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  • Question

  • The items amenable to detection by soft x-rays are


  • Options
  • A. contrabands
  • B. lead in bullets
  • C. narcotics
  • D. genuine coins from counterfeit coins

  • Correct Answer
  • genuine coins from counterfeit coins 

    • Chemistry problems

    Search Results

    • 1. The ore which is found in abundance in India is

    • Options
    • A. monazite
    • B. fluorspar
    • C. bauxite
    • D. magnetite
      • Discuss
    • 2. The mass number of an atom is equal to

    • Options
    • A. the number of protons
    • B. the number of protons and electrons
    • C. the number of nucleons
    • D. the number of neutrons
      • Discuss
    • 3. The hydronium ion is

    • Options
    • A. H+
    • B. HO -
    • C. H2+
    • D. H3O+
      • Discuss
    • 4. The iron ore magnetite consists of

    • Options
    • A. Fe2O3
    • B. Fe3OH4
    • C. FeCO3
    • D. 3Fe2O3 .. 3H2O
      • Discuss
    • 5. The nuclear particles which are assumed to hold the nucleons together are

    • Options
    • A. electrons
    • B. positrons
    • C. neutrons
    • D. mesons
      • Discuss
    • 6. The material which can be deformed permanently by heat and pressure is called a

    • Options
    • A. thermoplastic
    • B. thermoset
    • C. chemical compound
    • D. polymer
      • Discuss
    • 7. The octane number of zero is assigned to

    • Options
    • A. 2-methyl octane
    • B. n-heptane
    • C. iso-octane
    • D. 3-methyl octane
      • Discuss
    • 8. The method that cannot be used for removing permanent hardness of water is

    • Options
    • A. adding sodium carbonate
    • B. distillation
    • C. adding caustic soda
    • D. boiling
      • Discuss
    • 9. The molecular formula of phosphorous is

    • Options
    • A. P1
    • B. P2
    • C. P3
    • D. P4
      • Discuss
    • 10. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

    • Options
    • A. 5x/36
    • B. 5x
    • C. 7.2 x
    • D. x/6
      • Discuss

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