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Wednesday, 15 April 2026
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Physics Past Questions and Answers

Topic: Conversion of galvanometers to ammeters and voltmeter using shunts and multipliers

Jamb Physics Questions - Conversion of galvanometers to ammeters and voltmeter using shunts and multipliers

Question 1:
The value of the series resistor required to convert the above galvanometer into a voltmeter with a full range deflection of 15V is
  • A 985 ohms
  • B 990 ohms
  • C 995 ohms
  • D 1000 ohms
  • E 1005 ohms
View Answer & Explanation
Question 2:
A galvanometer of resistance 5.0W has full-scale deflection for a current of 100mA. How would its range be extended to 1.0A? By placing a resistance of
  • A \(\frac{5}{9}\)\(\Omega\) in parallel
  • B \(\frac{9}{5}\)\(\Omega\) in series
  • C 45\(\Omega\) in parallel
  • D 45\(\Omega\) in series
  • E \(\frac{9}{5}\)\(\Omega\) in parallel
View Answer & Explanation
Question 3:
A moving coil galvanometer of 300\(\Omega\) resistance gives full scale deflection for 1.0mA. The resistance R, of the shunt that is required to convert the galvanometer into a 3.0A ammeter is
  • A 899.70\(\Omega\)
  • B 10.00\(\Omega\)
  • C 0.10\(\Omega\)
  • D 0.01\(\Omega\)
View Answer & Explanation
Question 4:
An ammeter of resistance 5Ω has a full-scale deflection when a current of 50 mA flows in it. The value of the resistor required to adapt it to measure a current of 5 A is?
  • A 0.25Ω
  • B 5.00Ω
  • C 19.80Ω
  • D 0.05Ω
View Answer & Explanation
Question 5:
A galvanometer with full-scale deflection of 10 mA is to be converted to a voltmeter with full-scale deflection of 5v. the resistance of the galvanometer is
  • A 1Ω
  • B 2Ω
  • C 5Ω
  • D 10Ω
View Answer & Explanation