Online Preparation of Physics Chapter 15 For 12th Class Fsc

Online Short Questions For Chapter 4 "12th Class Physics Chapter 4 Short Questions Preparation "

Try The Short Questions For 12th Class Physics Chapter 4 Short Questions Preparation

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Physics - 12th Class Physics Chapter 4 Short Questions Preparation

Question # 1

In a transformer there is no transfer of charge from the primary to the secondary.How is then the power transferred?

  • Ans 1: The power will be transferred because the two coils of transformer are magnetically linked i.e, the change of flux through one coil is linked with the other coil.
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Prepare Complete Set Wise Questions For Chapter 4 "12th Class Physics Chapter 4 Short Questions Preparation "

12th Class Physics Chapter 4 Short Questions Preparation - Set 1

Question # 1

In a transformer there is no transfer of charge from the primary to the secondary.How is then the power transferred?

  • Ans 1: The power will be transferred because the two coils of transformer are magnetically linked i.e, the change of flux through one coil is linked with the other coil.
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12th Class Physics Chapter 4 Short Questions Preparation - Set 2

Question # 1

Name four methods to produce induce emf.

  • Ans 1: An induce emf is produced in the loop if the magnetic flux through it changes.The methods to produce induced emf are:
    1. A bar magnet is moved towards the coil.
    2. By changing the area of the coil in a constant magnetic field.
    3. A coil of constant area is rotated in a constant magnetic field,
    4. The coil is placed in the magnetic field of an electromagnet.

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12th Class Physics Chapter 4 Short Questions Preparation - Set 3

Question # 1

What is mean by commutator in D.C generator?

  • Ans 1: Commutator consists of two split rings or two halves of a single ring.Each half of split ring is connected to each end of the rotating coil,It helps to maintain the output in the same direction by inverting lower halves if sine curve.
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12th Class Physics Chapter 4 Short Questions Preparation - Set 4

Question # 1

Can DC motor be turned into DC generator?What changes are required to be done?

  • Ans 1: Yes ,a D.C motor can be converted into D.C generator.For this armature of the motor is to be coupled with some rotating body.Due to rotation ,magnetic flux through the coil changes so and emf will be induced at the output.Hence the motor acts as a generator.
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15th Chapter

12th Class Physics Ch 15 Preparation

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