Water Quiz - ICSE Class 8 Science
Free practice quiz: Water (ICSE Class 8 Science). 48 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
This ICSE Class 8 Science practice quiz has 48 multiple-choice questions on Water, and 48 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.
Start quiz: 48 questions, freeSample questions
Which property of water makes it an excellent solvent for ionic compounds?
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Answer: C. Polar nature
Water molecules are polar, meaning they have a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom. This polarity allows water to attract and surround the ions of ionic compounds, effectively dissolving them.
When water is heated, its volume increases, but its mass remains constant. This is an illustration of the:
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Answer: A. Law of Conservation of Mass
The Law of Conservation of Mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. While the volume of water changes with temperature, its mass (the amount of matter) remains the same.
The process of groundwater seeping to the surface to form springs is an example of:
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Answer: D. Discharge
Discharge is the release of water from an aquifer or groundwater system onto the surface of the Earth, often forming springs, rivers, or seeps.
Water molecules have a polarity due to:
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Answer: B. The bent shape of the molecule and the electronegativity difference between oxygen and hydrogen
Oxygen is more electronegative than hydrogen, meaning it attracts electrons more strongly. This creates partial negative charge on oxygen and partial positive charges on hydrogen. The bent shape of the water molecule prevents these partial charges from canceling each other out, resulting in an overall molecular polarity.
The difference between temporary and permanent water hardness is primarily due to:
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Answer: B. The type of dissolved salts causing the hardness
Temporary hardness is caused by dissolved bicarbonates of calcium and magnesium, which can be removed by boiling. Permanent hardness is caused by dissolved sulfates and chlorides of calcium and magnesium, which require other methods like ion exchange to remove.
More questions in this quiz
Answers and explanations are in the full quiz.
- The process by which water vapor in the atmosphere cools and changes back into liquid water, forming clouds, is called:
- What is the primary reason for the high specific heat capacity of water?
- Hard water contains dissolved mineral salts, primarily:
- If water is heated to 100°C at standard atmospheric pressure, it undergoes:
- Desalination is the process of removing dissolved salts from seawater. Which of the following is a common method used for desalination?
- Why does ice float on water?
- The presence of dissolved oxygen in water is crucial for:
- Which of the following is NOT a property of pure water?
- The removal of temporary hardness from water can be achieved by:
- Which process in the water cycle involves water being absorbed by the roots of plants and then released into the atmosphere as water vapor?
- The temporary hardness of water can be removed by:
- What is the primary source of potable water for most urban populations?
- Which of the following is responsible for the phenomenon of capillary action in water?
- Water pollution can be detrimental to aquatic ecosystems. Which of the following is a major indicator of organic pollution in a water body?
- The change of state from liquid water to water vapor at temperatures below the boiling point is called:
- Water can form hydrates with many salts. In a hydrate, water molecules are:
- Which of the following treatments is used to remove permanent hardness from water?
- The term 'aquifer' refers to:
- What is the chemical formula for heavy water?
- Which gas is primarily responsible for the acidic nature of acid rain, often impacting water bodies?
- When water is used to extinguish a fire, it works by:
- The capacity of water to absorb heat without a significant change in temperature is referred to as its:
- What is the pH of pure water at 25°C?
- Which of the following is a form of precipitation?
- The process of removing dissolved salts from seawater to make it fit for drinking is called:
- What is the primary difference between hard water and soft water?
- The presence of dissolved ozone (O₃) in water is often associated with:
- The process by which water moves through soil and rock layers is called:
- Which phenomenon explains why water rises in a narrow glass tube?
- What is the main disadvantage of using rivers as a source of drinking water?
- The boiling point of water:
- Water is often called the 'universal solvent' because:
- The process that converts liquid water into ice is:
- What is the chemical formula for ozone, a form of oxygen that can be involved in water purification processes?
- Which of the following is a direct result of increased water temperature in a lake?
- When water is used as a coolant, its effectiveness is primarily due to:
- The process by which water vapor changes into liquid water is called:
- What is the role of alum (aluminum sulfate) in water purification?
- The total amount of water on Earth remains relatively constant due to:
- Which of the following is a non-point source of water pollution?
- The molecule of water (H₂O) is described as bent. This shape is crucial for its:
- What is the main difference between evaporation and boiling?
- The process of filtering water through sand and gravel layers is primarily used to remove:
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