MCQ in Electricity and Magnetism Fundamentals Part 5 | ECE Board Exam

(Last Updated On: April 12, 2018)
Electricity and Magnetism Fundamentals - MCQS Part V

This is the Multiple Choice Questions Part 5 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

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

Continue Practice Exam Test Questions Part 5 of the Series

201. Core materials of a good relay have _________ hysteresis loop.

  • A. large
  • B. narrow
  • C. very large
  • D. very narrow
View Answer:

Answer: Option B

Solution:

202. The magnetic materials should have a large hysteresis loss for one of the following applications.

  • A. Transformers
  • B. AC motors
  • C. Permanent Magnets
  • D. DC generators
View Answer:

Answer: Option C

Solution:

203. If the magnetic material is located within a coil through which alternating current (60 Hz frequency) flows, then __________ hysteresis loops will be formed every second.

  • A. 60
  • B. 120
  • C. 30
  • D. 180
View Answer:

Answer: Option A

Solution:

204. There are how many compounds available in nature?

  • A. 105
  • B. 1000
  • C. 300,000
  • D. Unlimited
View Answer:

Answer: Option D

Solution:

205. Hysteresis is a phenomenon of _________ in a magnetic circuit.

  • A. setting up constant flux
  • B. lagging of H behind B
  • C. lagging B behind H
  • D. leading B ahead H
View Answer:

Answer: Option C

Solution:

206. What is the measure of the density and sign of the electric charge at a point relative to that at some time?

  • A. Electric potential
  • B. Electric charge
  • C. Electric current
  • D. Electric intensity
View Answer:

Answer: Option A

Solution:

207. __________ is a substance of whose molecules consist of the same kind of atom.

  • A. Mixture
  • B. Compound
  • C. Element
  • D. Isotope
View Answer:

Answer: Option C

Solution:

208. Hipernik is an alloy containing __________ iron and __________ nickel.

  • A. 40% ; 60%
  • B. 60% ; 40%
  • C. 50% ; 50%
  • D. 70% ; 30%
View Answer:

Answer: Option A

Solution:

209. The mass of proton is __________ the mass of an electron.

  • A. equal to
  • B. about 1837 times
  • C. less than
  • D. 200 times
View Answer:

Answer: Option B

Solution:

210. What is the maximum number of electrons that can be accommodated in the last orbit of an atom?

  • A. 4
  • B. 2
  • C. 8
  • D. 18
View Answer:

Answer: Option C

Solution:

211. The electrons in the last orbit of an atom are called _______ electrons.

  • A. free
  • B. valence
  • C. bound
  • D. thermionic
View Answer:

Answer: Option B

Solution:

212. If the number of valence electrons of an atom is less than 4, the substance is called

  • A. a conductor
  • B. a semiconductor
  • C. an insulator
  • D. a superconductor
View Answer:

Answer: Option A

Solution:

213. If the number of valence electrons of an atom is more than 4, the substance is called

  • A. a semiconductor
  • B. a conductor
  • C. an insulator
  • D. a semi-insulator
View Answer:

Answer: Option C

Solution:

214. If the number of valence electrons of an atom is exactly 4, then the substance is called

  • A. a semiconductor
  • B. a conductor
  • C. an insulator
  • D. a cryogenic conductor
View Answer:

Answer: Option A

Solution:

215. If the number of valence electrons of an atom is less than 4, then the substance is probably

  • A. a metal
  • B. an insulator
  • C. a non-metal
  • D. a semiconductor
View Answer:

Answer: Option A

Solution:

216. One coulomb of charge consists of ________ electrons.

  • A. 624 × 10^16
  • B. 62.4 × 10^16
  • C. 6.24 × 10^16
  • D. 0.624 × 10^16
View Answer:

Answer: Option A

Solution:

217. A one cubic cm of copper has how many free electrons at room temperature?

  • A. 80 × 10^18
  • B. 8.5 × 10^22
  • C. 20 × 10^10
  • D. 50 × 10^20
View Answer:

Answer: Option B

Solution:

218. Electronic current in a wire is the flow of ____________ electrons.

  • A. free
  • B. valence
  • C. bound
  • D. loose
View Answer:

Answer: Option A

Solution:

219. Electromotive force in a circuit

  • A. causes free electrons to flow
  • B. increases the circuit resistance
  • C. maintains circuit resistance
  • D. is needed to make the circuit complete
View Answer:

Answer: Option A

Solution:

220. The resistance of a material is ____________ its area of cross-section.

  • A. directly proportional
  • B. independent of
  • C. inversely proportional to
  • D. equal to
View Answer:

Answer: Option C

Solution:

221. If the length and area of cross-section of a wire are doubled, then its resistance

  • A. becomes four times
  • B. becomes sixteen times
  • C. remains the same
  • D. becomes two times
View Answer:

Answer: Option C

Solution:

222. A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material three times as long and twice the cross-sectional area?

  • A. 30 ohms
  • B. 20 ohms
  • C. 15 ohms
  • D. 7 ohms
View Answer:

Answer: Option C

Solution:

223. What is the SI unit of specific resistance or resistivity?

  • A. Ohm-circular mil per inch
  • B. Ohm-circular mil per foot
  • C. Ohm-m
  • D. Ohm-cm
View Answer:

Answer: Option C

Solution:

224. The resistivity of a conductor ___________ with an increase in temperature.

  • A. increases
  • B. decreases
  • C. remains the same
  • D. becomes zero
View Answer:

Answer: Option A

Solution:

225. What is the SI unit of conductance?

  • A. Siemens
  • B. Mhos
  • C. Ohms
  • D. 1/Ohms
View Answer:

Answer: Option A

Solution:

226. If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 × 10^-8 Ω, then its resistivity is

  • A. 3.2 × 10^-8 Ω-m
  • B. 1.6 × 10^-8 Ω-m
  • C. 0.64 × 10^-8 Ω-m
  • D. 0.16 × 10^-8 Ω-m
View Answer:

Answer: Option B

Solution:

227. What is the SI unit of conductivity?

  • A. Ohms/m
  • B. Ohms-m
  • C. Siemens-m
  • D. Siemens/m
View Answer:

Answer: Option D

Solution:

228. The temperature coefficient of resistance of conductors is

  • A. positive
  • B. zero
  • C. negative
  • D. infinite
View Answer:

Answer: Option A

Solution:

229. The temperature coefficient of resistance of semiconductors is

  • A. positive
  • B. zero
  • C. negative
  • D. infinite
View Answer:

Answer: Option C

Solution:

230. What determines the value of the temperature coefficient of resistance of a material?

  • A. length
  • B. cross-sectional area
  • C. volume
  • D. nature and temperature
View Answer:

Answer: Option D

Solution:

231. The temperature coefficient of resistance of a conductor ________ with an increase in temperature.

  • A. increases
  • B. decreases
  • C. remains the same
  • D. becomes negative
View Answer:

Answer: Option B

Solution:

232. The temperature coefficient of resistance of insulators is

  • A. zero
  • B. negative
  • C. positive
  • D. infinite
View Answer:

Answer: Option B

Solution:

233. The temperature coefficient of resistance of eureka is

  • A. positive
  • B. negative
  • C. almost zero
  • D. infinite
View Answer:

Answer: Option C

Solution:

234. If the value of α0 a conductor is 1/234 per oC, then the value of α18 is

  • A. 1/218 per °C
  • B. 1/252 per °C
  • C. 1/272 per °C
  • D. 1/273 per °C
View Answer:

Answer: Option B

Solution:

235. If the value of α25 a conductor is 1/255 per °C, then the value of α20 is

  • A. 1/300 per °C
  • B. 1/250 per °C
  • C. 1/230 per °C
  • D. 1/260 per °C
View Answer:

Answer: Option B

Solution:

236. If the value of α25 of a conductor is 1/230 per °C, then the value of α0 is

  • A. 1/180 per °C
  • B. 1/150 per °C
  • C. 1/280 per °C
  • D. 1/230 per °C

View Answer:

Answer: Option A

Solution:

237. Ohm’s law cannot be applied to which material?

  • A. Copper
  • B. Silver
  • C. Silicon carbide
  • D. Aluminum
View Answer:

Answer: Option C

Solution:

238. What is the practical unit of electrical energy?

  • A. Watt
  • B. Kilowatt-hour
  • C. Kilowatt-second
  • D. Megawat-hour
View Answer:

Answer: Option B

Solution:

239. A 200-watt lamp working for 24 hours will consume approximately _______ units.

  • A. 50
  • B. 5
  • C. 24
  • D. 0.5
View Answer:

Answer: Option B

Solution:

240. The hot resistance of an incandescent lamp is about _________ its cold resistance.

  • A. 10 times
  • B. 100 times
  • C. 5 times
  • D. 50 times
View Answer:

Answer: Option A

Solution:

241. Under ordinary conditions, a body is considered

  • A. positively charged
  • B. neutral
  • C. negatively charged
  • D. stable
View Answer:

Answer: Option B

Solution:

242. A positively charged body has

  • A. deficit of electrons
  • B. excess of neutrons
  • C. excess of electrons
  • D. deficit of protons
View Answer:

Answer: Option A

Solution:

243. A negatively charge body has

  • A. deficit of electrons
  • B. excess of protons
  • C. excess of electrons
  • D. deficit of neutrons
View Answer:

Answer: Option C

Solution:

244. This paper does not exhibit electricity because it contains the same number of

  • A. protons and electrons
  • B. neutrons and electrons
  • C. neutrons and positrons
  • D. atoms
View Answer:

Answer: Option A

Solution:

245. What is the value of the absolute permittivity of air?

  • A. 8.854 μF/m
  • B. 8.854 × 10^-12 mF/m
  • C. 8.854 × 10^-12 F/m
  • D. 8.854 × 10^-12 μF/m
View Answer:

Answer: Option C

Solution:

246. What is the relative permittivity of air?

  • A. 0
  • B. 1
  • C. 8.854 × 10^-12
  • D. 4π × 10^-7
View Answer:

Answer: Option B

Solution:

247. If two similar charges 1 coulomb each are placed 1 m apart in air, then the force of repulsion is

  • A.8 × 10^6 N
  • B. 9 × 10^9 N
  • C. 10^6 N
  • D. 5 × 10^6 N
View Answer:

Answer: Option B

Solution:

248. If the relative permittivity of a material is 10, then its permittivity is

  • A. 4π × 10^-7 F/m
  • B. 4π × 10^-6 F/m
  • C. 8.854 × 10^-11 F/m
  • D. 8.854 × 10^-12 F/m
View Answer:

Answer: Option C

Solution:

249. The force between two charges placed a given distance apart ________ as the relative permittivity of the medium is increased.

  • A. increases
  • B. decreases
  • C. remains unchanged
  • D. becomes infinite
View Answer:

Answer: Option B

Solution:

250. What is another name for relative permittivity?

  • A. Dielectric strength
  • B. Electric intensity
  • C. Potential gradient
  • D. Dielectric constant
View Answer:

Answer: Option D

Solution:

Questions and Answers in Electricity and Magnetism Fundamentals

Following is the list of multiple choice questions in this brand new series:
MCQ in Electricity and Magnetism Fundamentals
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI
PART 7: MCQs from Number 301 – 350                 Answer key: included
PART 8: MCQs from Number 351 – 400                Answer key: included
PART 9: MCQs from Number 401 – 450                 Answer key: included
PART 10: MCQs from Number 451 – 500                 Answer key: included

Complete List of MCQs in Electronics Engineering per topic

MCQ in Electricity and Magnetism Fundamentals Part 5 | ECE Board Exam
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