JEE Main 2024 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 31 January 2024, Shift 1, Physics Q60

Question 60 of 90 in this shift, Physics question 30 of 30, Section B.

The mass defect in a particular reaction is 0.4g. The amount of energy liberated is

n\times10^7

kWh, where

n=

_______. (speed of light =

3 imes10^8

m/s)

Official answer

NTA final key.

Chapter: Nuclei
Topic: Nuclear Binding Energy
Idea tested: Mass Defect Calculation

Same idea in other shifts

Asked 4× in all

5 Apr 2026, Shift 2 · Q44Assuming the experimental mass of ${}^{12}_{6}\mathrm{C}$ as 12 u, the mass defect of ${}^{12}_{6}\mathrm{C}$ atom is ________…EasySingle correct
8 Apr 2024, Shift 1 · Q46Binding energy of a certain nucleus is $18\times10^8$ J. How much is the difference between total mass of all the nucleons and nuclear…EasySingle correct
3 Aug 2021, Shift 2 · Q12If $A$ , $Z$ and $M$ represents the number of nucleons, protons and mass of the nucleus respectively, then mass defect $\Delta M$ is…EasySingle 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 42 of the 174 JEE Main shifts held from 2017 to 2026.