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  • Question

  • Automobile ignition systems use the principle of


  • Options
  • A. resistance
  • B. self inductance
  • C. mutual inductance
  • D. capacitance

  • Correct Answer
  • mutual inductance 

    Explanation
    A high voltage is induced due to mutual inductance because the number of turns in secondary coil is very high.

    Materials and Components problems

    Search Results

    • 1. If ?0 is the angular frequency of rotation of electron in the absence of magnetic field, the angular frequency ?, when a magnetic field B is acting is ? ? ?0 + (e/2m)B.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. When an atom of polarizability a is placed in an electric field E, the energy stored in atom is 0.5 a E2.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The mass of proton and electron are

    • Options
    • A. 1.672 x 10-26 kg and 9.107 x 10-31 kg respectively
    • B. 9.107 x 10-26 kg and 9.107 x 10-31 kg respectively
    • C. 9.107 x 10-29 kg and 9.107 x 10-31 kg respectively
    • D. 9.107 x 10-30 kg and 9.107 x 10-31 kg respectively
      • Discuss
    • 4. Consider the following materials

      1. Nickel
      2. Silver
      3. Oxygen
      4. Aluminium
      The correct sequence in the order of decreasing permeability is

    • Options
    • A. 1, 4, 3, 2
    • B. 1, 4, 2, 3
    • C. 4, 1, 3, 2
    • D. 4, 1, 2, 3
      • Discuss
    • 5. Ferrimagnetic materials have anti-parallel orientation of equal moments of permanent dipoles.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The materials having low retentivity are suitable for making

    • Options
    • A. temporary smagnets
    • B. weak magnets
    • C. permanent magnets
    • D. both temporary and permanent magnets
      • Discuss
    • 7. The number of valence electrons in germanium atom is

    • Options
    • A. 4
    • B. 2
    • C. 1
    • D. zero
      • Discuss
    • 8. The carrier mobility in a semiconductor is 0.4 m2/Vs. Its diffusion constant at 300 K will be (in m2/s)

    • Options
    • A. 0.40
    • B. 0.16
    • C. 0.04
    • D. 0.01
      • Discuss
    • 9. Lines of magnetic field attract each other.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. If temperature is increased, the temperature coefficient of a metal

    • Options
    • A. increases
    • B. decreases
    • C. may increase or decrease
    • D. remains constant
      • Discuss

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