Physical Chemistry (1444 MCQS)

Structure of Atom (Classical Mechanics)(237) Structure of Atom Wave | Mechanical Approach(126) Isotopes, Isobars and Isotones(74) Nuclear Chemistry(220) Chemical Bonding- Lewis Theory(179) Chemical Bonding | Orbital Concept(85) First Law of Thermodynamics - Basic Concepts(100) Thermochemistry (60) Second Law of Thermodynamics (83) mcqs on Gaseous State(115) Liquid State MCQs(70) mcqs on Solid state (95)

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LECTURESHIP, SUBJECT SPECIALIST COURSE's

Chapter No 4 :Nuclear Chemistry (220 MCQ`S)

  1. Which one of the following series consists of elements which do not occur naturally?
    1. thorium series
    2. actinium series
    3. neptunium series
    4. uranium series
      5. Show Answer
      Answer: C
      Explanation:
      • N/A
  2. The neptunium series starts with Np-237 and terminates at:
    1. lead-207
    2. Bismuth-200
    3. lead-210
    4. Bismuth-210
      5. Show Answer
      Answer: B
      Explanation:
      • N/A
  3. The rate of radioactive decay depends on:
    1. the number of isotopes
    2. the number of atoms present
    3. external conditions
    4. all of these
      5. Show Answer
      Answer: B
      Explanation:
      • N/A
  4. If N is the number of undecayed atoms of an isotope present in the sample at any time t, the rate of radioactive decay is given by the equation:
    1. `-(dN)/dt = lamdaN`
    2. `(dN)/dt = lamdaN`
    3. `-(dN)/dt = lamda/N`
    4. `-(dN)/dt = N/lamda`
      5. Show Answer
      Answer: A
      Explanation:
      • In the equation `-(dN)/dt = lamda N` , λ is called decay constant or disintegration constant.
  5. The proportion of atoms of an isotope decaying per second is called:
    1. disintegration constant
    2. rate of radioactive decay
    3. Disintegration law
    4. none of these
      5. Show Answer
      Answer: A
      Explanation:
      • Decay constant or disintegration constant (λ) = `-(dN)/dtN` = `-(dN)/N` (dt =1)

  6. The S.I unit of radioactivity (or rate of disintegration) is:

    1. Becquerel (Bq)

    2. disintegration (or decay) per second (dps)

    3. Curie (Ci)

    4. all of these

      5. Show Answer
      Answer: A
      Explanation:

      • 1. There are sources according to which becquerel is international unit of radioactivity.

        2. Curi is Non S.I unit of radioactivity

  7. The S.I unit of radioactivity (or rate of disintegration) is:
    1. Becquerel (Bq)
    2. Rutherford
    3. Curie (Ci)
    4. none of these
      5. Show Answer
      Answer: A
      Explanation:
      • N/A
  8. A curie is a quantity of a radioactive material decaying at the same rate as one gram of:
    1. uranium-235
    2. radium-226
    3. thorium-230
    4. polonium-214
      5. Show Answer
      Answer: B
      Explanation:
      • N/A
  9. 1 Becquerel (Bq) is equivalent to:
    1. 1 dps
    2. 10 dps
    3. 3.7 x 1010 dps
    4. 106 dps
      5. Show Answer
      Answer: A
      Explanation:
      • N/A
  10. 1 Rutherford = --------
    1. 10 dps
    2. 3.7 x 1010 dps
    3. 106 dps
    4. 37 GBq
      5. Show Answer
      Answer: C
      Explanation:
      • N/A

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