task if B can complete the task alone in days?
Q17mediummcqQuantitative AptitudeCompetitive Exam2026
A is twice as good a workman as B. A and B together complete a piece of work in days. In how many days will A alone do the same piece of work?
Q18mediummcqQuantitative AptitudeCompetitive Exam2026
men or women can do a piece of work in days. The number of days needed to complete the job, if men and women are employed to do the same piece of work is:
Q19mediummcqQuantitative AptitudeCompetitive Exams2026
Murad can do a piece of work in hours. If he is joined by Joel who is more efficient, in what time will they together finish the work?
Q20mediummcqQuantitative AptitudePractice Test2026
Manav and Manu can complete a piece of work in days and days, respectively. They worked together for days, after which Manav leaves. In how many days can Manu finish the remaining work?
Q21mediummcqQuantitative AptitudeCompetitive Exam2026
A machine can complete double the work that a man can complete in a given period of time. To complete a work, 10 machines and 5 men take 60 days. If there were 10 men and 5 machines, then the time it would have taken to complete the work is:
Q22mediummcqQuantitative 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:
Q23mediummcqQuantitative 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?
Q24mediummcqQuantitative 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:
Q25mediummcqQuantitative 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.
Q26mediummcqQuantitative 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?
Q27mediummcqMathematicsCompetitive 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?
Q28mediummcqPhysicsAIEEE 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
Q29mediummcqPhysicsAIEEE 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:
Q30mediummcqPhysicsAIEEE2026
The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is:
image
Q31mediummcqPhysicsNEET 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? ()
Q32mediummcqPhysicsNEET (UG) 20182026
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is:
Q33mediummcqPhysicsPhysics
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:
Q34mediummcqPhysicsPhysics
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:
Q35mediummcqPhysicsPhysics
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 )

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