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Questions and Answers

What is the total number of marks for Section B?

  • 12 marks
  • 14 marks (correct)
  • 10 marks
  • 8 marks
  • How many questions does Section C include?

  • 7 questions
  • 6 questions
  • 5 questions (correct)
  • 8 questions
  • Which section of the question paper has the highest number of marks per question?

  • Section D (correct)
  • Section B
  • Section C
  • Section A
  • What type of questions does Section A consist of?

    <p>Very short answer type questions</p> Signup and view all the answers

    Which of the following statements about internal choices in the question paper is incorrect?

    <p>There are internal choices in every section.</p> Signup and view all the answers

    Which of these physical constants can be used in the question paper?

    <p>Boltzmann constant</p> Signup and view all the answers

    What is the mass of a neutron as provided in the question paper?

    <p>$1.675 imes 10^{-27}$ kg</p> Signup and view all the answers

    What is the allowed number of attempts for the internal choice in 2 questions of 2 marks each?

    <p>One question from each pair must be attempted.</p> Signup and view all the answers

    What is the expression for the speed of light in a medium with relative permittivity $oldsymbol{ ilde{ ext{ε}}_r}$ and relative magnetic permeability $oldsymbol{ ilde{ ext{μ}}_r}$?

    <p>$c = \frac{c_0}{\sqrt{\tilde{ε}_r \tilde{μ}_r}}$</p> Signup and view all the answers

    Which type of electromagnetic waves are used in radar systems for aircraft navigation?

    <p>Microwaves</p> Signup and view all the answers

    In the decay reaction $oldsymbol{Y ightarrow X + He + ext{energy}}$, which particles are involved?

    <p>Alpha particle and daughter nucleus</p> Signup and view all the answers

    What is the significance of heavy doping in the p- and n-sides of a zener diode?

    <p>To ensure a sharp breakdown voltage characteristic</p> Signup and view all the answers

    What is the binding energy per nucleon for the daughter nucleus in the decay of nucleus Y?

    <p>7.835 MeV</p> Signup and view all the answers

    How is the speed of the emitted alpha particle calculated in the nuclear decay reaction?

    <p>By equating kinetic and binding energies</p> Signup and view all the answers

    Which value represents the mass of the alpha particle emitted during the decay of nucleus Y?

    <p>$6.68 \times 10^{-27} kg$</p> Signup and view all the answers

    What is typically shown in the I-V characteristic of a zener diode used as a voltage regulator?

    <p>A vertical line at the zener breakdown voltage</p> Signup and view all the answers

    What does the magnetic dipole moment of a current carrying coil not depend on?

    <p>Material of the turns of the coil.</p> Signup and view all the answers

    What is the effect of a larger aperture of the objective lens in an astronomical telescope?

    <p>Increases the resolving power of the telescope.</p> Signup and view all the answers

    What is the refractive index of the liquid if a biconvex lens of glass with a refractive index of 1.47 becomes invisible in it?

    <p>1.47</p> Signup and view all the answers

    For a glass prism, which color light has the smallest angle of minimum deviation?

    <p>Red color.</p> Signup and view all the answers

    Which statement is not correct according to the Rutherford model?

    <p>The nucleus contains only neutrons.</p> Signup and view all the answers

    What is the relationship between the refractive index and the brightness of an image in optics?

    <p>Variable refractive index can impact brightness under specific conditions.</p> Signup and view all the answers

    What impact does the number of turns of the coil have on its magnetic dipole moment?

    <p>Increases the magnetic dipole moment.</p> Signup and view all the answers

    How does the angle of minimum deviation vary for different colors of light passing through a prism?

    <p>Higher frequency colors deviate more.</p> Signup and view all the answers

    What is the expression for the equivalent emf when two identical cells are connected in parallel?

    <p>$E_{eq} = E$</p> Signup and view all the answers

    What will be the effect on the voltage across an external resistance when the internal resistance of two identical cells is taken into account?

    <p>It decreases as R increases</p> Signup and view all the answers

    What is the expression for the magnetic moment (μ) of a circular coil?

    <p>$ u = NIr$</p> Signup and view all the answers

    How can a galvanometer be converted into an ammeter to measure a higher current?

    <p>By adding a shunt resistor in parallel</p> Signup and view all the answers

    What is the phase difference between voltage across a resistor and a capacitor in an AC circuit?

    <p>90 degrees</p> Signup and view all the answers

    What happens to the interference fringes when the distance between the screen and slits in Young's double-slit experiment is increased?

    <p>Fringe width increases</p> Signup and view all the answers

    What is the result of increasing the separation between the slits in Young’s double-slit experiment?

    <p>Decreases fringe spacing</p> Signup and view all the answers

    When the source slit is moved closer to the plane of the double slits, what is the expected effect on the interference fringes?

    <p>Fringe separation decreases</p> Signup and view all the answers

    What is the expression for the potential energy of a system of two point charges q1 and q2 located at r1 and r2 in an external electric field E?

    <p>U = k * (q1 * q2) * E * (r1 + r2)</p> Signup and view all the answers

    What is the value of the electric field E for x < 0, based on the description provided?

    <p>-200 N/C</p> Signup and view all the answers

    If the length of the cylinder is 20 cm and radius is 5 cm, where is the center of the cylinder located?

    <p>At the origin</p> Signup and view all the answers

    To find the net outward flux through the cylinder, which integral would be most relevant?

    <p>∫ E · A dA</p> Signup and view all the answers

    What is the relationship between the charges present inside the cylinder and the net electric flux through it, according to Gauss's law?

    <p>The net charge is equal to the net flux divided by the electric constant.</p> Signup and view all the answers

    In the regions defined, how does the electric field behave in terms of direction and magnitude?

    <p>It is uniform and acts in opposite directions with equal magnitude.</p> Signup and view all the answers

    What type of cylinder is described, based on the orientation and positioning relative to the electric field?

    <p>A right circular cylinder</p> Signup and view all the answers

    Given the mass of the alpha particle is 6.4 × 10–27 kg, how would this mass relate to the force experienced in the electric field?

    <p>The mass affects the force according to F = ma.</p> Signup and view all the answers

    Study Notes

    Examination Structure

    • Total of 37 compulsory questions in the paper.
    • Section A: Questions 1-20, very short answers, 1 mark each.
    • Section B: Questions 21-27, short answers, 2 marks each.
    • Section C: Questions 28-34, long answers, 3 marks each.
    • Section D: Questions 35-37, long answers, 5 marks each.
    • Internal options are provided for certain questions across different marks:
      • 2 questions of 1 mark
      • 2 questions of 2 marks
      • 1 question of 3 marks
      • All 3 questions of 5 marks.

    Instructions and Permissibility

    • Each section has specific instructions.
    • Calculators and log tables are not allowed during the exam.

    Physical Constants Values

    • Speed of light (c) = (3 \times 10^8 , \text{m/s})
    • Planck's constant (h) = (6.63 \times 10^{-34} , \text{Js})
    • Elementary charge (e) = (1.6 \times 10^{-19} , \text{C})
    • Permeability of free space ((\mu_0)) = (4\pi \times 10^{-7} , \text{T m A}^{-1})
    • Permittivity of free space ((\epsilon_0)) = (8.854 \times 10^{-12} , \text{C}^2 \text{N}^{-1} \text{m}^{-2})
    • Coulomb's constant = (\frac{1}{4\pi\epsilon_0} = 9 \times 10^9 , \text{N m}^2 \text{C}^{-2})
    • Mass of electron ((m_e)) = (9.1 \times 10^{-31} , \text{kg})
    • Mass of neutron = (1.675 \times 10^{-27} , \text{kg})
    • Mass of proton = (1.673 \times 10^{-27} , \text{kg})
    • Avogadro’s number = (6.023 \times 10^{23} , \text{per gram mole})
    • Boltzmann constant = (1.38 \times 10^{-23} , \text{JK}^{-1})

    Key Questions

    • Understanding the conditions under the Rutherford model, particularly it's assertion that atoms are largely empty.
    • The computation of equivalent emf and internal resistance in a parallel cell configuration.
    • Establishing the magnetic moment of a coil and conditions affecting it.
    • Application of optics concepts, including normal behavior of lenses in varying mediums.
    • The interpretation of interference patterns as depicted in Young's double slit experiment.
    • Analysis of electric fields within defined regions and their effect on point charges.

    Concepts in Focus

    • Magnetic field due to circular coils and their dependence on current, number of turns, and area.
    • The operation principles of a zener diode as a voltage regulator with appropriate I-V characteristics.
    • The dynamics of α-particle emission and calculation of speed based on binding energies.
    • Exploring the potential energy of charge systems in electric fields.

    Calculations and Derivations

    • Required to derive expressions for peak voltage across resistors and capacitors in AC circuits.
    • Evaluate the effect of altering physical conditions on light dispersion through prisms.
    • Understanding and applying concepts of electric flux and charge distribution in conductive materials.

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    Description

    This quiz outlines the structure and types of questions included in a comprehensive question paper. It covers various sections, detailing very short, short, and long answer types, each with specified marks. Ideal for students wanting to understand the assessment format in detail.

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