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Atoms and Nuclei

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Rutherford and Bohr’s Atomic Models

Subtopic

Rutherford and Bohr’s Atomic Models under Atoms and Nuclei for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which spectral series of the hydrogen atom lies in the visible region of the electromagnetic spectrum?

    A.

    Balmer series

    B.

    Lyman series

    C.

    Paschen series

    D.

    Pfund series

  2. 2.

    According to the Bohr model of the hydrogen atom, the radius of the stationary orbit (rnr_n) depends on the principal quantum number nn as:

    A.

    rn∝nr_n \propto n

    B.

    rn∝1nr_n \propto \frac{1}{n}

    C.

    rn∝1n2r_n \propto \frac{1}{n^2}

    D.

    rn∝n2r_n \propto n^2

  3. 3.

    Bohr's second postulate states that the angular momentum (LL) of an electron revolving around the nucleus in a stationary orbit is quantized as:

    A.

    L=h2πL = \frac{h}{2\pi}

    B.

    L=n2h2πL = n^2\frac{h}{2\pi}

    C.

    L=nh2πL = n\frac{h}{2\pi}

    D.

    L=nhπL = \frac{nh}{\pi}

Download the worksheet for Atoms and Nuclei - Rutherford and Bohr’s Atomic Models to practice offline. It includes additional chapter-level practice questions.

X-Rays

Subtopic

X-Rays under Atoms and Nuclei for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The intensity of X-rays produced in an X-ray tube depends on the:

    A.

    Atomic number of the target

    B.

    Filament current

    C.

    Accelerating voltage

    D.

    Nature of the target material

  2. 2.

    X-rays are not deflected by electric or magnetic fields because they:

    A.

    Travel with the speed of light

    B.

    Are highly penetrating

    C.

    Are neutrally charged electromagnetic waves

    D.

    Have a very short wavelength

  3. 3.

    In a Coolidge tube, the process of emitting electrons from the filament is known as:

    A.

    Secondary emission

    B.

    Thermionic emission

    C.

    Photoelectric emission

    D.

    Field emission

Download the worksheet for Atoms and Nuclei - X-Rays to practice offline. It includes additional chapter-level practice questions.

Composition and Size of Nucleus

Subtopic

Composition and Size of Nucleus under Atoms and Nuclei for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following statements regarding the density of nuclear matter is true?

    A.

    It is nearly constant for all nuclei and independent of mass number AA.

    B.

    It is directly proportional to the mass number AA.

    C.

    It decreases as the mass number AA increases.

    D.

    It is proportional to the cube root of the mass number AA.

  2. 2.

    Two nuclei have mass numbers in the ratio 1:81:8. What is the ratio of their nuclear radii?

    A.

    1:41:4

    B.

    1:81:8

    C.

    1:11:1

    D.

    1:21:2

  3. 3.

    The radius of a nucleus RR is related to its mass number AA by the relation R=R0A1/3R = R_0 A^{1/3}. What is the approximate value of the constant R0R_0?

    A.

    1.2×10−15 m1.2 \times 10^{-15} \text{ m}

    B.

    1.2×10−10 m1.2 \times 10^{-10} \text{ m}

    C.

    1.2×10−12 m1.2 \times 10^{-12} \text{ m}

    D.

    1.2×10−9 m1.2 \times 10^{-9} \text{ m}

Download the worksheet for Atoms and Nuclei - Composition and Size of Nucleus to practice offline. It includes additional chapter-level practice questions.

Mass-Energy Relation and Binding Energy

Subtopic

Mass-Energy Relation and Binding Energy under Atoms and Nuclei for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    If a certain amount of matter is converted into energy, and the resulting energy is 9×1013 J9 \times 10^{13} \text{ J}, what was the mass of the matter? (Take c=3×108 m/sc = 3 \times 10^8 \text{ m/s})

    A.

    10 kg10 \text{ kg}

    B.

    1 g1 \text{ g}

    C.

    0.1 g0.1 \text{ g}

    D.

    1 mg1 \text{ mg}

  2. 2.

    The stability of a nucleus is primarily determined by which of the following quantities?

    A.

    Total mass of the nucleus

    B.

    Total binding energy

    C.

    Binding energy per nucleon

    D.

    Number of protons in the nucleus

  3. 3.

    According to Einstein's mass-energy equivalence relation, the energy equivalent of 1 amu1 \text{ amu} (atomic mass unit) is approximately:

    A.

    93.15 MeV93.15 \text{ MeV}

    B.

    931.5 MeV931.5 \text{ MeV}

    C.

    1.6×10−19 J1.6 \times 10^{-19} \text{ J}

    D.

    3×108 J3 \times 10^8 \text{ J}

Download the worksheet for Atoms and Nuclei - Mass-Energy Relation and Binding Energy to practice offline. It includes additional chapter-level practice questions.

Radioactivity

Subtopic

Radioactivity under Atoms and Nuclei for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Gamma (γ\gamma) rays are physically identical to which of the following?

    A.

    High-speed electrons

    B.

    Helium nuclei

    C.

    Electromagnetic waves of very short wavelength

    D.

    Positively charged protons

  2. 2.

    When a radioactive nucleus emits an alpha (α\alpha) particle, how do its atomic number (ZZ) and mass number (AA) change?

    A.

    ZZ decreases by 2, AA decreases by 4

    B.

    ZZ increases by 1, AA remains same

    C.

    ZZ decreases by 1, AA remains same

    D.

    ZZ decreases by 2, AA decreases by 2

  3. 3.

    What is the SI unit of radioactivity?

    A.

    Curie (CiCi)

    B.

    Becquerel (BqBq)

    C.

    Rutherford (RdRd)

    D.

    Roentgen (RR)

Download the worksheet for Atoms and Nuclei - Radioactivity to practice offline. It includes additional chapter-level practice questions.

Nuclear Fission and Fusion

Subtopic

Nuclear Fission and Fusion under Atoms and Nuclei for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The energy released in both nuclear fission and fusion reactions is a result of the conversion of:

    A.

    Kinetic energy into potential energy

    B.

    Mass defect into energy

    C.

    Protons into electrons

    D.

    Chemical bonds into nuclear bonds

  2. 2.

    The enormous energy produced in the Sun and other stars is primarily due to which nuclear process?

    A.

    Nuclear Fission

    B.

    Nuclear Fusion

    C.

    Spontaneous Combustion

    D.

    Beta Decay

  3. 3.

    Which of the following materials is most commonly used as a moderator in a nuclear reactor to slow down fast neutrons?

    A.

    Liquid Sodium

    B.

    Boron Carbide

    C.

    Heavy Water (D2OD_2O)

    D.

    Cadmium rods

Download the worksheet for Atoms and Nuclei - Nuclear Fission and Fusion to practice offline. It includes additional chapter-level practice questions.

Atoms and Nuclei - ICSE Class 12 Physics Notes & Revision | Krit.club