12th Grade Physics Exam: Quiz!

14 Questions | Total Attempts: 139

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12th Grade Physics Exam: Quiz!

. Preparing for the 12th-grade physics exam? Ready to take the quiz? As it pertains to this quiz, you must understand how many electron volts make up 1 joule and the electrons ejected from metals because of the effect of light. What is the refractive directory of the core in optical fibers, the angle of minimum deviation, and a wavefront due to a source situated at infinity? Good luck with this quiz.


Questions and Answers
  • 1. 
    An electron, an alpha-particle, and a proton have the same kinetic energy. Which of these particles has the shortest de Broglie wavelength?
    • A. 

      A. electron

    • B. 

      B. proton

    • C. 

      C. alpha-particle

  • 2. 
    How many electron volts makeup 1 Joule?
    • A. 

      (a) 6.25×10^18 eV.

    • B. 

      (b) 1.25×10^181 eV

    • C. 

      (c) 6.25×10^16 eV.

  • 3. 
    If the maximum Kinetic energy of electrons emitted in a photo-cell is 6 eV. What is the stopping potential?
    • A. 

      3 V

    • B. 

      12 V

    • C. 

      6 V

  • 4. 
    The electrons ejected from metals due to effect of light are called
    • A. 

      Primary electrons

    • B. 

      Thermions

    • C. 

      Photoelectrons

  • 5. 
    The frequency of the incident light falling on a photosensitive metal plate is doubled, stopping potential will be:
    • A. 

      Double the earlier value

    • B. 

      Unchanged

    • C. 

      More than doubled

  • 6. 
    A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen.
    • A. 

      (a) half the image will disappear.

    • B. 

      (b) intensity of image will decrease but complete image is formed.

    • C. 

      (c) intensity of image will increase but image is not distinct.

  • 7. 
    In optical fibers, the refractive index of the core is:
    • A. 

      Greater than that of the cladding.

    • B. 

      Smaller than that of the cladding.

    • C. 

      Equal to that of the cladding.

  • 8. 
    A metal coin is at bottom of a beaker filled with a liquid of refractive index = 4/3 to a height of 6 cm. To an observer looking from above the surface of the liquid, coin will appear at a depth.
    • A. 

      (a) 1.5 cm

    • B. 

      (b) 4.5 cm

    • C. 

      (c) 6.75 cm

    • D. 

      Option 4

  • 9. 
    The refractive index of the material of an equilateral prism is √3. What is the angle of minimum deviation?
    • A. 

      (a) 45°

    • B. 

      (b) 60°

    • C. 

      (c) 37°

    • D. 

      Option 4

  • 10. 
    In an experiment to find the focal length of a concave mirror, a graph is drawn between the magnitude of u and v. The graph looks like?
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

  • 11. 
    The wavefront due to a source situated at infinity is:
    • A. 

      Spherical

    • B. 

      Planar

    • C. 

      Cylindrical

  • 12. 
    A laser beam is coherent because it contains:
    • A. 

      (a) waves of several wavelengths.

    • B. 

      (b) coherent waves of a single wavelength.

    • C. 

      (c) coherent waves of several wavelengths

  • 13. 
    According to Huygens’ principle, light is a form of
    • A. 

      Particle

    • B. 

      Wave

    • C. 

      Radiation

  • 14. 
    Two coherent monochromatic light beams of intensities I and 41 superimpose. The maximum and minimum possible intensities in the resulting beam are:
    • A. 

      (a) 5I and I

    • B. 

      (b) 5I and 3I

    • C. 

      (d) 9I and I

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