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Physics 1997 WAEC Past Questions

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36

An alternating current with a peak value of 5A passes through a resistor of resistance 10Ω. Calculate the rate at which energy is dissipated in the resistor

  • A. 250W
  • B. 125W
  • C. 50W
  • D. 35.4W
  • E. 12.5W
View Answer & Discuss (6) WAEC 1997
37
The invisible part of the spectrum of a white light consists of the following colors
  • A. Red, orange and yellow only
  • B. Infra-red, ultraviolet and blue only
  • C. Indigo and green only
  • D. Violet and red only
  • E. Ultra violet and infra-red only
View Answer & Discuss (1) WAEC 1997
38
Which of the following is not true of the similarities between a camera and the human eye?
  • A. Both the camera and the human eye have light proof interiors
  • B. Both the camera and the human eye have light sensitive screens
  • C. Inverted images are formed on the screen in both
  • D. The distance between the lens and the screen is fixed in both
  • E. The amount of light entering both the eye and the camera can be adjusted
View Answer & Discuss (1) WAEC 1997
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39

The magnification produced with a converging lens is 5. If the object is a square wire gauze of side 2cm, calculate the area of the image

  • A. 100\(cm^2\)
  • B. 40\(cm^2\)
  • C. 20\(cm^2\)
  • D. 10\(cm^2\)
  • E. 4\(cm^3\)
View Answer & Discuss (9) WAEC 1997
40
A magnet is being inserted into a coil of wire. On which of the following factors does the induced e.m.f in the coil depend? I. Number of turns in the coil II. Strength of the coil III. Speed with which magnet is inserted into the coil.
  • A. I only
  • B. II only
  • C. III only
  • D. I and II only
  • E. I, II,III only
View Answer & Discuss (3) WAEC 1997
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