All Exams >
Class 6 >
Class 6 All Subjects (Old NCERT) >
All Questions
All questions of Air around Us for Class 6 Exam
Explain the following observations briefly:
An empty glass in fact is not empty.
- a)Filled with water
- b)Filled with air
- c)Not empty
- d)Empty
Correct answer is option 'B'. Can you explain this answer?
Explain the following observations briefly:
An empty glass in fact is not empty.
An empty glass in fact is not empty.
a)
Filled with water
b)
Filled with air
c)
Not empty
d)
Empty
|
Anita Menon answered |
The glass which is empty is actually filled with air. And because air takes up space when an empty glass is inverted and inserted into a trough filled with water, the air is trapped within and it is no anyway for air to escape out.
Atmospheric pressure _____________ with height.- a)Increase
- b)Decrease
- c)Depends upon season
- d)Remain same
Correct answer is option 'B'. Can you explain this answer?
Atmospheric pressure _____________ with height.
a)
Increase
b)
Decrease
c)
Depends upon season
d)
Remain same
|
Prasad Chawla answered |
Atmospheric pressure decrease with height due to decrease in density of air.
Which of the following processes need oxygen?- a)Combustion
- b)Respiration
- c)Oxidation
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
Which of the following processes need oxygen?
a)
Combustion
b)
Respiration
c)
Oxidation
d)
All of the above
|
Manasa Chauhan answered |
Oxygen is necessary for combustion, respiration and oxidation.
Which of the following can show the direction of the wind?
- a)An anemometer
- b)A wind mill
- c)A windvane
- d)A barometer
Correct answer is option 'C'. Can you explain this answer?
Which of the following can show the direction of the wind?
a)
An anemometer
b)
A wind mill
c)
A windvane
d)
A barometer
|
Anshu Nambiar answered |
A wind vane is used to find the direction of the wind.
An anemometer is an instrument that measures wind speed and wind pressure
A barometer is a tool used to measure atmospheric pressure,
An anemometer is an instrument that measures wind speed and wind pressure
A barometer is a tool used to measure atmospheric pressure,
Density of air ____________ with height.- a)Increase
- b)Remain same
- c)Decrease
- d)Fist increase than decrease
Correct answer is option 'C'. Can you explain this answer?
Density of air ____________ with height.
a)
Increase
b)
Remain same
c)
Decrease
d)
Fist increase than decrease
|
Subham Verma answered |
Density of air decrease with height as we move upwards.
Which of the following is combustible?- a)Oxygen
- b)Carbon dioxide
- c)Hydrogen
- d)All of these
Correct answer is option 'C'. Can you explain this answer?
Which of the following is combustible?
a)
Oxygen
b)
Carbon dioxide
c)
Hydrogen
d)
All of these
|
Nilanjan Unni answered |
Combustibility is the ability of a substance to burn or ignite when exposed to a flame or heat source. Among the given options, hydrogen is the only substance that is combustible. Let's explore why hydrogen is combustible and why the other options are not.
1. Hydrogen:
Hydrogen is a highly flammable gas and is considered combustible. It has a low ignition energy, meaning it can easily ignite and burn in the presence of a spark or flame. When hydrogen combines with oxygen (in the air), it forms an explosive mixture that can be easily ignited. This reaction is highly exothermic, releasing a large amount of heat energy.
2. Oxygen:
Oxygen is not combustible. It is a non-flammable gas that supports combustion. This means that oxygen is necessary for other substances to burn, but it does not burn itself. Oxygen supports combustion by reacting with combustible materials, such as fuels, to produce heat and light. It acts as an oxidizer, allowing other substances to burn more readily.
3. Carbon dioxide:
Carbon dioxide is not combustible. It is a non-flammable gas that does not support combustion. Carbon dioxide does not react with heat or flame, and it does not burn. In fact, carbon dioxide is often used as a fire extinguisher because it displaces oxygen and removes the necessary component for combustion.
4. All of these:
The correct answer is option 'C' - Hydrogen. Only hydrogen is combustible among the given options. Oxygen and carbon dioxide are non-combustible gases.
1. Hydrogen:
Hydrogen is a highly flammable gas and is considered combustible. It has a low ignition energy, meaning it can easily ignite and burn in the presence of a spark or flame. When hydrogen combines with oxygen (in the air), it forms an explosive mixture that can be easily ignited. This reaction is highly exothermic, releasing a large amount of heat energy.
2. Oxygen:
Oxygen is not combustible. It is a non-flammable gas that supports combustion. This means that oxygen is necessary for other substances to burn, but it does not burn itself. Oxygen supports combustion by reacting with combustible materials, such as fuels, to produce heat and light. It acts as an oxidizer, allowing other substances to burn more readily.
3. Carbon dioxide:
Carbon dioxide is not combustible. It is a non-flammable gas that does not support combustion. Carbon dioxide does not react with heat or flame, and it does not burn. In fact, carbon dioxide is often used as a fire extinguisher because it displaces oxygen and removes the necessary component for combustion.
4. All of these:
The correct answer is option 'C' - Hydrogen. Only hydrogen is combustible among the given options. Oxygen and carbon dioxide are non-combustible gases.
Gases and fine dust particle together make the- a)Carbon dioxide
- b)Water vapour
- c)Carbon monoxide
- d)Smoke
Correct answer is option 'D'. Can you explain this answer?
Gases and fine dust particle together make the
a)
Carbon dioxide
b)
Water vapour
c)
Carbon monoxide
d)
Smoke
|
Aditi Roy answered |
Gases and dust particle together make the smoke. Smoke starts from burning substances.
Finer hair inside the nose- a)Filter the microbes
- b)Prevent the water vapour
- c)Prevent the carbon dioxide gas
- d)Filter the dust particle
Correct answer is option 'D'. Can you explain this answer?
Finer hair inside the nose
a)
Filter the microbes
b)
Prevent the water vapour
c)
Prevent the carbon dioxide gas
d)
Filter the dust particle
|
Tanishq Dasgupta answered |
Finer hairs inside the nose filter the dust particle while inhaling the air.
Moisture in air is called- a)Atmosphere
- b)Humidity
- c)Water vapour
- d)Respiration
Correct answer is option 'B'. Can you explain this answer?
Moisture in air is called
a)
Atmosphere
b)
Humidity
c)
Water vapour
d)
Respiration
|
Yashvi Choudhary answered |
The quantity of water vapour present in air is called as humidity.
The correct ascending order of gases as per their composition in air is
- a)oxygen < carbon dioxide < nitrogen.
- b)hydrogen < oxygen < nitrogen.
- c)nitrogen < hydrogen < oxygen.
- d)oxygen < carbon dioxide < hydrogen.
Correct answer is option 'B'. Can you explain this answer?
The correct ascending order of gases as per their composition in air is
a)
oxygen < carbon dioxide < nitrogen.
b)
hydrogen < oxygen < nitrogen.
c)
nitrogen < hydrogen < oxygen.
d)
oxygen < carbon dioxide < hydrogen.
|
Nilotpal Iyer answered |
The correct ascending order of gases as per their composition in air is: hydrogen < oxygen < nitrogen.
How can you demonstrate that air occupies space?- a)By heating a closed container
- b)By placing a dry sponge in water
- c)By dipping an inverted bottle into water
- d)By observing dust particles in sunlight
Correct answer is option 'C'. Can you explain this answer?
a)
By heating a closed container
b)
By placing a dry sponge in water
c)
By dipping an inverted bottle into water
d)
By observing dust particles in sunlight
|
EduRev Class 6 answered |
Dipping an inverted bottle into water shows that air occupies space. When the bottle is submerged, the air inside the bottle prevents water from entering, creating bubbles as the air escapes. This simple demonstration effectively proves that air takes up space and cannot be seen but occupies volume.
The layer of air around the earth surface is called- a)Hydrosphere
- b)Lithosphere
- c)Atmosphere
- d)Stratosphere
Correct answer is option 'C'. Can you explain this answer?
The layer of air around the earth surface is called
a)
Hydrosphere
b)
Lithosphere
c)
Atmosphere
d)
Stratosphere
|
Saikat Rane answered |
Atmosphere
The layer of air around the Earth's surface is called the atmosphere. It is a crucial component of the Earth's system and plays a vital role in sustaining life on our planet. Let's delve deeper into the details of the Earth's atmosphere.
Composition of the Atmosphere
- The Earth's atmosphere is primarily composed of nitrogen (about 78%) and oxygen (about 21%).
- Other gases such as carbon dioxide, argon, and water vapor make up the remaining 1%.
Layers of the Atmosphere
- The atmosphere is divided into five main layers: the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
- Each layer has distinct characteristics and plays a specific role in regulating temperature and weather patterns on Earth.
Functions of the Atmosphere
- The atmosphere helps regulate the Earth's temperature by trapping heat from the sun and preventing it from escaping into space.
- It also protects the Earth's surface from harmful solar radiation and cosmic rays.
- The atmosphere is essential for the water cycle, as it enables the formation of clouds and precipitation.
Conclusion
In conclusion, the atmosphere is a crucial layer of air surrounding the Earth that sustains life and regulates the planet's climate. Understanding the composition and functions of the atmosphere is essential for comprehending the Earth's interconnected systems and how they impact our daily lives.
The layer of air around the Earth's surface is called the atmosphere. It is a crucial component of the Earth's system and plays a vital role in sustaining life on our planet. Let's delve deeper into the details of the Earth's atmosphere.
Composition of the Atmosphere
- The Earth's atmosphere is primarily composed of nitrogen (about 78%) and oxygen (about 21%).
- Other gases such as carbon dioxide, argon, and water vapor make up the remaining 1%.
Layers of the Atmosphere
- The atmosphere is divided into five main layers: the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
- Each layer has distinct characteristics and plays a specific role in regulating temperature and weather patterns on Earth.
Functions of the Atmosphere
- The atmosphere helps regulate the Earth's temperature by trapping heat from the sun and preventing it from escaping into space.
- It also protects the Earth's surface from harmful solar radiation and cosmic rays.
- The atmosphere is essential for the water cycle, as it enables the formation of clouds and precipitation.
Conclusion
In conclusion, the atmosphere is a crucial layer of air surrounding the Earth that sustains life and regulates the planet's climate. Understanding the composition and functions of the atmosphere is essential for comprehending the Earth's interconnected systems and how they impact our daily lives.
What happens to the air in a sealed container when heated?- a)It turns into water vapour
- b)It expands and exerts more pressure
- c)It condenses into liquid
- d)It becomes invisible
Correct answer is option 'B'. Can you explain this answer?
a)
It turns into water vapour
b)
It expands and exerts more pressure
c)
It condenses into liquid
d)
It becomes invisible
|
Keystone Instructors answered |
When air in a sealed container is heated, it expands and exerts more pressure. This is because heating causes the air molecules to move faster and spread out, increasing the volume and pressure within the container. This principle is used in various applications, including hot air balloons and pressure cookers.
Which gas in the air is a major contributor to the greenhouse effect?- a)Nitrogen
- b)Oxygen
- c)Carbon dioxide
- d)Water vapour
Correct answer is option 'C'. Can you explain this answer?
a)
Nitrogen
b)
Oxygen
c)
Carbon dioxide
d)
Water vapour
|
Dr Manju Sen answered |
Carbon dioxide is a major contributor to the greenhouse effect. It traps heat in the Earth's atmosphere, leading to global warming. Carbon dioxide levels have increased due to human activities such as burning fossil fuels and deforestation, impacting the climate and environment.
Winnowing is used to separate- a)Iron form other metals
- b)Seeds from fruits
- c)Grain form husk
- d)Sand from rice
Correct answer is option 'C'. Can you explain this answer?
Winnowing is used to separate
a)
Iron form other metals
b)
Seeds from fruits
c)
Grain form husk
d)
Sand from rice
|
Harshad Shah answered |
Winnowing is used to separate grains from husk due to difference in their density.
Which of the following statements is true regarding the earth's atmosphere?- a)It gets denser with an increase in the altitude.
- b)It gets thinner with an increase in the altitude.
- c)It remains the same.
- d)It contains no solid particles.
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements is true regarding the earth's atmosphere?
a)
It gets denser with an increase in the altitude.
b)
It gets thinner with an increase in the altitude.
c)
It remains the same.
d)
It contains no solid particles.
|
Keerthana Gupta answered |
The density of air decreases with an increase in altitude.
Breathing of air through our mouth is not hygienic because- a)dust particles will enter our lungs.
- b)we will inhale more carbon dioxide.
- c)our throat will become sore.
- d)we will easily catch cold.
Correct answer is option 'A'. Can you explain this answer?
Breathing of air through our mouth is not hygienic because
a)
dust particles will enter our lungs.
b)
we will inhale more carbon dioxide.
c)
our throat will become sore.
d)
we will easily catch cold.
|
Ameya Choudhury answered |
If we breathe air through our mouth, the dust particles present in the air may enter the lungs and cause harm. But if the nose is used for breathing, the hair present in the nose filters the air and prevents the dust particles from entering the lungs.
When we heat water, we find bubbles coming from it. This shows that- a)water contains air.
- b)air contains water.
- c)water itself converts into bubbles.
- d)water contains dissolved minerals.
Correct answer is option 'A'. Can you explain this answer?
When we heat water, we find bubbles coming from it. This shows that
a)
water contains air.
b)
air contains water.
c)
water itself converts into bubbles.
d)
water contains dissolved minerals.
|
Sanskriti Tiwari answered |
Water contains dissolved air. Note: Sol ability of gases decreases on increase of temperature.
Plants require nitrogen for- a)reproduction.
- b)photosynthesis.
- c)transpiration.
- d)their growth.
Correct answer is option 'D'. Can you explain this answer?
Plants require nitrogen for
a)
reproduction.
b)
photosynthesis.
c)
transpiration.
d)
their growth.
|
Rajveer Verma answered |
Plants require nitrogen for their growth and for the formation of proteins.
Which of the constituents of air on increasing, causes global warming?- a)Nitrogen
- b)Oxygen
- c)Inert gases
- d)Carbon dioxide
Correct answer is option 'D'. Can you explain this answer?
Which of the constituents of air on increasing, causes global warming?
a)
Nitrogen
b)
Oxygen
c)
Inert gases
d)
Carbon dioxide
|
Preethi Basak answered |
Carbon dioxide traps the reflected rays of the sun that fall on the earth's surface. This results in the increase of the earth's temperature, which is referred as global warming.
The percentage of nitrogen in air is- a)21%
- b)0.1%
- c)54%
- d)78%
Correct answer is option 'D'. Can you explain this answer?
The percentage of nitrogen in air is
a)
21%
b)
0.1%
c)
54%
d)
78%
|
Aman Choudhury answered |
The correct answer is option 'D' which states that the percentage of nitrogen in air is 78%. Let's understand why this is the correct answer.
**Introduction:**
Air is a mixture of various gases, with the two most abundant gases being nitrogen and oxygen. Nitrogen is an essential component of the Earth's atmosphere and plays a crucial role in supporting life on Earth.
**Composition of Air:**
Air is composed of several gases, including nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. The exact composition of air can vary slightly depending on location and other factors, but on average, the composition is as follows:
- Nitrogen (N₂): Approximately 78%
- Oxygen (O₂): Approximately 21%
- Carbon Dioxide (CO₂): Approximately 0.04%
- Trace Gases (Argon, Neon, Methane, etc.): Approximately 1%
**Explanation:**
Nitrogen gas (N₂) makes up the majority of the Earth's atmosphere, accounting for approximately 78% of the total volume of air. This means that out of every 100 units of air, around 78 units are nitrogen gas.
Oxygen gas (O₂) is the second most abundant gas in the atmosphere, making up approximately 21% of the total volume of air. This accounts for the remaining percentage of air composition.
The other gases present in the atmosphere, such as carbon dioxide (CO₂) and trace gases like argon and methane, make up a very small percentage of the total composition, collectively accounting for approximately 1%.
**Conclusion:**
In conclusion, the correct answer is option 'D' which states that the percentage of nitrogen in air is 78%. This makes nitrogen the most abundant gas in the Earth's atmosphere, while oxygen is the second most abundant. Understanding the composition of air and the role of nitrogen is important in various scientific and environmental contexts.
**Introduction:**
Air is a mixture of various gases, with the two most abundant gases being nitrogen and oxygen. Nitrogen is an essential component of the Earth's atmosphere and plays a crucial role in supporting life on Earth.
**Composition of Air:**
Air is composed of several gases, including nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. The exact composition of air can vary slightly depending on location and other factors, but on average, the composition is as follows:
- Nitrogen (N₂): Approximately 78%
- Oxygen (O₂): Approximately 21%
- Carbon Dioxide (CO₂): Approximately 0.04%
- Trace Gases (Argon, Neon, Methane, etc.): Approximately 1%
**Explanation:**
Nitrogen gas (N₂) makes up the majority of the Earth's atmosphere, accounting for approximately 78% of the total volume of air. This means that out of every 100 units of air, around 78 units are nitrogen gas.
Oxygen gas (O₂) is the second most abundant gas in the atmosphere, making up approximately 21% of the total volume of air. This accounts for the remaining percentage of air composition.
The other gases present in the atmosphere, such as carbon dioxide (CO₂) and trace gases like argon and methane, make up a very small percentage of the total composition, collectively accounting for approximately 1%.
**Conclusion:**
In conclusion, the correct answer is option 'D' which states that the percentage of nitrogen in air is 78%. This makes nitrogen the most abundant gas in the Earth's atmosphere, while oxygen is the second most abundant. Understanding the composition of air and the role of nitrogen is important in various scientific and environmental contexts.
Which of the following gas is found in largest quantity in air?- a)Nitrogen
- b)Carbon dioxide
- c)Argon
- d)Oxygen
Correct answer is option 'A'. Can you explain this answer?
Which of the following gas is found in largest quantity in air?
a)
Nitrogen
b)
Carbon dioxide
c)
Argon
d)
Oxygen
|
|
Aditi Roy answered |
Nitrogen gas is found in largest quantity in air followed by oxygen gas.
The balance between carbon dioxide and oxygen is maintained by- a)Evaporation and photosynthesis
- b)Transpiration and respiration
- c)Photosynthesis and respiration
- d)Hydrogenation and combustion
Correct answer is option 'C'. Can you explain this answer?
The balance between carbon dioxide and oxygen is maintained by
a)
Evaporation and photosynthesis
b)
Transpiration and respiration
c)
Photosynthesis and respiration
d)
Hydrogenation and combustion
|
Jhanvi Banerjee answered |
The balance between carbon dioxide and oxygen is maintained by photosynthesis and respiration in which carbon dioxide and oxygen is used and oxygen and carbon dioxide is produced respectively.
How does dust affect the air quality?- a)It makes the air more humid
- b)It decreases the amount of oxygen
- c)It can make the air harmful to breathe
- d)It increases the air temperature
Correct answer is option 'C'. Can you explain this answer?
a)
It makes the air more humid
b)
It decreases the amount of oxygen
c)
It can make the air harmful to breathe
d)
It increases the air temperature
|
Manoj Iyer answered |
How does dust affect the air quality?
Dust particles in the air can have various negative effects on air quality, making it harmful to breathe and affecting overall environmental conditions.
1. Particulate matter:
- Dust particles can contribute to the formation of particulate matter in the air, which can be harmful when inhaled.
- Particulate matter can penetrate deep into the lungs and cause respiratory issues, especially in people with pre-existing conditions like asthma or lung disease.
2. Allergens:
- Dust can contain allergens like pollen, mold spores, and pet dander, which can worsen allergy symptoms and respiratory problems.
3. Air pollution:
- Dust can interact with other pollutants in the air, such as vehicle emissions and industrial pollutants, to form smog and other harmful compounds.
- This can lead to poor air quality, reduced visibility, and health problems for people exposed to the polluted air.
4. Climate change:
- Dust particles can also impact the Earth's climate by affecting the amount of sunlight that reaches the surface and contributing to the greenhouse effect.
- This can lead to changes in temperature patterns and weather conditions, affecting both human health and the environment.
In conclusion, dust can significantly degrade air quality by increasing levels of particulate matter, allergens, air pollution, and contributing to climate change. It is important to address sources of dust and take measures to improve air quality for the health and well-being of both humans and the environment.
Dust particles in the air can have various negative effects on air quality, making it harmful to breathe and affecting overall environmental conditions.
1. Particulate matter:
- Dust particles can contribute to the formation of particulate matter in the air, which can be harmful when inhaled.
- Particulate matter can penetrate deep into the lungs and cause respiratory issues, especially in people with pre-existing conditions like asthma or lung disease.
2. Allergens:
- Dust can contain allergens like pollen, mold spores, and pet dander, which can worsen allergy symptoms and respiratory problems.
3. Air pollution:
- Dust can interact with other pollutants in the air, such as vehicle emissions and industrial pollutants, to form smog and other harmful compounds.
- This can lead to poor air quality, reduced visibility, and health problems for people exposed to the polluted air.
4. Climate change:
- Dust particles can also impact the Earth's climate by affecting the amount of sunlight that reaches the surface and contributing to the greenhouse effect.
- This can lead to changes in temperature patterns and weather conditions, affecting both human health and the environment.
In conclusion, dust can significantly degrade air quality by increasing levels of particulate matter, allergens, air pollution, and contributing to climate change. It is important to address sources of dust and take measures to improve air quality for the health and well-being of both humans and the environment.
Mountaineers carry oxygen cylinders with them because- a)oxygen supports combustion.
- b)oxygen is less at higher altitudes.
- c)more oxygen is needed to cook food.
- d)oxygen does not support combustion.
Correct answer is option 'B'. Can you explain this answer?
Mountaineers carry oxygen cylinders with them because
a)
oxygen supports combustion.
b)
oxygen is less at higher altitudes.
c)
more oxygen is needed to cook food.
d)
oxygen does not support combustion.
|
|
Nilotpal Iyer answered |
The density of air decreases with altitude, so the oxygen needed for breathing also decreases and becomes difficult to breathe. Hence, mountaineers carry oxygen cylinders.
The humidity of a place- a)lies between 10% - 20%.
- b)is always more than 50%.
- c)is always less than 80%.
- d)varies from time to time.
Correct answer is option 'D'. Can you explain this answer?
The humidity of a place
a)
lies between 10% - 20%.
b)
is always more than 50%.
c)
is always less than 80%.
d)
varies from time to time.
|
Malavika Kulkarni answered |
Humidity varies from time to time and from place to place. It is not fixed because it depends on the temperature of that place at that particular time.
Which gas is most abundant in the air we breathe?- a)Carbon dioxide
- b)Oxygen
- c)Nitrogen
- d)Water vapour
Correct answer is option 'C'. Can you explain this answer?
a)
Carbon dioxide
b)
Oxygen
c)
Nitrogen
d)
Water vapour
|
|
Dr Manju Sen answered |
Nitrogen is the most abundant gas in the air, making up about 78% of the atmosphere. It is a major component of the air we breathe and is important for various biological processes, though it does not support combustion. Nitrogen acts as a buffer to prevent the air from becoming too reactive.
What is the primary function of the atmosphere surrounding the Earth?- a)To provide oxygen for burning
- b)To block harmful radiation from the sun
- c)To produce weather patterns
- d)To contain oxygen for respiration
Correct answer is option 'B'. Can you explain this answer?
a)
To provide oxygen for burning
b)
To block harmful radiation from the sun
c)
To produce weather patterns
d)
To contain oxygen for respiration
|
|
EduRev Class 6 answered |
The primary function of the Earth's atmosphere is to block harmful radiation from the sun, protecting living organisms from ultraviolet (UV) rays. It also helps in regulating temperature and supporting life by providing essential gases like oxygen. The atmosphere plays a critical role in maintaining the Earth's climate and weather systems.
Which of the following enables us to drink a liquid through a straw?
- a)Humidity
- b)Temperature
- c)Atmospheric pressure
- d)Composition of air
Correct answer is option 'C'. Can you explain this answer?
Which of the following enables us to drink a liquid through a straw?
a)
Humidity
b)
Temperature
c)
Atmospheric pressure
d)
Composition of air
|
Bhavana Bajaj answered |
When a straw is used for drinking, air is expelled out from the straw due to which there is a decrease in the air pressure inside the straw. Therefore, the liquid in the container enters the straw, rises up and comes out from the straw. So, we are able to drink the juice/liquid. When we stop using the straw the process stops.
What is the main role of oxygen in the atmosphere?- a)It helps in the formation of clouds
- b)It supports burning and respiration
- c)It makes air visible
- d)It helps in weather forecasting
Correct answer is option 'B'. Can you explain this answer?
a)
It helps in the formation of clouds
b)
It supports burning and respiration
c)
It makes air visible
d)
It helps in weather forecasting
|
Rahul Kumar answered |
Oxygen is essential for supporting burning (combustion) and respiration in living organisms. Without oxygen, fires would not burn and animals and plants could not survive. Oxygen is crucial for the processes that keep us and other living things alive. An interesting fact is that oxygen makes up about 21% of the Earth's atmosphere, which is just enough to sustain life.
Which gas in the air is used by plants for photosynthesis?- a)Nitrogen
- b)Oxygen
- c)Carbon dioxide
- d)Water vapour
Correct answer is option 'C'. Can you explain this answer?
a)
Nitrogen
b)
Oxygen
c)
Carbon dioxide
d)
Water vapour
|
Shiksha Academy answered |
Plants use carbon dioxide for photosynthesis, a process in which they convert carbon dioxide and sunlight into glucose and oxygen. This process is essential for plant growth and also helps maintain the balance of carbon dioxide and oxygen in the atmosphere.
Why do plants and animals depend on each other for gases in the atmosphere?- a)Plants produce carbon dioxide while animals produce oxygen
- b)Plants produce oxygen while animals produce carbon dioxide
- c)Plants consume nitrogen while animals consume oxygen
- d)Plants and animals use the same amount of all gases
Correct answer is option 'B'. Can you explain this answer?
a)
Plants produce carbon dioxide while animals produce oxygen
b)
Plants produce oxygen while animals produce carbon dioxide
c)
Plants consume nitrogen while animals consume oxygen
d)
Plants and animals use the same amount of all gases
|
|
Saikat Rane answered |
Plants and Animals Dependence on Each Other for Gases in the Atmosphere
Plants and animals have a mutual dependence on each other for gases in the atmosphere, primarily oxygen and carbon dioxide.
- Plants produce oxygen: Through the process of photosynthesis, plants take in carbon dioxide from the atmosphere and water from the soil to produce oxygen. This oxygen is released back into the atmosphere as a byproduct and is essential for the survival of animals, including humans.
- Animals produce carbon dioxide: Animals, including humans, take in oxygen from the atmosphere and release carbon dioxide through the process of respiration. This carbon dioxide is then used by plants during photosynthesis to produce oxygen, creating a continuous cycle of gas exchange between plants and animals.
This interdependence between plants and animals ensures a balance of gases in the atmosphere, allowing both to thrive. If this balance is disrupted, it can have detrimental effects on both plant and animal populations, as well as the overall health of the ecosystem.
Plants and animals have a mutual dependence on each other for gases in the atmosphere, primarily oxygen and carbon dioxide.
- Plants produce oxygen: Through the process of photosynthesis, plants take in carbon dioxide from the atmosphere and water from the soil to produce oxygen. This oxygen is released back into the atmosphere as a byproduct and is essential for the survival of animals, including humans.
- Animals produce carbon dioxide: Animals, including humans, take in oxygen from the atmosphere and release carbon dioxide through the process of respiration. This carbon dioxide is then used by plants during photosynthesis to produce oxygen, creating a continuous cycle of gas exchange between plants and animals.
This interdependence between plants and animals ensures a balance of gases in the atmosphere, allowing both to thrive. If this balance is disrupted, it can have detrimental effects on both plant and animal populations, as well as the overall health of the ecosystem.
What does a weather cock indicate?- a)The temperature of the air
- b)The direction of the wind
- c)The amount of dust in the air
- d)The level of humidity
Correct answer is option 'B'. Can you explain this answer?
a)
The temperature of the air
b)
The direction of the wind
c)
The amount of dust in the air
d)
The level of humidity
|
|
Rahul Kumar answered |
A weather cock (or weathervane) shows the direction in which the wind is blowing. It is a tool used to determine wind direction, which can help in weather forecasting and understanding local weather patterns. Wind direction is crucial for various weather-related applications.
The percentage of water vapour present in air is called- a)density.
- b)humidity.
- c)mass.
- d)solubility.
Correct answer is option 'B'. Can you explain this answer?
The percentage of water vapour present in air is called
a)
density.
b)
humidity.
c)
mass.
d)
solubility.
|
Abhijeet Choudhary answered |
The percentage of water vapour present in the air is called humidity.
Which of the following gases is present in the fire extinguishers- a)carbon dioxide.
- b)hydrogen.
- c)nitrogen.
- d)oxygen.
Correct answer is option 'A'. Can you explain this answer?
Which of the following gases is present in the fire extinguishers
a)
carbon dioxide.
b)
hydrogen.
c)
nitrogen.
d)
oxygen.
|
Subset Academy answered |
Carbon dioxide in the gas which is present in the fire extinguishers.
Which of the following plays a very important role in the oxygen cycle?- a)Birds
- b)Animals
- c)Plants
- d)Soil
Correct answer is option 'C'. Can you explain this answer?
Which of the following plays a very important role in the oxygen cycle?
a)
Birds
b)
Animals
c)
Plants
d)
Soil
|
|
Harshad Shah answered |
Plants play an important role in the oxygen cycle, as they release oxygen during the process of photosynthesis. Thus, they help in balancing the oxygen content in the atmosphere.
Air is useful for- a)generating electricity.
- b)the dispersal of seeds.
- c)bird's flight.
- d)all of the above.
Correct answer is option 'D'. Can you explain this answer?
Air is useful for
a)
generating electricity.
b)
the dispersal of seeds.
c)
bird's flight.
d)
all of the above.
|
|
Anshu Nambiar answered |
Air is useful in many ways, like in the generation of electricity, the dispersal of seeds and in bird's flight.
Which of the following statements is true regarding the properties of air?
- a)Air is a good conductor of electricity.
- b)Air is a good conductor of heat.
- c)Air is translucent
- d)The composition of air varies from place to place.
Correct answer is option 'D'. Can you explain this answer??
Which of the following statements is true regarding the properties of air?
a)
Air is a good conductor of electricity.
b)
Air is a good conductor of heat.
c)
Air is translucent
d)
The composition of air varies from place to place.
|
Swara Chakraborty answered |
Understanding the Properties of Air
Air is a mixture of various gases, primarily nitrogen and oxygen, along with trace amounts of other gases. Let's explore why option 'D' is the correct answer regarding the properties of air.
Air Composition Varies
- Variation in Composition: The composition of air can change based on several factors, including location, altitude, and environmental conditions. For instance:
- Urban areas may have higher levels of pollutants like carbon monoxide and sulfur dioxide.
- Coastal regions can have higher humidity levels, affecting the air's moisture content.
- High-altitude locations may have thinner air with reduced oxygen levels.
Other Statements Explained
- Good Conductor of Electricity:
- Air is generally not a good conductor of electricity. In fact, it is an insulator unless ionized (as in the case of lightning).
- Good Conductor of Heat:
- Air is a poor conductor of heat compared to solids and liquids. It is often used as an insulator (like in double-glazed windows) due to its low thermal conductivity.
- Translucent:
- Air itself is not translucent; rather, it is transparent. It allows light to pass through without scattering.
Conclusion
In conclusion, the correct answer is option 'D' as the composition of air varies from place to place due to environmental factors, human activity, and geographical differences. Understanding these properties helps us appreciate the complexities of the atmosphere surrounding us.
Air is a mixture of various gases, primarily nitrogen and oxygen, along with trace amounts of other gases. Let's explore why option 'D' is the correct answer regarding the properties of air.
Air Composition Varies
- Variation in Composition: The composition of air can change based on several factors, including location, altitude, and environmental conditions. For instance:
- Urban areas may have higher levels of pollutants like carbon monoxide and sulfur dioxide.
- Coastal regions can have higher humidity levels, affecting the air's moisture content.
- High-altitude locations may have thinner air with reduced oxygen levels.
Other Statements Explained
- Good Conductor of Electricity:
- Air is generally not a good conductor of electricity. In fact, it is an insulator unless ionized (as in the case of lightning).
- Good Conductor of Heat:
- Air is a poor conductor of heat compared to solids and liquids. It is often used as an insulator (like in double-glazed windows) due to its low thermal conductivity.
- Translucent:
- Air itself is not translucent; rather, it is transparent. It allows light to pass through without scattering.
Conclusion
In conclusion, the correct answer is option 'D' as the composition of air varies from place to place due to environmental factors, human activity, and geographical differences. Understanding these properties helps us appreciate the complexities of the atmosphere surrounding us.
Match the following terms in Column-l with those in Column-II correctly.
- a)a−1,b−2,c−3,d−4
- b)a−2,b−1,c−4,d−3
- c)a−3,b−4,c−1,d−2
- d)a−4,b−3,c−2,d−1
Correct answer is option 'D'. Can you explain this answer?
Match the following terms in Column-l with those in Column-II correctly.
a)
a−1,b−2,c−3,d−4
b)
a−2,b−1,c−4,d−3
c)
a−3,b−4,c−1,d−2
d)
a−4,b−3,c−2,d−1
|
|
Ameya Choudhury answered |
The correct combination is a - 4, b - 3, c - 2, d - 1
(i) Aquatic animals-Dissolved oxygen
(ii) Mountaineers-Oxygen cylinders
(iii) Factories-Soot and dust
(iv) Wind-Sail boat
(i) Aquatic animals-Dissolved oxygen
(ii) Mountaineers-Oxygen cylinders
(iii) Factories-Soot and dust
(iv) Wind-Sail boat
Which gas is responsible for rusting of iron when mixed with moisture?- a)Nitrogen
- b)Oxygen
- c)Hydrogen
- d)Carbon dioxide
Correct answer is option 'B'. Can you explain this answer?
Which gas is responsible for rusting of iron when mixed with moisture?
a)
Nitrogen
b)
Oxygen
c)
Hydrogen
d)
Carbon dioxide
|
Kds Coaching answered |
Rusting is an oxidation reaction where iron reacts with oxygen in the presence of water (moisture) to form iron oxide (rust). Oxygen is essential for this chemical change.
Chapter doubts & questions for Air around Us - Class 6 All Subjects (Old NCERT) 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.
Chapter doubts & questions of Air around Us - Class 6 All Subjects (Old NCERT) in English & Hindi are available as part of Class 6 exam.
Download more important topics, notes, lectures and mock test series for Class 6 Exam by signing up for free.
Class 6 All Subjects (Old NCERT)
297 videos|1066 docs|204 tests
|
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup