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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 27 June 2022, Shift 2, Physics Q39

Question 39 of 90 in this shift, Physics question 9 of 30, Section A.

A lead bullet penetrates into a solid object and melts. Assuming that 40% of its kinetic energy is used to heat it, the initial speed of bullet is : (Given, initial temperature of the bullet = 127°C, Melting point of the bullet = 327°C, Latent heat of fusion of lead = 2.5×1042.5 \times 10^{4} J kg−1^{-1}, Specific heat capacity of lead = 125 J/kg K)
  1. (1)125 ms−1^{-1}
  2. (2)500 ms−1^{-1}Official answer
  3. (3)250 ms−1^{-1}
  4. (4)600 ms−1^{-1}

Official answer

Option 2

NTA final key.

Chapter
Thermal Properties of Matter
Topic
Calorimetry
Idea tested
Bullet Impact Melting

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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.