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Physics Past Questions and Answers

Jamb 1989 Physics Questions

Question 31:
When a radiation strikes a metal surface, electrons may be ejected from the metal. The maximum kinetic energy which may be acquired by an ejected electron depend on the
  • A Intensity of the radiation
  • B Source of the radiation
  • C Wavelength of the radiation
  • D Detection device of the electron
View Answer & Explanation
Question 32:
Which of the following is TRUE of the particles emitted in radioactive disintegration?
  • A The alpha particle is the helium nucleus H
  • B The alpha particle is lighter than the beta particle
  • C The alpha particle is deflected more than the beta particle in a magnetic field
  • D The beta particle is deflected more than the alpha particle in a magnetic field
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Question 33:
Eight alpha decays and six beta decays are necessary before an atom of 2 \(^{238}_{92}U\) achieves stability. The final product in the chain has an atomic number of
  • A 70
  • B 78
  • C 82
  • D 90
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Question 34:
An object is placed at 5.6 x 10-4m in front of a converging lens of focal length 1.0 x 10-nm. The image formed is
  • A Real, Erect and magnified
  • B Virtual, erect and magnified
  • C Real, inverted and magnified
  • D Virtual, erect and diminished
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Question 35:
The function of a 5-A fuse included in a circuit supplying a household refrigerator with power is to keep the
  • A Temperature of the refrigerator low and constant
  • B Keep current supplied to the refrigerator below 5A
  • C Voltage supply constant
  • D Current supplies to the refrigeration
View Answer & Explanation