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Physics 1989 JAMB Past Questions

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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 10-6\(\Omega\)m
  • B. 4.25 x 10-6\(\Omega\)m
  • C. 2.40 x 10-7\(\Omega\)m
  • D. 1.70 x 10-8\(\Omega\)m
View Answer & Discuss (13) JAMB 1989
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 & Discuss (5) JAMB 1989
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 & Discuss (7) JAMB 1989
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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 & Discuss (19) JAMB 1989
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 & Discuss JAMB 1989
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts