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Physics 2009 NECO Past Questions

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36
Calculate the heat energy lost when 10g of boiling water changes to ice at 0°C. [Specific latent heat of ice 336Jg-1 . Specific heat capacity of water 4.2Jg-1 K-1]
  • A. 840J
  • B. 3360J
  • C. 3420J
  • D. 4200J
  • E. 7560J
View Answer & Discuss (3) NECO 2009
37
An effort P applied at one end of a crowbar just overcomes the resistance W at the lid of a tin. The mechanical advantage of the crowbar is expressed as
  • A. W + P
  • B. P - W
  • C. \(\frac{w}{p}\)
  • D. \(\frac{p}{w}\)
  • E. wp
View Answer & Discuss (2) NECO 2009
38
The phenomenon of photoelectric effect is used in the following EXCEPT
  • A. automatic doors
  • B. bugler alarm
  • C. electric fire alarm
  • D. sound production from film tracks
  • E. television cameras
View Answer & Discuss (2) NECO 2009
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39
Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V.
  • A. 0.02 J
  • B. 0.10 J
  • C. 0.20 J
  • D. 1.00 J
  • E. 10.00 J
View Answer & Discuss (2) NECO 2009
40
Arrange the following in the order of their increasing frequency.

I. Visible light
II. Gamma rays
III. Radio waves
IV. Infra-red radiation
V. Ultra-violet radiation
  • A. I, II, III, IV, V
  • B. II, III, IV, V, I
  • C. III, IV, V, I, II
  • D. IV, III, I. V, II
  • E. III, IV, I,V, II
View Answer & Discuss (3) NECO 2009
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