Electricity & Magnetism MCQs with Answers

A magnetic needle is placed in a uniform magnetic field and is aligned with the field. The needle is now rotated by an angle of 60° and the work done is W. The torque on the magnetic needle at this position is _?

• A.W
• B.√3 W
• C.W/√3
• D.2W

Which device is used to convert Alternating Current (AC) to Direct Current (DC)?

• A.Transformer
• B.Rectifier
• C.Inverter
• D.Oscillator

SI Unit of Electromotive Force is?

• A.Volt
• B.Ampere
• C.Ohm
• D.Watt

The value of the temperature coefficient of a conductor is zero. This means that with a rise in temperature, the resistance of the conductor _?

• A.Increases
• B.Decreases
• C.Remains the same
• D.First increases then decreases

In the left-hand rule, the thumb always represents the direction of ?

• A.Force on Conductor
• B.Magnetic Field
• C.Electric Current
• D.None of these

The complete RC circuit consists of?

• A.Resistors and Capacitors
• B.Resistors and Inductors
• C.Capacitors and Inductors
• D.Resistors, Capacitors, and Inductors

Second/Ohm is equal to _?

• A.Weber
• B.Henry
• C.Farad
• D.Tesla

What is the flow of electric charge through a conductor called?

• A.Voltage
• B.Resistance
• C.Current
• D.Power

When a generator in the electrical system of a motor vehicle produces more electrical energy than required for ignition and for operating electrical accessories, the surplus (under certain conditions) passes through the battery to reverse the chemical reaction. This is known as the battery.

• A.Regulating
• B.Discharging
• C.Grounding
• D.Charging

A PN junction can be used as _?

• A.Amplifier
• B.Rectifier
• C.Oscillator
• D.Modulator