286 . The highest point on road surface is called

  • A. crown
  • B. camber
  • C. gradient
  • D. beam
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287 . By boiling water, hardness can be removed if it is due to

  • A. calcium sulphate
  • B. magnesium sulphate
  • C. calcium nitrate
  • D. calcium bicarbonate
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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288 . Sunlight

  • A. helps growth of bacterias
  • B. impedes growth of algae
  • C. increases dissolved oxygen content
  • D. reduces turbidity.
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290 . Aeration of water is done to remove

  • A. odour
  • B. colour
  • C. bacterias
  • D. hardness
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291 . Sewerage system is designed for

  • A. maximum flow only
  • B. minimum flow only
  • C. average flow only
  • D. maximum and minimum flow
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292 . Dissolved oxygen in streams is

  • A. maximum at noon
  • B. minimum at noon
  • C. maximum at midnight
  • D. same throughout the day
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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293 . An instantaneous change in voltage is not possible in a/an

  • A. resistor
  • B. inductor
  • C. capacitor
  • D. current source
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295 . Surface energy per unit area of a surface is numerically equal to

  • A. atmospheric pressure
  • B. surface tension
  • C. force of adhesion
  • D. force of cohesion
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296 . Metacentric height is given as the distance between

  • A. the center of gravity of the body and the meta center
  • B. the center of gravity of the body and the center of buoyancy
  • C. the center of gravity of the body and the center of pressure
  • D. center of buoyancy and metacenter.
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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298 . Pure iron is the structure of

  • A. ferrite
  • B. pearlite
  • C. anstenite
  • D. ferrite and cementite
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299 . The metallic structure of mild steel is

  • A. body centred cubic
  • B. face centred cubic
  • C. hexagonal close packed
  • D. cubic structure
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