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Bihar Board Class 12 (Science) Atoms and Nuclei — practice questions — page 2

Explore 78 free Atoms and Nuclei questions in Bihar Board Class 12 (Science) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Atoms and Nuclei questions and exercises with answers

Showing questions 31–60 of 78.

Two are true, one is notRead the answer and worked solution →Assertion and reason: modelsRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Flip and pair: problem with the model that solved itRead the answer and worked solution →Which iso- term is itRead the answer and worked solution →Order the three decaysRead the answer and worked solution →Judge the assertion and the reasonRead the answer and worked solution →Type the nuclear numbersRead the answer and worked solution →Spot the false statementRead the answer and worked solution →Complete the size of the nucleusRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →The minimum wavelength $\lambda_{\min}$ in the continuous X-ray spectrum of an X-ray tube depends only onRead the answer and worked solution →Flip and pair: problem with the model that solved itRead the answer and worked solution →Which model does this belong to?Read the answer and worked solution →Bohr's postulatesRead the answer and worked solution →True or false: the nucleusRead the answer and worked solution →Charge and neutralityRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Tap every problem Bohr's model was built to solveRead the answer and worked solution →Flip and pair: model with its pictureRead the answer and worked solution →Strength or weakness?Read the answer and worked solution →Reading the models backRead the answer and worked solution →Assertion and reason: modelsRead the answer and worked solution →True or false: line spectraRead the answer and worked solution →Bohr's postulate quantises the angular momentum of an electron in a stationary orbit asRead the answer and worked solution →Which spectral series of hydrogen lies in the visible region of the electromagnetic spectrum?Read the answer and worked solution →Explained, or left unexplained?Read the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →The ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series of hydrogen isRead the answer and worked solution →

Worked practice questions

Two are true, one is not

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Questions
  1. False statement
    Rutherford's electron is stable
    Statements
    1. An accelerating charge radiates
    2. Rutherford's electron should spiral in
    3. Rutherford's electron is stable
  2. False statement
    Bohr's orbits radiate continuously
    Statements
    1. Bohr's orbits radiate continuously
    2. Bohr's orbits do not radiate
    3. Bohr explained line spectra
  3. False statement
    They are continuous bands
    Statements
    1. Line spectra are isolated lines
    2. They are continuous bands
    3. They carry structural information
The false line reverses a model's outcome. Source: syllabus Physics, Ch 12 Atoms.

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Assertion and reason: models

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Questions
  1. Reason
    Classical physics predicts any orbiting electron must radiate.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Bohr had to postulate stationary orbits rather than derive them.
  2. Reason
    Each element emits its own characteristic set of lines.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Line spectra are useful evidence about atomic structure.
  3. Reason
    An atom as a whole is electrically neutral.
    Verdict
    The assertion is false and the reason is true.
    Assertion
    Thomson's model explains scattering results.
The reason must genuinely explain the assertion. Source: syllabus Physics, Ch 12 Atoms.

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Spot the one that does not belong

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Questions
  1. Items
    1. Stationary orbit
    2. Embedded electron
    3. Three postulates
    Odd item
    Embedded electron
  2. Items
    1. Spiralling electron
    2. Predicted instability
    3. Stable orbit
    Odd item
    Stable orbit
  3. Items
    1. Continuous band
    2. Line spectrum
    3. Isolated lines
    Odd item
    Continuous band
One belongs to a different model. Source: syllabus Physics, Ch 12 Atoms.

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