Thermal Physics Quiz-19

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. An aluminium sphere of 20 cm diameter is heated from 0°C to 100°C.Its volume changes by (given that coefficient of linear expansion for aluminium(αAl=23×10-6/℃) :
  •  28.9 cc
  •  2.89 cc
  •  9.28 cc
  •  49.8 cc
Cubical expansion ∆V = γV∆T ∆V = 3αV∆T = 3×23×10-6× (4/3 π×103 )×100 = 28.9cc

Q2. Two spherical black bodies of radii r1 and r2 and with surface temperature T1 and T2 respectively radiate the same power. Then the ratio of r1 and r2 will be
  •  (T2/T1 )2
  •  (T2/T1 )4
  •  (T1/T2 )2
  •  (T1/T2 )4
For black body, P=AεσT4. For same power A∝1/T4 ⇒(r1/r2 )2=(T2/T1 )4⇒r1/r2 =(T2/T1 )4

Q3. The ratio of energy of emitted radiation of a black body at 27℃ and 927℃ is
  •  1 : 4
  •  1 : 16
  •  1 : 64
  •  1 : 256
Q1/Q2 =(T1/T2 )4=((273+27)/(273+927))4=(1/4)4=1/256

Q4. If the temperature difference on the two sides of a wall increases from 100℃ to 200℃, its thermal conductivity?
  •  Remains unchanged
  •  Is doubled
  •  Is halved
  •  Becomes four times
Thermal conductivity is independent of temperatures of the wall, it is a constant for the material, so it will remain unchanged

Q5. When the temperature of a rod increases from t to t+∆t, its moment of inertia increases from I to I+∆I. If α be the coefficient of linear expansion of the rod, then the value of ∆I/I is.
  •  2α∆t
  •  α∆t
  •  α∆t/2
  •  ∆t/α
 Moment of inertia of a rod, I=1/12 ML2…(i) Where M is the mass of the rod and L is the length of the rod ∴∆I=1/12 2ML∆L (∵M is a constant)…(ii) Divide (ii) by (i), we get ∆I/I=2∆L/L…(iii) As ∆L=L α∆t Or ∆L/L=α∆t Substituting the value of ∆L/L in (iii), we get ∆I/I=2α∆t

Q6. A solid sphere and a hollow sphere of the same material and size are heated to the same temperature and allowed to cool in the same surroundings. If the temperature difference between each sphere and its surroundings is T, then?
  •  The hollow sphere will cool at a faster rate for all values of T(
  •  The solid sphere will cool at a faster rate for all values of T
  •  Both spheres will cool at the same rate for all values of T
  •  Both spheres will cool at the same rate only for small values of T
Rate of cooling ∆θ/t=(Aεσ(T4-T04))/mc As surface area, material and temperature difference are same, so rate of loss of heat is same in both, the spheres. Now in this case rate of cooling depends on mass ⇒ Rate of cooling ∆θ/t∝1/m ∵msolid>mhollow. Hence hollow sphere will cool fast .

Q7. Two circular discs A and B with equal radii are blackened. They are heated to some temperature and are cooled under identical conditions. What inference do you draw from their cooling curves?

  •  A and B have same specific heats
  •  Specific heat of A is less
  •  Specific heat of B is less
  •  Nothing can be said
According to Newton’s law of cooling, rate of cooling is given by ((-dT)/dt)=eAσ/mc(T4-T04) wherec is specific heat of material. or ((-dT)/dt)∝1/c ie., rate of cooling varies inversely as specific heat. From the graph, for A rate of cooling is larger. Therefore, specific heat of A is smaller.

Q8. A quantity of heat required to change the unit mass of a solid substance, from solid state to liquid state, while the temperature remains constant, is known as
  •  Latent heat
  •  Sublimation
  •  Hoar frost
  •  Latent heat of fusion
Latent heat of fusion

Q9. A black body emits radiations of maximum intensity for the wavelength of 5000Å when the temperature of the body is 1227℃. If the temperature of the body is increased by 1000℃, the maximum intensity would be observed at
  •  1000Å
  •  2000Å
  •  5000Å
  •  3000Å
According to Wien’s displacement law, λm T=constant or λm∝1/T or (λm )1/(λm )2 =T2/T1 ∴5000/(λm )2 =(2227+273)/(1227+273) or 5000/(λm )2 =2500/1500 ∴(λm )2=3000 Å

Q10. The maximum wavelength of radiation emitted at 2000K is 4μm. What will be the maximum wavelength of radiation emitted at 2400 K?:
  •  3.33μm
  •  0.66μm
  •  1μm
  •  1m
∴λ(m2 )(m1 ) =T1/T2 ⇒λ(m2 )=2000/2400×4=3.33 μm

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,
Thermal Physics Quiz 19
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