9394949438

[LATEST]$type=sticky$show=home$rm=0$va=0$count=4$va=0






Work,Energy and Power Quiz-17

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. Statement I In an elastic collision between two bodies, the relative speed of the bodies after collision is equal to the relative speed before the collision. Statement II In an elastic collision, the linear momentum of the system is conserved.?
  •  Statement I is true ,statement II is true; statement II is a correct explanation for statement I
  •  Statement I is true, Statement II is true; statement II is not correct explanation for statement I.
  •  Statement I is true, Statement II is false .
  •  Statement I is false, Statement II is True
Solution
In case of elastic collision ,coefficient of restitution e=1 or Relative speed of approach =relative speed of separation. ∴ Option (b) is correct.

Q2. A force acts on a 30 g particle in such a way that the position of the particle as a function of time is given by x=3t-4t2+t3, where x is in metres and t is in seconds. The work done during the first 4 seconds is?
  •  5.28 J
  •  450 mJ
  •  190 mJ
  •  530 mJ
Solution
v= dx/dt=3-8t+3t2 ∴v0=3 m/s and v4=19 m/s W=1/2 m(v42-v02) [According to work energy theorem] =1/2×0.03×(192-32 )=5.28 J

Q3. A ball is released from the top of a tower. The ratio of work done by force of gravity in first, second and third second of the motion of the ball is?
  •  1:2:3
  •  1:4:9
  •  1:3:5
  •  1:5:3
Solution
When the ball is released from the top of tower then ratio of distances covered by the ball in first, second and third second hI:hII:hIII=1:3:5: [Because hn∝(2n-1)] ∴ Ratio of work done mghI:mghII:mghIII=1:3:5

Q4. A spring with spring constant k is extended from x=0 to x=x1.The work done will be?
  •  κx12
  •  1/2 κx12
  •  2κx12
  •  2κx1
Solution
REPLACE DIAGRAM

Q5. A smooth sphere of mass M moving with velocity u directly collides elastically with another sphere of mass m at rest. After collision their final velocities are V and v respectively. The value of v is ?
  •  2uM/m
  •  2um/M
  •  2u/(1+m/M)
  •  2u/(1+M/m)
Solution
 

v2=((m2-m1)/(m1+m2 )) u2+(2m1 u1)/(m1+m2 )=2mu/(M+m)=2u/(1+m/M)


Q6. If a force F is applied on a body and it moves with a velocity v, the power will be?
  •  F×v
  •  F/v
  •  F/v2
  •  F×v2
Solution
F×v

Q7. The work done in pulling up a block of wood weighing 2 kN for a length of 10 m on a smooth plane inclined at an angle of 15° with the horizontal is [sin⁡15°=0.2588]?
  •  4.36 kJ
  •  5.17 kJ
  •  8.91 kJ
  •  9.82 kJ
Solution
W=mg sin⁡θ×s =2×103×sin⁡15°×10 =5.17 kJ

Q8. A wire is stretched under a force. If the wire suddenly snaps the temperature of the wire?
  •  Remains the same
  •  Decreases
  •  Increases
  •  First decreases then increases
Solution
Work done on the wire to strain it will be stored as energy which is converted to heat. Therefore the temperature increases

Q9. A mass of 100 g strikes the wall with speed 5 m/s at an angle as shown in figure and it rebounds with the same speed. If the contact time is 2×10-3 sec, what is the force applied on the mass by the wall?

  •  250√3 N to right
  •  250 N to right
  •  250√3 N to left
  •  250 N to left
Solution
Force = Rate of change of momentum Initial momentum P 1=mv sin⁡θ i ̂+mv cos⁡θ j ̂ Final momentum P 2=-mv sin⁡θ i ̂+mv cos⁡θ j ̂ ∴F =(∆P )/∆t=(-2mv sin⁡θ)/(2×10-3 ) Substituting m=0.1 kg,v=5 m/s,θ=60° Force on the ball F =-250√3 N Negative sign indicates direction of the force

Q10. A bullet of mass 0.02 kg travelling horizontally with velocity 250 ms-1 strikes a block of wood of mass 0.23 kg which rests on a rough horizontal surface. After the impact, the block and bullet move together and come to rest after travelling a distance of 40m. The coefficient of sliding friction of the rough surface is ( g=9.8 ms-2)?:
  •  0.75
  •  0.61
  •  0.51
  •  0.30
Solution
After impact the mass and block move together and come to rest after a distance of 40 m By conservation of momentum, m1 u1+m2 u2=m1 v1+m2 v2 0.02×250+0.23×0=0.02v+0.23v 5+0=v(0.25)

500/25=v=20 ms-1 Now, by conservation of energy, 1/2 Mv2=μR.d 1/2×0.25×400=μ×0.25×9.8×40⇒μ=0.51

Want to know more

Want to Know More
Please fill in the details below:

INNER POST ADS

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

Name

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,Electromagnetic Induction,3,Electronics,1,Electrostatics,3,Energy,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,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,
ltr
item
BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET, IIT JEE COACHING INSTITUTE: Work,Power and Energy Quiz 17
Work,Power and Energy Quiz 17
https://1.bp.blogspot.com/-3uqeBlDxvEo/X6gzTpTrQHI/AAAAAAAADSs/jEuOj1NEDcAJfzcPoytBAjk9q9NrN1b9ACLcBGAsYHQ/w517-h272/Quiz%2BImage%2BTemplate%2B%252816%2529%2B%25282%2529.jpg
https://1.bp.blogspot.com/-3uqeBlDxvEo/X6gzTpTrQHI/AAAAAAAADSs/jEuOj1NEDcAJfzcPoytBAjk9q9NrN1b9ACLcBGAsYHQ/s72-w517-c-h272/Quiz%2BImage%2BTemplate%2B%252816%2529%2B%25282%2529.jpg
BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET, IIT JEE COACHING INSTITUTE
https://www.cleariitmedical.com/2020/11/WorkPowerEnergyQuiz17.html
https://www.cleariitmedical.com/
https://www.cleariitmedical.com/
https://www.cleariitmedical.com/2020/11/WorkPowerEnergyQuiz17.html
true
7783647550433378923
UTF-8
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