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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 26 July 2022, Shift 2, Physics Q41

Question 41 of 90 in this shift, Physics question 11 of 30, Section A.

An ice cube of dimensions 60 cm ×\times 50 cm ×\times 20 cm is placed in an insulation box of wall thickness 1 cm. The box keeping the ice cube at 0∘0^\circC of temperature is brought to a room of temperature 40∘40^\circC. 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}\ \text{J kg}^{-1} and thermal conducting of insulation wall is 0.05 Wm−1∘C−10.05\ \text{Wm}^{-1}{}^\circ\text{C}^{-1})
  1. (1)61×10−3 kg s−161 \times 10^{-3}\ \text{kg s}^{-1}
  2. (2)61×10−5 kg s−161 \times 10^{-5}\ \text{kg s}^{-1}Official answer
  3. (3)208 kg s−1208\ \text{kg s}^{-1}
  4. (4)30×10−5 kg s−130 \times 10^{-5}\ \text{kg s}^{-1}

Official answer

Option 2

NTA final key.

Chapter
Thermal Properties of Matter
Topic
Heat Conduction
Idea tested
Fourier's Law of Conduction

Same topic in other shifts

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.