What is the percentage of water from oceans?

  • 0
  • 0.002
  • 0.006
  • 0.97

The hardness which can be removed by boiling is called

  • permanent hardness
  • temporary hardness
  • stiffness
  • toughness

Water which forms scum with soap is called

  • hard water
  • soft water
  • distilled water
  • non distilled water

During thunderstorms, water dissolves

  • dust particles
  • HCl
  • nitric acid
  • clouds

What happens to water on cooling?

  • it expands up to 4 °C
  • it contracts up to 4 °C
  • it expands up to 2 °C
  • it contracts up to 2 °C

Hepatitis is caused by

  • virus
  • bacteria
  • amoeba
  • parasite

Temporary hardness can be removed by adding

  • lime
  • carbon
  • oxygen
  • slaked lime

Water that easily gives lather with soap is called

  • hard water
  • soft water
  • dirty water
  • clean water

Out of total the amount of water available for human use is

  • 0.003
  • 0.002
  • 0.4
  • 0.5

What is the percentage of atmospheric water?

  • 0
  • 0.002
  • 0.006
  • 0.021

Step of sewage water treatment in which some of the solids are removed as sludge is called

  • primary sewage treatment
  • secondary sewage treatment
  • activated sludge treatment
  • chlorination

The second step of sewage water treatment is called

  • primary sewage treatment
  • secondary sewage treatment
  • activated sludge treatment
  • chlorination

Process in which water is filtered through sand and gravel is called

  • sedimentation
  • coagulation
  • filtration
  • chlorination

Water exists in how many states?

  • 1
  • 2
  • 3
  • 4

How many basic steps are involved in sewage water treatment?

  • three
  • four
  • five
  • six

Which of the following is the most abundant salt in seawater?

  • magnesium chloride
  • calcium chloride
  • sodium chloride
  • sodium nitrate

Which of the following is a disease in which excess of bile from the liver enters the blood and causes yellowness of skin and eyes?

  • cholera
  • dysentery
  • jaundice
  • hepatitis

How many basic steps are involved in raw water treatment?

  • three
  • four
  • five
  • six

Natural water is

  • pure
  • impure
  • non distilled
  • distilled

Addition of washing soda removes

  • softness of water
  • temporary hardness of water
  • permanent hardness of water
  • hydrogen from water
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