Class 7 Exam > Class 7 Notes > Chemistry Class 7 ICSE > Worksheet: Air and Atmosphere
Worksheet: Air and Atmosphere | Chemistry Class 7 ICSE PDF Download
Part A: Multiple Choice Questions
Q1. Which gas makes up the largest proportion of air by volume?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Argon
Q2. Why is oxygen called the “breath of life”?
a) Because it is the lightest gas in air
b) Because it supports burning and respiration
c) Because it is used in making proteins
d) Because it is heavier than air
Q3. Which of the following proves that air is a mixture and not a compound?
a) Air has weight
b) Air contains dust particles
c) Air composition can vary from place to place
d) Air can dissolve in water
Q4. Which scientist discovered oxygen as a component of air?
a) Rutherford
b) Lavoisier
c) Black
d) Van Helmont
Q5. Which inert gas is filled in bulbs to prevent filament from burning?
a) Helium
b) Neon
c) Argon
d) Xenon
Part B: Short Answer Questions
Q6. Why is air considered matter?
Q7. State two differences between air as a mixture and a compound.
Q8. Why is nitrogen important for plants?
Q9. Why is oxygen collected by downward displacement of water in laboratories?
Q10. How does carbon dioxide help in extinguishing fire?
Part C: Long Answer Questions
Q11. Explain with steps why air is called a mixture and not a compound.
Q12. What are inert gases? Mention their properties and uses.
Q13. Explain the oxygen cycle in nature.
The document Worksheet: Air and Atmosphere | Chemistry Class 7 ICSE is a part of the Class 7 Course Chemistry Class 7 ICSE.
All you need of Class 7 at this link: Class 7
|
33 videos|58 docs|7 tests
|
FAQs on Worksheet: Air and Atmosphere - Chemistry Class 7 ICSE
| 1. What are the main components of air ? |  |
Ans. The main components of air are nitrogen (approximately 78%), oxygen (about 21%), argon (around 0.93%), carbon dioxide (about 0.04%), and trace amounts of other gases. Water vapor is also present in varying amounts, which can significantly affect air quality and weather conditions.
| 2. Why is the atmosphere important for living organisms ? | |
Ans. The atmosphere is crucial for living organisms as it provides the oxygen necessary for respiration. It also protects life on Earth by filtering harmful solar radiation, maintaining temperature through the greenhouse effect, and enabling weather and climate patterns that support diverse ecosystems.
| 3. How does air pollution affect the atmosphere ? | |
Ans. Air pollution introduces harmful substances into the atmosphere, which can lead to health problems in humans and animals, contribute to climate change, and cause damage to the environment. Pollutants like carbon monoxide, sulfur dioxide, and nitrogen oxides can lead to respiratory diseases and contribute to phenomena such as acid rain.
| 4. What are the layers of the atmosphere and their characteristics ? | |
Ans. The atmosphere consists of several layers:
1. Troposphere - where weather occurs and most of the air is found, extending up to about 12 km.
2. Stratosphere - home to the ozone layer, which absorbs and scatters ultraviolet solar radiation, extending from about 12 km to 50 km.
3. Mesosphere - where temperatures decrease with altitude, extending from 50 km to about 85 km.
4. Thermosphere - characterized by very high temperatures and the presence of ionized gases, extending from about 85 km to 600 km.
5. Exosphere - the outermost layer, where the atmosphere thins out and merges with outer space, starting around 600 km.
| 5. What role does oxygen play in the atmosphere ? | |
Ans. Oxygen is essential for the survival of most living organisms on Earth, as it is required for cellular respiration. It is produced by plants during photosynthesis and is vital for combustion processes. Additionally, oxygen helps form ozone (O₃), which protects the Earth from harmful ultraviolet radiation.
About this Document
Oct 11, 2025
Last updated
Related Exams
Document Description: Worksheet: Air and Atmosphere for Class 7 2025 is part of Chemistry Class 7 ICSE preparation.
The notes and questions for Worksheet: Air and Atmosphere have been prepared according to the Class 7 exam syllabus. Information about Worksheet: Air and Atmosphere covers topics
like Part A: Multiple Choice Questions , Part B: Short Answer Questions , Part C: Long Answer Questions and Worksheet: Air and Atmosphere Example, for Class 7 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Worksheet: Air and Atmosphere.
Introduction of Worksheet: Air and Atmosphere in English is available as part of our Chemistry Class 7 ICSE
for Class 7 & Worksheet: Air and Atmosphere in Hindi for Chemistry Class 7 ICSE course.
Download more important topics related with notes, lectures and mock test series for Class 7
Exam by signing up for free. Class 7: Worksheet: Air and Atmosphere | Chemistry Class 7 ICSE
Description
Full syllabus notes, lecture & questions for Worksheet: Air and Atmosphere | Chemistry Class 7 ICSE - Class 7 | Plus excerises question with solution to help you revise complete syllabus for Chemistry Class 7 ICSE | Best notes, free PDF download
Information about Worksheet: Air and Atmosphere
In this doc you can find the meaning of Worksheet: Air and Atmosphere defined & explained in the simplest way possible. Besides explaining types of
Worksheet: Air and Atmosphere theory, EduRev gives you an ample number of questions to practice Worksheet: Air and Atmosphere tests, examples and also practice Class 7
tests
Related Searches
Sample Paper
,mock tests for examination
,MCQs
,shortcuts and tricks
,Worksheet: Air and Atmosphere | Chemistry Class 7 ICSE
,video lectures
,practice quizzes
,study material
,past year papers
,Exam
,Viva Questions
,Worksheet: Air and Atmosphere | Chemistry Class 7 ICSE
,ppt
,Semester Notes
,Worksheet: Air and Atmosphere | Chemistry Class 7 ICSE
,Important questions
,Extra Questions
,Previous Year Questions with Solutions
,Summary
,Objective type Questions
,Free
;
Additional Information about Worksheet: Air and Atmosphere for Class 7 Preparation
Worksheet: Air and Atmosphere Free PDF Download
The Worksheet: Air and Atmosphere is an invaluable resource that delves deep into the core of the Class 7 exam.
These study notes are curated by experts and cover all the essential topics and concepts, making your preparation more efficient and effective.
With the help of these notes, you can grasp complex subjects quickly, revise important points easily,
and reinforce your understanding of key concepts. The study notes are presented in a concise and easy-to-understand manner,
allowing you to optimize your learning process. Whether you're looking for best-recommended books, sample papers, study material,
or toppers' notes, this PDF has got you covered. Download the Worksheet: Air and Atmosphere now and kickstart your journey towards success in the Class 7 exam.
Importance of Worksheet: Air and Atmosphere
The importance of Worksheet: Air and Atmosphere cannot be overstated, especially for Class 7 aspirants.
This document holds the key to success in the Class 7 exam.
It offers a detailed understanding of the concept, providing invaluable insights into the topic.
By knowing the concepts well in advance, students can plan their preparation effectively.
Utilize this indispensable guide for a well-rounded preparation and achieve your desired results.
Worksheet: Air and Atmosphere Notes
Worksheet: Air and Atmosphere Notes offer in-depth insights into the specific topic to help you master it with ease.
This comprehensive document covers all aspects related to Worksheet: Air and Atmosphere.
It includes detailed information about the exam syllabus, recommended books, and study materials for a well-rounded preparation.
Practice papers and question papers enable you to assess your progress effectively.
Additionally, the paper analysis provides valuable tips for tackling the exam strategically.
Access to Toppers' notes gives you an edge in understanding complex concepts.
Whether you're a beginner or aiming for advanced proficiency, Worksheet: Air and Atmosphere Notes on EduRev are your ultimate resource for success.
Worksheet: Air and Atmosphere Class 7 Questions
The "Worksheet: Air and Atmosphere Class 7 Questions" guide is a valuable resource for all aspiring students preparing for the
Class 7 exam. It focuses on providing a wide range of practice questions to help students gauge
their understanding of the exam topics. These questions cover the entire syllabus, ensuring comprehensive preparation.
The guide includes previous years' question papers for students to familiarize themselves with the exam's format and difficulty level.
Additionally, it offers subject-specific question banks, allowing students to focus on weak areas and improve their performance.
Study Worksheet: Air and Atmosphere on the App
Students of Class 7 can study Worksheet: Air and Atmosphere alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Worksheet: Air and Atmosphere,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Worksheet: Air and Atmosphere is prepared as per the latest Class 7 syllabus.
|
© 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