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Olympiad Test : Water - 2 - Class 5 MCQ


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15 Questions MCQ Test Science Olympiad for Class 5 - Olympiad Test : Water - 2

Olympiad Test : Water - 2 for Class 5 2024 is part of Science Olympiad for Class 5 preparation. The Olympiad Test : Water - 2 questions and answers have been prepared according to the Class 5 exam syllabus.The Olympiad Test : Water - 2 MCQs are made for Class 5 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test : Water - 2 below.
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Olympiad Test : Water - 2 - Question 1
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When a mixture of salt + sugar + vinegar + lemon juice + soda was added into water, it resulted in the formation of a:

Detailed Solution for Olympiad Test : Water - 2 - Question 1
Explanation:
The given mixture consists of salt, sugar, vinegar, lemon juice, and soda when added to water. Let's analyze the possible outcomes.
A: Mixture in which all ingredients are mixed except soda that forms a separate layer:
- Salt, sugar, vinegar, lemon juice, and soda are all soluble in water.
- If the soda were to form a separate layer, it would indicate that it is insoluble in water, which is not the case.
- Therefore, this option is not applicable.
B: Soluble mixture:
- Salt, sugar, vinegar, and lemon juice are all soluble in water.
- When added to water, these substances dissolve completely, forming a homogeneous mixture.
- Soda is also soluble in water and will dissolve, contributing to the overall solubility of the mixture.
- This option is likely the correct answer.
C: Layers of different mixtures:
- This option suggests that the mixture would separate into distinct layers, each composed of different substances.
- However, all the given substances (salt, sugar, vinegar, lemon juice, and soda) are soluble in water.
- Therefore, it is unlikely that the mixture would form layers of different mixtures.
- This option is not applicable.
D: None of the above:
- This option is not applicable as option B, which suggests a soluble mixture, is the most suitable answer based on the given information.
In conclusion, based on the solubility of the given substances in water, the most likely outcome when the mixture is added to water is a soluble mixture (Option B).
Olympiad Test : Water - 2 - Question 2
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What is depicted in the image given below?

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Olympiad Test : Water - 2 - Question 3
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​Look at the following picture carefully and find out what processes are taking
place?

Olympiad Test : Water - 2 - Question 4
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Water’s high surface tension allows it to do which of the following?
Detailed Solution for Olympiad Test : Water - 2 - Question 4
Water's high surface tension allows it to do the following:
1. It gives water the ability to bead on objects:
- Surface tension is the property of water that allows it to resist external forces, causing it to form droplets or beads on surfaces.
- This can be observed when water droplets form on a waxed car or a polished surface.
2. It gives water a sticky property:
- Surface tension also gives water the ability to adhere or stick to other substances.
- This is why water can cling to the sides of a glass or a straw, forming a meniscus.
3. It gives water the ability to circulate upward on and through objects:
- Capillary action is a result of water's high surface tension.
- It allows water to move against gravity and travel upward through narrow spaces, such as the xylem vessels in plants.
Therefore, the correct answer is D: All of the above. Water's high surface tension enables it to bead on objects, exhibit a sticky property, and circulate upward.
Olympiad Test : Water - 2 - Question 5
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How many calories are absorbed/released when 1 gram of water freezes or melts?
Detailed Solution for Olympiad Test : Water - 2 - Question 5
Explanation:
To calculate the amount of energy absorbed or released when water freezes or melts, we need to use the specific heat capacity and the heat of fusion of water.
Specific Heat Capacity:
The specific heat capacity of water is the amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius. It is commonly given as 4.18 joules/gram°C.
Heat of Fusion:
The heat of fusion of water is the amount of energy required to change 1 gram of water from a solid to a liquid state (melting) or vice versa (freezing). It is commonly given as 334 joules/gram.
Calculating the Energy:
When water freezes, it releases energy. When it melts, it absorbs energy. The amount of energy released or absorbed can be calculated using the formula:
Energy = mass x specific heat capacity x change in temperature
For freezing or melting, the change in temperature is 0°C.
So, the energy released or absorbed when 1 gram of water freezes or melts can be calculated as:
Energy = 1 gram x 334 joules/gram = 334 joules
Therefore, the correct answer is C: 80 calories (approximately equal to 334 joules).
Olympiad Test : Water - 2 - Question 6
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Why doesn’t the temperature of water increase as it is undergoing a phase change?
Detailed Solution for Olympiad Test : Water - 2 - Question 6
Explanation:
The temperature of water does not increase during a phase change because the energy being added to the water is used to break the intermolecular hydrogen bonds between the water molecules. This energy is called latent heat and is used to overcome the forces holding the water molecules together.
Reasons:
The reasons why the temperature of water does not increase during a phase change are:
1. Energy consumption: The energy being added to the water is used to break the hydrogen bonds between the water molecules. This energy is known as latent heat.
2. Cooling effect: As the water undergoes a phase change, the absorbed energy serves to cool the water rather than increase its temperature. This is because the energy is being used to break the intermolecular bonds rather than increase the kinetic energy of the water molecules.
3. Energy release: During a phase change, the energy is not released to the surrounding atmosphere. Instead, it is absorbed by the water to break the hydrogen bonds.
4. Energy and temperature: Energy and temperature are related but are not the same thing. Temperature measures the average kinetic energy of the water molecules, while energy is the capacity to do work. During a phase change, the energy is used to break the intermolecular bonds rather than increase the temperature of the water.
In conclusion, the temperature of water does not increase during a phase change because the energy being added is used to break the intermolecular hydrogen bonds between the water molecules. This energy is known as latent heat and serves to cool the water rather than increase its temperature.
Olympiad Test : Water - 2 - Question 7
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As water vapour condenses, energy is___________and it the surrounding atmosphere.
Detailed Solution for Olympiad Test : Water - 2 - Question 7
Explanation:
When water vapor condenses, it changes from a gaseous state to a liquid state. During this process, energy is either released or absorbed, depending on the surrounding temperature. In this case, the water vapor is condensing in the atmosphere.
Here's a detailed explanation of each option:
Option A: Released; heats
- This option suggests that energy is released during condensation, and it heats the surrounding atmosphere.
- This is the correct answer because when water vapor condenses, it releases latent heat energy into the surrounding air, which warms up the atmosphere.
Option B: Absorbed; cools
- This option suggests that energy is absorbed during condensation, and it cools the surrounding atmosphere.
- This is incorrect because condensation releases heat energy, which has a warming effect on the surrounding air.
Option C: Absorbed; heats
- This option suggests that energy is absorbed during condensation, and it heats the surrounding atmosphere.
- This is incorrect because condensation releases heat energy, not absorbs it.
Option D: Released; cools
- This option suggests that energy is released during condensation, and it cools the surrounding atmosphere.
- This is incorrect because condensation releases heat energy, which has a warming effect on the surrounding air.
In summary, when water vapor condenses, energy is released and it heats the surrounding atmosphere. Therefore, the correct answer is option A: Released; heats.
Olympiad Test : Water - 2 - Question 8
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What is the greatest significance of latent heat?
Detailed Solution for Olympiad Test : Water - 2 - Question 8

Greatest significance of latent heat:




Explanation:



  • Latent heat: Latent heat is the energy absorbed or released by a substance during a phase change without a change in temperature.

  • Significance of latent heat:


    • Allows water vapor to serve as a large reservoir of heat in the Earth's atmosphere: Water has a high latent heat of vaporization, meaning it requires a large amount of energy to change from liquid to vapor. This allows water vapor to absorb and store a significant amount of heat energy in the Earth's atmosphere, contributing to the regulation of global temperatures and climate.





Conclusion: The greatest significance of latent heat is that it allows water vapor to serve as a large reservoir of heat in the Earth's atmosphere, contributing to the regulation of global temperatures and climate.

Olympiad Test : Water - 2 - Question 9
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What is the correct definition of solubility?
Detailed Solution for Olympiad Test : Water - 2 - Question 9
Definition of Solubility:
The correct definition of solubility is:
The ability of a solute to dissolve into a solvent.
Explanation:
Solubility refers to the ability of a substance, known as the solute, to dissolve in a solvent and form a homogeneous solution. Here, the solute is the substance that is being dissolved, while the solvent is the substance in which the solute is dissolved.
In a solution, the solute particles are dispersed and evenly distributed throughout the solvent, resulting in a uniform mixture. The solubility of a solute depends on various factors, including the nature of the solute and solvent, temperature, and pressure.
The correct definition of solubility as the ability of a solute to dissolve into a solvent distinguishes it from other related concepts such as dispersibility (the ability of solid particles to disperse in a liquid) and emulsification (the ability of immiscible liquid droplets to disperse within a second liquid phase).
To summarize, solubility is specifically concerned with the dissolution of a solute in a solvent, leading to the formation of a homogeneous solution.
Olympiad Test : Water - 2 - Question 10
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Read the following paragraph and arrange the following mentioned events (A, B,
C, D) in the order in which they took place.
“Titanic was a British passenger liner that sank in the North Atlantic Ocean on 15 April,
1912 after colliding with an iceberg on 14 April, 1912. Some 1500 people perished.”
A. The ship sank
B. The fast moving ship hit an iceberg
C. Ship was floating in the ocean
D. The ship got pierced from one corner after hitting the iceberg and the water from
the ocean started entering the ship
Detailed Solution for Olympiad Test : Water - 2 - Question 10

The events mentioned in the paragraph can be arranged in the following order:
1. The ship was floating in the ocean.
- The Titanic was a British passenger liner that was sailing in the North Atlantic Ocean.
2. The fast moving ship hit an iceberg.
- The ship collided with an iceberg on 14 April, 1912.
3. The ship got pierced from one corner after hitting the iceberg and the water from the ocean started entering the ship.
- After the collision, the ship suffered damage and started taking in water.
4. The ship sank.
- The Titanic sank in the North Atlantic Ocean on 15 April, 1912, resulting in the loss of approximately 1500 lives.
Therefore, the correct order of events is CBDA.
Olympiad Test : Water - 2 - Question 11
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Aquatic plants are also known as:
Detailed Solution for Olympiad Test : Water - 2 - Question 11
Aquatic plants are also known as hydrophytes.



Hydrophytes are plants that have adapted to live and grow in aquatic environments such as freshwater or marine habitats. They have unique characteristics that enable them to survive in waterlogged conditions. Here are some key points to consider:
1. Definition:
- Aquatic plants are plants that live in or near water bodies, such as lakes, rivers, ponds, and wetlands.
- They are specifically adapted to grow and thrive in aquatic environments.
2. Characteristics of hydrophytes:
- Hydrophytes have specialized adaptations to cope with being submerged in water for extended periods.
- They have modified root systems that help in anchoring the plant and absorbing nutrients from the water.
- Their stems and leaves are often elongated and flexible to withstand water currents.
- Many aquatic plants have air-filled spaces in their tissues, which provide buoyancy and help them float.
- They may also have specialized structures for efficient gas exchange, such as stomata on the upper surface of their leaves.
3. Importance of aquatic plants:
- Aquatic plants play a crucial role in maintaining the health and balance of aquatic ecosystems.
- They provide habitat and food for various organisms, including fish, insects, and amphibians.
- Aquatic plants help in water purification by absorbing excess nutrients and pollutants.
- They stabilize shorelines and prevent erosion by reducing wave action.
- Some aquatic plants, such as watercress and wild rice, are also used for human consumption.
In conclusion, aquatic plants, also known as hydrophytes, are specially adapted to live in water and have unique characteristics that enable them to thrive in aquatic environments. They are important for the health and balance of aquatic ecosystems and provide various benefits to both wildlife and humans.
Olympiad Test : Water - 2 - Question 12
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​Keerti wanted to check the solubility of some solids like sugar, salt, chalk powder, and saw dust in water. She took four beakers containing equal amount of water. Then she added the solids to each beaker, stirred the contents with a spoon and waited for some time. What did she observe?
Olympiad Test : Water - 2 - Question 13
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Insoluble impurities may be removed from water by:
Detailed Solution for Olympiad Test : Water - 2 - Question 13

To remove insoluble impurities from water, sedimentation is the most effective method. Here is a detailed explanation of how sedimentation works:
Sedimentation:
- Sedimentation is the process of allowing suspended particles to settle down at the bottom of a container through the force of gravity.
- When water containing insoluble impurities is left undisturbed, these impurities gradually settle down due to their higher density.
- Sedimentation is commonly used in water treatment plants, where the water is allowed to stand in large settling tanks or basins.
- The settling tanks are designed in a way that allows the water to flow slowly, giving enough time for the impurities to settle down.
- Once the impurities have settled, the clearer water is then collected from the top and further treated if necessary.
Advantages of Sedimentation:
- Sedimentation is a simple and cost-effective method to remove insoluble impurities from water.
- It does not require any chemicals or complex equipment.
- Sedimentation can remove larger particles, such as sand, silt, and clay, which are commonly found in natural water sources.
Limitations of Sedimentation:
- Sedimentation is not effective for removing dissolved impurities or very fine suspended particles.
- It may take a long time for the impurities to settle completely, depending on their concentration and the design of the settling tanks.
- Sedimentation alone may not be sufficient to achieve the desired level of purity in water. Additional treatment methods, such as filtration or disinfection, may be required.
In conclusion, sedimentation is a reliable and widely used method for removing insoluble impurities from water. It is a natural process that takes advantage of gravity to separate the impurities from the water.
Olympiad Test : Water - 2 - Question 14
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The process by which an insoluble impurity is separated from a liquid by passing the mixture through filter paper is called:
Detailed Solution for Olympiad Test : Water - 2 - Question 14
The process by which an insoluble impurity is separated from a liquid by passing the mixture through filter paper is called filtration.
Filtration is a commonly used method for separating solid impurities from a liquid mixture. It involves passing the mixture through a filter paper, which acts as a barrier to trap the insoluble impurities while allowing the liquid to pass through. Here is a detailed explanation of the filtration process:
1. Setup
- A funnel is placed on a support stand, and a filter paper is folded and placed in the funnel.
- The filter paper should fit snugly in the funnel to ensure efficient filtration.
2. Pouring the mixture
- The liquid mixture containing the insoluble impurities is poured into the funnel, allowing it to pass through the filter paper.
- The impurities get trapped on the filter paper, forming a solid residue.
3. Collection of filtrate
- The liquid that passes through the filter paper is called the filtrate.
- It collects in a container placed below the funnel.
4. Separation of solid and liquid
- The solid residue on the filter paper is carefully removed and discarded.
- The filtrate, which is now free from the insoluble impurities, can be collected and used for further processes.
5. Importance of filtration
- Filtration is used in various industries and laboratories to separate solids from liquids.
- It is especially useful when the impurities are insoluble and need to be removed from a liquid solution.
- Filtration helps in obtaining a pure liquid product, free from unwanted solid particles.
In conclusion, filtration is the process of separating insoluble impurities from a liquid by passing the mixture through filter paper. It is a widely used technique for purification and separation purposes.
Olympiad Test : Water - 2 - Question 15
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This form of water is called the purest form of water and is used in car batteries:
Detailed Solution for Olympiad Test : Water - 2 - Question 15
Distilled water is the purest form of water and is used in car batteries.
Explanation:
Distilled water is a type of purified water that has gone through a process called distillation. During distillation, water is heated to create steam, and then the steam is cooled and condensed back into liquid water. This process helps remove impurities and contaminants from the water, making it highly pure.
Key points:
- Distilled water is the purest form of water because it has been stripped of impurities and minerals.
- Car batteries require distilled water because impurities or minerals found in other types of water can interfere with the battery's performance and lifespan.
- Boiled water may remove some impurities but doesn't guarantee the same level of purity as distilled water.
- Reverse osmosis (RO) water and filtered water may have some impurities removed, but they are not as pure as distilled water.
- Distilled water is commonly used in car batteries to ensure optimal performance and prevent any chemical reactions that could damage the battery.
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