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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 24 June 2022, Shift 2, Physics Q44

Question 44 of 90 in this shift, Physics question 14 of 30, Section A.

A 100 g of iron nail is hit by a 1.5 kg hammer striking at a velocity of 60 ms−1ms^{-1}. What will be the rise in the temperature of the nail if one fourth of energy of the hammer goes into heating the nail ? [Specific heat capacity of iron = 0.42 Jg−1 ∘C−1Jg^{-1}\,{}^{\circ}C^{-1}]
  1. (1)675∘C675^{\circ}C
  2. (2)1600∘C1600^{\circ}C
  3. (3)16.07∘C16.07^{\circ}COfficial answer
  4. (4)6.75∘C6.75^{\circ}C

Official answer

Option 3

NTA final key.

Chapter
Thermal Properties of Matter
Topic
Calorimetry
Idea tested
Mechanical Equivalent of Heat

Same idea in other shifts

Asked 3× in all
  1. 8 Apr 2025, Shift 2 · Q32Water falls from a height of 200 m into a pool. Calculate the rise in temperature of the water assuming no heat dissipation from the water…EasySingle correct
  2. 5 Sep 2020, Shift 1 · Q6A bullet of mass 5 g, travelling with a speed of 210 m/s, strikes a fixed wooden target. One half of its kinetic energy is converted into…MediumSingle correct

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.