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Thursday, 29 October 2026
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Physics Past Questions and Answers

Jamb 2004 Physics Questions

Question 16:
If 16mA of current flows through a conductor in one second, the number of electron transported per seconds is
[1 electronic charge = 1.6 x 10-19C]
  • A 1.00 x 10<sup style='font-size: smaller;'>20</sup>
  • B 2.56 x 10<sup style='font-size: smaller;'>-18</sup>
  • C 2.56 x <sup style='font-size: smaller;'>-17</sup>
  • D 1.00 x 10<sup style='font-size: smaller;'>17</sup>
View Answer & Explanation
Question 17:
Electrical appliances at home are normally earthed so that
  • A The appliances are maintained at a lower p.d than the earth
  • B Both the a.c and d.c sources can be used
  • C A person touching the appliances is safe from electric shock
  • D The appliances are maintained at a higher p.d than the earth
View Answer & Explanation
Question 18:
Given three capacitors 0.3μF, 0.5μF and 0.2μF, the joint capacitance when arranged to give minimum capacitance is
  • A 0.1μF
  • B 0.3μF
  • C 1.0μF
  • D 0.5μF
View Answer & Explanation
Question 19:
The difference between X-rays and gamma rays is that
  • A X-rays are more penetrating than gamma rays
  • B X-rays are electromagnetic radiations while gamma rays are negatively charged radiation
  • C X-rays have higher frequencies than gamma rays
  • D X-rays arise from energy changes in the electronic structure of atoms while gamma rays come from the nucleus
View Answer & Explanation
Question 20:
To protect a material from the influnce of an external magnetic field, the materials should be kept
  • A Square steel ring
  • B Triangular zinc ring
  • C Soft iron ring
  • D Loop of copper wire
View Answer & Explanation