Water
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Preview questions (no answers)
- 1.
Which of the following would happen if there was no water on Earth?
A.Plants would grow faster
B.Life would not exist
C.There would be more rain
D.Animals would thrive
- 2.
What happens to most of the water on Earth when it is heated by the sun?
A.It freezes into ice
B.It evaporates into the air
C.It turns into soil
D.It disappears forever
- 3.
Animals that live in water are called ________ animals.
A.Terrestrial
B.Aquatic
C.Aerial
D.Arboreal
- 4.
Which of the following is a source of surface water?
A.Tube well
B.Pond
C.Aquifer
D.Spring
- 5.
Water is a major constituent of 'Mucus'. What is the function of mucus in the human respiratory tract?
A.To help in the digestion of air
B.To trap dust particles and pathogens
C.To make the lungs more colorful
D.To produce oxygen from the blood
- 6.
Which of the following is an example of water's importance as a habitat?
A.A bird building a nest in a tree
B.Coral reefs supporting a vast variety of marine life
C.A desert fox living in a burrow
D.A spider weaving a web on a wall
- 7.
How does water assist in the movement of food through the esophagus?
A.By making the food rough and dry
B.By providing lubrication so the food can slide down easily
C.By pushing the food up towards the mouth
D.By turning the food into a solid block
- 8.
Which of the following statements best explains why water is considered a 'Biochemical Medium'?
A.Most metabolic reactions in the cell occur only when the reactants are dissolved in water.
B.Water provides the blueprints (DNA) for making new cells.
C.Water is the only substance that can produce electricity inside a cell.
D.Water acts as a hard skeleton for all microscopic organisms.
- 9.
In the context of 'Water Conservation', what is the significance of the 'Recharge Pit' in a rainwater harvesting system?
A.It allows collected rainwater to filter through layers of sand and stone to replenish the underground water table.
B.It is a pit where water is heated by the earth to create steam for the house.
C.It is used to store garbage so that it doesn't pollute the rain.
D.It is a deep hole used to hide the water from the sun so it never evaporates.
- 10.
Why is the presence of 'Dissolved Oxygen' in water bodies crucial, and how does the temperature of water affect it?
A.It allows aquatic animals to breathe; colder water can generally hold more dissolved oxygen than warmer water.
B.It makes the water sparkle; warmer water has more oxygen because it is closer to the sun.
C.It is used by fish to build their scales; temperature has no effect on oxygen levels.
D.It is used to make the water salty; as water boils, oxygen levels increase.
Download the worksheet for Water - Importance of Water to practice offline. It includes additional chapter-level practice questions.
Preview questions (no answers)
- 1.
Water vapor rises in the atmosphere because it is:
A.Heavier than air
B.Lighter than air
C.The same weight as air
D.Full of salt
- 2.
Which of these helps in the formation of clouds?
A.Dust particles in the air
B.High temperature on the ground
C.The salt in the sea
D.Plastic in the ocean
- 3.
If you leave a wet cloth in the sun, it dries. This shows the process of:
A.Condensation
B.Infiltration
C.Evaporation
D.Precipitation
- 4.
Most of the Earth's freshwater is trapped in:
A.Oceans
B.The atmosphere
C.Glaciers and polar ice caps
D.Rivers and streams
- 5.
The constant movement of water between the Earth and the atmosphere ensures that:
A.The total amount of water on Earth remains nearly constant.
B.The oceans will eventually dry up.
C.New water is constantly being created from oxygen.
D.Rainwater will eventually become salty.
- 6.
What determines whether precipitation falls as rain, snow, or sleet?
A.The speed of the wind.
B.The temperature of the air layers through which it falls.
C.The amount of salt in the clouds.
D.The distance from the ocean.
- 7.
A student covers a small potted plant with a clear plastic bag and ties it. After a few hours, droplets appear inside the bag. What does this demonstrate?
A.Photosynthesis
B.Transpiration
C.Respiration in soil
D.Guttation only
- 8.
Which of these processes describes the change of state when frost forms on a cold window pane during the night?
A.Deposition (Gas to Solid).
B.Condensation (Gas to Liquid).
C.Solidification (Liquid to Solid).
D.Sublimation (Solid to Gas).
- 9.
How does 'Cloud Seeding' attempt to manipulate the water cycle?
A.By dispersing substances like silver iodide into clouds to act as condensation nuclei and encourage precipitation.
B.By using giant fans to blow clouds from the ocean toward dry desert regions.
C.By spraying water into the air to create artificial clouds during a drought.
D.By heating the atmosphere with lasers to force water vapor to evaporate faster.
- 10.
What is the primary energy source that drives the movement of water against gravity in the water cycle (e.g., evaporation and transpiration)?
A.Solar radiation (The Sun).
B.The Earth's internal geothermal heat.
C.Tidal forces from the Moon.
D.The rotation of the Earth on its axis.
Download the worksheet for Water - Water Cycle to practice offline. It includes additional chapter-level practice questions.
Preview questions (no answers)
- 1.
In a laboratory, if you want to separate water from a salt solution to get both the salt and the pure water, which method is used?
A.Filtration
B.Decantation
C.Distillation
D.Loading
- 2.
What is the primary reason for treating water before it reaches our homes?
A.To make it flow faster in pipes
B.To prevent the spread of diseases
C.To make it warmer
D.To increase the weight of water
- 3.
Which of these is NOT a water-borne disease?
A.Dysentery
B.Amoebiasis
C.Typhoid
D.Tuberculosis
- 4.
A 'potable' water source is one that is:
A.Used for washing cars only
B.Safe and fit for human consumption
C.Only found in the oceans
D.Used only for industrial cooling
- 5.
Which chemical is often used to remove the 'hardness' of water at an industrial level to make it fit for certain uses, although not always for drinking?
A.Washing Soda ()
B.Sugar
C.Citric acid
D.Starch
- 6.
In the process of 'Solar Water Disinfection' (SODIS), what helps kill the germs?
A.The weight of the water
B.UV rays from the sun and the increase in temperature
C.The darkness of the night
D.The reflection of the moon
- 7.
What is the effect of excessively high 'hardness' in drinking water?
A.It makes the water taste like lemon
B.It can lead to the formation of kidney stones over long periods
C.It makes the water transparent
D.It removes all bacteria instantly
- 8.
What is the primary role of 'Iron Filings' in some specialized filters used in areas with high arsenic levels?
A.To make the water magnetic.
B.To react with and adsorb arsenic, forming a solid that can be filtered out.
C.To provide iron as a nutrient to the drinking water.
D.To scrape the bacteria off the sides of the filter.
- 9.
Which gas is used in some high-end treatment plants for 'Disinfection' because it is a stronger oxidant than chlorine and does not leave a taste?
A.Nitrogen
B.Ozone ()
C.Helium
D.Carbon dioxide
- 10.
In a rural setup, 'Double Pot Filtration' is used. What is the mechanism here?
A.Water is boiled in two pots simultaneously to double the heat.
B.Water is filtered through sand and charcoal in an upper pot before dripping into a lower storage pot.
C.One pot is used for cold water and the other for hot water to mix them.
D.Two pots are used to trap sunlight to kill the bacteria.
Download the worksheet for Water - Potable Water to practice offline. It includes additional chapter-level practice questions.
Causes of Water Pollution and Conservation
SubtopicCauses of Water Pollution and Conservation under Water for Grade 6 ICSE.
Preview questions (no answers)
- 1.
Which of these materials is a common water pollutant found in batteries?
A.Vitamin C
B.Heavy metals like Lead or Mercury
C.Sugar
D.Baking soda
- 2.
Conservation of water is necessary because:
A.Fresh water is an unlimited resource
B.Fresh water is limited and essential for life
C.Plants do not need water to grow
D.The ocean water is already drinkable
- 3.
Which of these is a source of groundwater?
A.Rivers
B.Aquifers
C.Clouds
D.Glaciers
- 4.
What is the effect of water pollution on the beauty of a tourist spot like a lake?
A.It makes the lake more attractive
B.It causes bad smells and makes the water look dirty
C.It has no effect on the scenery
D.It attracts more colorful fish
- 5.
Which of the following is NOT a benefit of rainwater harvesting?
A.Recharging groundwater
B.Reducing soil erosion
C.Increasing the cost of water supply
D.Meeting water demands during dry seasons
- 6.
During a drought, the water table typically:
A.Rises
B.Stays the same
C.Falls
D.Disappears forever
- 7.
Excessive nitrates and phosphates in water bodies come mostly from:
A.Paper mills
B.Agricultural fertilizers and detergents
C.Lead batteries
D.Oil refineries
- 8.
Which of the following is a direct consequence of dumping untreated 'Domestic Sewage' into a flowing river?
A.The river water becomes too cold for fish to survive.
B.Introduction of pathogens and a decrease in dissolved oxygen as organic matter decomposes.
C.The water becomes permanently turned into a solid gel.
D.An increase in the amount of beneficial minerals like gold and silver in the water.
- 9.
How does 'Over-irrigation' in arid regions lead to 'Soil Salinization' (buildup of salts)?
A.The water contains high amounts of sugar which turn into salt.
B.The excess water causes the water table to rise, bringing deep-seated salts to the surface; as the water evaporates, the salt stays behind.
C.Over-irrigation washes away the plants, leaving only the salt that was inside them.
D.The weight of the extra water squeezes the salt out of the soil particles.
- 10.
In agricultural water conservation, 'furrow irrigation' is often replaced by other methods because it:
A.Uses too much fertilizer and not enough water.
B.Leads to high water loss through deep percolation and evaporation from the large exposed surface area.
C.Causes the plants to grow too many roots and not enough fruit.
D.Requires the water to be heated before it can be applied to the furrows.
Download the worksheet for Water - Causes of Water Pollution and Conservation to practice offline. It includes additional chapter-level practice questions.