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Heat and Thermodynamics question

2025 · 22 Jan · Shift 1 · Q58
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  5. /2025 · 22 Jan · Shift 1 · Q58

Heat and Thermodynamics question

2025 · 22 Jan · Shift 1 · Q58

JEE MainPhysicsHeat and ThermodynamicsMCQ+4 / −1
An amount of ice of mass 10−3 kg10^{-3} \mathrm{~kg}10−3 kg and temperature −10∘C-10^{\circ} \mathrm{C}−10∘C is transformed to vapour of temperature 110∘C110^{\circ} \mathrm{C}110∘C by applying heat. The total amount of work required for this conversion is, (Take, specific heat of ice =2100Jkg−1 K−1=2100 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1}=2100Jkg−1 K−1, specific heat of water =4180Jkg−1 K−1=4180 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1}=4180Jkg−1 K−1, specific heat of steam =1920Jkg−1 K−1=1920 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1}=1920Jkg−1 K−1, Latent heat of ice =3.35×105Jkg−1=3.35 \times 10^5 \mathrm{Jkg}^{-1}=3.35×105Jkg−1 and Latent heat of steam =2.25×106Jkg−1=2.25 \times 10^6\mathrm{Jkg}^{-1}=2.25×106Jkg−1 )
  1. A
    3022 J
  2. B
    3043 J
  3. C
    3003 J
  4. D
    3024 J
View written solutionFree

Correct answer: B

  1. Heat required to convert ice at −10∘C-10^\circ\text{C}−10∘C to steam at 110∘C110^\circ\text{C}110∘C

We add heat in five stages:

  • heat ice from −10∘C-10^\circ\text{C}−10∘C to 0∘C0^\circ\text{C}0∘C
  • melt ice at 0∘C0^\circ\text{C}0∘C
  • heat water from 0∘C0^\circ\text{C}0∘C to 100∘C100^\circ\text{C}100∘C
  • convert water at 100∘C100^\circ\text{C}100∘C to steam
  • heat steam from 100∘C100^\circ\text{C}100∘C to 110∘C110^\circ\text{C}110∘C

Given:

m=10−3 kgm=10^{-3}\,\text{kg}m=10−3kg cice=2100 J kg−1K−1c_{\text{ice}}=2100\,\text{J kg}^{-1}\text{K}^{-1}cice​=2100J kg−1K−1 cwater=4180 J kg−1K−1c_{\text{water}}=4180\,\text{J kg}^{-1}\text{K}^{-1}cwater​=4180J kg−1K−1 csteam=1920 J kg−1K−1c_{\text{steam}}=1920\,\text{J kg}^{-1}\text{K}^{-1}csteam​=1920J kg−1K−1 Lf=3.35×105 J kg−1L_f=3.35\times 10^5\,\text{J kg}^{-1}Lf​=3.35×105J kg−1 Lv=2.25×106 J kg−1L_v=2.25\times 10^6\,\text{J kg}^{-1}Lv​=2.25×106J kg−1


  1. Stage 1: Heating ice from −10∘C-10^\circ\text{C}−10∘C to 0∘C0^\circ\text{C}0∘C

Q1=mciceΔTQ_1=mc_{\text{ice}}\Delta TQ1​=mcice​ΔT Q1=(10−3)(2100)(10)=21 JQ_1=(10^{-3})(2100)(10)=21\,\text{J}Q1​=(10−3)(2100)(10)=21J


  1. Stage 2: Melting the ice at 0∘C0^\circ\text{C}0∘C

Q2=mLfQ_2=mL_fQ2​=mLf​ Q2=(10−3)(3.35×105)=335 JQ_2=(10^{-3})(3.35\times 10^5)=335\,\text{J}Q2​=(10−3)(3.35×105)=335J


  1. Stage 3: Heating water from 0∘C0^\circ\text{C}0∘C to 100∘C100^\circ\text{C}100∘C

Q3=mcwaterΔTQ_3=mc_{\text{water}}\Delta TQ3​=mcwater​ΔT Q3=(10−3)(4180)(100)=418 JQ_3=(10^{-3})(4180)(100)=418\,\text{J}Q3​=(10−3)(4180)(100)=418J


  1. Stage 4: Converting water at 100∘C100^\circ\text{C}100∘C to steam

Q4=mLvQ_4=mL_vQ4​=mLv​ Q4=(10−3)(2.25×106)=2250 JQ_4=(10^{-3})(2.25\times 10^6)=2250\,\text{J}Q4​=(10−3)(2.25×106)=2250J


  1. Stage 5: Heating steam from 100∘C100^\circ\text{C}100∘C to 110∘C110^\circ\text{C}110∘C

Q5=mcsteamΔTQ_5=mc_{\text{steam}}\Delta TQ5​=mcsteam​ΔT Q5=(10−3)(1920)(10)=19.2 JQ_5=(10^{-3})(1920)(10)=19.2\,\text{J}Q5​=(10−3)(1920)(10)=19.2J


  1. Total heat required

Q=Q1+Q2+Q3+Q4+Q5Q=Q_1+Q_2+Q_3+Q_4+Q_5Q=Q1​+Q2​+Q3​+Q4​+Q5​ Q=21+335+418+2250+19.2Q=21+335+418+2250+19.2Q=21+335+418+2250+19.2 Q=3043.2 JQ=3043.2\,\text{J}Q=3043.2J

So, approximately,

Q≈3043 JQ\approx 3043\,\text{J}Q≈3043J


  1. Matching with options
  • A: 3022 J3022\,\text{J}3022J
  • B: 3043 J3043\,\text{J}3043J
  • C: 3003 J3003\,\text{J}3003J
  • D: 3024 J3024\,\text{J}3024J

Therefore, the correct option is B.

Note: The question says "work required," but in this thermodynamics context it clearly means the heat energy required for the full conversion.

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