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All questions of A Journey through States of Water for Class 6 Exam
What is the role of condensation in the water cycle?- a)It turns liquid water into vapor
- b)It helps form clouds and rain
- c)It makes water seep into the ground
- d)It dries wet surfaces
Correct answer is option 'B'. Can you explain this answer?
What is the role of condensation in the water cycle?
a)
It turns liquid water into vapor
b)
It helps form clouds and rain
c)
It makes water seep into the ground
d)
It dries wet surfaces
|
Edgy Education answered |
- Condensation is the process where water vapor in the air cools down and changes back into liquid water.
- This process is essential for cloud formation, as tiny droplets gather in the atmosphere.
- When these droplets combine and grow larger, they eventually fall as precipitation, such as rain.
- Thus, condensation plays a crucial role in forming clouds and rain
Which process describes the change from liquid water to water vapour?- a)Melting
- b)Freezing
- c)Evaporation
- d)Condensation
Correct answer is option 'C'. Can you explain this answer?
a)
Melting
b)
Freezing
c)
Evaporation
d)
Condensation
|
Aditya Menon answered |
Understanding Evaporation
The process of changing from liquid water to water vapour is known as evaporation. Let's explore this in detail.
What is Evaporation?
- Evaporation is the process where liquid water transforms into water vapour, a gas.
- This occurs when water molecules gain enough energy to break free from the liquid's surface.
How Does It Happen?
- Heat Energy:
- When heat is applied, such as from the sun or a heater, the temperature of the water increases.
- This added energy causes some water molecules to move faster.
- Molecular Movement:
- As the molecules gain kinetic energy, they start to escape from the surface of the water.
- These escaping molecules turn into water vapour.
Conditions for Evaporation
- Temperature:
- Higher temperatures increase the rate of evaporation.
- Surface Area:
- A larger surface area allows more molecules to escape at once, thus speeding up evaporation.
- Air Movement:
- Wind or air currents can carry away water vapour, allowing more liquid water to evaporate.
Examples of Evaporation
- Puddles Drying:
- After rain, puddles disappear as the water evaporates into the air.
- Sweating:
- When we sweat, the moisture on our skin evaporates, helping to cool our body.
In summary, evaporation is a vital process that transforms liquid water into water vapour, driven by heat and conditions that facilitate the transition from liquid to gas.
The process of changing from liquid water to water vapour is known as evaporation. Let's explore this in detail.
What is Evaporation?
- Evaporation is the process where liquid water transforms into water vapour, a gas.
- This occurs when water molecules gain enough energy to break free from the liquid's surface.
How Does It Happen?
- Heat Energy:
- When heat is applied, such as from the sun or a heater, the temperature of the water increases.
- This added energy causes some water molecules to move faster.
- Molecular Movement:
- As the molecules gain kinetic energy, they start to escape from the surface of the water.
- These escaping molecules turn into water vapour.
Conditions for Evaporation
- Temperature:
- Higher temperatures increase the rate of evaporation.
- Surface Area:
- A larger surface area allows more molecules to escape at once, thus speeding up evaporation.
- Air Movement:
- Wind or air currents can carry away water vapour, allowing more liquid water to evaporate.
Examples of Evaporation
- Puddles Drying:
- After rain, puddles disappear as the water evaporates into the air.
- Sweating:
- When we sweat, the moisture on our skin evaporates, helping to cool our body.
In summary, evaporation is a vital process that transforms liquid water into water vapour, driven by heat and conditions that facilitate the transition from liquid to gas.
What is the process of changing liquid water into water vapor called?- a)Freezing
- b)Condensation
- c)Evaporation
- d)Melting
Correct answer is option 'C'. Can you explain this answer?
a)
Freezing
b)
Condensation
c)
Evaporation
d)
Melting
|
Kds Coaching answered |
Evaporation is the process where liquid water changes into vapor due to heat.
What is the main reason we feel cooler under a fan?- a)The fan lowers room temperature
- b)The moving air increases evaporation of sweat
- c)The fan absorbs heat
- d)The fan creates wind chills
Correct answer is option 'B'. Can you explain this answer?
What is the main reason we feel cooler under a fan?
a)
The fan lowers room temperature
b)
The moving air increases evaporation of sweat
c)
The fan absorbs heat
d)
The fan creates wind chills
|
Vp Classes answered |
The fan accelerates the evaporation of sweat from the skin, removing heat and making us feel cooler.
Which state of water is invisible?- a)Ice
- b)Liquid water
- c)Water vapour
- d)Dew
Correct answer is option 'C'. Can you explain this answer?
a)
Ice
b)
Liquid water
c)
Water vapour
d)
Dew
|
Keystone Instructors answered |
Water vapour is the gaseous form of water and is invisible.
What makes up most of our bodies and Earth’s surface?- a)Soil
- b)Water
- c)Air
- d)Rocks
Correct answer is option 'B'. Can you explain this answer?
a)
Soil
b)
Water
c)
Air
d)
Rocks
|
|
Kds Coaching answered |
Water covers most of the Earth and is essential for all living beings to survive.
What happens when water is cooled?- a)It turns into steam
- b)It remains the same
- c)It turns into ice
- d)It disappears
Correct answer is option 'C'. Can you explain this answer?
a)
It turns into steam
b)
It remains the same
c)
It turns into ice
d)
It disappears
|
|
Kds Coaching answered |
Cooling water below 0°C causes it to freeze and turn into ice.
Why do water droplets form on a cold bottle taken out of the fridge?- a)Water seeps out of the bottle
- b)The bottle releases cold water
- c)Water vapor in the air condenses on the cold surface
- d)The bottle absorbs water from its surroundings
Correct answer is option 'C'. Can you explain this answer?
Why do water droplets form on a cold bottle taken out of the fridge?
a)
Water seeps out of the bottle
b)
The bottle releases cold water
c)
Water vapor in the air condenses on the cold surface
d)
The bottle absorbs water from its surroundings
|
Charvi Pillai answered |
Understanding Condensation
When a cold bottle is taken out of the fridge, water droplets form on its surface due to a process called condensation. Here’s how it works:
Humidity in the Air
- The air around us contains water vapor, which is invisible moisture.
- This water vapor exists in varying amounts depending on the humidity level in the environment.
Temperature Difference
- When the cold bottle is removed from the fridge, its surface temperature is significantly lower than the surrounding air.
- As warm air comes into contact with the cold surface of the bottle, the temperature of that air decreases.
Condensation Process
- Cooler air can hold less moisture than warm air.
- When the warm, humid air touches the cold bottle, it cools down rapidly.
- As the air cools, it loses its ability to hold moisture, causing the excess water vapor to change from a gas to a liquid.
Formation of Water Droplets
- This process creates tiny water droplets that accumulate on the surface of the bottle.
- Initially, these droplets are small and can merge to form larger drops, which eventually run down the sides of the bottle.
Conclusion
In summary, the correct answer is option 'C': water vapor in the air condenses on the cold surface of the bottle. This is a simple yet fascinating example of how temperature and humidity interact in our environment.
When a cold bottle is taken out of the fridge, water droplets form on its surface due to a process called condensation. Here’s how it works:
Humidity in the Air
- The air around us contains water vapor, which is invisible moisture.
- This water vapor exists in varying amounts depending on the humidity level in the environment.
Temperature Difference
- When the cold bottle is removed from the fridge, its surface temperature is significantly lower than the surrounding air.
- As warm air comes into contact with the cold surface of the bottle, the temperature of that air decreases.
Condensation Process
- Cooler air can hold less moisture than warm air.
- When the warm, humid air touches the cold bottle, it cools down rapidly.
- As the air cools, it loses its ability to hold moisture, causing the excess water vapor to change from a gas to a liquid.
Formation of Water Droplets
- This process creates tiny water droplets that accumulate on the surface of the bottle.
- Initially, these droplets are small and can merge to form larger drops, which eventually run down the sides of the bottle.
Conclusion
In summary, the correct answer is option 'C': water vapor in the air condenses on the cold surface of the bottle. This is a simple yet fascinating example of how temperature and humidity interact in our environment.
What happens during condensation?- a)Water vapour changes into liquid water.
- b)Ice melts into liquid water.
- c)Liquid water changes into ice.
- d)Water boils and turns into steam.
Correct answer is option 'A'. Can you explain this answer?
a)
Water vapour changes into liquid water.
b)
Ice melts into liquid water.
c)
Liquid water changes into ice.
d)
Water boils and turns into steam.
|
Dr Manju Sen answered |
During condensation, water vapour loses heat and changes into liquid water.
Which of the following is NOT a state of water?- a)Solid
- b)Plasma
- c)Liquid
- d)Gas
Correct answer is option 'B'. Can you explain this answer?
a)
Solid
b)
Plasma
c)
Liquid
d)
Gas
|
|
Kds Coaching answered |
Water exists in three states—solid (ice), liquid (water), and gas (water vapor). Plasma is not a state of water.
Which factor increases the rate of evaporation?- a)Lower temperature
- b)Higher humidity
- c)Larger surface area
- d)Less airflow
Correct answer is option 'C'. Can you explain this answer?
a)
Lower temperature
b)
Higher humidity
c)
Larger surface area
d)
Less airflow
|
|
Sneha Rane answered |
Understanding Evaporation
Evaporation is the process where liquid turns into vapor. Several factors influence the rate of evaporation, and one of the most significant is the surface area of the liquid.
Why Larger Surface Area Increases Evaporation
- More Molecules Exposed: When the surface area of a liquid is larger, more molecules are exposed to the air. This means that more molecules have the opportunity to escape into the vapor phase.
- Greater Energy Absorption: A larger surface area allows for more energy absorption from the surrounding environment. This additional energy helps more molecules reach the necessary speed to break free from the liquid.
- Enhanced Interaction with Air: With a larger area, there’s an increased interaction between the liquid and the air. This leads to a greater chance of molecules transitioning into vapor.
Comparison with Other Factors
- Lower Temperature: Lower temperatures reduce the kinetic energy of molecules, leading to slower evaporation rates.
- Higher Humidity: Increased humidity means the air is already saturated with water vapor, which slows down the evaporation process as fewer molecules can escape into the air.
- Less Airflow: While airflow can enhance evaporation by moving vapor away from the liquid surface, it does not compensate for the lack of surface area.
In summary, having a larger surface area significantly increases the rate of evaporation by allowing more molecules to escape into the air, making it a key factor in this process.
Evaporation is the process where liquid turns into vapor. Several factors influence the rate of evaporation, and one of the most significant is the surface area of the liquid.
Why Larger Surface Area Increases Evaporation
- More Molecules Exposed: When the surface area of a liquid is larger, more molecules are exposed to the air. This means that more molecules have the opportunity to escape into the vapor phase.
- Greater Energy Absorption: A larger surface area allows for more energy absorption from the surrounding environment. This additional energy helps more molecules reach the necessary speed to break free from the liquid.
- Enhanced Interaction with Air: With a larger area, there’s an increased interaction between the liquid and the air. This leads to a greater chance of molecules transitioning into vapor.
Comparison with Other Factors
- Lower Temperature: Lower temperatures reduce the kinetic energy of molecules, leading to slower evaporation rates.
- Higher Humidity: Increased humidity means the air is already saturated with water vapor, which slows down the evaporation process as fewer molecules can escape into the air.
- Less Airflow: While airflow can enhance evaporation by moving vapor away from the liquid surface, it does not compensate for the lack of surface area.
In summary, having a larger surface area significantly increases the rate of evaporation by allowing more molecules to escape into the air, making it a key factor in this process.
Why do clothes dry faster on a windy day?- a)Because the temperature is higher
- b)Because the increased air movement speeds up evaporation
- c)Because the air is colder
- d)Because water freezes faster
Correct answer is option 'B'. Can you explain this answer?
Why do clothes dry faster on a windy day?
a)
Because the temperature is higher
b)
Because the increased air movement speeds up evaporation
c)
Because the air is colder
d)
Because water freezes faster
|
Shiksha Academy answered |
On a windy day, the moving air helps to carry away the moisture (water vapour) from the clothes, allowing more water to evaporate quickly. This makes clothes dry faster compared to when there is no wind.
Why do water droplets form on a cold bottle taken out of the fridge?- a)The bottle releases water
- b)The air around the bottle cools down and turns into liquid
- c)Water vapor in the air condenses on the bottle’s surface
- d)The bottle absorbs humidity from the air
Correct answer is option 'C'. Can you explain this answer?
a)
The bottle releases water
b)
The air around the bottle cools down and turns into liquid
c)
Water vapor in the air condenses on the bottle’s surface
d)
The bottle absorbs humidity from the air
|
|
Kds Coaching answered |
Water vapor in the air cools and condenses into liquid droplets on the cold bottle.
What is the process of water changing from gas to liquid called?- a)Evaporation
- b)Condensation
- c)Freezing
- d)Melting
Correct answer is option 'B'. Can you explain this answer?
a)
Evaporation
b)
Condensation
c)
Freezing
d)
Melting
|
|
Kds Coaching answered |
Condensation is the process where water vapor turns into liquid droplets.
What is the primary reason that air containing water vapor rises in the atmosphere?- a)It is cooler than the surrounding air.
- b)It is lighter than the surrounding air.
- c)It contains more oxygen than air without water vapor.
- d)It is denser than the surrounding air.
Correct answer is option 'B'. Can you explain this answer?
What is the primary reason that air containing water vapor rises in the atmosphere?
a)
It is cooler than the surrounding air.
b)
It is lighter than the surrounding air.
c)
It contains more oxygen than air without water vapor.
d)
It is denser than the surrounding air.
|
Neha Mehta answered |
Why Does Water Vapor-Rich Air Rise?
Air containing water vapor rises primarily because it is lighter than the surrounding air. Here’s a detailed explanation:
Understanding Air Composition
- Air is made up of various gases, including nitrogen, oxygen, and water vapor.
- Water vapor is less dense than the other gases present in the atmosphere, particularly nitrogen and oxygen.
Density and Buoyancy
- When air contains water vapor, it becomes less dense overall.
- The molecular weight of water (H2O) is lower than that of the nitrogen (N2) and oxygen (O2) molecules that make up the majority of the atmosphere.
- This lower density creates a buoyant force, allowing the water vapor-laden air to rise.
Convection Process
- As the lighter, warmer air rises, it leads to a process known as convection.
- This rising air can cool and condense, forming clouds, which can eventually lead to precipitation.
Conclusion
- In summary, the primary reason that air containing water vapor rises is that it is lighter (less dense) than the surrounding air.
- This property plays a crucial role in weather patterns and the formation of clouds.
Understanding these basic principles of atmospheric science helps explain many weather phenomena we observe in our daily lives!
Air containing water vapor rises primarily because it is lighter than the surrounding air. Here’s a detailed explanation:
Understanding Air Composition
- Air is made up of various gases, including nitrogen, oxygen, and water vapor.
- Water vapor is less dense than the other gases present in the atmosphere, particularly nitrogen and oxygen.
Density and Buoyancy
- When air contains water vapor, it becomes less dense overall.
- The molecular weight of water (H2O) is lower than that of the nitrogen (N2) and oxygen (O2) molecules that make up the majority of the atmosphere.
- This lower density creates a buoyant force, allowing the water vapor-laden air to rise.
Convection Process
- As the lighter, warmer air rises, it leads to a process known as convection.
- This rising air can cool and condense, forming clouds, which can eventually lead to precipitation.
Conclusion
- In summary, the primary reason that air containing water vapor rises is that it is lighter (less dense) than the surrounding air.
- This property plays a crucial role in weather patterns and the formation of clouds.
Understanding these basic principles of atmospheric science helps explain many weather phenomena we observe in our daily lives!
Why do clothes dry faster on a windy day?- a)Wind helps remove moisture faster
- b)Wind cools down the clothes
- c)Wind adds heat to the clothes
- d)Wind prevents water from evaporating
Correct answer is option 'A'. Can you explain this answer?
a)
Wind helps remove moisture faster
b)
Wind cools down the clothes
c)
Wind adds heat to the clothes
d)
Wind prevents water from evaporating
|
|
Kds Coaching answered |
Wind increases air movement, which speeds up evaporation and helps dry clothes faster.
What happens to water when sprinkled on a hot pan?- a)It freezes into ice
- b)It evaporates into water vapor
- c)It condenses into water droplets
- d)It remains the same
Correct answer is option 'B'. Can you explain this answer?
What happens to water when sprinkled on a hot pan?
a)
It freezes into ice
b)
It evaporates into water vapor
c)
It condenses into water droplets
d)
It remains the same
|
EduRev Class 6 answered |
When water is sprinkled on a hot surface, it heats up and turns into steam (water vapor) due to evaporation.
What does an Atmospheric Water Generator (AWG) machine do?- a)Turns water into vapor
- b)Produces water by cooling air and condensing vapor
- c)Heats water for drinking
- d)Cleans polluted water
Correct answer is option 'B'. Can you explain this answer?
What does an Atmospheric Water Generator (AWG) machine do?
a)
Turns water into vapor
b)
Produces water by cooling air and condensing vapor
c)
Heats water for drinking
d)
Cleans polluted water
|
|
Vp Classes answered |
An AWG machine collects moisture from humid air by cooling it, causing water vapor to condense into liquid water.
Why is water important for living beings?- a)It helps in digestion and keeping the body cool
- b)It provides oxygen for breathing
- c)It is used only for washing and cooking
- d)It has no major role in survival
Correct answer is option 'A'. Can you explain this answer?
a)
It helps in digestion and keeping the body cool
b)
It provides oxygen for breathing
c)
It is used only for washing and cooking
d)
It has no major role in survival
|
|
Kds Coaching answered |
Water helps in digestion, regulates body temperature, and is essential for all life processes.
What is the cooling effect of evaporation?- a)It makes the surroundings hotter
- b)It absorbs heat and makes the surroundings cooler
- c)It changes the color of water
- d)It turns water into ice
Correct answer is option 'B'. Can you explain this answer?
a)
It makes the surroundings hotter
b)
It absorbs heat and makes the surroundings cooler
c)
It changes the color of water
d)
It turns water into ice
|
Dishani Pillai answered |
The Cooling Effect of Evaporation
Evaporation is a natural process that occurs when liquid turns into vapor. This process plays a crucial role in cooling the surroundings.
How Evaporation Works
- When water evaporates, molecules at the surface gain enough energy to break free from the liquid state and enter the air as gas.
- This energy is taken from the water itself, resulting in a decrease in the temperature of the water.
Heat Absorption
- During evaporation, heat energy is absorbed from the surrounding environment.
- This process is why sweating cools our skin; as sweat evaporates, it absorbs heat from our body, making us feel cooler.
Examples of Cooling Effect
- Sweating: When we sweat, the moisture on our skin evaporates, cooling us down.
- Cooling of Water Bodies: Large bodies of water, like lakes and oceans, experience evaporation, which helps maintain cooler temperatures, especially during hot weather.
Conclusion
- Thus, evaporation effectively absorbs heat, leading to a cooler environment, which is why the correct answer is option 'B'.
- Understanding this concept helps us appreciate the role of evaporation in weather patterns and everyday life.
Evaporation is a natural process that occurs when liquid turns into vapor. This process plays a crucial role in cooling the surroundings.
How Evaporation Works
- When water evaporates, molecules at the surface gain enough energy to break free from the liquid state and enter the air as gas.
- This energy is taken from the water itself, resulting in a decrease in the temperature of the water.
Heat Absorption
- During evaporation, heat energy is absorbed from the surrounding environment.
- This process is why sweating cools our skin; as sweat evaporates, it absorbs heat from our body, making us feel cooler.
Examples of Cooling Effect
- Sweating: When we sweat, the moisture on our skin evaporates, cooling us down.
- Cooling of Water Bodies: Large bodies of water, like lakes and oceans, experience evaporation, which helps maintain cooler temperatures, especially during hot weather.
Conclusion
- Thus, evaporation effectively absorbs heat, leading to a cooler environment, which is why the correct answer is option 'B'.
- Understanding this concept helps us appreciate the role of evaporation in weather patterns and everyday life.
Which machine collects water from humid air and makes it drinkable?- a)Refrigerator
- b)Water cooler
- c)Atmospheric Water Generator (AWG)
- d)Air conditioner
Correct answer is option 'C'. Can you explain this answer?
a)
Refrigerator
b)
Water cooler
c)
Atmospheric Water Generator (AWG)
d)
Air conditioner
|
|
Kds Coaching answered |
An AWG extracts moisture from air and converts it into drinkable water.
What happens to water when it is sprinkled on a hot pan?- a)It turns into ice
- b)It becomes steam
- c)It disappears completely
- d)It remains unchanged
Correct answer is option 'B'. Can you explain this answer?
a)
It turns into ice
b)
It becomes steam
c)
It disappears completely
d)
It remains unchanged
|
|
Kds Coaching answered |
The heat of the pan converts water into steam, which is water in gaseous form.
Are ice and water the same substance?- a)No, they are different substances
- b)Yes, they are different forms of the same substance
- c)No, they are two separate elements
- d)Yes, but they have completely different properties
Correct answer is option 'B'. Can you explain this answer?
a)
No, they are different substances
b)
Yes, they are different forms of the same substance
c)
No, they are two separate elements
d)
Yes, but they have completely different properties
|
|
Kds Coaching answered |
Ice and water are both forms of the same substance, H₂O, but in different states (solid and liquid).
What is humidity?- a)The amount of water vapor in the air
- b)The temperature of water
- c)The pressure of water
- d)The amount of liquid water on the ground
Correct answer is option 'A'. Can you explain this answer?
a)
The amount of water vapor in the air
b)
The temperature of water
c)
The pressure of water
d)
The amount of liquid water on the ground
|
|
Kds Coaching answered |
Humidity measures how much water vapor is present in the air.
Which of the following is an example of a liquid state of water?- a)Ice
- b)Steam
- c)Water in a glass
- d)Snow
Correct answer is option 'C'. Can you explain this answer?
a)
Ice
b)
Steam
c)
Water in a glass
d)
Snow
|
|
Kds Coaching answered |
Water in a glass is in a liquid state as it flows and takes the shape of its container.
Chapter doubts & questions for A Journey through States of Water - Science for Class 6 2025 is part of Class 6 exam preparation. The chapters have been prepared according to the Class 6 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Class 6 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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