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2841
A screw-jack has the distance between its successive threads as P and the length of its tommy bar as r. Its velocity ratio is given by the expression
  • A. \(\frac{2 \pi r^2}{P}\)
  • B. \(\frac{2 \pi r}{P}\)
  • C. \(\frac{2 \pi}{rp}\)
  • D. \(\frac{P}{2 \pi r}\)
View Answer & Discuss WAEC 2014
2842

Heat transfer by conduction is similar to wave motion because

  • A. there is increase in temperature
  • B. transfer of materials is involved
  • C. charged particles vibrates at right angles
  • D. no transfer of materials is involved
View Answer & Discuss (3) WAEC 2014
2843

The temperature at which the water vapor in the air saturates the air and begins to condense is known as

  • A. dew point
  • B. critical point
  • C. boiling point
  • D. triple point
View Answer & Discuss WAEC 2014
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2844

The change of state from solid to liquid occurs

  • A. at constant temperature
  • B. when temperature is lower than the boiling point
  • C. when temperature is just near freezing point
  • D. when temperature is equal to the boiling point
View Answer & Discuss (2) WAEC 2014
2845

Which of the following types of thermometers can be used to measure a range of temperature from -50°C to 50°? i. Clinical ii. Mercury iii. Alcohol-in-glass

  • A. i only
  • B. ii only
  • C. iii only
  • D. i and ii only
View Answer & Discuss WAEC 2014
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