## Series Circuits and Parallel Networks MCQ (Interview-Exam) Question-Answer

**Q.1** It is preferable to connect bulbs in series or in parallel?

**A.** Parallel

**B.** Both series and parallel

**C.** Series

**D.** None of the above

**Ans : **Parallel

**Q.2** Calculate the total resistance between the points A and B.

**A.** 0 ohm

**B.** 0.48 ohm

**C.** 7 ohm

**D.** 7.67 ohm

**Ans : **7.67 ohm

**Explanation: ** 1 ohm in parallel with 2 ohm give 2/3 ohm equivalent which is in series with 4 ohm and 3 ohm so total resistance between A and B = 4 + 2/3 + 3 = 23/3 = 7.67 ohm.

**Q.3** Calculate the resistance between A and B.

**A.** 7 ohm

**B.** 29.69 ohm

**C.** 3.56 ohm

**D.** 14.26 ohm

**Ans : **3.56 ohm

**Explanation: ** 1 Ohm, 2 Ohm and 3 Ohm resistors are connected in parallel. Its equivalent resistance is in series with 4 ohm resistor and parallel connection of 5 ohm and 6 ohm. The equivalent resistance of this combination is 80/11 ohms. It is parallel to 7 ohms and the equivalent resistance between A and B is 3.56 ohms.

**Q.4** Calculate the equivalent resistance between A and B.

**A.** 15 ohm

**B.** 48 ohm

**C.** 60 ohm

**D.** 12 ohm

**Ans : **12 ohm

**Explanation: ** 5 ohms and 15 ohms are added to the series to give 20 ohms.10ohm and 20 ohms are added to the series to give 30 ohms. Now both are parallel to give equivalent resistance (20ohm and 30 ohm) equivalent resistance 20*30/(20+30) = 12 ohm.

**Q.5** In a _________ circuit, the total resistance is greater than the largest resistance in the circuit.

**A.** Parallel

**B.** Neither series nor parallel

**C.** Series

**D.** Either series or parallel

**Ans : **Series

**Q.6** Batteries are generally connected in______.

**A.** Parallel

**B.** Neither series nor parallel

**C.** Series

**D.** Either series or parallel

**Ans : **Series

**Q.7** Which is the most cost efficient connection?

**A.** Parallel

**B.** Neither series nor parallel

**C.** Series

**D.** Either series or parallel

**Ans : **Series

**Q.8** In a ____________ circuit, the total resistance is smaller than the smallest resistance in the circuit.

**A.** Parallel

**B.** Neither series nor parallel

**C.** Series

**D.** Either series or parallel

**Ans : **Parallel

**Q.9** Calculate the equivalent resistance between A and B.

**A.** 46.67 ohm

**B.** 10.67 ohm

**C.** 6.67 ohm

**D.** 26.67 ohm

**Ans : **6.67 ohm

**Explanation: ** R=20||20||20=6.67 ohm. The three 20 ohm resistors are in parallel and re-sistance is measured across this terminal.

**Q.10** Calculate the equivalent resistance between A and B.

**A.** 4 ohm

**B.** 8 ohm

**C.** 2 ohm

**D.** 6 ohm

**Ans : **2 ohm

**Explanation: ** I=V/R. Total resistance R = 20+40=60ohm. V=120V. I=120/60=2A.