CBSE Important Questions for Class 9 Science Chapter 1 Matter in Our Surroundings

CBSE Important Questions for Class 9 Science Chapter 1 Matter in Our Surroundings: The chapter Matter in Our Surroundings is one of the first and most important topics in Class 9 Science. It helps you understand what matter is, how it exists around us, and how it changes from one state to another, like solid to liquid or gas. These basic ideas are not just useful for your exams but also for understanding science better in higher classes. That’s why learning this chapter well is really important.

To prepare effectively, you should always start with your NCERT textbook. Most questions in the CBSE exam come directly from NCERT, so reading it properly is a must. After that, you can practise the matter in our surroundings class 9 important questions with answers. These questions help you know what kind of questions are usually asked in exams. Solving matters in our surroundings, extra questions also give you a good idea of how well you have understood the chapter. Check below article below for CBSE Important Questions for Class 9 Science Matter in Our Surroundings.

Check Out: Class 9th Books

CBSE Important Questions for Class 9 Science Matter in Our Surroundings

To do well in this chapter, it is important to focus on concept clarity and regular practice. While the NCERT textbook is your first guide, solving the right questions is just as important. That’s why practising CBSE Important Questions for Class 9 Science Matter in Our Surroundings can really help in scoring better. 

Platforms like PW (Physics Wallah) provide well-structured and exam-relevant matters in our surroundings with class 9 important questions with answers that match the CBSE pattern.

Here we have provided CBSE Important Questions Class 9 Science Chapter 1 Matter in Our Surroundings- 

Q.1. Which of the following matter?

Chair, air, love, smell, hate, almonds, thought, cold, cold drink, the smell of perfume.

Ans: As we can define matter as any ‘physical substance’, hence almonds,  air, chair, the smell of perfume, cold drink and smell can be considered as matter.

Q.2. Convert the following temperature to a Celsius scale: i) The temperature is 300 K.

Ans: When we use: K = 273 + ⁰C:

⁰C = K - 273

= 300 - 273

= 27⁰C

ii) The temperature is 573 K

Ans: When we use: K = 273 + ⁰C:

⁰C = 573 - 273

= 300 ⁰C

What is the physical state of water at:

(a) A temperature of 250 ⁰C

Ans: The boiling point of water is 100 ⁰C, hence the physical state of water at 250⁰C will be gaseous.

(b) A temperature of 100 ⁰C

Ans: The boiling point of water is 100 ⁰C, hence at 100 ⁰C water is in the gaseous state.

Q.3. For any substance, why does the temperature remain constant during the change of state?

Ans: The reason behind the temperature of substance or matter remaining constant during a change of state is that during the change of state all of the heat or energy provided to particles of matter is utilized to take the particles of matter apart from each other.

Suggest a method to liquefy atmospheric gases.

Ans: One method to liquefy atmospheric gases is to decrease the temperature and increase the pressure.

Q.4. Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, and oxygen.

Ans: The order of increasing forces of attraction between the particles is as  follows:

Oxygen< water< sugar.

Q.5. What is the physical state of water at-

(a) A temperature of 25 ⁰C?

Ans: The physical state of water at 25 ⁰C is liquid.

(b) A temperature of ⁰C?

Ans: The physical state of water at ⁰C is solid.

(c) A temperature of 100⁰C?

Ans: The physical state of water at 100⁰C is gas.

Q.6. If the humidity in the air increase then the rate of evaporation:

(a) decrease

(b) increase

(c) remain same

(d) both (b) and (a) depending upon the temperature

Ans: The correct option is (a) decrease.

Q.7. Which of the following statements is correct?

(a) boiling is a bulk phenomenon and evaporation is a surface phenomenon (b) boiling is a surface phenomenon and evaporation is a bulk phenomenon (c) boiling and evaporation both are a surface phenomenon

(d) boiling and surface both are bulk phenomenon

Ans: The correct option is (a) boiling is a bulk phenomenon and evaporation is a  surface phenomenon.

Q.8. If the temperature of a place is increase then evaporation:

(a) decrease

(b) increase

(c) remain same

(d) none of the above

Ans: The correct option is (b) increase.

Q.9. Which of the following has the least inter atomic spacing?

(a) solid

(b) liquid

(c) gases

(d) plasma

Ans: The correct option is (a), solid.

Q.10. If you decrease the surface area and increase the temperature, then the  rate of evaporation

(a) increase

(b) decrease

(c) remain same

(d) may increase or decrease depending upon other factors

Ans: The correct option is (c), remain the same.

Click the PDF link below to get the CBSE Important Questions for Class 9 Science Matter in Our Surroundings. 

CBSE Important Question PDF for Class 9

Summary of Class 9 Science Matter in Our Surroundings

Here is the Summary of Class 9 Science Matter in Our Surroundings:

1. Matter is anything that has mass and occupies space: everything around us is made up of matter.

2. Matter exists in three main states: solid, liquid, and gas. Each state has different properties like shape, volume, and particle arrangement.

3. The particles of matter are very small and have space between them: they are always moving and attract each other.

4. States of matter can change: matter can change from one state to another when temperature or pressure changes.

5. Processes of change in state: melting (solid to liquid), freezing (liquid to solid), evaporation (liquid to gas), condensation (gas to liquid), and sublimation (solid to gas directly).

6. Latent heat: the heat energy required to change the state of a substance without changing its temperature.

7. Evaporation depends on various factors: temperature, surface area, humidity, and wind speed.

8. Evaporation causes cooling: when a liquid evaporates, it absorbs heat from its surroundings, which cools the surface.

9. The interconversion of states shows that matter is not fixed: it can shift between solid, liquid, and gas under suitable conditions.

Check Out: Class 9th Question Banks

CBSE Class 9 Mind Map

Apart from extra questions and regular notes, students can also use mind maps to make their learning easier. PW CBSE Class 9 Mind Maps Books are here to help you understand and revise topics quickly. It has well-designed maps that show the full chapter on one page. 

For example, if you’re studying Maths, you can use the Mind Map for Class 9 CBSE Maths to revise formulas and steps. Similarly, if you’re preparing for English, check the Mind Map for Class 9 CBSE English to help you with the chapters, themes, and grammar in one go. 

Study Tips of Class 9 Science Matter in Our Surroundings

Here are tips to prepare for Class 9 Science Matter in Our Surroundings:

1. Understand, Don’t Just Memorise: Science is not about remembering. Try to understand how things work. For example, when you study the topic "Matter in Our Surroundings," focus on what matter is, how it behaves, and why it changes from solid to liquid or gas.

2. Stick to NCERT First: Your NCERT book should always be your main focus. Read each chapter carefully. Many exam questions come straight from it. Especially for topics like this one, make sure you go through every line.

3. Practice Important Questions: After understanding the chapter, go through the matter in our surroundings class 9 important questions. These help you figure out what kind of questions are asked in the exam and what areas you need to revise more.

4. Solve Extra Questions: Once you’re confident, test yourself with the matter in our surroundings class 9 extra questions. These will challenge you a bit more and show if you’ve really got the concept.

5. Use Diagrams and Examples: Always draw neat diagrams where needed and try to relate things to real-life examples. It makes answers better and easier to remember.

6. Make Short Notes: While studying, write down key points in your own words. These will be super helpful during revision.

7. Revise Regularly: Don’t wait for the exams. Keep revising whatever you study. Revisit class 9 matter in our surroundings important questions now and then to keep the concepts fresh.

8. Clear Doubts Quickly: Never ignore your doubts. Ask your teacher or search trusted sources so you don’t carry confusion to the next chapter.

Read More: NCERT Solutions for Class 9 Science Chapter 1

Matter in Our Surroundings FAQs

1. What is matter?

Matter is anything that has mass and takes up space. Everything around us, like air, water, and even our bodies, is made of matter.

2. What are the three main states of matter?

The three common states of matter are solid, liquid, and gas.

3. What are the main characteristics of the particles of matter?

Particles of matter are very tiny, have spaces between them, are always moving, and attract each other.

4. How can matter change from one state to another?

Matter can change its state when heat or pressure is applied. For example, ice (solid) turns into water (liquid) when heated.

5. What is evaporation?

Evaporation is the process by which a liquid changes into a gas at room temperature.