Question # 1

Electromagnetic induction is exactly according to law of:

Choose an answer

Momentum

Charge

Energy

Mass

If magnetic field is doubled then magnetic energy density becomes.

Choose an answer

Four times

Two times

Three times

Six times

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

Choose an answer

NwAB

2pi f

Maximum

Zero

Commutator was invented by:

Choose an answer

William bills

William Gates

William tells

William Sturgeon

Electromagnetic induction obeys law of conservation

Choose an answer

Charge

Energy

Momentum

Mass

When the back emf in a current is zero, it draws

Choose an answer

Zero current

Maximum current

Minimum current

Steady average current

Michael Faraday and Joseph Henry belongs to

Choose an answer

England and USA

France and USA

China and USA

None of these

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

Choose an answer

Current

Power

Voltage

Direction of winding

When back emf in motor is zero, it draws.

Choose an answer

Zero current

Minimum current

Maximum current

Steady current

If 10 A current passes through 100 mH inductor, then energy stored is.

Choose an answer

100 J

5 J

20 J

Zero

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

Choose an answer

50

100

150

200

Induced emf in A.C. generator can be increased by

Choose an answer

Decreasing area of coil

Decreasing magnetic field

Increasing area of coil

Slowing down speed of coil

The motional emf depends upon the

Choose an answer

Length of conductor

Speed of conductor

Strength of magnet

All of these

In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:

Choose an answer

0.2 henry

0.1 henry

0.8 henry

0.04 henry

The motional emf is give by

Choose an answer

qvB

IBL

eBL

vBL

In D.C. generator, split rings act as.

Choose an answer

Capacitor

Commutator

Resistor

Inductor

Output of D.C. motor is

Choose an answer

A.C. energy

Mechanical energy

Chemical energy

D.C. energy

More Classes

Other Links

Physics FSC Part 2 Chapter 15 Online MCQ's Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer