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901
Which of the following statements is correct?
  • A. the density of a liquid decreases when it expands
  • B. the density of a liquid increases when the liquids are heated
  • C. the real expansivity of a liquid is less than its apparent expansivity
  • D. a liquid changes to solid when heated to a sufficiently high temperature
View Answer & Discuss (1) WAEC 2005
902
The pressure exerted by a given mass of gas in a container
  • A. decreases if the container is heated
  • B. increases if the molecules of the gas move faster
  • C. increases if the container is doubled
  • D. decreases as the kinetic energy of the gas molecules inceases
View Answer & Discuss WAEC 2005
903
Which of the following statements about a progressive mechanical wave is correct?
  • A. it can be a plane polarised
  • B. its energy is localised at specific points of its profile
  • C. it does not require a material medium for its propagation
  • D. its frequency remains constant as it travels between different media
View Answer & Discuss (1) WAEC 2005
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904
The distance between two points in phase on a progressive wave is 5cm. If the sped of the wave is 0.2ms-1, calculate its period
  • A. 4.00s
  • B. 2.50s
  • C. 0.25s
  • D. 0.04s
View Answer & Discuss (2) WAEC 2005
905
Radio waves travel in air at 3.0 x 108ms-1. If the waves enter water of refractive index \(\frac{4}{3}\), calculate the speed of radio waves in water
  • A. 4.33 x 108ms-1
  • B. 4.00 x 108ms-1
  • C. 2.25 x 108ms-1
  • D. 1.33 x 108ms-1
View Answer & Discuss (5) WAEC 2005
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