CBSE Class 6 Science Exemplar Chapter 15: Air Around Us NCERT Solutions
This chapter, 'Air Around Us,' for CBSE Class 6 Science Exemplar, delves into the fundamental properties and importance of air. The NCERT Solutions provide clear explanations for multiple-choice questions and practical scenarios. Students will learn about the presence of air everywhere, even in soil and water, and understand the role of wind in various phenomena like flying kites and rotating windmills. The solutions also clarify the composition of air, highlighting nitrogen as the most abundant gas, and discuss the harmful components like dust and smoke. Furthermore, the importance of oxygen for living beings and the challenges faced at high altitudes are explained. These solutions are designed to reinforce learning and aid students in preparing for their examinations by offering detailed, step-by-step explanations for each concept.
Quick info
| Board | CBSE |
|---|---|
| Class | Class 6 |
| Subject | Science Exemplar |
| Session | 2026 |
| Language | English |
| Type | NCERT Solutions |
| Chapter | Chapter 15 |
Chapter summary
Chapter 15, 'Air Around Us,' focuses on understanding the ubiquitous nature of air. The NCERT Solutions cover key concepts such as the presence of air in soil and water, the definition of wind, and its effects. It also explains the composition of air, emphasizing the significant percentage of nitrogen and oxygen, and identifies harmful components. The solutions address the necessity of oxygen for respiration and the implications of reduced oxygen at higher altitudes, providing a comprehensive overview for Class 6 students.
Learning outcomes
- Understand that air is present everywhere, including in soil and water.
- Identify the components of air and their relative proportions in the atmosphere.
- Explain the concept of wind and its effects on objects.
- Recognize the importance of air for living organisms, especially oxygen for breathing.
- Comprehend the challenges of breathing at high altitudes due to reduced oxygen.
- Identify harmful components present in the air.
Topics covered
Paper topics
- Presence of Air
- Air in Soil
- Air in Water
- Wind
- Movement of Objects by Wind
- Composition of Air
- Nitrogen
- Oxygen
- Carbon Dioxide
- Water Vapour
- Harmful Components of Air (Dust and Smoke)
- Air and Respiration
Important topics
- Presence of air in soil and water
- Composition of air (Nitrogen, Oxygen)
- Role of wind
- Importance of oxygen for breathing
- Harmful components of air
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Questions and Solutions
Multiple Choice Questions: 1
(a) All living things require air to breathe.
(b) We can feel air but we cannot see it.
(c) Moving air makes it possible to fly a kite.
(d) Air is present everywhere but not in soil.
The incorrect statement is (d) Air is present everywhere but not in soil.
Air is indeed present everywhere, including within the soil. This can be demonstrated by an activity: take a lump of dry soil in a beaker and add water. You will observe bubbles rising from the soil, which are air escaping as the water fills the spaces previously occupied by air.
Multiple Choice Questions: 2
(a) Firki
(b) Weathercock
(c) Ceiling fan
(d) Sailing yacht
The correct answer is (c) Ceiling fan.
A ceiling fan operates using electricity to rotate its blades. A firki (pinwheel), a weathercock, and a sailing yacht are all designed to be moved or directed by the force of the wind.
Multiple Choice Questions: 3
(a) It makes the windmill rotate.
(b) It helps in the movements of aeroplanes.
(c) Birds can fly due to presence of air.
(d) It has no role in water cycle.
The statement that is not true is (d) It has no role in water cycle.
Air plays a significant role in the water cycle. Water evaporates from the Earth's surface and rises into the atmosphere as water vapor, which is a component of air. These water vapors form clouds and eventually lead to precipitation, demonstrating air's crucial involvement in the water cycle.
Multiple Choice Questions: 4
(a) there is no oxygen on high mountains
(b) there is deficiency of oxygen on mountains at high altitude
(c) oxygen is used for cooking
(d) oxygen keeps them warm at low temperature.
The correct reason is (b) there is deficiency of oxygen on mountains at high altitude.
As one ascends to higher altitudes, the atmospheric pressure decreases, and the air becomes thinner. This means that the concentration of oxygen available for breathing is significantly reduced. Consequently, mountaineers carry supplementary oxygen cylinders to aid their breathing and prevent altitude sickness.
Question 5
- Bubbles of air came out from the bottle.
- Some water entered the bottle.
- Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water.
- No bubbles formed, only water entered the bottle.
- (i) and (ii)
- (iv) only
- (iii) and (iv)
- (i) only
The correct observations are (a): (i) and (ii).
When the bottle is dipped upside down in water, the air trapped inside prevents water from entering. Upon tilting the bottle, the trapped air escapes in the form of bubbles (observation i). As the air leaves, water can then enter the bottle to replace the volume previously occupied by air (observation ii). Observations (iii) and (iv) are incorrect; nitrogen and oxygen are components of air, but they don't selectively come out as described, and water does enter once air escapes.
Question 6
(a) Nitrogen
(b) Oxygen
(c) Water vapour
(d) Carbon dioxide
The component of air present in the largest amount is (a) Nitrogen.
The Earth's atmosphere is primarily composed of nitrogen, which accounts for approximately 78% of the air. Oxygen makes up about 21%, and the remaining 1% consists of other gases like carbon dioxide, water vapor, and trace amounts of other elements, along with dust particles.
Question 7
(a) nitrogen and carbon dioxide
(b) dust and water vapour
(c) dust and smoke
(d) smoke and water vapour.
The components of air that are harmful to living beings are (c) dust and smoke.
While nitrogen, oxygen, carbon dioxide, and water vapor are natural components of air, excessive amounts of dust and smoke act as pollutants. These particles can irritate the respiratory system, cause breathing difficulties, and have other adverse health effects on living organisms.
Common mistakes
- Assuming air is not present in soil or water.
- Confusing the role of wind with electrically powered devices.
- Underestimating the importance of air in natural processes like the water cycle.
- Not recognizing the reduced oxygen availability at high altitudes.
Revision tips
- Review the composition of air and the percentage of each gas.
- Focus on understanding the experiments that demonstrate the presence of air.
- Relate the concepts of wind and air pressure to everyday examples.
- Memorize the reasons why mountaineers carry oxygen cylinders.
- Pay attention to the distinction between useful and harmful components of air.
Practice MCQs
Q1. Which of the following statements about air is incorrect?
Explanation: The statement that air is not present in soil is incorrect. Air is present in the spaces between soil particles, which can be observed when water is added to dry soil, causing bubbles to rise.
Q2. Which of the following items does NOT rely on wind for its movement?
Explanation: A ceiling fan is powered by electricity and rotates independently of the wind. Firki, weathercocks, and sailing yachts are all designed to move or indicate direction based on the force of the wind.
Q3. Which of the following statements about air is NOT true?
Explanation: Air plays a crucial role in the water cycle. Water evaporates into the atmosphere as water vapor, forms clouds, and eventually returns as precipitation, all of which involve atmospheric air.
Q4. Why do mountaineers carry oxygen cylinders when climbing high mountains?
Explanation: As altitude increases, the atmosphere becomes thinner, meaning there is less oxygen available per unit volume of air. This makes breathing difficult, necessitating supplemental oxygen for mountaineers.
Q5. What is the most abundant component of air in the Earth's atmosphere?
Explanation: Nitrogen is the most abundant gas in the Earth's atmosphere, making up about 78% of the air. Oxygen constitutes about 21%, and the remaining 1% includes other gases like carbon dioxide, water vapor, and trace elements.
Q6. Which of the following are considered harmful components of air?
Explanation: Dust and smoke particles suspended in the air can be harmful to the respiratory system and overall health of living beings. While carbon dioxide and water vapor are natural components, excessive smoke and dust are pollutants.
Frequently asked questions
What is the main concept covered in CBSE Class 6 Science Exemplar Chapter 15?
Chapter 15, 'Air Around Us,' focuses on understanding that air is present everywhere, its composition (mainly nitrogen and oxygen), the concept of wind, and its importance for living beings, as well as identifying harmful air pollutants.
Are these NCERT Solutions for Class 6 Science Exemplar Chapter 15 accurate?
Yes, these solutions are carefully crafted to be accurate and align with the NCERT curriculum, providing clear and step-by-step explanations for all questions in Chapter 15.
How do these solutions help students understand the presence of air?
The solutions explain that air is present even in soil and water, often demonstrated through simple activities like adding water to soil, which releases trapped air bubbles. This helps students grasp the ubiquitous nature of air.
What is the role of wind explained in these solutions?
The solutions explain that wind is moving air and it helps in various activities such as flying kites, rotating windmills, and moving sailing yachts. It also helps in the movement of weathercocks.
Why is oxygen important according to the solutions?
Oxygen is a vital component of air that is essential for the breathing of all living things. The solutions also highlight that the amount of oxygen decreases at high altitudes, making it difficult to breathe.
What are the harmful components of air mentioned?
The solutions identify dust and smoke as harmful components present in the air. These can negatively impact the health of living beings.
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