UPSC Prelims Practice Questions — New crystal found in the detritus of the first-ever nuclear blast

Q1. Ordinary trinitite from the Trinity test is greenish, but a distinct 'red' variety exists. This red tint is attributed to the incorporation of a metal that melted from the test tower's wiring. How many such metallic elements are principally responsible for the red colouration of red trinitite?

  • A. One
  • B. Two
  • C. Three
  • D. Four

Q2. With reference to trinitite, consider the following: 1. It is a glassy substance formed when the heat of the Trinity blast fused the surrounding desert sand. 2. Its 'red' variety is coloured by copper melted from the test tower's wiring. 3. It is also historically known as 'atomsite' or 'Alamogordo glass'. 4. It was produced at the Trinity site located in the U.S. state of Nevada. Which of the above are correctly identified?

  1. It is a glassy substance formed when the heat of the Trinity blast fused the surrounding desert sand.
  2. Its 'red' variety is coloured by copper melted from the test tower's wiring.
  3. It is also historically known as 'atomsite' or 'Alamogordo glass'.
  4. It was produced at the Trinity site located in the U.S. state of Nevada.
  • A. 1 and 2 only
  • B. 2, 3 and 4
  • C. 1, 2 and 3
  • D. 1, 3 and 4

Q3. The Trinity test — the first-ever nuclear explosion — released an energy roughly equivalent to how many tons of TNT?

  • A. About 2,100 tons
  • B. About 21,000 tons
  • C. About 210,000 tons
  • D. About 2,000,000 tons

Q4. Consider the following statements comparing the Trinity test device with the weapons used later in 1945: 1. The Trinity device was a plutonium implosion-type bomb, of the same basic design family as the 'Fat Man' later dropped on Nagasaki. 2. The Trinity test was conducted before the atomic bombings of Hiroshima and Nagasaki. 3. The Trinity device was code-named 'Little Boy'. Which of the statements given above is/are correct?

  1. The Trinity device was a plutonium implosion-type bomb, of the same basic design family as the 'Fat Man' later dropped on Nagasaki.
  2. The Trinity test was conducted before the atomic bombings of Hiroshima and Nagasaki.
  3. The Trinity device was code-named 'Little Boy'.
  • A. 1 only
  • B. 1 and 2 only
  • C. 2 and 3 only
  • D. 1, 2 and 3

Q5. In materials science, a 'clathrate' is best described as:

  • A. A crystalline compound in which a host framework of cages encloses guest atoms or molecules
  • B. A solid whose atoms are ordered and symmetric but arranged in a non-repeating (aperiodic) pattern
  • C. A crystal built from two or more interpenetrating identical lattices sharing no atoms
  • D. A mineral that can form only through the slow cooling of molten magma

Q6. The Ca–Cu–Si clathrate reported in trinitite in 2026 is scientifically significant primarily because it is described as the FIRST of its kind. Which of the following correctly captures this 'first'?

  • A. The first crystallographically confirmed clathrate documented among the solid-state products of any nuclear detonation
  • B. The first clathrate compound ever synthesized in a laboratory
  • C. The first naturally occurring clathrate hydrate discovered on Earth
  • D. The first quasicrystal ever identified within trinitite

Q7. Consider the following statements about the two exotic structures found in trinitite (a quasicrystal reported in 2021 and a clathrate reported in 2026): 1. Both were recovered from the copper-bearing 'red' variety of trinitite. 2. The quasicrystal has an ordered but non-repeating (aperiodic) atomic arrangement, whereas the clathrate is a periodic cage structure. 3. The quasicrystal was the first such structure ever found in nature, and clathrates too had never before been observed in any natural setting. Which of the statements given above is/are correct?

  1. Both were recovered from the copper-bearing 'red' variety of trinitite.
  2. The quasicrystal has an ordered but non-repeating (aperiodic) atomic arrangement, whereas the clathrate is a periodic cage structure.
  3. The quasicrystal was the first such structure ever found in nature, and clathrates too had never before been observed in any natural setting.
  • A. 1 and 2 only
  • B. 1 and 3 only
  • C. 2 and 3 only
  • D. 1, 2 and 3

Q8. In the context of the trinitite discoveries, a 'quasicrystal' is a solid whose atomic structure is:

  • A. Ordered and symmetric, yet lacks the regular periodic repetition characteristic of ordinary crystals
  • B. A cage-like framework that encloses guest atoms within its voids
  • C. Completely disordered, with no long-range order, like an ordinary glass
  • D. Built entirely from a single repeating unit cell, exactly as in all conventional crystals

Q9. The 2026 study reporting the Ca–Cu–Si clathrate synthesized during the Trinity test was published in which one of the following journals?

  • A. Proceedings of the National Academy of Sciences (PNAS)
  • B. Nature
  • C. Science
  • D. Physical Review Letters

Q10. The 2026 PNAS clathrate study was led by the same principal scientists who had earlier led the 2021 quasicrystal discovery in the same red trinitite. How many such principal researchers jointly led this work?

  • A. One
  • B. Two
  • C. Three
  • D. Four

Q11. The trinitite whose extreme non-equilibrium conditions produced these exotic crystals was created by the first nuclear test, conducted under the Manhattan Project. Which body actually administered and operationalised the Manhattan Project?

  • A. The U.S. Army Corps of Engineers (the Manhattan Engineer District)
  • B. The U.S. Atomic Energy Commission
  • C. The U.S. Department of Energy
  • D. The National Aeronautics and Space Administration (NASA)