Work Power and Energy Quiz-5

Dear Readers,

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. 

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. 

Q1. Two springs have force constants k1and k2. There are extended through the same distance x. If their elastic energies are E1 and E2, then E1/E2 is equal to
  •  k1:k2
  •  k2:k1
  •  √(k1):√(k2)
  •  k12:k22
(a) E=1/2 kx2 ∴ E∝k ∴ E1/E2 =k1/k2

Q2.A position dependent force F=7-2x+3x2 newton acts on a small body of mass 2 kg and displaces it from x=0to x=5m. The work done in joules is
  •  70
  •  270
  •  35
  •  135

Q3.  An automobile weighing 1200 kg climbs up a hill that rises 1m in 20s. Neglecting frictional effects. The minimum power developed by the engine is 9000 W. If g=10ms-2, then the velocity of the automobile is
  •  36 km h-1
  •  54 km h-1
  •  72 km h-1
  •  90 km h-1
(b) Minimum force mg sin⁡θ, so, minimum power is given by P=mg sin⁡θ v or v=P/(mg sin⁡θ ) or v=(9000×2)/(1200×10×1) ms-1=15ms-1 =15×18/5=54 kmh-1

Q4. A mass of M kg suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of 450with the initial vertical direction is
  •  Mg(√2 +1)
  •  Mg√2
  •  Mg/√2
  •  Mg(√2-1)
(d) Here, the constant horizontal force required to take the body from position 1 to position 2 can be calculated by using work energy theorem. 

Let us assume that body taken slowly so that its speed doesn’t change, then ∆K=0 =WF+WMg+Wtension (symbols have their usual meanings ) WF=F×l sin⁡45°, WMg=Mg(l-l cos⁡〖45°),Wtension=0 ∴ F=Mg(√2-1)

Q5.A body of mass 10 kg is moving on a horizontal surface by applying a force of 10 N in forward direction. If body moves with constant velocity, the work done by force of fiction for a displacement of 2m is
  •  -20J
  •  10J
  •  20J
  •  5J
 (a) Since body moves with constant velocity, so. Net force on the body is zero. Here, N=mg,F=f ∴W=F ⃗.s ⃗=fs cos⁡180'' =fs=-10×2=-20 J

Q6. The pointer reading v/s load graph for a spring balance is as given in the figure. The spring constant is

  •  0.1 kg/cm
  •  5 kg/cm
  • 0.3 kg/cm
  •  1 kg/cm
(a) Spring constant k=F/x= Slope of curve ∴k=(4-1)/30=3/30=0.1 kg/cm

Q7.A ball dropped from a height of 2m rebounds to a height of 1.5 m after hitting the ground. Then the percentage of energy lost is
  •  25
  •  30
  •  50
  •  100
(a) U1=mgh1 and U2=mgh2 % energy lost =(U1-U2)/U1 ×100 =(mgh1-mgh2)/(mgh1 ) 100=((h1-h2)/h1)×100 =(2-1.5)/2×100=25%

  •  2
  •  4
  •  6
  •  8

Q9. Which of the following statements is wrong?
  •  KE of a body is independent of the direction of motion
  •  In an elastic collision of two bodies ,the momentum and energy of each body is conserved
  •  If two protons are brought towards each other the PE of the system decreases.
  •  A body cannot have energy without momentum
(c) If momentum is Zero ie, if p=0,then kinetic energy K=p2/2m=0 But potential energy cannot be zero, thus a body can have energy without momentum.

Q10. Which of the following graphs show variation of potential energy (U) with position x.



(c) The variation of potential energy(U) With distance(x)is U=1/2 kx2 Hence, parabolic graph is obtained.

author image

Written by: AUTHORNAME


Want to know more

Please fill in the details below:


Latest IITJEE Articles$type=three$c=3$author=hide$comment=hide$rm=hide$date=hide$snippet=hide

Latest NEET Articles$type=three$c=3$author=hide$comment=hide$rm=hide$date=hide$snippet=hide


Admissions,1,Alternating Current,60,AP EAMCET 2020,1,Basic Maths,2,BCECE 2020,1,best books for iit jee,2,best coaching institute for iit,1,best coaching institute for iit jee preparation,1,best iit jee coaching delhi,1,best iit jee coaching in delhi,2,best study material for iit jee,4,BITSAT Registration 2020,1,Blog,62,books for jee preparation,1,books recommended by iit toppers,3,Capacitance,3,CBSE,1,CBSE accounts exam,1,CBSE boards,1,CBSE NEET,9,cbse neet 2019,3,CBSE NEET 2020,1,cbse neet nic,1,Centre of Mass,2,Chemistry,58,Class 12 Physics,15,coaching for jee advanced,1,coaching institute for iit jee,2,Collision,2,COMEDK UGET 2020 Application Form,1,COMEDK UGET 2020 Exam Form,1,COMEDK UGET news,1,CUCET 2020,2,Current Electricity,4,CVR college,1,Digestion and Absorption Notes PDF,1,Electromagnetic Induction,3,Electronics,1,Electrostatics,3,Energy,1,Engineering & Medical,1,Fluid Mechanics,4,Gravitation,2,GUJCET 2020 Application Form,1,Heat,4,iit admission,1,iit advanced,1,iit coaching centre,3,iit coaching centre in delhi,2,iit coaching classes,2,iit coaching in delhi,1,iit coaching institute in delhi,1,iit entrance exam,1,iit entrance exam syllabus,2,iit exam pattern,2,iit jee,5,iit jee 2019,3,iit jee advanced,2,iit jee books,3,iit jee coaching,2,iit jee exam,3,iit jee exam 2019,1,iit jee exam pattern,3,iit jee institute,1,iit jee main 2019,2,iit jee mains,3,iit jee mains syllabus,2,iit jee material,1,iit jee online test,3,iit jee practice test,3,iit jee preparation,6,iit jee preparation in delhi,2,iit jee preparation time,1,iit jee preparation tips by toppers,2,iit jee question paper,1,iit jee study material,3,iit jee study materials,2,iit jee syllabus,2,iit jee syllabus 2019,2,iit jee test,3,iit preparation,2,iit preparation books,5,iit preparation time table,2,iit preparation tips,2,iit syllabus,2,iit test series,3,IITJEE,100,Important Biology Notes for NEET Preparation,1,IPU CET,1,JEE Advanced,83,jee advanced exam,2,jee advanced exam pattern,1,jee advanced paper,1,JEE Books,1,JEE Coaching Delhi,3,jee exam,3,jee exam 2019,6,JEE Exam Pattern,2,jee exam pattern 2019,1,jee exam preparation,1,JEE Main,85,jee main 2019,4,JEE Main 2020,1,JEE Main 2020 Application Form,2,JEE Main 2020 news,2,JEE Main 2020 Official Answer Key,1,JEE Main 2020 Registration,1,JEE Main 2020 Score,1,JEE Main application form,1,jee main coaching,1,JEE Main eligibility criteria,3,jee main exam,1,jee main exam 2019,3,jee main online question paper,1,jee main online test,3,JEE Main Paper-2 Result,1,jee main registration,2,jee main syllabus,2,JEE mains 2020,1,jee mains question bank,1,jee mains test papers,3,JEE Mock Test,2,jee notes,1,jee past papers,1,JEE Preparation,2,jee preparation in delhi,1,jee preparation material,4,JEE Study Material,1,jee syllabus,6,JEE Syllabus Chemistry,1,JEE Syllabus Maths,1,JEE Syllabus Physics,1,jee test series,3,KCET - 2020,1,Kinematics,1,Latest article,5,Latest Articles,61,Latest News,34,latest news about neet exam,1,Laws of Motion,2,Magnetic Effect of Current,3,Magnetism,3,MHT CET 2020,2,MHT CET 2020 exam schedule,1,Modern Physics,1,NCERT Solutions,15,neet,3,neet 2019,1,neet 2019 eligibility criteria,1,neet 2019 exam date,2,neet 2019 test series,2,NEET 2020,2,NEET 2020 Application Form,1,NEET 2020 Eligibility Criteria,1,NEET 2020 Registration,1,neet application form,1,neet application form 2019 last date,1,Neet Biology Syllabus,1,Neet Books,3,neet eligibility criteria,3,neet exam 2019,7,neet exam application,1,neet exam date,1,neet exam details,1,neet exam pattern,6,neet exam pattern 2019,2,neet examination,1,neet mock test 2019,1,Neet Notes,3,Neet Online Application Form,3,neet online test,2,neet past papers,1,neet physics syllabus,1,neet practice test,2,NEET preparation books,1,neet qualification marks,1,NEET question paper 2019,1,neet question papers,1,neet registration,1,Neet Study Material,3,neet syllabus,6,neet syllabus 2019,5,NEET Syllabus 2020,1,neet syllabus chemistry,1,neet syllabus for biology,1,neet syllabus for physics,1,neet test series,1,neet ug 2019,2,news,5,online study material for iit jee,1,Optical Instruments,1,Physics,110,physics books for iit jee,1,Power,1,Practical Physics,1,Quiz,5,Ray Optics,1,Rotational Motion,3,SHM,3,Simple Harmonic Motion,3,study materials for iit jee,1,Study Notes,110,study notes for iit jee,1,Thermodynamics,4,TS EAMCET Notification,2,Units and Dimensions,1,UPSEE 2020,1,UPSEE 2020 Application Form,2,UPSEE EXAM,1,Vectors,2,VITEE Application form,1,Wave Motion,3,Wave Optics,1,WBJEE 2020 Admit Card,1,WBJEE 2020 Answer Key,1,Work,1,
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS CONTENT IS PREMIUM Please share to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy