Thermal Physics Quiz-15

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 rods of equal length and area of cross-section are kept parallel and lagged between temperature 20℃ and 80℃. The ratio of the effective thermal conductivity to that of the first rod is [the ratio (K1/K2 )=3/4]:
  •  7 : 4
  •  7 : 6
  •  4 : 7
  •  7 : 8
For parallel combination of two rods of equal length and equal area of cross-section. K= (K1+K2)/2= (K1+(4K1)/3)/2 = (7K1)/6 Hence , K/K1 =7/6

Q2. Two plates of same thickness, of coefficients of thermal conductivity K1 and K2 and areas of cross section A1 and A2 are connected as shown in figure. The common coefficient of thermal conductivity K will be

  •  K1 A1+ K2 A2
  •  (K1 A1)/(K2 A2 )
  •  (K1 A1+K2 A2)/(A1+A2 )
  •  (K1 A2+K2 A1)/(K1+K2 )
As is clear from figure. dQ/dt=(dQ1)/dt+(dQ2)/dt K(A1+A2 )dT/dx=K1 A1 dT/dx+K2 A2 dT/dx K= (K1 A1+K2 A2)/(A1+A2 )

Q3. Calorie is defined as the amount of heat required to raise temperature of 1 g of water by 1 ℃ and it is defined under which of the following conditions?
  •  From 14.5℃ to 15.5℃ at 760 mm of Hg
  •  From 98.5℃ to 99.5℃ at 760 mm of Hg
  •  From 13.5℃ to 14.5℃ at 76 mm of Hg
  •  From 3.5℃ to 4.5℃ at 76 mm of Hg
1 calorie is the heat required to raise the temperature of 1 g of water from 14.5℃ to 15.5℃ at 760 mm of Hg

Q4. The thermal capacity of a body is 80 cal, then its water equivalent is
  •  80 cal/g
  •  8 g
  •  80 g
  •  80 kg
We know that thermal capacity of a body expressed in calories is equal to water equivalent of the body expressed in grams

Q5.  Recently, the phenomenon of superconductivity has been observed at 95 K. This temperature is nearly equal to.
  •  -288o F
  •  -146o F
  •  -368o F
  •  +178o F
 (F-32)/9=(K-273)/5⇒(F-32)/9=(95-273)/5⇒F=-288o F

Q6. Assuming the sun to be a spherical body of radius Rat a temperature of TK, evaluate the total radiant power, incident on earth, at a distance r from the sun Where r0 is the radius of the earth and σ is stefan’s constant.v
  •  (4πr02 R2 σT4)⁄r2
  •  (πr02 R2 σT4)⁄r2
  • (r02 R2 σT4)⁄(4πr2 )
  •  (R2 σT4)⁄r2
From Stefan’s law, the rate at which energy is radiated by sun at its surface is P=σ×4πr2 T4

[Sun is a perfectly black body as it emits radiations of all wavelengths and so for it e=1.] The intensity of this power at earth’s surface(under the assumption r>>r0) is I=P/(4πR2 )=(σ×4πr2 T4)/(4πR2 )=(σR2 σT4)/r2 The area of earth which receives this energy is only one-half of total surface area of earth, whose projection would be πr02. ∴ Total radiant power as received by earth = πr02×I = (πr02×σR2 T4)/r2 =(πr02 R2 σT4)/r2

Q7. The portion AB of the indicator diagram representing the state of matter denotes

  •  The liquid state of matter
  •  Gaseous state of matter
  •  Change from liquid to gaseous state
  •  Change from gaseous state to liquid state
The volume of matter in portion AB of the curve is almost constant and pressure is decreasing. These are the characteristics of liquid state

Q8. The ends of two rods of different materials with their thermal conductivities, radii of cross-sections and lengths all are in the ratio 1:2 are maintained at the same temperature difference. If the rate of flow of heat in the larger rod is 4 cal/s, that in the shorter rod in cal/s will be
  •  1
  •  2
  •  8
  •  16
dQ/dt=K(πr2 )dθ/dt⇒(dQ/dt)s/(dQ/dt)l =(Ks×rs2×l1)/(Kl×r12×ls )=1/2×1/4×2/1 ⇒(dQ/dt)s=(dQ/dt)l/4=4/4=1

Q9. A hot body will radiate heat most rapidly if its surface is
  •  White & polished
  •  White & rough
  •  Black & polished
  •  Black & rough
Black and rough surfaces are good absorber that’s why they emit well. (Kirchhoff’s law)

Q10. It is hotter for the same distance over the top of a fire than it is in the side of it, mainly because:
  •  Air conducts heat upwards
  •  Heat is radiated upwards
  •  Convection takes more heat upwards
  • Convection, conduction and radiation all contribute significantly transferring heat upwards
Convection significantly transfer heat upwards (Gravity effect)

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 15
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