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Physics 1998 WAEC Past Questions

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31
A lantern gives an image of 3m square of a slide 7.62cm square on a screen. If the screen is 10m from the projection lens of the lantern, calculate the focal length of the lens
  • A. 40.3cm
  • B. 26.1cm
  • C. 24.8cm
  • D. 0.7cm
  • E. 0.3cm
View Answer & Discuss WAEC 1998
32
The intensity of light falling on the film in a camera depend on the i. brightness of the object. ii. diameter of the aperture stop. iii. speed of the shutter. Which of the statements is/are correct/
  • A. i, ii and iii
  • B. i and ii only
  • C. i and ii only
  • D. ii and iii only
  • E. iii only
View Answer & Discuss (3) WAEC 1998
33
the shortest length of the air column in a resonance tube at resonance is 0.12m and the next resonance length is 0.37m. calculate the frequency of vibration given that the speed of sound in air is 340m-1
  • A. 1360Hz
  • B. 694Hz
  • C. 680Hz
  • D. 34Hz
  • E. 340Hz
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34
A sonometer wire under a tension of N10N, produces a frequency of 250Hz when plucked. Keeping the length of the wire constant, the tension is adjusted to produce a new frequency of 350Hz. Calculate the new tension
  • A. 39.2N
  • B. 19.6N
  • C. 14.2N
  • D. 7.4N
  • E. 5.1N
View Answer & Discuss WAEC 1998
35
Calculate he wavelength of a note which is one octave lower than a note of 256Hz in a medium in which the speed of sound is 352ms-1
  • A. 0.69m
  • B. 1.38m
  • C. 2.75m
  • D. 5.50m
  • E. 9.30m
View Answer & Discuss (5) WAEC 1998
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709