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

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

• MCQ in Atomic Structure
• MCQ in Electric Charge
• MCQ in Ohm’s Law, Kirchoff 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 5 of the Series

Choose the letter of the best answer in each questions.

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

A. large

B. narrow

C. very large

D. very narrow

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

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

Solution:

204. There are how many compounds available in nature?

A. 105

B. 1000

C. 300,000

D. Unlimited

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

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

Solution:

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

A. Mixture

B. Compound

C. Element

D. Isotope

Solution:

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

A. 40% ; 60%

B. 60% ; 40%

C. 50% ; 50%

D. 70% ; 30%

Solution:

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

A. equal to

C. less than

D. 200 times

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

Solution:

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

A. free

B. valence

C. bound

D. thermionic

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

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

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

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

Solution:

216. One coulomb of charge consists of ____________ electrons.

A. 624 ร 10^16

B. 62.4 ร 10^16

C. 6.24 ร 10^16

D. 0.624 ร 10^16

Solution:

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

A. 80 ร 10^18

B. 8.5 ร 10^22

C. 20 ร 10^10

D. 50 ร 10^20

Solution:

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

A. free

B. valence

C. bound

D. loose

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

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

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

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

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

Solution:

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

A. increases

B. decreases

C. remains the same

D. becomes zero

Solution:

225. What is the SI unit of conductance?

A. Siemens

B. Mhos

C. Ohms

D. 1/Ohms

Solution:

226. If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 ร 10^-8 โฆ, then its resistivity is

A. 3.2 ร 10^-8 โฆ-m

B. 1.6 ร 10^-8 โฆ-m

C. 0.64 ร 10^-8 โฆ-m

D. 0.16 ร 10^-8 โฆ-m

Solution:

227. What is the SI unit of conductivity?

A. Ohms/m

B. Ohms-m

C. Siemens-m

D. Siemens/m

Solution:

228. The temperature coefficient of resistance of conductors is

A. positive

B. zero

C. negative

D. infinite

Solution:

229. The temperature coefficient of resistance of semiconductors is

A. positive

B. zero

C. negative

D. infinite

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

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

Solution:

232. The temperature coefficient of resistance of insulators is

A. zero

B. negative

C. positive

D. infinite

Solution:

233. The temperature coefficient of resistance of eureka is

A. positive

B. negative

C. almost zero

D. infinite

Solution:

234. If the value of ฮฑ0 a conductor is 1/234 per oC, then the value of ฮฑ18 is

A. 1/218 per ยฐC

B. 1/252 per ยฐC

C. 1/272 per ยฐC

D. 1/273 per ยฐC

Solution:

235. If the value of ฮฑ25 a conductor is 1/255 per ยฐC, then the value of ฮฑ20 is

A. 1/300 per ยฐC

B. 1/250 per ยฐC

C. 1/230 per ยฐC

D. 1/260 per ยฐC

Solution:

236. If the value of ฮฑ25 of a conductor is 1/230 per ยฐC, then the value of ฮฑ0 is

A. 1/180 per ยฐC

B. 1/150 per ยฐC

C. 1/280 per ยฐC

D. 1/230 per ยฐC

Solution:

237. Ohmโs law cannot be applied to which material?

A. Copper

B. Silver

C. Silicon carbide

D. Aluminum

Solution:

238. What is the practical unit of electrical energy?

A. Watt

B. Kilowatt-hour

C. Kilowatt-second

D. Megawat-hour

Solution:

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

A. 50

B. 5

C. 24

D. 0.5

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

Solution:

241. Under ordinary conditions, a body is considered

A. positively charged

B. neutral

C. negatively charged

D. stable

Solution:

242. A positively charged body has

A. deficit of electrons

B. excess of neutrons

C. excess of electrons

D. deficit of protons

Solution:

243. A negatively charge body has

A. deficit of electrons

B. excess of protons

C. excess of electrons

D. deficit of neutrons

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

Solution:

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

A. 8.854 ฮผF/m

B. 8.854 ร 10^-12 mF/m

C. 8.854 ร 10^-12 F/m

D. 8.854 ร 10^-12 ฮผF/m

Solution:

246. What is the relative permittivity of air?

A. 0

B. 1

C. 8.854 ร 10^-12

D. 4ฯ ร 10^-7

Solution:

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

A.8 ร 10^6 N

B. 9 ร 10^9 N

C. 10^6 N

D. 5 ร 10^6 N

Solution:

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

A. 4ฯ ร 10^-7 F/m

B. 4ฯ ร 10^-6 F/m

C. 8.854 ร 10^-11 F/m

D. 8.854 ร 10^-12 F/m

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

Solution:

250. What is another name for relative permittivity?

A. Dielectric strength

B. Electric intensity

D. Dielectric constant

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: MCQ from Number 1 โ 50                        Answer key: PART 1
PART 2: MCQ from Number 51 โ 100                   Answer key: PART 2
PART 3: MCQ from Number 101 โ 150                 Answer key: PART 3
PART 4: MCQ from Number 151 โ 200                 Answer key: PART 4
PART 5: MCQ from Number 201 โ 250                 Answer key: PART 5
PART 6: MCQ from Number 251 โ 300                  Answer key: PART 6
PART 7: MCQ from Number 301 โ 350                  Answer key: included
PART 8: MCQ from Number 351 โ 400                  Answer key: included
PART 9: MCQ from Number 401 โ 450                  Answer key: included
PART 10: MCQ from Number 451 โ 500                 Answer key: included

### Complete List of MCQ in Electronics Engineering per topic

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