Matter in Our Surroundings Class 9 Important Questions Free PDF Download

Understanding the world around us starts with understanding the very building blocks of everything – matter. Chapter 1 of Class 9 Science, "Matter in Our Surroundings," lays the foundation for exploring the physical and chemical properties of substances. This chapter is a key part of the CBSE syllabus, helping students dive into concepts like the states of matter, changes in states, and the effects of temperature and pressure.

To ace this chapter, it’s crucial to focus on the important questions that cover both theory and practical applications. Whether it’s understanding why ice melts faster on heating or how evaporation cools our surroundings, these questions not only enhance learning but also sharpen problem-solving skills.

In this blog, we’ve compiled a list of Matter In Our Surroundings Important Questions to help you strengthen your grasp of the topic and prepare effectively for exams. Let’s get started and make learning about matter fun and engaging!

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Chapter 1 Matter in our Surroundings Important Questions

Tina found three more syringes of the same size closed with rubber cork.

She took the piston out of each syringe and filled them with coconut oil, sawdust and cotton.

Tina closed the end of each syringe with the piston. 

She then tried to press the piston of each syringe as much as possible.

Arrange the syringes in increasing order of difficulty of pressing the piston. 

Key: less dificult → more dificult

A. Syringe 1 → Syringe 2 → Syringe 3 

B. Syringe 3 → Syringe 2 → Syringe 1 

C. Syringe 1 → Syringe 3 → Syringe 2 

D. Syringe 2 → Syringe 3 → Syringe 1

Madhu poured 100 mL of water into each of the four different glass vessels.

She kept all four vessels under the Sun

Madhu noted the time taken for the water in each vessel to evaporate completely

1. Which of these questions can be answered based on the results of Madhu’s activity?

A. Does the rate of evaporation of a liquid depend on its open surface area? 

B. Does the rate of evaporation of a liquid depend on its surrounding temperature? 

C. Does the rate of evaporation of a liquid depend on the material of its container? 

D. Does the rate of evaporation of a liquid depend on the amount of moisture in the air?

Answer: A. Does the rate of evaporation of a liquid depend on its open surface area? 

Explanations: 

Based on Madhu's experiment, we can analyze the factors affecting the rate of evaporation:

The experiment varies the shape and size of the vessels, which alters the open surface area of the liquid.

Since the time taken for evaporation differs for each vessel, the experiment shows that the rate of evaporation depends on the open surface area of the liquid.

However, the experiment does not provide any data or control for:

Surrounding temperature (B)

Material of the container (C)

Moisture in the air (D)

2. Why did Madhu pour an equal amount of water into each vessel? Explain your answer.

Answer:

Madhu poured an equal amount of water into each vessel to ensure that the volume of water was not a variable affecting the rate of evaporation. By keeping the amount of water constant, she could isolate the effect of surface area (the variable she was testing) on the rate of evaporation.

If the volume of water were different in each vessel, the rate of evaporation might also differ due to the amount of water present, making it impossible to attribute the differences in evaporation time solely to the surface area.

This approach maintains a controlled experiment, where only the surface area of the water (determined by the shape of the vessel) changes, ensuring accurate and reliable results.

3. Cotton clothes are comfortable to wear in summer. Which feature of cotton explains why cotton is comfortable to wear in summer? 

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Answer:

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Explanations:

Cotton is comfortable to wear in summer primarily because it absorbs water and has pores. This property allows cotton to absorb sweat from the body and facilitate evaporation, which provides a cooling effect. The fabric's porous nature also promotes air circulation, making it breathable and ideal for hot weather.

Cotton has strong fibres: No
Strong fibres do not contribute directly to comfort in summer.

Cotton is a natural fabric: Yes
Being natural, it is gentle on the skin and less likely to irritate, adding to comfort.

Cotton absorbs water and has pores: Yes
This is the key reason for its comfort in summer, as it keeps the body cool by absorbing sweat and facilitating evaporation.

Chapter 1 Matter in our Surroundings Important Concepts

Everything around us is made up of matter. Matter is anything that has mass and occupies space. It can exist in three main states: solid, liquid, and gas. These states depend on factors like temperature and pressure.

Important Points:

Characteristics of Matter:

Matter is made of tiny particles that are too small to see.

These particles have space between them, move constantly, and attract each other.

States of Matter:

Solids: Have a fixed shape and volume. Particles are tightly packed and can only vibrate in place.

Liquids: Have a fixed volume but no fixed shape. Particles are loosely packed and can slide past each other.

Gases: Neither fixed shape nor volume. Particles are very far apart and move freely at high speeds.

Changing States of Matter: Matter can change from one state to another when we change the temperature or pressure. For example:

Melting: Solid to liquid.

Freezing: Liquid to solid.

Evaporation: Liquid to gas.

Condensation: Gas to liquid.

Sublimation: Solid to gas without becoming a liquid (e.g., camphor).

Latent Heat:

Heat is required for a substance to change its state. This heat is called latent heat, and it doesn’t change the temperature but helps break bonds between particles.

Effect of Pressure:

Increasing pressure can turn gases into liquids or even solids. For example, high pressure and low temperature convert CO₂ gas into dry ice.

Evaporation:

The process by which a liquid turns into a gas at any temperature below its boiling point.

Factors affecting evaporation: Surface area, temperature, humidity, and wind speed.

Evaporation causes cooling because particles absorb energy from their surroundings to escape.

This chapter helps us understand the physical nature of matter and how it behaves under different conditions. By learning this, we can explain everyday phenomena like melting ice, boiling water, or the cooling effect of sweat.

Chapter 1 Matter in Our Surroundings Important Questions: Why

Chapter 1, "Matter in Our Surroundings," forms the foundation of many key concepts in science. Understanding this chapter thoroughly is essential because:

Foundation for Future Topics: The concepts of matter, states of matter, and changes in states play a vital role in higher classes and competitive exams like NEET and JEE.

Exam-Oriented Preparation: Focusing on important questions helps students prepare efficiently for school exams and score better marks. These questions are designed to cover critical topics and frequently asked questions in exams.

Conceptual Clarity: Practicing important questions ensures a deeper understanding of concepts like latent heat, evaporation, and sublimation, which are crucial for both theoretical and practical applications.

Application of Knowledge: These questions often require students to think beyond rote learning, applying their knowledge to real-life phenomena, such as why we feel cool after sweating or how pressure affects the state of matter.

Time Management: Focusing on key questions helps students identify and prioritize topics, making their study sessions more productive and time-efficient.

By practising the most relevant and high-weightage questions, students can gain confidence and excel in both exams and their overall understanding of science.

Chapter 1 Matter in Our Surroundings Important Questions: How

Preparing for Chapter 1, "Matter in Our Surroundings," requires a strategic approach to grasp the concepts effectively and tackle exam-oriented questions. Here's a step-by-step guide on how to approach and practice the important questions:

Understand the Important Topics

Before diving into the questions, ensure you have a clear understanding of the core concepts in the chapter:

• Characteristics and nature of particles in matter.
• States of matter: Solids, liquids, and gases.
• Interconversion of states (melting, freezing, boiling, condensation, sublimation).
• Latent heat and its role in state changes.
• Factors affecting evaporation and its practical applications.

Categorize the Questions

Organize important questions into different categories:

• Definition-based: For example, "What is the matter? What are its characteristics?"
• Conceptual: "Why does a gas have no fixed shape or volume?"
• Application-based: "Explain why evaporation causes cooling with examples."
• Numerical Problems: "Calculate the amount of heat required to convert ice at 0°C to water at 0°C."

Practice Diagrams and Graphs

Some questions require diagrams or graphical representation. Practice these for:

• States of matter.
• Heating curves of water.
• Changes in states of matter with temperature and pressure.

Solve Previous Years’ Questions

Look at past CBSE exam papers and focus on repeated questions or topics. These often give you an idea of the chapter's exam weightage and trends.

Revise Real-Life Applications

Understand and memorize practical examples like:

• Why do clothes dry faster on windy days?
• Why camphor disappears over time without leaving a residue.
• How pressure cookers make cooking faster.

Test Yourself

Take timed quizzes or mock tests with the important questions to evaluate your preparation level. Focus on weak areas and clarify doubts to ensure thorough understanding.

By following these steps, you'll not only excel in Chapter 1 but also develop a strong foundation for advanced topics in science! We hope that you practice the above Class 9 Science Chapter 1 Extra Questions And Answers and achieve your dream marks.

All the best!