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    Exercise-I::: Answer Key

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    Rishabh
    This document contains the answers to multiple choice and numerical exercises on the topic of heat. It is divided into 5 sections with varying types of questions on concepts such as specific heat, heat transfer, thermal conductivity, and thermodynamics. The answers provided are either single letters, numbers, or short phrases corresponding to the questions.

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    Exercise-I::: Answer Key

    Uploaded by

    Rishabh
    24 views2 pages
    This document contains the answers to multiple choice and numerical exercises on the topic of heat. It is divided into 5 sections with varying types of questions on concepts such as specific heat, heat transfer, thermal conductivity, and thermodynamics. The answers provided are either single letters, numbers, or short phrases corresponding to the questions.

    Original Description:

    Heat 1

    Original Title

    Answer Key

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    This document contains the answers to multiple choice and numerical exercises on the topic of heat. It is divided into 5 sections with varying types of questions on concepts such as specific heat, heat transfer, thermal conductivity, and thermodynamics. The answers provided are either single letters, numbers, or short phrases corresponding to the questions.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    24 views2 pages

    Exercise-I::: Answer Key

    Uploaded by

    Rishabh
    This document contains the answers to multiple choice and numerical exercises on the topic of heat. It is divided into 5 sections with varying types of questions on concepts such as specific heat, heat transfer, thermal conductivity, and thermodynamics. The answers provided are either single letters, numbers, or short phrases corresponding to the questions.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    of 2

    Page # 38 HEAT

    :: ANSWER KEY ::
    Exercise-I

    1. D 2. A 3. C 4. B 5. A 6. D
    7. A 8. B 9. C 10. D 11. C 12. A
    13. B 14. (a) A (b) D 15. B 16. B 17. A 18. C
    19. C 20. A 21. C 22. B 23. A 24. D
    25. A 26. B 27. C 28. B 29. C 30. C
    31. A 32. A 33. A 34. A 35. B 36. B
    37. A 38. C 39. A 40. A 41. B 42. A
    43. D 44. B 45. D 46. B 47. A 48. C
    49. B 50. D 51. B 52. B 53. B 54. A
    55. A 56. C

    Exercise-II

    1. CD 2. ABC 3. ABD 4. AB 5. ABCD 6. CD


    7. D 8. D 9. A,C 10. A,B 11. D 12. A,B
    13. A,B,CD 14. B

    Exercise-III
    315
    1. H = 590 Kcal.2. 136 km 3. 8.6 103 C 4. = C = 28.66C
    1050 11
    5. LB > LA = LC 6. SA = SB > SC > SD 7. sec. = 7.7 min
    2.27
    8. 25.5C 9. 4C 10. 27/85

    11. 0C, 125/4 g ice, 1275/4 g water 12. (i) 0.02 kg, (ii) 40,000 cal kg1, (iii) 750 cal kg1 K1

    13. 64 J 14. 5 105 g/s 15. 4.0 W 16. 2 :


    17. 10 cm from end in contact with water at
    t1 t 2 t 3
    t 1 t t
    18. 2 3 19. 65C 20. 5C 21. 4/3
    k1 k 2 k 3
    Kr1r2 ( 2 1 )
    22. 15 W/mC 23.
    L
    24. 12 C/s 25. 1800 J 26. 10 sec 27. ( 6 / )1/ 3 28. 2 : 1 29. 3025 K 30. 80 Watt.
    31. 1700 K 32. 0.3 33. 15C
    34. 6 103 K ; 4 103 K 35. 7.31 1010 erg/cm2 sec. 36. m = 3 m

    37. 7 minutes. 38. 34C

    394,50 - Rajeev Gandhi Nagar Kota, Ph. No. : 93141-87482, 0744-2209671


    IVRS No : 0744-2439051, 52, 53, www. motioniitjee.com, info@motioniitjee.com
    HEAT Page # 39

    Exercise-IV
    1. 1 : 1.26 2. 800 cal kg1 K1, 1000 cal kg1 K1 3. (a) 37.8 J/s (Watts), (b) 2.005 N-m

    K A KB 2K AK B
    4. 5000 J/C kg 5. 45C 6. K11 > K , K|| = , K = K K
    2 A B

    a2 s b T0 T1 l1 k( T1 Tm )
    7. 2K loge a loge T T 8.
    l k( T1 Tm ) ( Tm T2 ) 9. (a) 100C/m, (b) 1000 J
    0 2

    10. 166.3 sec 11. 9.72C/min 12. TA = 423K 13. T = 4


    2 500 = 600 K
    14. 10 minutes 15. (i) 74 cm, (ii) 73.94 cm, (iii) 69.52 cm

    16. (i) p1 = pH2 ~ 1.25 106 Pa ; p2 = pH2 + pO2 + pN2 ~ 2.8125 106 Pa ; p3 = pH2 + pN2 ~ 1.5625 106 Pa

    17. 60C

    Exercise-V

    1. 12 gm 2. 60C 3. 41.53 Watt; 26.48 C ; 0.55 C 4. D 5. 5.5 min

    loge 2 KA loge 2
    6. k = ; T = 300 + 50 exp. 2t1 7. D 8. A
    t1 LC t1

    9. B 10. B 11. D 12. 0.5 kg 13. A 14. A


    15. (a) 595 watt/m2, (b) T0 420K 16. B 17. D 18. C

    K
    19. l = 2s 20. 21. A 22. C 23. A 24. A 25. B 26. A,D 27. 273K
    4eLTS3 K

    28. (A) S, Q ; (B) Q ; (C) P, Q ; (D) Q, R or (A) S, (B) Q, (C) P, (D) R 29. 9 30. 8 g
    31. C

    394,50 - Rajeev Gandhi Nagar Kota, Ph. No. : 93141-87482, 0744-2209671


    IVRS No : 0744-2439051, 52, 53, www. motioniitjee.com, info@motioniitjee.com

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