This is the Multiple Choice Questions Part 5 of the Series in DC Circuits as one of the Electrical Engineering topic. In Preparation for the REE 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 Electrical Engineering field, Electrical Engineering Books, Journals and other Electrical Engineering References.

#### Continue Practice Exam Test Questions Part 5 of the Series

OHMโS LAW AND ELECTRIC CIRCUITS

**Choose the letter of the best answer in each questions.**

โ MCQ in DC Circuits Part 4 | REE Board Exam

201.ย Theย hotย resistanceย ofย anย incandescentย lampย isย 10 ohms and the rated voltage is 50 V. Find the series resistance required to operate the lamp from an 80 V supply.

A.ย 8 ฮฉ

B.ย 4 ฮฉ

C.ย 6 ฮฉ

D.ย 10 ฮฉ

Answer: **Option C**

Solution:

202.ย Ohmโs law is not applicable to

A.ย copper

B.ย silver

C.ย silicon carbide

D.ย aluminum

Answer: **Option C**

Solution:

203.ย The practical unit of electrical energy is

A.ย watt

B.ย kilowatt

C.ย kilowatt-hour

D.ย megawatt

Answer: **Option C**

Solution:

204.ย A 100 watt lamp working for 20 hoursย will consume ____ units.

A.ย 200

B.ย 20

C.ย 2

D.ย 5

Answer: **Option C**

Solution:

205.ย Theย hotย resistanceย ofย anย incandescentย lampย is about ____ its cold resistance.

A.ย 10 times

B.ย 2 times

C.ย 100 times

D.ย 50 times

Answer: **Option A**

Solution:

206.ย A d.c. circuit usually has ______ as the load.

A.ย resistance

B.ย inductance

C.ย capacitance

D.ย both inductance and capacitance

Answer: **Option A**

Solution:

207.ย The purpose of load in an electric circuit is to ______.

A.ย increase the circuit current

B.ย utilize electrical energy

C.ย decrease the circuit current

D.ย none of these

Answer: **Option B**

Solution:

208.ย Electricalย appliancesย areย notย connectedย inย series because ______.

A.ย series circuit is complicated

B.ย appliances have differentย ย current rating

C.ย power loss is more

D.ย none of these

Answer: **Option B**

Solution:

209.ย Electricalย appliancesย areย connectedย inย parallel because it ______.

A.ย is a simple circuit

B.ย draws less current

C.ย results in reduce in power loss

D.ย makes the operation of appliances independent of each other

Answer: **Option D**

Solution:

210.ย Inductanceย andย capacitanceย areย notย relevantย inย a d.c. circuit because ______.

A.ย frequency of d.c. is zero

B.ย it is a simple circuit

C.ย they do not exist in a d.c. circuit

D.ย none of these

Answer: **Option A**

Solution:

211.ย Theย hotย resistanceย ofย aย 100ย watt,ย 250ย V incandescent lamp would be

A.ย 2.5 ohms

B.ย 625 ohms

C.ย 25 ohms

D.ย none of these

Answer: **Option B**

Solution:

212.ย Theย voltageย dropย acrossย 14.5ย ohmย resistorย inย Fig. 2.1 is ______.

A.ย 29 V

B.ย 14 V

C.ย 30.5 V

D.ย 18 V

Answer: **Option A**

Solution:

213.ย The circuit shown in Fig. 2.1 is called a series circuit because ______.

A.ย it contains a few resistances

B.ย itย carriesย theย sameย currentย throughoutย the circuit

C.ย it is a simple circuit

D.ย none of these

Answer: **Option B**

Solution:

214. Referringย toย Fig.ย 2.2,ย theย totalย circuitย resistanceย willย be ______.

A.ย 1000 ohms

B.ย 400 ohms

C.ย 1400 ohms

D.ย 135 ohms

Answer: **Option C**

Solution:

215.ย In Fig. 2.2 ____.

A.ย the lamp A will be brighter than lamp B

B.ย the lamp B will be brighter than lamp A

C.ย the two lamps will be equally bright

D.ย none of these

Answer: **Option B**

Solution:

216.ย Whenย aย numberย ofย resistancesย areย connectedย in parallel, the total resistance is ______.

A.ย less than the smaller resistance

B.ย greater than the smaller resistance

C.ย between the smaller and greatest resistance

D.ย none of these

Answer: **Option A**

Solution:

217.ย Twoย resistancesย ofย 6ย ohmsย andย 3ย ohmsย are connected in parallel. The total resistance is ______.

A.ย 9 ohms

B.ย 18 ohms

C.ย 0.5 ohm

D.ย 2 ohms

Answer: **Option D**

Solution:

218.ย The value of R that will give a total resistance of 1.5 ohms in Fig. 2.3 is _____.

A.ย 4 ohms

B.ย 6 ohms

C.ย 3 ohms

D.ย 9 ohms

Answer: **Option C**

Solution:

219.ย Theย currentย inย 2.5ย ohmย resistorย inย Fig.ย 2.4ย willย be ____.

A.ย 3 A

B.ย 4.5 A

C.ย 2.5 A

D.ย 2 A

Answer: **Option B**

Solution:

220.ย The current in 4.5 ohms resistor in Fig. 2.4 will be ______.

A.ย 3.5 A

B.ย 3 A

C.ย 2 A

D.ย 2.5 A

Answer: **Option D**

Solution:

221.ย Ifย 18ย resistances,ย eachย ofย valueย 36ย ohms,ย are connectedย inย parallel,ย thenย theย totalย resistanceย is ______.

A.ย 2 ohms

B.ย 54 ohms

C.ย 36 ohms

D.ย none of these

Answer: **Option A**

Solution:

222.ย Twoย incandescentย lampsย ofย 100ย W,ย 200ย Vย areย in parallelย acrossย 200ย Vย supply.ย Theย totalย resistance will be ____.

A.ย 800 ohms

B.ย 200 ohms

C.ย 400 ohms

D.ย 600 ohms

Answer: **Option B**

Solution:

223.ย The resistance across the terminals AB of the circuit shown in Fig. 2.5 is ______.

A.ย 36 ohms

B.ย 18 ohms

C.ย 9 ohms

D.ย 15 ohms

Answer: **Option C**

Solution:

224.ย Ifย aย d.c.ย supplyย ofย 180ย Vย isย connectedย across terminalsย ABย inย Fig.ย 2.5,ย thenย currentย inย 6ย ohm resistor will be ____.

A.ย 10 A

B.ย 5 A

C.ย 12 A

D.ย 6 A

Answer: **Option A**

Solution:

225.ย Theย resistanceย acrossย terminalsย ACย inย Fig.ย 2.5ย is ______.

A.ย 36 ohms

B.ย 9 ohms

C.ย 18 ohms

D.ย 8 ohms

Answer: **Option D**

Solution:

226.ย Theย resistanceย acrossย terminalsย ABย ofย theย circuit shown in Fig. 2.6 is ______.

A.ย 4 ohms

B.ย 18 ohms

C.ย 34 ohms

D.ย 8 ohms

Answer: **Option A**

Solution:

227.ย If a battery of 24 V is applied across terminals AB of the circuit shown in Fig. 2.6, then current in 2 ohm resistor will be ____.

A.ย 3 A

B.ย 6 A

C.ย 2.5 A

D.ย 1.5 A

Answer: **Option D**

Solution:

228.ย If a battery of 24 V is applied across terminals AB in Fig. 2.6, then power loss in 5 ohms resistor will be ______.

A.ย 180 W

B.ย 45 W

C.ย 90 W

D.ย 24 W

Answer: **Option B**

Solution:

229.ย Theย totalย conductanceย ofย theย circuitย shownย inย Fig. 2.7 is _____.

A.ย 13 mhos

B.ย 1.6 mhos

C.ย 6 mhos

D.ย 2.5 mhos

Answer: **Option B**

Solution:

230.ย Ifย 10ย ohmsย resistanceย isย removedย inย Fig.ย 2.7,ย then total conductance of the circuit will be _____.

A.ย 3 mhos

B.ย 6 mhos

C.ย 2 mhos

D.ย 1.5 mhos

Answer: **Option D**

Solution:

231.ย The voltage across the parallel circuit shown in Fig. 2.8 is _____.

A.ย 15 V

B.ย 10 V

C.ย 30 V

D.ย 12. 5 V

Answer: **Option A**

Solution:

232.ย The current in 10 ohms resistor in Fig. 2.8 is ______.

A.ย 3 A

B.ย 2.5 A

C.ย 1.5 A

D.ย 3.5 A

Answer: **Option C**

Solution:

233.ย Theย totalย resistanceย betweenย terminalsย 1ย andย 2ย of the circuit shown in Fig. 2.9 is _____.

A.ย 12 ohms

B.ย 2.67 ohms

C.ย 2 ohms

D.ย 64 ohms

Answer: **Option C**

Solution:

234.ย If a battery of 12 V is applied across terminals 1 and 2 of Fig. 1.9, then current through 4 ohms resistor will be _____.

A.ย 1.5 A

B.ย 3 A

C.ย 2 A

D.ย 2.5 A

Answer: **Option B**

Solution:

235.ย Theย resistanceย betweenย terminalsย 1ย andย 2ย ofย Fig. 1.10 is ______.

A.ย 12 ohms

B.ย 8 ohms

C.ย 16 ohms

D.ย 3 ohms

Answer: **Option C**

Solution:

236.ย Theย resistanceย betweenย terminalsย 1ย andย 2ย inย Fig. 1.11 is ______.

A.ย 2 ohms

B.ย 1.5 ohms

C.ย 1 ohm

D.ย 4 ohms

Answer: **Option C**

Solution:

237.ย Ifย a battery of 6 V is applied across terminals 1 and 2 in Fig. 1.11, then current in the horizontal 2 ohm resistor will be _____.

A.ย 1 A

B.ย 2 A

C.ย 3 A

D.ย 0.5 A

Answer: **Option C**

Solution:

238.ย The resistance across terminals 1 and 2 in Fig. 1.12 is ____.

A.ย 6 ohms

B.ย 12 ohms

C.ย 18 ohms

D.ย 24 ohms

Answer: **Option A**

Solution:

239.ย Twoย equalย resistancesย areย connectedย inย series across a certain supply. If the resistances are now connectedย inย parallelย acrossย theย sameย supply,ย the powerย producedย willย beย ____ย thatย ofย series connection.

A.ย two times

B.ย four times

C.ย one-half

D.ย one-fourth

Answer: **Option B**

Solution:

240.ย Referringย toย Fig.ย 1.13,ย theย resistanceย across terminals BE is _____.

A.ย 9 ohms

B.ย 18 ohms

C.ย 10 ohms

D.ย none of these

Answer: **Option A**

Solution:

241.ย Referringย toย Fig.ย 1.13,ย theย resistanceย across terminals AF is ______.

A.ย 20.5 ohms

B.ย 18 ohms

C.ย 11 ohms

D.ย none of these

Answer: **Option C**

Solution:

242.ย Referringย toย Fig.ย 1.13,ย theย currentย inย 18ย ohms resistor will be _____.

A.ย 2 A

B.ย 1.5 A

C.ย 1 A

D.ย none of these

Answer: **Option C**

Solution:

243.ย Referringย toย Fig.ย 1.13,ย theย powerย lossย inย 11ย ohms will be _____.

A.ย 11 W

B.ย 24 W

C.ย 16 W

D.ย none of these

Answer: **Option A**

Solution:

244.ย If in Fig. 1.14, switches S_{1}ย and S_{2}ย are closed, then total circuit resistance is _____.

A.ย 400 ohms

B.ย 1200 ohms

C.ย 1000 ohms

D.ย 2400 ohms

Answer: **Option B**

Solution:

245.ย If switch S_{1}ย is open and switch S_{2ย } is closed in Fig. 1.14, then circuit resistance will be _____.

A.ย 1200 ohms

B.ย 1000 ohms

C.ย 1400 ohms

D.ย 2400 ohms

Answer: **Option C**

Solution:

246.ย If in Fig. 1.14, both switches S_{1}ย and S_{2}ย are closed, then _____.

A.ย L_{1} will be brighter than L_{2} or L_{3}

B.ย L_{1} will be dimmer than L_{2} or L_{3}

C.ย L_{1} will be as bright as L_{2} or L_{3}

D.ย none of these

Answer: **Option A**

Solution:

247.ย Ifย inย Fig.ย 1.14ย switchesย S1ย andย S2ย areย open,ย then lamp L_{1} will give output ______.

A.ย less than 40 W

B.ย more than 40 W

C.ย equal to 40 W

D.ย none of these

Answer: **Option D**

Solution:

248.ย If in Fig. 1.14 switches S1 and S2 are closed and the supply voltage is increased to 400 V, then _____.

A.ย lamp L_{1} will burn out

B.ย lamp L_{2} will burn out

C.ย both lamps L_{2} and L_{3} will burn out

D.ย all the lamps will be safe

Answer: **Option A**

Solution:

249.ย Ifย inย Fig.ย 1.1,ย resistorย R_{2}ย becomesย open-circuited, the reading of the voltmeter will become

A.ย zero

B.ย 150 V

C.ย 50 V

D.ย 200 V

Answer: **Option D**

Solution:

250.ย Whatever the battery voltage in Fig. 1.2, it is certain thatย smallestย currentย willย flowย inย theย resistanceย of _____ ohm.

A.ย 300

B.ย 500

C.ย 200

D.ย 100

Answer: **Option A**

Solution:

โ MCQ in DC Circuits Part 6 | REE Board Exam

#### Questions and Answers in DC Circuits

Following is the list of practice exam test questions in this brand new series:

**MCQ in DC Circuits**

**MCQ from Number 1 โ 50**Answer key:

**included**

**MCQ from Number 51 โ 100**Answer key:

**included**

**MCQ from Number 101 โ 150**Answer key:

**included**

**MCQ from Number 151 โ 200**Answer key:

**included**

**MCQ from Number 201 โ 250**Answer key:

**included**

**MCQ from Number 251 โ 300**Answer key:

**included**

**MCQ from Number 301 โ 350**Answer key:

**included**

**MCQ from Number 351 โ 400**Answer key:

**included**

**MCQ from Number 401 โ 450**Answer key:

**included**

**MCQ from Number 451 โ 500**Answer key:

**included**

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