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Heat and Thermodynamics question

2022 · 26 Jul · Shift 2 · Q49
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  5. /2022 · 26 Jul · Shift 2 · Q49

Heat and Thermodynamics question

2022 · 26 Jul · Shift 2 · Q49

JEE MainPhysicsHeat and ThermodynamicsMCQ+4 / −1
An ice cube of dimensions 60 cm×50 cm×20 cm60 \mathrm{~cm} \times 50 \mathrm{~cm} \times 20 \mathrm{~cm}60 cm×50 cm×20 cm is placed in an insulation box of wall thickness 1 cm1 \mathrm{~cm}1 cm. The box keeping the ice cube at 0∘C0^{\circ} \mathrm{C}0∘C of temperature is brought to a room of temperature 40∘C40^{\circ} \mathrm{C}40∘C. The rate of melting of ice is approximately : (Latent heat of fusion of ice is 3.4×105 J kg−13.4 \times 10^{5} \mathrm{~J} \mathrm{~kg}^{-1}3.4×105 J kg−1 and thermal conducting of insulation wall is 0.05 Wm−1∘C−10.05 \,\mathrm{Wm}^{-1 \circ} \mathrm{C}^{-1}0.05Wm−1∘C−1 )
  1. A
    61×10−3 kg s−161 \times 10^{-3} \mathrm{~kg} \mathrm{~s}^{-1}61×10−3 kg s−1
  2. B
    61×10−5 kg s−161 \times 10^{-5} \mathrm{~kg} \mathrm{~s}^{-1}61×10−5 kg s−1
  3. C
    208 kg s−1208 \mathrm{~kg} \mathrm{~s}^{-1}208 kg s−1
  4. D
    30×10−5 kg s−130 \times 10^{-5} \mathrm{~kg} \mathrm{~s}^{-1}30×10−5 kg s−1
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