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71
Which of the following instruments can be used to compare the relative magnitudes of charges on two given bodies?
  • A. The electrophorous
  • B. Ebonite rod
  • C. Proof plane
  • D. Gold leaf electroscope
  • E. Capacitor
View Answer & Discuss (1) WAEC 1989
72
A short chain is usual attached to the back of a petrol tanker trailing behind it to ensure that the
  • A. petrol tanker is balanced on the wh eel
  • B. heat generated by friction in the engine can be conducted to the floor
  • C. charges generated by friction in the tanker can be conducted to the earth
  • D. the tanker moves slowly as the chain touches the floor
  • E. chain produces sound for the resonance of the tanker engine
View Answer & Discuss WAEC 1989
73
A ray of light is incidence on a plane mirror at an angle of 35o. What is the angle by the reflected ray with the surface of the mirror?
  • A. 125o
  • B. 70o
  • C. 65o
  • D. 55o
  • E. 35o
View Answer & Discuss (5) WAEC 1989
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74
The image in a pine-hole camera is always
  • A. diminished
  • B. enlarged
  • C. upright
  • D. inverted
  • E. blurred
View Answer & Discuss (2) WAEC 1989
75

The refractive index of a given transparent medium is 1.4. Which of the following is the minimum internal angle for total internal reflection to take place in the medium?

  • A. 30o
  • B. 36o
  • C. 44o
  • D. 46o
  • E. 54o
View Answer & Discuss (5) WAEC 1989
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