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Physics Past Questions and Answers

Topic: Resistance in series and in parallel and their combination

Jamb Physics Questions - Resistance in series and in parallel and their combination

Question 1:
Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is
  • A Less than R<sub style='font-size: smaller;'>1</sub>
  • B Greater than R<sub style='font-size: smaller;'>2</sub>
  • C The sum of R<sub style='font-size: smaller;'>1</sub> and R<sub style='font-size: smaller;'>2</sub>
  • D The difference of R<sub style='font-size: smaller;'>2</sub> and R<sub style='font-size: smaller;'>1</sub>
  • E Greater thanR<sub style='font-size: smaller;'>1</sub> but less than R<sub style='font-size: smaller;'>2</sub>
View Answer & Explanation
Question 2:
Two lamps are rated 40W and 220V each are connected in series. The total power dissipated in both lamps is
  • A 10W
  • B 20W
  • C 40W
  • D 80W
  • E None of the above
View Answer & Explanation
Question 3:
The resistance of an open series circuit is
  • A Zero
  • B Half the normal resistance of the circuit
  • C Double the normal resistance of the circuit
  • D One
  • E Infinite
View Answer & Explanation
Question 4:
Three 3ω resistance are connected in parallel what is the equivalent resistance?
  • A 1ω
  • B
  • C 3ω
  • D 0.33ω
View Answer & Explanation
Question 5:
A 35 kΩ is connected in series with a resistance of 40 kΩ. What resistance R must be connected in parallel with the combination so that the equivalent resistance is equal to 25 kΩ?
  • A 40 kΩ
  • B 37.5 kΩ
  • C 45.5 kΩ
  • D 30 kΩ
View Answer & Explanation