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Physics 2007 WAEC Past Questions

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41
Which of the following electromagnetic wave can be detected by its heating effect?
  • A. ultraviolet radiation
  • B. x-rays
  • C. gamma rays
  • D. infrared radiation
View Answer & Discuss (2) WAEC 2007
42
If a gas is excited by high voltage to produce a discharge and the light is examined in a spectrometer
  • A. an explosion is observed
  • B. the rainbow colours are seen
  • C. an emission spectrum is observed
  • D. dark lines are observed
View Answer & Discuss (1) WAEC 2007
43
The number of protons in an element increased by one after a radioactive decay. The element must have decay by emitting
  • A. a beta particle
  • B. an alpha particle
  • C. a gamma ray
  • D. a neutron
View Answer & Discuss (1) WAEC 2007
NECO offline past questions - All questions, answers & explanations in one app 25712
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44
In a nuclear reactor, chain reactions result from the release of
  • A. electrons
  • B. photons
  • C. neutrons
  • D. protons
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45

The correct sequence of energy transformation in the operation of an x-ray tube is i. X-rays ii. Kinetic energy of thermo electrons iii. Potential energy of the target atoms iv. Heat energy of the emitted electrons

  • A. iv, iii, ii, i
  • B. ii, iv, iii, i
  • C. iv, ii, iii, i
  • D. iii, iv, ii, i
View Answer & Discuss (1) WAEC 2007
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