Magnetic Devices MCQs with Answers

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Magnetic Devices Online Quiz

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• Test Name: Magnetic Devices MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Magnetic Devices

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1 / 40

What device uses magnetic fields to store data?

Hard drive

Flash drive

Solid-state drive

2 / 40

What is a Hall effect sensor used for?

Measuring temperature

Detecting magnetic fields

Measuring voltage

3 / 40

What is the function of a magnetic amplifier?

Store electrical energy

Amplify electrical signals

Reduce electrical noise

4 / 40

What is the primary purpose of a magnetic tape drive?

Signal amplification

Data storage

Power generation

5 / 40

Which device uses magnetic fields to read and write data on optical discs?

Blu-ray drive

DVD drive

Magneto-optical drive

6 / 40

What is the main advantage of using a magnetic levitation (maglev) system?

Reduced friction

Higher power consumption

Increased weight

7 / 40

What is the primary material used in the core of an electromagnet?

Aluminum

Copper

Iron

8 / 40

Which material is commonly used for making permanent magnets?

Neodymium

Aluminum

Copper

9 / 40

Which phenomenon is utilized in magnetic resonance imaging (MRI)?

Eddy currents

Nuclear magnetic resonance

Magnetostriction

10 / 40

What is the main function of a magnetic relay?

Store energy

Switch electrical circuits

Increase voltage

11 / 40

Which device converts electrical energy into mechanical motion using magnetism?

Transformer

Resistor

Electric motor

12 / 40

What property of materials determines their magnetic permeability?

Electrical conductivity

Magnetic permeability

Thermal resistance

13 / 40

What type of memory uses magnetic storage technology?

Magnetic tape

Flash memory

DRAM

14 / 40

What is the function of a magnetic sensor?

Measure temperature

Detect magnetic fields

Generate electricity

15 / 40

What is the key principle behind the operation of an inductor?

Induced electromotive force

Capacitance

Resistance

16 / 40

Which device measures the strength and direction of magnetic fields?

Voltmeter

Ammeter

Magnetometer

17 / 40

Which principle is employed by magnetic flow meters to measure fluid velocity?

Thermal expansion

Electromagnetic induction

Optical refraction

18 / 40

What type of device uses magnetostrictive materials?

LED light

Ultrasonic transducer

Solar cell

19 / 40

What type of device uses magnetic flux to measure rotational speed?

Tachometer

Barometer

Thermometer

20 / 40

What device uses magnetic fields to transfer electrical energy between two circuits?

Capacitor

Transformer

Diode

21 / 40

What is the primary use of a superconducting magnet?

Radios

Televisions

MRI machines

22 / 40

What type of magnetic device is used in credit cards for storing information?

RFID chip

Magnetic stripe

QR code

23 / 40

Which type of magnetic material retains its magnetism after the external magnetic field is removed?

Permanent magnet

Superconductor

Soft magnet

24 / 40

What type of device uses an electromagnet to produce sound?

Photovoltaic cell

Thermocouple

Loudspeaker

25 / 40

What is a primary application of a magneto-resistive sensor?

Heat sensing

Position sensing

Light sensing

26 / 40

Which device uses magnetic fields to deflect electron beams in CRT monitors?

Heat sink

Deflection yoke

Cathode ray tube

27 / 40

What is the primary use of magnetic shielding?

Store data

Reduce interference

Increase signal strength

28 / 40

What type of sensor is commonly used in anti-lock braking systems (ABS)?

Temperature sensor

Magnetic speed sensor

Pressure sensor

29 / 40

What is a common application of ferrite cores in electronics?

Amplifying signals

Reducing electromagnetic interference

Storing energy

30 / 40

What is the purpose of a magnetic field sensor in a smartphone?

Camera stabilization

Compass function

Touchscreen operation

31 / 40

What is the main purpose of a magnetic bearing?

Measure rotational speed

Reduce friction in rotating machinery

Increase friction in rotating machinery

32 / 40

What is the purpose of using magnetic nanoparticles in medical applications?

Measuring blood pressure

Monitoring heart rate

Targeted drug delivery

33 / 40

What is a common application of a solenoid?

Capacitor

Electromagnetic lock

Thermistor

34 / 40

Which phenomenon is used in magnetic levitation trains?

Electromagnetic suspension

Electrostatic suspension

Pneumatic suspension

35 / 40

What device uses the principle of electromagnetic induction to generate electricity?

Generator

Battery

Solar panel

36 / 40

What is the function of a magnetic levitation (maglev) train?

Use air pressure to lift and propel the train

Use hydraulic forces to lift and propel the train

Use magnetic forces to lift and propel the train

37 / 40

Which material is known for its high magnetic permeability?

Mu-metal

Plastic

Copper

38 / 40

What is the purpose of a magnetic latching relay?

Measure current

Maintain its state without continuous power

Convert AC to DC

39 / 40

What is the role of a magnetic clutch in automotive applications?

Increase engine power

Engage and disengage power transmission

Measure fuel efficiency

40 / 40

What is the primary function of a magnetic encoder?

Measure rotational position

Store data

Measure temperature

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