ICS Part 2 Physics Chapter 15 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.

Question # 2

What is DC motor?Write its principle.

Ans 1: AD.c motor is a device which converts D.C electrical energy into mechanical energy.The basic principle of electric motor is that a current carrying coil placed in magnetic field experiences a torque which is given by t=NIAB cos theta.

Question # 3

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 # 4

Write two similarities and two difference between motor and generator.

Ans 1: Similarities:
1. Construction of a motor is similar to a generator.
2. In both,magnetic field is provided by an electromagnet.
Differences:
1. Generators convert mechanical energy into electrical energy while motor converts electrical energy into mechanical energy.
2. In generator,the armature coil is rotated in the magnetic field and the current is the output.While in motor,armature is connected to battery,which rotated the armature.

Question # 5

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

Ans 1: Induced emf can be induced by electromagnetic induction.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.

Question # 6

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.

Question # 7

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.

Question # 8

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

Ans 1: Yes the induced current depend upon the resistance of the circuit.
By ohm's law
I=e/R
Thus the induced current depends on the resistance of the circuit.

Question # 9

What is meant by back emf?Write its SI units.

Ans 1: The emf induced across the ends of a coil due to the changing current in the same coil is called self induced emf or back emf.Its SI unit is Volt(V).

Question # 10

Is it possible to change both the area of the loop and magnetic field passing through the loop and still have bo induced emf in the loop?Explain briefly.

Ans 1: Yes,it the plane of the loop is kept parallel to the direction of the magnetic field magnetic flux through the coil will be zero,no emf will induced in the loop either by changing its area or by changing the magnetic field.

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

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

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

What is DC motor?Write its principle.

What is electromagnet?Mention two practical example of electromagnet.

Write two similarities and two difference between motor and generator.

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

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

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

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

What is meant by back emf?Write its SI units.

Is it possible to change both the area of the loop and magnetic field passing through the loop and still have bo induced emf in the loop?Explain briefly.

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

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

What is DC motor?Write its principle.

What is electromagnet?Mention two practical example of electromagnet.

Write two similarities and two difference between motor and generator.

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

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

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

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

What is meant by back emf?Write its SI units.

Is it possible to change both the area of the loop and magnetic field passing through the loop and still have bo induced emf in the loop?Explain briefly.

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

Can an electron at rest be set in motion with magnet?Explain

Define mutual induction.

What is back emf in motors?

Define induced emf and induced current.

What is back motor effect in generators?

Is it possible to change both the area of the loop and magnetic field passing through the loop and still have bo induced emf in the loop?Explain briefly.

State the Lenz's law and define Henry.

How the power is lost due to eddy current in a transformer and how this loss can be minimized?

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

Define electromagnetic induction.

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

Distinguished between AC generator and transformer.

When the primary of a transformer is connected to A.C mains,the current it is very small if the secondary circuit is open.Explain.

A glass rod of "L"Length is moving perpendicular to the applied magnetic field P with velociety v.Explain briefly about the induced emf in it.

What is electromagnet?Mention two practical example of electromagnet.

Can an electron at rest be set in motion with magnet?Explain

Define induced emf and induced current.

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

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

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

Name the factor upon which the self inductance depends.

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

Define self induction and mutual induction.

What is meant by back emf?Write its SI units.

When the primary of a transformer is connected to A.C mains,the current it is very small if the secondary circuit is open.Explain.

Define the SI unit of mutual inductance.

What is back motor effect in generators?

State the Lenz's law and define Henry.

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

Can a transformer be used with D.C? Explain

Can step up transformer increase the power level?

Does the induced emf always act to decrease the magnetic flux through a circuit?

ICS Part 2 Physics Chapter 15 Short Questions Preparation

Is this page helpful?

Share your comments & questions here

12th Class Physics
Short Questions Preparation