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Wednesday, 20 May 2026
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Physics Past Questions and Answers

Jamb 1985 Physics Questions

Question 36:
Which of the following methods CANNOT be used to produce a steel magnet? The
  • A Passing of an electric current through a solenoid
  • B Repeated stroking of the specimen with a magnet
  • C Repeated stroking of the specimen in opposite directions with magnets
  • D Heating of the specimen
  • E Hammering of the specimen in the earth's magnetic field
View Answer & Explanation
Question 37:
A cell gives a current of 0.15A through a resistance of 8\(\Omega\) and 0.3A. When the resistance is changed to 3\(\Omega\) the internal resistance of the cell is
  • A 0.05\(\Omega\)
  • B 1.00\(\Omega\)
  • C 1.50\(\Omega\)
  • D 2.00\(\Omega\)
  • E 2.50\(\Omega\)
View Answer & Explanation
Question 38:
Which of the following will convert a milliammeter to a voltmeter?
  • A Low series resistance
  • B Low parallel resistance
  • C High series resistance
  • D High parallel resistance
  • E Parallel resistance equal to milliammeter resistance
View Answer & Explanation
Question 39:
A wire P has half the diameter and half the length of a wire Q of similar material. The ratio of the resistance of P to that of Q is
  • A 8 : 1
  • B 4 : 1
  • C 2 : 1
  • D 1 : 1
  • E 1 : 4
View Answer & Explanation
Question 40:
An electric kettle, connected to a 240V mains, produces 6.0 x 105J of heat energy to boil a quantity of water in 5 minutes. Find the resistance of the kettle.
  • A 14.4\(\Omega\)
  • B 28.8\(\Omega\)
  • C 144\(\Omega\)
  • D 288\(\Omega\)
  • E 2880\(\Omega\)
View Answer & Explanation