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Sample 3 Mark Creative Questions (New Syllabus) 2020

12th Standard EM

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Physics

Time : 01:00:00 Hrs
Total Marks : 57

    Part A

    19 x 3 = 57
  1. What is principle used in Microwave oven? Explain.

  2. Explain the Lightning arrester or lightning conductor.

  3. How does one can understand the temperature dependence of resistivity of a conductor?

  4. Explain Peltier effect.

  5. State that a current carrying loop behaves as a magnetic dipole. Hence write an expression for its magnetic dipole moment.

  6. How will the magnetic field intensity at the contre of a circular coil carrying current change if the current through the coil is doubled and the radius of the coil is halved?

  7. What is the phase relation between current and emf in an AC circuit containing a cpacitor only? Sketch a graph showing the variation the reactance of a capacitor with frequency.

  8. What is impedance? When does LCR circuit have minimum impedance?

  9. Write the production of gamma rays and mention its properties and uses.

  10. Identify the Electromagnetic waves whose wavelength vary as
    (a) 10-12 m to 10-8 m
    (b) 10-4m and write their uses.

  11. What is focus (or) focal point of a mirror?

  12. Write the drawbacks of Nicol prism.

  13. (a) Define the term 'intensity of radiation' in terms of photon picture of light.
    (b) Two monochromatic beams, one red and the other blue; have the same intensity. In which case
    (i) the number of photons per unit area per second is larger,
    (ii) the maximum kinetic energy of the photoelectrons is more? Justify you answer.

  14. Show the variation of photocurrent with collector plate potential for different frequencies but same intensity of incident radiation.

  15. Write the properties of neutrino?

  16. Give the Schematic representation of valence band, conduction band, and forbidden energy gap. and draw energy band structure of
    (a) Insulators
    (b) Semiconductors
    (c) Metals?

  17. What are the advantages of FM

  18. Explain why TV transmission towers made high.

  19. Write the aim of artificial intelligence in robots.

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