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
Posted Date:-2021-12-30 19:15:45
The first step of sewage water treatment is called
1.primary sewage treatment
2.secondary sewage treatment
3.activated sludge treatment
4.chlorination
Posted Date:-2021-12-30 18:56:03
Which of the following is an intestinal disease caused by bacteria such as E.coli?
1. cholera
2.dysentery
3.jaundice
4.hepatitis
Posted Date:-2021-12-30 10:36:52
Addition of washing soda removes
1.softness of water
2.temporary hardness of water
3.permanent hardness of water
4.hydrogen from water
Posted Date:-2021-12-30 18:54:59
During thunderstorms, water dissolves
1.dust particles
2.HCl
3.nitric acid
4.clouds
Posted Date:-2021-12-30 18:58:41
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
Posted Date:-2021-12-30 19:13:37
Hepatitis is caused by
1. virus
2.bacteria
3.amoeba
4.parasite
Posted Date:-2021-12-30 18:59:32
How many basic steps are involved in raw water treatment?
1.three
2.four
3.five
4.six
Posted Date:-2021-12-30 18:52:46
How many basic steps are involved in sewage water treatment?
1.three
2.four
3.five
4.six
Posted Date:-2021-12-30 10:47:54
How much percentage of the Earth's crust is covered by water?
1. 0.69
2.0.71
3.0.8
4.0.75
Posted Date:-2021-12-30 19:12:41
Natural water is
1.pure
2.impure
3.non distilled
4.distilled
Posted Date:-2021-12-30 18:53:46
Out of total the amount of water available for human use is
1.0.003
2.0.002
3.0.4
4.0.5
Posted Date:-2021-12-30 10:53:51
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
Posted Date:-2021-12-30 10:34:25
Process in which chlorine is added to water to kill any remaining bacteria is called
1.sedimentation
2.coagulation
3.filtration
4.chlorination
Posted Date:-2021-12-30 22:54:02
Process in which water is allowed to stand in a reservoir is called
1. sedimentation
2.coagulation
3. filtration
4.chlorination
Posted Date:-2021-12-30 19:16:49
Process in which water is filtered through sand and gravel is called
1.sedimentation
2.coagulation
3.filtration
4.chlorination
Posted Date:-2021-12-30 18:52:01
Process in which water is treated with slaked lime and alum is called
1.sedimentation
2.coagulation
3.filtration
4.chlorination
Posted Date:-2021-12-30 22:55:27
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
Posted Date:-2021-12-30 10:45:19
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
Posted Date:-2021-12-30 10:26:09
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
Posted Date:-2021-12-30 10:57:08
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
Posted Date:-2021-12-30 10:35:15
Temporary hardness can be removed by adding
1.lime
2.carbon
3.oxygen
4.slaked lime
Posted Date:-2021-12-30 19:00:43
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
Posted Date:-2021-12-30 10:36:21
The density of water becomes maximum at 5 °C 12 °C
1.10 °C
2.4 °C
3.5 °C
4.12 °C
Posted Date:-2021-12-30 10:25:18
The fourth step of sewage water treatment is called
1.primary sewage treatment
2.secondary sewage treatment
3.activated sludge treatment
4.chlorination
Posted Date:-2021-12-30 10:46:50
The hardness that cannot be removed by boiling is called
1.temporary hardness
2. permanent hardness
3.semi temporary hardness
4.semi permanent hardness
Posted Date:-2021-12-30 10:24:25
The hardness which can be removed by boiling is called
1. permanent hardness
2.temporary hardness
3.stiffness
4.toughness
Posted Date:-2021-12-30 19:06:45
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
Posted Date:-2021-12-30 10:21:55
The second step of sewage water treatment is called
1. primary sewage treatment
2.secondary sewage treatment
3. activated sludge treatment
4.chlorination
Posted Date:-2021-12-30 10:57:55
The third step of sewage water treatment is called
1. primary sewage treatment
2. secondary sewage treatment
3.activated sludge treatment
4.chlorination
Posted Date:-2021-12-30 19:02:44
Water exists in how many different states on Earth?
1. one
2.two
3.three
4.four
Posted Date:-2021-12-30 19:04:29
Water exists in how many states?
1.1
2.2
3.3
4.4
Posted Date:-2021-12-30 10:47:16
Water in swimming pools is purified by adding sodium chlorine phosphorus potassium
1.sodium
2.chlorine
3.phosphorus
4.potassium
Posted Date:-2021-12-30 22:52:27
Water that does not form scum is called
1.hard water
2.soft water
3.dirty water
4.clean water
Posted Date:-2021-12-30 22:53:18
Water that does not give scum with soap is called
1.hard water
2. soft water
3. distilled water
4.alcoholic water
Posted Date:-2021-12-30 22:56:12
Water that easily gives lather with soap is called
1.hard water
2. soft water
3.dirty water
4.clean water
Posted Date:-2021-12-30 19:01:43
Water that gives little lather is called
1. hard water
2. soft water
3. dirty water
4.clean water
Posted Date:-2021-12-30 19:03:42
Water which forms scum with soap is called
1.hard water
2.soft water
3. distilled water
4.non distilled water
Posted Date:-2021-12-30 18:57:24
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
Posted Date:-2021-12-30 10:53:02
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
Posted Date:-2021-12-30 19:10:05
What is the first step of raw water treatment?
1.sedimentation
2.coagulation
3.filtration
4.chlorination
Posted Date:-2021-12-30 10:45:45
What is the fourth step of raw water treatment?
1.sedimentation
2.coagulation
3.filtration
4.chlorination
Posted Date:-2021-12-30 10:22:31
What is the percentage of atmospheric water?
1.0 0.
2.002
3.0.006
4.0.021
Posted Date:-2021-12-30 10:55:42
What is the percentage of groundwater?
1.0
2.0.002
3.0.006
4.0.021
Posted Date:-2021-12-30 10:42:02
What is the percentage of water from glaciers and ice caps?
1.0 0.
2.002 0
3..006
4.0.021
Posted Date:-2021-12-30 10:49:44
What is the percentage of water from oceans?
1.0
2.0.002
3.0.006
4.0.97
Posted Date:-2021-12-30 19:05:40
What is the percentage of water from rivers and lakes?
1.0
2.0.002
3. 0.006
4.0.021
Posted Date:-2021-12-30 10:32:15
What is the second step of raw water treatment?
1. sedimentation
2.coagulation
3.filtration
4.chlorination
Posted Date:-2021-12-30 10:27:32
What is the third step of raw water treatment?
1.sedimentation
2.coagulation
3.filtration
4.chlorination
Posted Date:-2021-12-30 10:50:32
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
Posted Date:-2021-12-30 19:14:38
What percentage of fresh water is available to man?
1.0.2
2.0.02
3.0.002
4.0.0002
Posted Date:-2021-12-30 10:27:01
What percentage of sodium chloride is present in seawater?
1. 0.02
2.0.1
3.0.034
4.0.01
Posted Date:-2021-12-30 19:08:08
Which of the following is a dangerous intestinal disease that spreads by polluted water containing bacteria?
1.typhoid
2.dysentery
3.amoeba
4.hepatitis
Posted Date:-2021-12-30 10:51:26
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
Posted Date:-2021-12-30 10:44:08
Which of the following is a disease that proceeds from obstruction of the liver?
1. cholera
2.dysentery
3.jaundice
4.hepatitis
Posted Date:-2021-12-30 19:11:45
Which of the following is an acute inflammation of the liver?
1.cholera
2.dysentery
3.jaundice
4.hepatitis
Posted Date:-2021-12-30 22:50:39
Which of the following is an intestinal disease caused by a parasite, entamoeba?
1. cholera
2.dysentery
3.jaundice
4.hepatitis
Posted Date:-2021-12-30 19:08:58
Which of the following is the most abundant salt in seawater?
1.magnesium chloride
2.calcium chloride
3.sodium chloride
4. sodium nitrate
Posted Date:-2021-12-30 10:43:27
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
Posted Date:-2021-12-30 19:10:51
Which type of Hepatitis spreads through polluted water?
1.hepatitis A only
2.hepatitis B only
3.hepatitis C
4.hepatitis A and B
Posted Date:-2021-12-30 10:42:46