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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper I covers general studies.

UPSC Combined Geo-Scientist, Prelims · 2025 · Paper I, General Studies · Q8 of 120

Geo-Scientist Prelims 2025 General Studies Q8: The masses of ^42He, ^31H and ^11H nuclides are respectively…

QuestionNuclear physics / binding energy

The masses of \(^{4}_{2}\)He, \(^{3}_{1}\)H and \(^{1}_{1}\)H nuclides are respectively 4·002603 amu, 3·016056 amu and 1·007276 amu. How much energy should a γ-ray photon possess if it is to split an α-particle into a tritium (\(^{3}_{1}\)H) and a proton (\(^{1}_{1}\)H)? (Given that 1 amu of mass is equivalent to 931 MeV)

  1. (a) 19·30 MeV
  2. (b) 0·931 MeV
  3. (c) 0·021 MeV
  4. (d) 0·194 MeV

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