Magnetism and Electromagnetism Model Question Paper

9th Standard

    Reg.No. :
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Science

Time : 01:30:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Which of the following converts electrical energy into mechanical energy?

    (a)

    motor

    (b)

    battery

    (c)

    generator

    (d)

    switch

  2. The part of the AC generator that passes the current from the armature coil to the external circuit is

    (a)

    field magnet

    (b)

    split rings

    (c)

    slip rings

    (d)

    brushes

  3. Transformer works on.

    (a)

    AC only

    (b)

    DC only

    (c)

    bothAC and DC

    (d)

    AC nor effectively than DC

  4. The unit of magnetic flux density is

    (a)

    weber

    (b)

    weber/metre

    (c)

    weber/metre2

    (d)

    weber. metre2

  5. The direction of magnetic field around a straight conductor carrying current can be determined by____________

    (a)

    Fleming's left hand rule

    (b)

    Lenz's law

    (c)

    Right hand thumb rule

    (d)

    Fleming's right hand rule

  6. 5 x 1 = 5
  7. The SI unit of magnetic field induction is__________

    ()

    Tesla

  8. Devices which is used to convert high alternating current to low alternating current

    ()

    transformers

  9. A device for producing electric current is_________

    ()

    generator

  10. The laws of induction were given by___________

    ()

    Faraday

  11. Magnetic lines of force never___________ each other

    ()

    intersect

  12. 5 x 1 = 5
  13. A generator converts mechanical energy into electrical energy

    (a) True
    (b) False
  14. Magnetic field lines always repels each other and do not intersect.

    (a) True
    (b) False
  15. In a step down transformer the number of tums in primary coil is greater than that o fthe number  of turns in the secondary coil.

    (a) True
    (b) False
  16. Magnetic field lines always repel each other and do not intersect

    (a) True
    (b) False
  17. A generator converts mechanical energy into electrical energy

    (a) True
    (b) False
  18. 5 x 1 = 5
  19. Magnetic material

  20. (1)

    Oersted

  21. Current and magnetism

  22. (2)

    ILB

  23. Electric generator

  24. (3)

    Iron

  25. Force on the conductor

  26. (4)

    Slip rings

  27. Electric generator

  28. (5)

    Faraday

    4 x 2 = 8
  29. Define magnetic flux density

  30. List the main parts of an electric motor.

  31. Differentiate step up and step down transformer.

  32. Define magnetic field

  33. 4 x 3 = 12
  34. State an important advantage of ac over dc.

  35. State Faraday’s laws of electromagnetic induction.

  36. Can two magnetic lines of force intersect? Justify your answer

  37. The primary coil of a transformer has 800 turns and the secondary coil has 8 turns. It is connected to a 220 V ac supply. What will be the output voltage?

  38. 2 x 5 = 10
  39. Explain the principle, construction and working of a dc motor

  40. Explain two types of transformer.

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