2nd Year Physics Chapter 15 Online MCQ Test for 12th Class Physics Chapter 15 (Electromagnetic Induction)

Lenz's law presented in

• 1834 A
• 1934 B
• 1826 C
• 1836 D

The emf induced by the motion of a conductor across a magnetic field is called:

• Motional emf A
• Rotational emf B
• Induced emf C
• All of above D

• Lenz's law A
• Faraday's law B
• Ampere's law C
• None of these D

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

• NwAB A
• 2pi f B
• Maximum C
• Zero D

The unit of induced emf is

• Ampere A
• Volt B
• Joule/coulomb C
• Both (b) and (c) D

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

• 0.1 J A
• 10 J B
• 100 J C
• 1000 J D

The application of mutual induction is a.

• D.C. motor A
• Radio B
• Television C
• Transformer D

Commutator was invented by:

• William bills A
• William Gates B
• William tells C
• William Sturgeon D

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

• Lenz's law A
• Faraday's law B
• Ampere's law C
• Coulomb's law D

For step down transformer

• Ns>Np A
• Np > Ns B
• Ns = Np C
• Ns > > > Np D

The induction can be increased by winding the wire around a core made of.

• Copper A
• Silicon B
• Iron C
• Aluminum D

Self inductance of a long solenoid is given by

• 
  A
• 
  B
• 
  C
• None of the above D

Mutual induction play role in.

• Generator A
• D.C. motor B
• Galvanometer C
• Transformer D

If force in the direction of velocity of conductor,  then induced current is directed,

• Anti clockwise A
• Clock wise B
• At equilibrium C
• None of above D

The motional emf is give by

• qvB A
• IBL B
• eBL C
• vBL D

The Direction of induced current is always so as to oppose the change which causes the current, is:

• Faraday's law A
• Lenz's law B
• Ohm's law C
• Kirchhoff' s1ast rule D

Commentator was invented by

• Henry A
• Ousted B
• Maxwell C
• William sturgeon D