MCQ in Electricity and Magnetism Fundamentals Part 8 | ECE Board Exam

(Last Updated On: November 25, 2020)

This is the Multiple Choice Questions Part 8 of the Series in Electricity and Magnetism Fundamentals as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQ in Atomic Structure
• MCQ in Electric Charge
• MCQ in Ohm’s Law, Kirchhoff Law, Coulomb’s Law, etc
• MCQ in Magnetic Power
• MCQ in Magnetic Field and Magnetic Flux
• MCQ in Magnetic and Electric Quantities / Units
• MCQ in Magnetic/Electromagnet Principles

Continue Practice Exam Test Questions Part 8 of the Series

Choose the letter of the best answer in each questions.

351. Ion is __________.

A. an atom with unbalanced charges

B. free electron

C. proton

D. nucleus without protons

352. What will happen to an atom if an electron is either taken out or taken into the same atom?

A. Becomes negative ion

B. Becomes positive ion

C. Becomes an ion

D. Nothing will happen

353. When an atom gains an additional _________, it results to a negative ion.

A. neutron

B. proton

C. electron

D. atom

354. An electrical insulator can be made a conductor by

A. ionizing

B. electroplating

C. oxidizing

D. metalization

355. Refers to the lowest voltage across any insulator that can cause current flow.

A. conduction voltage

B. breakdown voltage

C. voltage flow

D. voltage drop

356. Dielectric is another name for

A. conductor

B. semiconductor

C. insulator

D. semi-insulator

357. When all atoms of a molecule are the same, the substance is called

A. a crystal

B. an element

C. a compound

D. an ion

358. An isotope

A. has a negative charge

B. has a positive charge

C. might have either positive or negative charge

D. is neutral

359. Isotope means, the same element but with different number of

A. electrons

B. neutrons

C. protons

D. atoms

360. The particles that make up the lattice in ionic crystal

A. molecules

B. ions

C. electrons

D. neutrons

361. A structure for solids in which the position of atoms are predetermined

A. Crystalline

B. Polycrystalline

C. Lattice

D. Non-Crystalline

362. A solid, which has no defined crystal structure.

A. Crystalline

B. Non-crystalline

C. Amorphous

D. Non-crystalline or Amorphous

363. States that each electron in an atom must have a different set of quantum numbers.

A. Quantum principle

B. Fermi-Dirac principle

C. Spin principle

D. Exclusion principle

364. Given an atomic structure of a certain material, what data can you determine out from it?

A. atomic number

B. atomic mass

C. the number of protons and electrons

D. all of the above

365. Ideally, all atoms have the same number of positively charged protons and negatively charged electrons, and is therefore considered as

A. electrically neutral

B. physically stable

C. magnetically aligned

D. technically rigid

366. When the charge of an atom becomes unbalanced, the atom is said to carry

A. Electric charge

B. Magnetic charge

C. Electromagnetic charge

D. Electrical current

367. A charged atom is also known as

A. ion

B. anion

C. cation

D. domain

368. An atom or group of atoms that carries a net electric charge is called

A. ion

B. anion

C. cation

D. domain

369. A negative ion results when an atom

A. loss some of its inside electrons

B. loss some of its valence electrons

C. gains additional electron

D. gains additional proton

370. A positive ion has

A. excess of electrons

B. excess of neutrons

C. lack of electrons

D. lack of protons

371. What do you call a positively charged ion?

A. cathode

B. anion

C. cation

D. domain

372. What do you call a negatively charged ion?

A. electron

B. anion

C. cation

D. domain

373. __________ is the procedure by which an atom is given a net charge by adding or taking away electron.

A. Polarization

B. Irradiation

C. Ionization

D. Doping

374. Is a process by which an atom is constantly losing and then regaining electrons?

A. oxidation

B. passivation

C. metallization

D. ionization

375. The process in which atoms are changed into ions.

A. oxidation

B. passivation

C. metallization

D. ionization

376. Gases with charged particles.

A. inert

B. plasma

C. conductive

D. reactive

377. One Coulomb of charge has how many electrons?

A. 6.24 x 10^18 electrons

B. 6.24 x 10^19 electrons

C. 62.4 x 10^18 electrons

D. 62.4 x 10^19 electrons

378. Coulomb is the SI unit of charge, how about in cgs?

A. Statcoulomb

B. electron volt

C. electron unit

D. static unit

379. Statcoulomb is also known as

A. electrostatic unit (esu)

B. electron volt

C. electron unit

D. static unit

380. An isolated body under normal condition is always

A. neutral

B. positively charged

C. negatively charged

D. ionized

381. What is the charge magnitude, Q of a body if it lacks 5 electrons?

A. 5 x 10^-19 Coulomb

B. 5 Coulomb

C. 8 x 10^-19 Coulomb

D. 19 x 10^-19 Coulomb

382. The net movement of charged particles in one direction or another.

A. flow

B. current

C. drift current

D. diffusion current

383. The rate at which electrons pass a given point in the circuit gives the magnitude of

A. electron current

B. magnetic current

C. drift current

D. diffusion current

384. The unit of current.

A. Ampere

B. Ampere/sec.

C. Ampere-sec.

D. Ampere-hr.

385. The unit Ampere is equivalent to

A. one Coulomb/second

B. one Coulomb/min

C. one Joule/sec

D. one Joule/min

386. When one coulomb of electric charge continuously passes a given point every second, the electric current is said to

A. 1 µA

B. 1 mA

C. 1 A

D. 10 A

387. One ampere is equal to how many electrons per second?

A. 1 x 10^18 electrons/sec.

B. 1 x 10^19 electrons/sec.

C. 6.25 x 10^18 electrons/sec.

D. 6.25 x 10^19 electrons/sec.

388. The bigger the diameter of a wire,

A. more current can pass

B. less current can pass

C. more heat is generated when current flow

D. the higher is the electrical resistance

389. If in a material, current can hardly pass, it means

A. the material is very hard

B. the material is very soft

C. the material has high resistance

D. the material has less resistance

390. The greater the diameter of a wire, the _______ is the resistance.

A. greater

B. lesser

C. harder

D. bigger

391. The longer the wire the ________ is the resistance

A. higher

B. lesser

C. harder

D. smaller

392. If a conductor’s cross-sectional area is doubled and its length is halved, the value of its resistance will

A. double

B. quadruple

C. decrease by a factor of two

D. decrease by a factor of four

393. The amount of resistance that a wire has with regards to the flow of electric current

A. is less for a conductor than for an insulator

B. is less for an insulator than for a semiconductor

C. is less for a semiconductor than for a conductor

D. is high for a semiconductor than for an insulator

394. The area of a conductor whose diameter is 0.001 inch is equal to

A. one angstrom

B. one circular mil

C. one micron

D. one steradian

395. A 100m long wire with a cross-sectional area A=10-3 m2 has a resistance of 10Ω.

Determine the resistivity of the wire.

A. 10^-2 Ω-m

B. 10^-3 Ω-m

C. 10^-4 Ω-m

D. 10^-5 Ω-m

396. the reciprocal of resistance

A. permeance

B. elastance

C. inductance

D. conductance

397. The science of physical phenomena at very low temperature, approaching absolute zero is called ________.

A. cryptanalysis

B. cybernetics

C. temperature inversion

D. cryogenics

398. What happens in the resistance of copper wire when its temperature is raised?

A. decreased

B. steady

C. increased

D. zero

399. A wire has a resistance of 5Ω at room temperature and a temperature coefficient α = 4 x 10^-3/°C, calculate the wire resistance at 75°C.

A. 8.925 Ω

B. 7.925 Ω

C. 6.925 Ω

D. 6.050 Ω

400. The temperature coefficient of resistance of a certain wire is known to be 0.004/°C at zero degrees Celsius. What would be the temperature coefficient at room temperature?

A. 0.00018/°C

B. 0.00036/°C

C. 0.00180/°C

D. 0.00360/°C

Questions and Answers in Electricity and Magnetism Fundamentals

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