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Physics 1992 WAEC Past Questions

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56
When the nucleus of a uranium atom is split into two fragments of nearly equal mass the sum of the masses of the fragments is less than the mass of the original nucleus. This difference is a measure of the
  • A. experimental error in calculating the separate masses
  • B. change of momentum of each fragment
  • C. potential energy lost
  • D. nuclear energy released
  • E. kinetic energy lost
View Answer & Discuss WAEC 1992
57
A sheet of paper is placed in the path of a beam of radiations from a radioactive source. Which of the following radiations will pass through the paper?I. Alpha rays II. Beta rays III. Gamma rays
  • A. I only
  • B. II only
  • C. III only
  • D. II and III only
  • E. I, II and III
View Answer & Discuss (3) WAEC 1992
58
The process by which a metal, heated to high temperature, gives off electrons from its surface is known as
  • A. photoelectric emission
  • B. thermionic emission
  • C. radioactive emission
  • D. Held emission
  • E. secondary emission
View Answer & Discuss (1) WAEC 1992
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59
An electric string of length l is elastically stretched through a length e by a force F. The area of cross- section of the string is A and its Young’s modulus is E. Which of the following expressions is correct?
  • A. F = EA/eI
  • B. F = EAI/e
  • C. F = EAe/l
  • D. F = EAe
View Answer & Discuss (2) WAEC 1992
60

(a) Explain what is meant by the following statement. The specific latent heat of fusion of ice is \(3.4 \times 10^{5}Jkg^{-1}\).

(b) Describe an experiment to determine the specific latent heat of fusion of ice. State two precautions necessary to obtain an accurate result.

(c) Using the kinetic theory of matter, explain why ice can change to water at 0°C without any change in temperature. 

View Answer & Discuss (1) WAEC 1992
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