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Sunday, 21 June 2026
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Physics Past Questions and Answers

Topic: Current Electricity

Jamb Physics Questions - Current Electricity

Question 11:
A milliameter of resistance 5\(\Omega\) and full scale deflection of 5m A is to used to measure a potential difference of 50 V. The resistance of the multiplier should be
  • A 95\(\Omega\)
  • B 110\(\Omega\)
  • C 595\(\Omega\)
  • D 995\(\Omega\)
  • E 1005\(\Omega\)
View Answer & Explanation
Question 12:
A cell has an open circuit voltage V1 and a closed circuit voltage V2 when a current is flowing through it. Therefore, the internal resistance of the cell is
  • A \(\frac{V_2}{I}\)
  • B \(\frac{V_1}{I}\)
  • C \(\frac{(V_1 + V_2)}{I}\)
  • D \(\frac{(V_1 - V_2)}{I}\)
  • E \(\frac{(V_2 - V_1)}{I}\)
View Answer & Explanation
Question 13:
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 14:
A high-resistance voltmeter reads 3.0V when connected across the terminals of a battery on open circuit and 2.6V when the battery supplies a current of 0.2A through a lamp. The resistance of lamp is
  • A 2.00\(\Omega\)
  • B 13.00\(\Omega\)
  • C 0.52\(\Omega\)
  • D 0.13\(\Omega\)
  • E 1.50\(\Omega\)
View Answer & Explanation
Question 15:
A milliameter with full scale deflection of 10mA has an internal resistance of 5 ohms. It would be converted to an ammeter with a full scale deflection of 1A by connecting a resistance of
  • A \(\frac{5}{99}\)ohms in series with it
  • B \(\frac{5}{99}\)ohms in parallel with it
  • C \(\frac{99}{5}\)ohms in series with it
  • D \(\frac{99}{5}\)ohms in parallel with it
  • E 2 ohms in series with it
View Answer & Explanation