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Physics 1990 WAEC Past Questions

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56
A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours?
  • A. 1/32
  • B. 1/16
  • C. 1/8
  • D. 1/4
  • E. 1/2
View Answer & Discuss (1) WAEC 1990
57
A metal is illuminated with a radiation of energy 6.88eV If the kinetic energy of the emitted electrons is 1.5OeV, calculate the work function of the metal.
  • A. 0.22eV
  • B. 4.59eV
  • C. 5.38eV
  • D. 8.38eV
  • E. 10.32eV
View Answer & Discuss WAEC 1990
58
Viscosity in a liquid does not depend on the
  • A. nature of the liquid
  • B. relative velocity between the liquid layers
  • C. area of the surfaces in contact
  • D. temperature of the liquid
  • E. normal reaction between the liquid layers
View Answer & Discuss (2) WAEC 1990
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59

Which of the following is not crystal?

  • A. Sodium chloride
  • B. Lead
  • C. Copper (II) tetraoxosulphate (VI)
  • D. Glass
  • E. Germanium
View Answer & Discuss (7) WAEC 1990
60
What is the difference between a crystalline and an amorphous solid? A crystalline solid
  • A. has cubic structure while amorphous solid has hexagonal structure
  • B. has regularly-repeating pattern while an amorphous solid has not
  • C. is white while amorphous solid is yellow
  • D. is always hard while amorphous solid is always soft
  • E. melts on heating while an amorphous solid sublimates on heating.
View Answer & Discuss (4) WAEC 1990
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