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Atomic and Nuclear Physics Physics - Atomic and Nuclear Physics

Uttarakhand Board (UBSE) - STD 12 Science - Physics (Uttarakhand - English Medium). 589 questions in this chapter.

Question types

Atomic and Nuclear Physics question types

589 questions across 1 question group — pick any mix to generate a Physics paper with step-by-step answer keys.

589
Questions
1
Question groups
5
Question types
Sample Questions

Atomic and Nuclear Physics questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
Assertion : For the scattering of a-particles at a large angles, only the nucleus of the atom is responsible.
Reason : Nucleus is very heavy in comparison to electrons.
  • ✓
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • C
    If assertion is true but reason is false.
  • D
    If the assertion and reason both are false.

Answer: A.

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Q 2M.C.Q (1 Marks)1 Mark
Assertion : Electron capture occurs more often than positron emission in heavy elements.
Reason : Heavy elements exhibit radioactivity.
  • A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • ✓
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • C
    If assertion is true but reason is false.
  • D
    If the assertion and reason both are false.

Answer: B.

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Q 3M.C.Q (1 Marks)1 Mark
Assertion : Fragments produced in the fission of $\mathrm{U}^{235}$ are radioactive.
Reason : The fragments have abnormally high proton to neutron ratio.
  • A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • ✓
    If assertion is true but reason is false.
  • D
    If the assertion and reason both are false.

Answer: C.

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Q 4M.C.Q (1 Marks)1 Mark
Assertion : Radioactivity of $10^8$ undecayed radioactive nuclei of half life of 50 days is equal to that of $1.2 \times 10^8$ number of undecayed nuclei of some other material with half life of 60 days
Reason : Radioactivity is proportional to half-life.
  • A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • ✓
    If assertion is true but reason is false.
  • D
    If the assertion and reason both are false.

Answer: C.

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Q 5M.C.Q (1 Marks)1 Mark
Assertion : The mass of b-particles when they are emitted is higher than the mass of electrons obtained by other means.
Reason : b-particle and electron, both are similar particles.
  • A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • ✓
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • C
    If assertion is true but reason is false.
  • D
    If the assertion and reason both are false.

Answer: B.

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