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Sunday, 01 November 2026
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Physics Past Questions and Answers

Jamb 1989 Physics Questions

Question 26:
The resistance of a 5m uniform wire of cross-sectional area 0.2 x 10-6m2 is 0.425. What is the resistivity of the material of the wire?
  • A 1.10 x 10<sup style='font-size: smaller;'>-6</sup>\(\Omega\)m
  • B 4.25 x 10<sup style='font-size: smaller;'>-6</sup>\(\Omega\)m
  • C 2.40 x 10<sup style='font-size: smaller;'>-7</sup>\(\Omega\)m
  • D 1.70 x 10<sup style='font-size: smaller;'>-8</sup>\(\Omega\)m
View Answer & Explanation
Question 27:
Three resistors, with substances 250\(\Omega\), 500\(\Omega\) and 1k\(\Omega\) are connected in series. A 6V battery is connected to either end of the combination. Calculate the pot3ential difference between the end of the 250\(\Omega\) resistor.
  • A 0.20V
  • B 0.86V
  • C 1.71V
  • D 3.43V
View Answer & Explanation
Question 28:
A calibrated potentiometer is used to measure the e.m.f. of a cell because the
  • A Internal resistance of a cell is small compared with that of the potentiometer
  • B Potentiometer has a linear scale
  • C Potentiometer takes no current from the cell
  • D Resistance of the potentiometer is less than that of a voltmeter
View Answer & Explanation
Question 29:
An ammeter of resistance 1.0\(\Omega\) has a full-scale deflection of 50mA. Determine the resultant full-scale deflection of the meter when a shunt of 0.0111\(\Omega\) is connected across its terminals.
  • A 400mA
  • B 450mA
  • C 500mA
  • D 550mA
View Answer & Explanation
Question 30:
The electrochemical equivalent of silver is 0.0012gC-1. If 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5.0mins, the current must be
  • A 6000A
  • B 100A
  • C 10A
  • D 1A
View Answer & Explanation