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Physics Past Questions and Answers

Topic: Simple voltaic cell and its defects

Jamb Physics Questions - Simple voltaic cell and its defects

Question 1:
A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the cell is
  • A 12.0%
  • B 25.0%
  • C 33.3%
  • D 75.0%
View Answer & Explanation
Question 2:
When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to two-third of its normal value. The internal resistance of the cell is
  • A \(\frac{2}{1}\)R
  • B \(\frac{1}{2}\)R
  • C \(\frac{3}{2}\)R
  • D 5R
View Answer & Explanation
Question 3:
A simple cell with mercury-amalgamated zinc electrode prevents
  • A Local actions
  • B Polarization
  • C Buckling
  • D Degradation
View Answer & Explanation
Question 4:
Which of the following can be used to reduce local action in a Laclanche cell?
  • A A carbon rod as the positive pole
  • B Pure zinc as the negative pole
  • C Potassium permanganate solution in contact with the positive pole
  • D Common salt solution
View Answer & Explanation
Question 5:
In the diagram above, if the internal resistance of the cell is zero, the ration of the powers P1 and P2 dissipated by R1 and R2
  • A <sup style='font-size: smaller;'>R<sub style='font-size: smaller;'>2</sub></sup>/<sub style='font-size: smaller;'>R1</sub>
  • B <sup style='font-size: smaller;'>R<sub style='font-size: smaller;'>1</sub></sup>/<sub style='font-size: smaller;'>R2</sub>
  • C <sup style='font-size: smaller;'>R<sub style='font-size: smaller;'>1</sub>+R<sub style='font-size: smaller;'>2</sub></sup>/<sub style='font-size: smaller;'>R1</sub>
  • D <sup style='font-size: smaller;'>R<sub style='font-size: smaller;'>1</sub>+R<sub style='font-size: smaller;'>2</sub></sup>/<sub style='font-size: smaller;'>R2</sub>
View Answer & Explanation