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9th Standard Science - Magnetism and Electromagnetism Model Question Paper Sep-30 , 2019

Magnetism and Electromagnetism 

9th Standard Science - Magnetism and Electromagnetism Model Question Paper

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)

    both AC 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

  6. The SI unit of magnetic field induction is__________

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    Tesla

  7. Devices which is used to convert high alternating current to low alternating current __________.

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    step down transformer

  8. A device for producing electric current is_________.

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    electric generator

  9. The laws of induction were given by___________

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    Faraday

  10. Magnetic lines of force never___________ each other

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    intersect

    11. 5 x 1 = 5

  11. A generator converts mechanical energy into electrical energy

    (a) True
    (b) False

  12. Magnetic field lines always repel each other and do not intersect.

    (a) True
    (b) False

  13. In a step down transformer the number of turns in primary coil is greater than that of the number of turns in the secondary coil.

    (a) True
    (b) False

  14. Magnetic field lines always repel each other and do not intersect

    (a) True
    (b) False

  15. A generator converts mechanical energy into electrical energy

    (a) True
    (b) False
    16. 5 x 1 = 5

  16. Magnetic material

    17. (1)

    Oersted

  17. Current and magnetism

    18. (2)

    Faraday

  18. Electric generator

    19. (3)

    Slip rings

  19. Force on the conductor

    20. (4)

    Iron

  20. Electric generator

    21. (5)

    ILB
    4 x 2 = 8

  21. Define magnetic flux density.

  22. List the main parts of an electric motor.

  23. Differentiate step up and step down transformer.

  24. Define magnetic field

    25. 4 x 3 = 12

  25. State an important advantage of ac over dc.

  26. State Faraday’s laws of electromagnetic induction.

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

    28. 2 x 5 = 10

  28. Explain the principle, construction and working of a dc motor.

  29. Explain two types of transformer.

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