CBES Board Class 10/ENVIRONMENTAL CHEMISTRY II WATER MCQS Sample Test,Sample questions

Question:
 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


Question:
 The first step of sewage water treatment is called

1.primary sewage treatment

2.secondary sewage treatment

3.activated sludge treatment

4.chlorination


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

1. cholera

2.dysentery

3.jaundice

4.hepatitis


Question:
Addition of washing soda removes

1.softness of water

2.temporary hardness of water

3.permanent hardness of water

4.hydrogen from water


Question:
During thunderstorms, water dissolves

1.dust particles

2.HCl

3.nitric acid

4.clouds


Question:
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


Question:
Hepatitis is caused by

1. virus

2.bacteria

3.amoeba

4.parasite


Question:
How many basic steps are involved in raw water treatment?

1.three

2.four

3.five

4.six


Question:
How many basic steps are involved in sewage water treatment?

1.three

2.four

3.five

4.six


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

1. 0.69

2.0.71

3.0.8

4.0.75


Question:
Natural water is

1.pure

2.impure

3.non distilled

4.distilled


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

1.0.003

2.0.002

3.0.4

4.0.5


Question:
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


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

1.sedimentation

2.coagulation

3.filtration

4.chlorination


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

1. sedimentation

2.coagulation

3. filtration

4.chlorination


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

1.sedimentation

2.coagulation

3.filtration

4.chlorination


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

1.sedimentation

2.coagulation

3.filtration

4.chlorination


Question:
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


Question:
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


Question:
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


Question:
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


Question:
Temporary hardness can be removed by adding

1.lime

2.carbon

3.oxygen

4.slaked lime


Question:
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


Question:
The density of water becomes maximum at

5 °C
12 °C

1.10 °C

2.4 °C

3.5 °C

4.12 °C


Question:
The fourth step of sewage water treatment is called

1.primary sewage treatment

2.secondary sewage treatment

3.activated sludge treatment

4.chlorination


Question:
The hardness that cannot be removed by boiling is called

1.temporary hardness

2. permanent hardness

3.semi temporary hardness

4.semi permanent hardness


Question:
The hardness which can be removed by boiling is called

1. permanent hardness

2.temporary hardness

3.stiffness

4.toughness


Question:
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


Question:
The second step of sewage water treatment is called

1. primary sewage treatment

2.secondary sewage treatment

3. activated sludge treatment

4.chlorination


Question:
The third step of sewage water treatment is called

1. primary sewage treatment

2. secondary sewage treatment

3.activated sludge treatment

4.chlorination


Question:
Water exists in how many different states on Earth?

1. one

2.two

3.three

4.four


Question:
Water exists in how many states?

1.1

2.2

3.3

4.4


Question:
Water in swimming pools is purified by adding

sodium
chlorine
phosphorus
potassium

1.sodium

2.chlorine

3.phosphorus

4.potassium


Question:
Water that does not form scum is called

1.hard water

2.soft water

3.dirty water

4.clean water


Question:
Water that does not give scum with soap is called

1.hard water

2. soft water

3. distilled water

4.alcoholic water


Question:
Water that easily gives lather with soap is called

1.hard water

2. soft water

3.dirty water

4.clean water


Question:
Water that gives little lather is called

1. hard water

2. soft water

3. dirty water

4.clean water


Question:
Water which forms scum with soap is called

1.hard water

2.soft water

3. distilled water

4.non distilled water


Question:
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


Question:
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


Question:
What is the first step of raw water treatment?




1.sedimentation

2.coagulation

3.filtration

4.chlorination


Question:
What is the fourth step of raw water treatment?




1.sedimentation

2.coagulation

3.filtration

4.chlorination


Question:
What is the percentage of atmospheric water?

1.0 0.

2.002

3.0.006

4.0.021


Question:
What is the percentage of groundwater?

1.0

2.0.002

3.0.006

4.0.021


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

1.0 0.

2.002 0

3..006

4.0.021


Question:
What is the percentage of water from oceans?

1.0

2.0.002

3.0.006

4.0.97


Question:
What is the percentage of water from rivers and lakes?

1.0

2.0.002

3. 0.006

4.0.021


Question:
What is the second step of raw water treatment?

1. sedimentation

2.coagulation

3.filtration

4.chlorination


Question:
What is the third step of raw water treatment?

1.sedimentation

2.coagulation

3.filtration

4.chlorination


Question:
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


Question:
What percentage of fresh water is available to man?

1.0.2

2.0.02

3.0.002

4.0.0002


Question:
What percentage of sodium chloride is present in seawater?

1. 0.02

2.0.1

3.0.034

4.0.01


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

1.typhoid

2.dysentery

3.amoeba

4.hepatitis


Question:
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


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

1. cholera

2.dysentery

3.jaundice

4.hepatitis


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




1.cholera

2.dysentery

3.jaundice

4.hepatitis


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

1. cholera

2.dysentery

3.jaundice

4.hepatitis


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

1.magnesium chloride

2.calcium chloride

3.sodium chloride

4. sodium nitrate


Question:
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


Question:
Which type of Hepatitis spreads through polluted water?

1.hepatitis A only

2.hepatitis B only

3.hepatitis C

4.hepatitis A and B


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