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Federal (FBISE) · Chapter test · Free

10th Class Physics Chapter 12 Test21. Nuclear Physics

30 marks · 40 minutes · 21 questions. Covers: 21. Nuclear Physics.

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10th Class Physics Chapter 12 Test

10th Class · Physics · Federal (FBISE)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. The natural emission of radiations from unstable nuclei is called:
    1. Fusion
    2. Fission
    3. Radioactivity
    4. Ionization
  2. Which radioactive element is commonly used in smoke alarms?
    1. Uranium-235
    2. Cobalt-60
    3. Americium-241
    4. Iodine-131
  3. Maximum dose limit for radiation workers in emergency situations is:
    1. 1 mSv
    2. 20 mSv
    3. 50 mSv
    4. 100 mSv
  4. Beta particles are:
    1. Protons
    2. Electrons
    3. Gamma rays
    4. Neutrons
  5. Which radiation has the highest ionization ability?
    1. Alpha rays
    2. Beta rays
    3. Gamma rays
    4. Neutrons
  6. Which scientist discovered the neutron?
    1. J.J. Thomson
    2. Rutherford
    3. Chadwick
    4. Bohr
  7. Which equation represents the relation between mass defect and energy released?
    1. F=ma
    2. V=IR
    3. E=mc2
    4. pV=nRT
  8. The method used to separate isotopes is:
    1. Filtration
    2. Distillation
    3. Mass spectrometry
    4. Chromatography
  9. The half-life of Carbon-14 is:
    1. 8 days
    2. 5730 years
    3. 24,000 years
    4. 4.5 billion years
  10. Falsifiability means a theory is scientific only if it can: Falsifiability means a theory is scientific only if it can:
    1. Be believed by many
    2. Be proven correct only
    3. Be tested and possibly proven wrong
    4. Be consistent with tradition

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. How does a smoke alarm detect fire particles?
  2. Explain the plum pudding model of the atom.
  3. A radioactive substance has a half-life of 16 months. In how much time, one-eighth of the substance will be left?
  4. How much energy is released in the fusion of four protons into helium?
  5. Three-fourth of the initial mass of a certain radioactive isotope decays after one hour. Find half-life of isotope in minutes?
  6. How does the presence of dark matter signigicantly contribute to our understanding of the universe's structure and evolution?
  7. mericium ²⁴¹₉₅​Am undergoes alpha decay and produces an alpha particle. Write down the chemical equation for it and name the nucleus formed.
  8. How is 1 Curie related to Becquerel?

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Explain alpha decay in detail with example and mathematical expression.
  2. The C-14 content with a half-life of 5730 years of an ancient piece of wood was found to have three-tenths of that in living trees (indicating 70% of the C-14 had decayed). How old is that piece of wood?
  3. Explain the sources of natural background radiation with examples.