R4RIN – MCQs, Mock Tests | CBES Board Class 10 ENVIRONMENTAL CHEMISTRY II WATER MCQS

The ratio of hydrogen (H) and oxygen (O) in water molecule by volume is

1. 0.084027778
2. 0.043055556
3. 0.125694444
4. 0.167361111

✅ Correct Answer: 1

What is the fourth step of raw water treatment?

1. sedimentation
2. coagulation
3. filtration
4. chlorination

✅ Correct Answer: 4

The hardness that cannot be removed by boiling is called

1. temporary hardness
2. permanent hardness
3. semi temporary hardness
4. semi permanent hardness

✅ Correct Answer: 2

The density of water becomes maximum at 5 °C 12 °C

1. 10 °C
2. 4 °C
3. 5 °C
4. 12 °C

✅ Correct Answer: 2

Step of sewage water treatment in which sewage is placed in tanks and aerated with large blowers is called

1. primary sewage treatment
2. secondary sewage treatment
3. activated sludge treatment
4. chlorination

✅ Correct Answer: 3

What percentage of fresh water is available to man?

1. 0.2
2. 0.02
3. 0.002
4. 0.0002

✅ Correct Answer: 3

What is the second step of raw water treatment?

1. sedimentation
2. coagulation
3. filtration
4. chlorination

✅ Correct Answer: 2

What is the percentage of water from rivers and lakes?

1. 0
2. 0.002
3. 0.006
4. 0.021

✅ Correct Answer: 2

Permanent hardness of water is caused due to the presence of dissolved

1. calcium hydrogen carbonates
2. magnesium hydrogen carbonates
3. chlorides of magnesium
4. Sulphates of magnesium

✅ Correct Answer: 4

Step of sewage water treatment in which there are some aeration and organic material is converted to inorganic materials is called

1. primary sewage treatment
2. secondary sewage treatment
3. activated sludge treatment
4. chlorination

✅ Correct Answer: 2

Temporary hardness of water is caused due to the presence of dissolved

1. calcium hydrogen carbonates only
2. magnesium hydrogen carbonates only
3. Sulphates and chlorides of calcium or magnesium
4. calcium hydrogen carbonates and magnesium hydrogen carbonates

✅ Correct Answer: 4

Which of the following is an intestinal disease caused by bacteria such as E.coli?

1. cholera
2. dysentery
3. jaundice
4. hepatitis

✅ Correct Answer: 1

What is the percentage of groundwater?

1. 0
2. 0.002
3. 0.006
4. 0.021

✅ Correct Answer: 3

Which type of Hepatitis spreads through polluted water?

1. hepatitis A only
2. hepatitis B only
3. hepatitis C
4. hepatitis A and B

✅ Correct Answer: 4

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

1. magnesium chloride
2. calcium chloride
3. sodium chloride
4. sodium nitrate

✅ Correct Answer: 3

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?

1. Cholera
2. dysentery
3. jaundice
4. hepatitis

✅ Correct Answer: 3

Property due to which water acts as a universal solvent is its

1. polarity only
2. ability to make hydrogen bond only
3. strong dipole dipole interaction
4. polarity and ability to make hydrogen bond

✅ Correct Answer: 4

What is the first step of raw water treatment?

1. sedimentation
2. coagulation
3. filtration
4. chlorination

✅ Correct Answer: 1

The fourth step of sewage water treatment is called

1. primary sewage treatment
2. secondary sewage treatment
3. activated sludge treatment
4. chlorination

✅ Correct Answer: 4

Water exists in how many states?

1. 1
2. 2
3. 3
4. 4

✅ Correct Answer: 3

How many basic steps are involved in sewage water treatment?

1. three
2. four
3. five
4. six

✅ Correct Answer: 2

What is the percentage of water from glaciers and ice caps?

1. 0 0.
2. 002 0
3. .006
4. 0.021

✅ Correct Answer: 4

What is the third step of raw water treatment?

1. sedimentation
2. coagulation
3. filtration
4. chlorination

✅ Correct Answer: 3

Which of the following is a dangerous intestinal disease that spreads by polluted water containing bacteria?

1. typhoid
2. dysentery
3. amoeba
4. hepatitis

✅ Correct Answer: 1

What happens to water on cooling?

1. it expands up to 4 °C
2. it contracts up to 4 °C
3. it expands up to 2 °C
4. it contracts up to 2 °C

✅ Correct Answer: 2

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

1. 0.003
2. 0.002
3. 0.4
4. 0.5

✅ Correct Answer: 2

What is the percentage of atmospheric water?

1. 0 0.
2. 002
3. 0.006
4. 0.021

✅ Correct Answer: 1

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

1. primary sewage treatment
2. secondary sewage treatment
3. activated sludge treatment
4. chlorination

✅ Correct Answer: 1

The second step of sewage water treatment is called

1. primary sewage treatment
2. secondary sewage treatment
3. activated sludge treatment
4. chlorination

✅ Correct Answer: 1

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

1. sedimentation
2. coagulation
3. filtration
4. chlorination

✅ Correct Answer: 3

How many basic steps are involved in raw water treatment?

1. three
2. four
3. five
4. six

✅ Correct Answer: 2

Natural water is

1. pure
2. impure
3. non distilled
4. distilled

✅ Correct Answer: 2

Addition of washing soda removes

1. softness of water
2. temporary hardness of water
3. permanent hardness of water
4. hydrogen from water

✅ Correct Answer: 3

The first step of sewage water treatment is called

1. primary sewage treatment
2. secondary sewage treatment
3. activated sludge treatment
4. chlorination

✅ Correct Answer: 1

Water which forms scum with soap is called

1. hard water
2. soft water
3. distilled water
4. non distilled water

✅ Correct Answer: 1

During thunderstorms, water dissolves

1. dust particles
2. HCl
3. nitric acid
4. clouds

✅ Correct Answer: 3

Hepatitis is caused by

1. virus
2. bacteria
3. amoeba
4. parasite

✅ Correct Answer: 1

Temporary hardness can be removed by adding

1. lime
2. carbon
3. oxygen
4. slaked lime

✅ Correct Answer: 4

Water that easily gives lather with soap is called

1. hard water
2. soft water
3. dirty water
4. clean water

✅ Correct Answer: 1

The third step of sewage water treatment is called

1. primary sewage treatment
2. secondary sewage treatment
3. activated sludge treatment
4. chlorination

✅ Correct Answer: 3

Water that gives little lather is called

1. hard water
2. soft water
3. dirty water
4. clean water

✅ Correct Answer: 2

Water exists in how many different states on Earth?

1. one
2. two
3. three
4. four

✅ Correct Answer: 3

What is the percentage of water from oceans?

1. 0
2. 0.002
3. 0.006
4. 0.97

✅ Correct Answer: 4

The hardness which can be removed by boiling is called

1. permanent hardness
2. temporary hardness
3. stiffness
4. toughness

✅ Correct Answer: 2

What percentage of sodium chloride is present in seawater?

1. 0.02
2. 0.1
3. 0.034
4. 0.01

✅ Correct Answer: 3

Which of the following is an intestinal disease caused by a parasite, entamoeba?

1. cholera
2. dysentery
3. jaundice
4. hepatitis

✅ Correct Answer: 2

What is given when electricity is passed through acidified water in a voltammeter?

1. oxygen only
2. hydrogen only
3. nitrogen
4. oxygen and hydrogen

✅ Correct Answer: 4

Which of the following is transmitted by fecal contamination of water or food by an encysted organism?

1. primary sewage treatment
2. secondary sewage treatment
3. activated sludge treatment
4. chlorination

✅ Correct Answer: 2

Which of the following is a disease that proceeds from obstruction of the liver?

1. cholera
2. dysentery
3. jaundice
4. hepatitis

✅ Correct Answer: 3

How much percentage of the Earth's crust is covered by water?

1. 0.69
2. 0.71
3. 0.8
4. 0.75

✅ Correct Answer: 2

Hard water can block radiators due to the formation of

1. insoluble calcium and magnesium salts
2. insoluble sodium salts
3. insoluble phosphate salts
4. insoluble potassium salts

✅ Correct Answer: 1

What is the total amount of water present on Earth?

1. 1.33 billion cubic kilometers
2. 1.33 billion cubic meters
3. 1.33 million cubic kilometers
4. 1.33 million cubic meters

✅ Correct Answer: 1

Ice floats on top of the water because

1. water expands on freezing
2. water contracts on freezing
3. ice is lighter than water
4. none of above

✅ Correct Answer: 1

Process in which water is allowed to stand in a reservoir is called

1. sedimentation
2. coagulation
3. filtration
4. chlorination

✅ Correct Answer: 1

Which of the following is an acute inflammation of the liver?

1. cholera
2. dysentery
3. jaundice
4. hepatitis

✅ Correct Answer: 4

Water in swimming pools is purified by adding sodium chlorine phosphorus potassium

1. sodium
2. chlorine
3. phosphorus
4. potassium

✅ Correct Answer: 2

Water that does not form scum is called

1. hard water
2. soft water
3. dirty water
4. clean water

✅ Correct Answer: 1

Process in which chlorine is added to water to kill any remaining bacteria is called

1. sedimentation
2. coagulation
3. filtration
4. chlorination

✅ Correct Answer: 4

Process in which water is treated with slaked lime and alum is called

1. sedimentation
2. coagulation
3. filtration
4. chlorination

✅ Correct Answer: 2

Water that does not give scum with soap is called

1. hard water
2. soft water
3. distilled water
4. alcoholic water

✅ Correct Answer: 2