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

  • Total Questions10

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Physics - 12th Class Physics Chapter 4 Short Questions Preparation

Question # 1

Can a transformer be used with D.C? Explain

  • Ans 1: No As transformer works on the principle of electromagnetic induction,which is produced by A.C and not by D.C,To induced a voltage in the secondary coil it is necessary to have magnetic flux change.
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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

Can a transformer be used with D.C? Explain

  • Ans 1: No As transformer works on the principle of electromagnetic induction,which is produced by A.C and not by D.C,To induced a voltage in the secondary coil it is necessary to have magnetic flux change.
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12th Class Physics Chapter 4 Short Questions Preparation - Set 2

Question # 1

What is back emf in motors?

  • Ans 1: When to coil motor rotates across the magnetic field by the applied potential difference V,an emf is induced in it.The induced emf is in such a direction that opposes the emf running motor.Due to this reasons,the induced emf is called back emf of the motor.The magnitude of the back emf increase with the speed of motor.
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12th Class Physics Chapter 4 Short Questions Preparation - Set 3

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

Question # 1

What is electromagnet?Mention two practical example of electromagnet.

  • Ans 1: When a specimen of iron is placed inside a current carrying solenoid,it becomes and electromagnet.Examples are
    1. Transformers
    2. Motors
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Physics
15th Chapter

12th Class Physics Ch 15 Preparation

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