Multiple Choice Questions Topic Outline
- 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
The Six-Parts Series
Following is the list of multiple choice questions in this brand new series:
Start with Part V of the MCQs Series
201. Core materials of a good relay have _________ hysteresis loop.
- A. large
- B. narrow
- C. very large
- D. very narrow
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
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
204. There are how many compounds available in nature?
- A. 105
- B. 1000
- C. 300,000
- D. Unlimited
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
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
207. __________ is a substance of whose molecules consist of the same kind of atom.
- A. Mixture
- B. Compound
- C. Element
- D. Isotope
208. Hipernik is an alloy containing __________ iron and __________ nickel.
- A. 40% ; 60%
- B. 60% ; 40%
- C. 50% ; 50%
- D. 70% ; 30%
209. The mass of proton is __________ the mass of an electron.
- A. equal to
- B. about 1837 times
- C. less than
- D. 200 times
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
211. The electrons in the last orbit of an atom are called _______ electrons.
- A. free
- B. valence
- C. bound
- D. thermionic
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
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
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
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
216. One coulomb of charge consists of ________ electrons.
- A. 624 × 1016
- B. 62.4 × 1016
- C. 6.24 × 1016
- D. 0.624 × 1016
217. A one cubic cm of copper has how many free electrons at room temperature?
- A. 80 × 1018
- B. 8.5 × 1022
- C. 20 × 1010
- D. 50 × 1020
218. Electronic current in a wire is the flow of ____________ electrons.
- A. free
- B. valence
- C. bound
- D. loose
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
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
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
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
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
224. The resistivity of a conductor ___________ with an increase in temperature.
- A. increases
- B. decreases
- C. remains the same
- D. becomes zero
225. What is the SI unit of conductance?
- A. Siemens
- B. Mhos
- C. Ohms
- D. 1/Ohms
226. If the resistance of a material 2 m long and 2 m2 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
227. What is the SI unit of conductivity?
- A. Ohms/m
- B. Ohms-m
- C. Siemens-m
- D. Siemens/m
228. The temperature coefficient of resistance of conductors is
- A. positive
- B. zero
- C. negative
- D. infinite
229. The temperature coefficient of resistance of semiconductors is
- A. positive
- B. zero
- C. negative
- D. infinite
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
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
232. The temperature coefficient of resistance of insulators is
- A. zero
- B. negative
- C. positive
- D. infinite
233. The temperature coefficient of resistance of eureka is
- A. positive
- B. negative
- C. almost zero
- D. infinite
234. If the value of α0 a conductor is 1/234 per oC, then the value of α18 is
- A. 1/218 per oC
- B. 1/252 per oC
- C. 1/272 per oC
- D. 1/273 per oC
235. If the value of α25 a conductor is 1/255 per oC, then the value of α20 is
- A. 1/300 per oC
- B. 1/250 per oC
- C. 1/230 per oC
- D. 1/260 per oC
236. If the value of α25 of a conductor is 1/230 per oC, then the value of α0 is
- A. 1/180 per oC
- B. 1/150 per oC
- C. 1/280 per oC
- D. 1/230 per oC
237. Ohm’s law cannot be applied to which material?
- A. Copper
- B. Silver
- C. Silicon carbide
- D. Aluminum
238. What is the practical unit of electrical energy?
- A. Watt
- B. Kilowatt-hour
- C. Kilowatt-second
- D. Megawat-hour
239. A 200-watt lamp working for 24 hours will consume approximately _____ units.
- A. 50
- B. 5
- C. 24
- D. 0.5
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
241. Under ordinary conditions, a body is considered
- A. positively charged
- B. neutral
- C. negatively charged
- D. stable
242. A positively charged body has
- A. deficit of electrons
- B. excess of neutrons
- C. excess of electrons
- D. deficit of protons
243. A negatively charge body has
- A. deficit of electrons
- B. excess of protons
- C. excess of electrons
- D. deficit of neutrons
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
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
246. What is the relative permittivity of air?
- A. 0
- B. 1
- C. 8.854 × 10-12
- D. 4π × 10-7
247. If two similar charges 1 coulomb each are placed 1 m apart in air, then the force of repulsion is
- A.8 × 106 N
- B. 9 × 109 N
- C. 106 N
- D. 5 × 106 N
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
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
250. What is another name for relative permittivity?
- A. Dielectric strength
- B. Electric intensity
- C. Potential gradient
- D. Dielectric constant
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