Water

Water on the surface of the earth is found mainly in _____________.
1. Lake
2. Oceans
3. River
4. Pond
How much percentage of water in present in oceans?
1. 2.05%
2. 0.7%
3. 97.25%
4. None
How much percentage of water in present in polar ice caps and glaciers?
1. 2.05%
2. 0.7%
3. 97.25%
4. None
Even our body is made up of __% of water but it is not apparent.
1. 20%
2. 65%
3. 5%
4. 10%
Water is a chemically stable compound. Its chemical name is ____________
1. Hydrogen
2. Monooxide
3. Dihydrogen
4. Dihydrogen monoxide
What is the molecular formula of water.
1. H2O
2. CO2
3. H2
4. O2
What is the formula of oxygen.
1. H2O
2. CO2
3. H2
4. O2
Water is combination of ___________ and ______________.
1. Oxygen, Carbon
2. Hydrogen, Carbon dioxide
3. Hydrogen ,Oxygen
4. Carbon dioxide, Oxygen
Preparation of water 2H2 + ? ---> 2H2O
1. O2
2. 2O2
3. H2
4. 2H2
C6H12O6 + 6O2 ------> 6CO2 + 6H2O + ?
1. Oxygen
2. Glucose
3. Carbon dioxide
4. Energy
Water changes to ice at
1. 0 degree C
2. 100 degreeC
3. 102 degree C
4. 98 degree C
Water boils at
1. 0 degree C
2. 100 degree C
3. 102 degree C
4. 98 degree C
____________is broken down into its constituent elements by electrolysis.
1. Hydrogen
2. Oxygen
3. Water
4. All the above
During electrolysis hydrogen and oxygen are obtained in the ratio
1. 1:2
2. 2:1
3. 2:3
4. 1:3
Water has a maximum density of 1 g/cc at
1. 1 degree C
2. 2 degree C
3. 2 degree C
4. 4 degre C
Sea water contains many minerals and salts dissolved in it and so it is said to be _________..
1. Saline
2. aquatic
3. Both a and b
4. None
Water that is used for drinking is called _______ water.
1. Drinking
2. Potable
3. Filtered
4. All the above
Hardness of water is due to the presence of which salts?
1. Potassium
2. Calcium
3. Magnesium
4. Both b and c
Breaking down of substances by the passage of electric current.
1. Sterilization
2. Eutrophication
3. Electrolysis
4. Aeration
Addition of chemicals to kill the microorganisms present in water.
1. Sterilization
2. Aeration
3. Electrolysis
4. Eutrophication
Over growth of algae in water bodies due to excessive fertilizers.
1. Electrolysis
2. Eutrophication
3. Sterilization
4. Aeration
Amount of heat that is needed to raise the temperature of a unit mass of a substance by 1°C
1. Specific heat capacity
2. Aeration
3. Electrolysis
4. Latent heat of fusion
Amount of heat energy required by ice to change into water
1. Specific heat capacity
2. Aeration
3. Electrolysis
4. Latent heat of fusion
The process in which air under pressure is blown into filtered water.
1. Electrolysis
2. Aeration
3. Water conservation
4. Eutrophication
Addition of unwanted materials to the water
1. Water pollution
2. Domestic sewage
3. Water conservation
4. Aeration
Wastewater that is disposed of from households.
1. Water pollution
2. Domestic sewage
3. Water conservation
4. Aeration
Saving water for the use in future.
1. Water pollution
2. Domestic sewage
3. Water conservation
4. Aeration
Sea water is suitable for irrigation as it contains dissolved salts
1. True
2. False
Sewage should be treated well before being discharged it into water bodies
1. True
2. False
Soap lathers well in hard water.
1. True
2. False
2Mg + 2H2O ----> Mg(OH)2 + ?
1. O2
2. H2
3. H2O
4. 2H2
Air dissolved in water contains approximately ___% oxygen along with nitrogennd carbon dioxide.
1. 65.3%
2. 36.5%
3. 53.6%
4. 35.6%
Aquatic plants make use of dissolved carbon dioxide for ______
1. Photosynthesis
2. Respiration
3. Survival
4. All the above
Carbon dioxide dissolved in water reacts with limestone to form ______________.
1. calcium.
2. calcium carbonate.
3. calcium bicarbonate.
4. bicarbonate.
Chemical formula od sodium chloride
1. NaCl2
2. CaCl
3. Na2Cl
4. NaCl
Potable water is
1. Colourless
2. Odourless
3. Transparent
4. All the above
Temporary hardness is easily removed from water by boiling.
1. True
2. False
Baking soda is used to remove permanent hardness of water.
1. True
2. False
The percentage of the available surface water has already been tapped mainly for agricultureand irrigation is
1. 90%
2. 10%
3. Undefined
4. none
What type of detergents to be used to control water pollution
1. degradable
2. biodegradable
3. bidegradable
4. All the above
Do not throw waste such as plastics into water bodies.
1. True
2. False
Water released from industries should be treated after being discharged.
1. True
2. False
Use bio-pesticides (natural pest control) instead of chemical pest control.
1. True
2. False
The gas collected at the cathode on electrolysis of water is
1. oxygen
2. hydrogen
3. nitrogen
4. carbon dioxide
Solubility of carbon dioxide in water is high when the
1. pressure is low
2. pressure is high
3. temperature is high
4. None of the above

Water

Quiz