ICS Part 2 Physics Chapter 15 Short Questions Preparation

Question # 1

What is D.C motor?Write down part of D.C motor.

Ans 1: D.C motor is a device which converts electrical energy into mechanical energy.Main part of D.C motor are commutator ,armature and permanent magnet or electromagnet.

Question # 2

State Faraday's law of electromagnetic induction.

Ans 1: It states that
"The average emf induced in a conducting coil of N loops is equal to the negative of the rate at which the magnetic flux through the coil is changing with time".

Question # 3

What happen to the current of a circuit if a load resistance of the circuit is much less than the power transferred?

Ans 1: The greater the load the larger the current is supplied by the generator,When the load resistance of the circuit is much less,small current is supplied by the generator.

Question # 4

Define self induction and also write its SI units.

Ans 1: The phenomena in which the changing current in a coil induce an emf in itself is called the self-induction.Its SI unit is VsA^-1.It is also called as henry(H).

Question # 5

Can step up transformer increase the power level?

Ans 1: No,a step up transformer can not increase the power level,in actual transformer,due of dissipation of energy in the coil the output power is always less than input power,Therefore a step up transformer can't increase power level.

Question # 6

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.

Question # 7

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

Question # 8

Define electromagnetic induction.

Ans 1: When a conductor is moved through a magnetic field,the electric current flow through the circuit,The emf produced in the conductor is called induced emf,and the current generated is called induced current.This phenomena is known as electromagnetic induction.

Question # 9

When the primary of a transformer is connected to AC mains the current in it increase when secondary circuit is closed.Explain why?

Ans 1: When the secondary circuit is closed the output power increase.To produce the power ,transformer will draw large current from the A.C mains to increase its primary power.

Question # 10

How does Lenz's law explain law of conservation of energy phenomena of electromagnetism induction?

Ans 1: When a rod is moving in the magnetic field towards right,an induced current flows through the loop in anticlockwise direction,Since current carrying rod experience a magnetic force opposite to that velociety.An external force equal in magnitude and opposite in direction must be applied to keep the rod moving with constant velocity.This dragging force provides the energy for the induced current to flow,This energy is the source of induced current.Thus electromagnetic induction is exactly according to law of conservation of energy.

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ICS Part 2 Physics Chapter 15 Short Questions Preparation

12th Class PhysicsShort Questions Preparation

12th Class Physics Chapter Wise Preparation

Online Short Questions For Chapter 4 "ICS Part 2 Physics Chapter 15 Short Questions Preparation "

Physics - ICS Part 2 Physics Chapter 15 Short Questions Preparation

What is D.C motor?Write down part of D.C motor.

State Faraday's law of electromagnetic induction.

What happen to the current of a circuit if a load resistance of the circuit is much less than the power transferred?

Define self induction and also write its SI units.

Can step up transformer increase the power level?

Name four methods to produce induce emf.

What is electromagnet?Mention two practical example of electromagnet.

Define electromagnetic induction.

When the primary of a transformer is connected to AC mains the current in it increase when secondary circuit is closed.Explain why?

How does Lenz's law explain law of conservation of energy phenomena of electromagnetism induction?

Prepare Complete Set Wise Questions For Chapter 4 "ICS Part 2 Physics Chapter 15 Short Questions Preparation "

Set 1

Set 2

Set 3

Set 4

ICS Part 2 Physics Chapter 15 Short Questions Preparation - Set 1

What is D.C motor?Write down part of D.C motor.

State Faraday's law of electromagnetic induction.

What happen to the current of a circuit if a load resistance of the circuit is much less than the power transferred?

Define self induction and also write its SI units.

Can step up transformer increase the power level?

Name four methods to produce induce emf.

What is electromagnet?Mention two practical example of electromagnet.

Define electromagnetic induction.

When the primary of a transformer is connected to AC mains the current in it increase when secondary circuit is closed.Explain why?

How does Lenz's law explain law of conservation of energy phenomena of electromagnetism induction?

ICS Part 2 Physics Chapter 15 Short Questions Preparation - Set 2

Distinguished between AC generator and transformer.

Define the SI unit of mutual inductance.

What is mean by commutator in D.C generator?

When the primary of a transformer is connected to AC mains the current in it increase when secondary circuit is closed.Explain why?

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

If area of the loop and magnetic field both are changing and still have no induced emf.Explain why?

Name four methods to produce induce emf.

What is D.C motor?Write down part of D.C motor.

Define motional emf and write its formula.

Name the factor upon which the self inductance depends.

ICS Part 2 Physics Chapter 15 Short Questions Preparation - Set 3

Define self induction and also write its SI units.

Can an electric motor be used to derive and electric generator with output from the generator being used to operate the motor?

Write down any one method used for the production of induced emf.

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

Why is split ring is used in DC generators in place of slips rings?

What is electromagnet?Mention two practical example of electromagnet.

Can step up transformer increase the power level?

State Faraday's law of electromagnetic induction.

State the Lenz's law and define Henry.

Define electromagnetic induction.

ICS Part 2 Physics Chapter 15 Short Questions Preparation - Set 4

If area of the loop and magnetic field both are changing and still have no induced emf.Explain why?

Does the induced current depend on the resistance of the circuit?

What is the working principle of transformer?Explain

State Faraday's law of electromagnetic induction.

Define the SI unit of mutual inductance.

How can the power losses be minimized in a transformer?

In a certain region the earth's magnetic field points vertically down,When a plane flies due north,which wing tip is positively charged?

Distinguished between AC generator and transformer.

What is D.C motor?Write down part of D.C motor.

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

ICS Part 2 Physics Chapter 15 Short Questions Preparation

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