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861
Which of the following reasons explains why the walls and ceilings of a standard concert hall are usually covered with perforated pads? To
  • A. increase the intensity of sound waves
  • B. increases the loudness of the sound waves
  • C. reduce the effect of revibration of sound waves
  • D. decreases thr frequency of sound waves
View Answer & Discuss WAEC 2004
862
The sound from a vibrating tuning sound is when the tip of its stem is placed on a wooden table than when in air because
  • A. the friction between the table and the tuning fork generates additional energy
  • B. air molecules obsorb sound wave but wood transmit sound waves
  • C. the table increases the frequency of the turning fork
  • D. a large mass of air is set into vibration by the table
View Answer & Discuss (2) WAEC 2004
863
Charges on a conductor are
  • A. evenly distributed over a surface of any shape
  • B. concentrate on the inner surface of the conductor
  • C. concentrate at the outer flat surface of the conductor
  • D. generally concentrated at sharply curved surface
View Answer & Discuss WAEC 2004
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864
Which of following functions is performed by manganese IV oxide in the Lenclanche cell?
  • A. control of local action
  • B. depolarisation of the cell
  • C. regulating current flow in the cell
  • D. reduction of the internal resistance of the cell
View Answer & Discuss (1) WAEC 2004
865
A car fuse marked 3A operates optimally on a 12V battery, calculate the resistance of the fuse
  • A. 36.0\(\Omega\)
  • B. 15.0\(\Omega\)
  • C. 9.0\(\Omega\)
  • D. 4.0\(\Omega\)
View Answer & Discuss (1) WAEC 2004
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