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    12th Physics EM - 2nd Revision Test 2022 Model Question Paper - A Series - English Medium PDF Download

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    subashini udayakumar
    This document contains a physics exam paper with four parts - multiple choice questions, short answer questions, long answer questions, and numerical problems. It tests concepts in optics, waves, quantum physics, and more. The exam has 70 total marks and is allowed 3 hours for completion. It provides instructions for answering the various types of questions and covers topics such as telescopes, reflection, refraction, interference, diffraction, photoelectric effect, and more.

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    12th Physics EM - 2nd Revision Test 2022 Model Question Paper - A Series - English Medium PDF Download

    Uploaded by

    subashini udayakumar
    48 views4 pages
    This document contains a physics exam paper with four parts - multiple choice questions, short answer questions, long answer questions, and numerical problems. It tests concepts in optics, waves, quantum physics, and more. The exam has 70 total marks and is allowed 3 hours for completion. It provides instructions for answering the various types of questions and covers topics such as telescopes, reflection, refraction, interference, diffraction, photoelectric effect, and more.

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    This document contains a physics exam paper with four parts - multiple choice questions, short answer questions, long answer questions, and numerical problems. It tests concepts in optics, waves, quantum physics, and more. The exam has 70 total marks and is allowed 3 hours for completion. It provides instructions for answering the various types of questions and covers topics such as telescopes, reflection, refraction, interference, diffraction, photoelectric effect, and more.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    48 views4 pages

    12th Physics EM - 2nd Revision Test 2022 Model Question Paper - A Series - English Medium PDF Download

    Uploaded by

    subashini udayakumar
    This document contains a physics exam paper with four parts - multiple choice questions, short answer questions, long answer questions, and numerical problems. It tests concepts in optics, waves, quantum physics, and more. The exam has 70 total marks and is allowed 3 hours for completion. It provides instructions for answering the various types of questions and covers topics such as telescopes, reflection, refraction, interference, diffraction, photoelectric effect, and more.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 4

    www.Padasalai.Net www.Padasalai.

    Org

    A Number of Printed Pages : 04 50512 (RS)


    Register No. :

    PART – III
    ,aw;gpay; / PHYSICS
    (English Version)
    Time Allowed: 3:00 Hours] [ Maximum Marks: 70
    Instructions :
    (1) Check the question paper for fairness of printing. If there is any lack of fairness,
    inform the Hall Supervisor immediately.
    (2) Use Blue or Black ink to write and underline and pencil to draw diagrams.

    PART – I
    Note : (i) Answer all the questions. 15x1=15
    (ii) Choose the most appropriate answer from the given four alternatives and write the
    option code and the corresponding answer.

    1.

    2.
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    An astronomical refracting telescope will have large angular magnification and high
    angular resolution, when it has an objective lens of
    (a) Small focal length and large diameter
    (c) Small focal length and small diameter
    (b) Large focal length and small diameter
    (d) Large focal length and large diameter
    An electron is accelerated through a potential difference of 10,000 V. Its de Broglie
    wavelength is, (nearly) : (me= 9 × 10–31 kg)
    (a) 12.2 nm (b) 12.2 × 10–13 m (c) 12.2 × 10–12 m (d) 12.2 × 10–14 m
    3. Which colour of the light has the longest wavelength?
    (a) Violet (b) Red (c) Blue (d) Green
    4. In total internal reflection when the angle of incidence is equal to the critical angle for the
    pair of media in contact, what will be angle of refraction?
    (a) 900 (b) 1800 (c) 00 (d) Equal to angle of incidence
    5. For light incident from air on a slab of refractive index 2, the maximum possible angle of
    refraction is,
    (a) 300 (b) 450 (c) 600 (d) 900

    A [Turn Over

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    6. In Young’s double slit experiment, if the separation between coherent sources is halved
    and the distance of the screen from the coherent sources is doubled, then the fringe
    width becomes:
    (a) half (b) four times (c) one-fourth (d) double
    7. A lens of large focal length and large aperture is best suited as an objective of an astronomical
    telescope since
    (a) A large aperture contributes to the quality and visibility of the images.
    (b) A large area of the objective ensures better light gathering power.
    (c) A large aperture provides a better resolution. (d) All of the above
    8. In an electromagnetic wave travelling in free space the rms value of the electric field is 3 V m−1.
    The peak value of the magnetic field is
    (a) 1.414 × 10−8 T (b) 1.0 × 10−8 T (c) 2.828 × 10−8 T (d) 2.0 × 10−8 T
    9. The electric and the magnetic field, associated with an electromagnetic wave, propagating along
    X axis can be represented by
    (a) E = E ȷ and B = B k (b) E = E k and B = B ȷ

    10.

    11.
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    (c) E = E ı and B = B ȷ
    The dimension of

    (a) [L T−1]
    is

    (b) [L2 T−2]


    The transverse nature of light is shown in,
    (d) E = E ȷ and B = B ı

    (c) [L−1 T] (d) [L−2 T2]

    (a) interference (b) diffraction (c) scattering (d) polarization


    12. Emission of electrons by the absorption of heat energy is called………emission.
    (a) photoelectric (b) field (c) thermionic (d) secondary
    13. The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is
    (a) 4125Å (b) 3750Å (c) 6000Å (d) 2062.5Å
    14. A plane glass is placed over a various coloured letters (violet, green, yellow, red) The letter
    which appears to be raised more is,
    (a) red (b) yellow (c) green (d) violet

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    15. When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a
    plane sheet of glass. This implies that the liquid must have refractive index,
    (a) less than one (b) less than that of glass
    (c) greater than that of glass (d) equal to that of glass

    PART – II
    Note : Answer any six questions. Question number 24 is compulsory. 6x2=12

    16. What are the uses of Fraunhofer lines?


    17. What is called pointing vector? Give its unit.
    18. What are the conditions to achieve total internal reflection?
    19. One type of transparent glass has refractive index 1.5. What is the speed of light through this
    glass?
    20. Why does sky appear blue?
    21. State Huygens’s principle.
    22. Define work function of a metal. Give its unit.

    Padasalai.Net
    23.
    24.
    Define threshold frequency
    How many photons of frequency 1014 Hz will make up 19.86 J of energy?

    PART – III
    Note : Answer any six questions. Question number 33 is compulsory. 6x3=18

    25. Write a note on ultra violet rays and radio waves.


    26. Explain the properties of electromagnetic waves
    27. Explain the applications of X-rays
    28. Obtain the relation between focal length (f) and radius of curvature (R) of the spherical mirror.
    29. Derive an expression for de-Broglie wavelength of electrons.
    30. Distinguish between interference and diffraction.
    31. The thickness of a glass slab is 0.25 m. it has a refractive index of 1.5. A ray of light is incident
    on the surface of the slab at an angle of 600. Find the lateral displacement of the light when it
    emerges from the other side of the mirror.
    32. State and prove Brewster’s law.

    A [Turn Over

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    33. Two light sources with amplitudes 4 units and 2 units respectively interfere with each other.
    Calculate the ratio of maximum and minimum intensities.

    PART – IV
    Note : Answer all the questions. 5x5=25

    34. Obtain Einstein’s photoelectric equation with necessary explanation.


    (OR)
    Write down Maxwell equations in integral form.

    35. Describe the Fizeau’s method to determine speed of light.


    (OR)
    Give the construction, working and applications of photo emissive cell.

    36. Obtain Lens maker formula and mention its significance.

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    37.
    (OR)
    Obtain the equation for Path difference and bandwidth in Young’s double slit experiment.

    Explain in detail the absorption spectra.


    (OR)
    Discuss about astronomical telescope with magnification.

    38. Describe briefly Davisson-Germer experiment which demonstrated the wave nature of electron.
    (OR)
    Derive the mirror equation and the equation for lateral magnification

    -0O0-
    DEPARTMENT OF PHYSICS
    SRMHSS I KAVERIYAMPOOND I TIRUVANNAMALAI.

    Please Send Your Model Questions to our Email Id: padasalai.net@gmail.com

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