NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings PDF

NCERT Solutions is very important for all the students who want to ace their examinations. These solutions are developed by highly qualified subject matter experts at Selfstudys who have devoted their time and energy to help the students understand the topic with a clearly understanding. They have made sure to include each and every topic in these solutions and that too with explanations. Apart from this, these NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings are created as per the latest curriculum of CBSE (Central Board of Secondary Education) which also ensures that the students will be updated about the latest syllabus. This will increase their chances of scoring good marks in the exams. 

Our subject matter experts have covered each and every topic in these NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings. These solutions break the hard topics into easy terms which makes it easier for all the students to understand and learn the concept in an effective manner. Studying these solutions will give the students an idea about all the types of questions, from easy to intermediate to advanced. Also, the students will get to know about the most common types of questions that have a higher chance of appearing in the exam. 

This NCERT Solutions for class 9 Science Chapter 1 Matter in Our Surroundings is written in simple language as our subject matter experts are aware of the learning power of each and every student, this is why they have created these solutions in a simple language so that no student faces any difficulty in studying from them. These NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings can be easily downloaded from the website of Selfstudys. 

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings PDF 

The NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings can be easily downloaded from the website of Selfstudys. As they are developed by the subject matter experts in PDF Format, it becomes easier for the students to access them. Students can also access them on their mobile phones and can share them. 

1.1 Physical Nature of Matter

Q 1. Which of the following are matter?

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

• Chair: Yes, a chair is matter. It has mass and takes up space.
• Air: Yes, air is matter. Even though it's invisible, it has mass and it occupies space.
• Love: No, love is not matter. It is an emotion or feeling and does not have mass or take up space.
• Smell: No, smell is not matter. It is a sensation and does not have mass or occupy space. However, the particles that cause the smell are matter.
• Hate: No, hate is not matter. It is an emotion or feeling and does not have mass or take up space.
• Almonds: Yes, almonds are matter. They have mass and occupy space.
• Thought: No, thought is not matter. It is a mental process and does not have mass or take up space.
• Cold: No, cold is not matter. It is a sensation or a description of temperature and does not have mass or take up space.
• Lemon water: Yes, lemon water is matter. It has mass and takes up space.
• The smell of perfume: No, the smell of perfume itself is not matter. It is a sensation and does not have mass or occupy space. However, the perfume particles that cause the smell are matter.

Q 2. Give reasons for the following observation:

The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food, you have to go close.

When food is hot or sizzling, it has more heat energy. The molecules in the food will move faster as they have more kinetic energy. As they move faster, they are more likely to escape into the air, which is how the smell of food can spread.

In contrast, cold food has less heat energy, so its molecules move more slowly. This slower movement means that fewer particles escape into the air, so the smell does not spread as far.

Q 3.  A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

The property of matter that this observation shows is the "particle nature" of matter.

Water, like all forms of matter, is made up of tiny particles. These particles are in constant motion and have spaces between them. When the diver cuts through the water, his or her body displaces the water particles, which then move around the body and fill in the space behind the diver. This demonstrates that matter (in this case, water) is particulate in nature.

Q 4.  What are the characteristics of the particles of matter?

The characteristics of particles of matter are as follows:

(a) Presence of intermolecular spaces between particles

(b) Particles are in constant motion

(c) They attract each other

(d) All matter is composed of very small particles which can exist independently.

1.2 Characteristics of Particles of Matter

Q 1. The mass per unit volume of a substance is called density. (density=mass/volume). Arrange the following in the order of increasing density – air, exhaust from the chimneys, honey, water, chalk, cotton and iron.

The following substances are arranged in increasing density:

• Air
• Exhaust from chimney
• Cotton
• Water
• Honey
• Chalk
• Iron

Q 2. Answer the following.

a) Tabulate the differences in the characteristics of matter.

b) Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density.

(a) The difference in the characteristics of the three states of matter.

Characteristics	Solid	Liquid	Gas
Shape	Fixed shape	No Fixed shape	No Fixed shape
Volume	Fixed volume	Fixed volume	No Fixed volume
Intermolecular force	Maximum	Less than solids	Very less
Intermolecular space	Very less	More than solids	maximum
Rigidity/Fluidity	Rigid/cannot flow	Can flow/not rigid	Can flow/not rigid
Compressibility	negligible	compressible	Highly compressible

(b) (i) Rigidity: It is the property of matter to continue to remain in its shape when treated

with an external force.

(ii) Compressibility: It is the attribute of the particles to contract their intermolecular space when

exposed to an external force, thereby escalating its density.

(iii) Fluidity: It is the ability of a substance to flow or move about freely.

(iv) Filling the gas container: The particles in a container take their shape as they randomly vibrate in all possible directions.

(v) Shape: It is the definite structure of an object within an external boundary

(vi) Kinetic energy: Motion allows particles to possess energy which is referred to as kinetic energy. The increasing order of kinetic energy possessed by various states of matter are:

Solids < Liquids < Gases

Mathematically, it can be expressed as K.E = 1/2 mv², where ‘m’ is the mass and ‘v’ is the velocity of the particle.

(vii) Density: It is the mass of a unit volume of a substance. It is expressed as:

d = M/V, where ‘d’ is the density, ‘M’ is the mass and ‘V’ is the volume of the substance

Q 3. Give reasons

a) A gas fills completely the vessel in which it is kept.

b) A gas exerts pressure on the walls of the container.

c) A wooden table should be called a solid.

d) We can easily move our hand in the air, but to do the same through a solid block of wood, we need a karate expert.

(a) There is a low force of attraction between gas particles. The particles in the filled vessel are free to move about.

(b) Gaseous particles have the weakest attraction force. They are always moving in a haphazard manner. When a gas particle collides with the container’s walls, it exerts force and, thus pressure on the wall.

(c) There is a distinct contour and volume to the hardwood table. The wood particles are tightly packed. They do not conform to the container’s shape. As a result, the solid features of a hardwood table are satisfied.

(d) The boundaries between air particles are quite loose. They are a long way apart and have a lot of space between them. As a result, we may move our hands freely in the air. The particles in a solid block, on the other hand, are bound together by a strong force of attraction. As a result, there is either some or no space between them. As a result, we will require a karate expert.

Q 4. Liquids generally have a lower density than solids. But you must have observed that ice floats on water. Find out why.

In general, the volume of a liquid is more than the volume of a solid because liquid particles are freer to move, resulting in more volume. Ice, on the other hand, has a maximum density of water at 4 degrees Celsius. Ice is lighter than water and has a lower density. As a result, it floats on water.

1.5 Evaporation

Q 1. Why does a desert cooler cool better on a hot dry day?

Solution: It is because the temperature is high and less humid on a hot dry day, enabling better evaporation. High levels of this evaporation provide better cooling effects.

Q 2. How does the water keep in an earthen pot (matka) become cool during summer?

Solution: An earthen pot is porous in nature. These tiny pores facilitate the penetration of water and hence their evaporation from the pot surface. The process of evaporation requires energy which is contributed by water in the pot as a result of which water turns cooler.

Q 3. Why does our palm feel cold when we put on some acetone or petrol, or perfume on it?

Solution: Acetone, petrol, and perfume are volatile substances that evaporate when they come in contact with air. Evaporation is facilitated as it uses energy from the palm, hence leaving a cooling effect on our palms.

Q 4. Why are we able to sip hot tea or milk faster from a saucer rather than a cup?

Solution: A saucer has a larger surface area than a cup, promoting quicker evaporation. Hence, the tea or milk in a saucer cools down faster.

Q 5. What type of clothes should we wear in summer?

Solution: In summer, it is preferred to wear light-coloured cotton clothes because light colour reflects heat and cotton materials have pores that absorb sweat, facilitating evaporation, and hence causing a cooling effect on the skin.

NCERT Solutions for Class 9 Science Exercise Wise 

The subject matter experts at Selfstudys have created the NCERT Solutions for Class 9 in a chapter-wise format which helps the students to study the concepts in an organized way. This prevents them from getting confused and gives them a clear understanding of all the topics. 

1. Convert the following temperatures to the Celsius scale.

(a) 293 K 

(b) 470 K 

Answer 1: 

(a) 300 K = 300 – 273 = 27 ⁰C 

(b) 573 K = 573 – 273 = 300 ⁰C 

2. Convert the following temperatures to the kelvin scale. 

(a) 25o °C 

(b) 373o °C 

Answer 2: 

(a) 25^OC = 25 + 273 = 298 K 

(b) 373^OC = 373 + 273 = 646 K 

3. Give a reason for the following observations. 

(a) Naphthalene balls disappear with time without leaving any solid. 

(b) We can get the smell of perfume sitting several metres away. 

Answer 3:

(a) Naphthalene shows the property of sublimation. Evaporation of naphthalene takes place easily and so it disappears during course of time without leaving a solid. 

(b) Perfumes vaporize very fast and its vapours diffuse into air easily. That is why we can smell perfume sitting several meters away.

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

Answer 4:

Oxygen < Water < Sugar.

5. What is the physical state of water at— 

(a) 25 °C 

(b) 0 °C 

(c) 100 °C? 

Answer 5: 

(a) Liquid 

(b) Solid and Liquid

(c) Liquid and Vapours

6. Give two reasons to justify— 

(a) water at room temperature is a liquid.

(b) an iron almirah is a solid at room temperature. 

Answer 6: 

(a) Water at room temperature is a liquid because it has fluidity and has definite volume but no definite shape. 

(b) An iron almirah is a solid at room temperature because it is rigid and has a definite shape. 

7. Why is ice at 273 K more effective in cooling than water at the same temperature? 

Answer 7: 

Ice at 273 K is less energetic than water. It is because of the difference in the latent heat of fusion which is present in water at the same temperature in the form of extra energy. 

8. What produces more severe burns, boiling water or steam? 

Answer 8:

Steam produces more severe burns than boiling water. This is because steam has more energy than boiling water, present in it in the form of latent heat of vaporization. 

9. Name A,B,C,D,E and F in the following diagram showing change in its state:

Answer 9:

A → Melting 

B → Boiling 

C → Condensation 

D → Solidification

E → Sublimation 

F → Sublimation

What you have learnt from NCERT Solutions for Class 9 Science Chapter 1? 

NCERT Solutions for Class 9 Science Chapter 1 consists of accurate topics. These topics act as a quick reference guide for students, helping them understand and apply scientific concepts effectively in exams and problem-solving situations. 

• The matter is made up of small particles.
• The matter around us exists in three states—solid, liquid and gas.
• The forces of attraction between the particles are maximum in solids, intermediate in liquids and minimum in gases.
• The spaces in between the constituent particles and the kinetic energy of the particles are minimum in the case of solids, intermediate in liquids and maximum in gases.
• The arrangement of particles is most ordered in the case of solids, in the case of liquids layers of particles can slip and slide over each other while for gases, there is no order, particles just move about randomly.
• The states of matter are inter-convertible. The state of matter can be changed by changing temperature or pressure.
• Sublimation is the change of a solid state directly to the gaseous state without going through the liquid state.
• Deposition is the change of a gaseous state directly to a solid state without going through the liquid state.
• Boiling is a bulk phenomenon. Particles from the bulk (whole) of the liquid change into a vapour state.
• Evaporation is a surface phenomenon. Particles from the surface gain enough energy to overcome the forces of attraction present in the liquid and change into the vapour state.
• The rate of evaporation depends upon the surface area exposed to the atmosphere, the temperature, the humidity and the wind speed.
• Evaporation causes cooling.
• Latent heat of vaporisation is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its boiling point.
• Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point.
• Some measurable quantities and their units to remember:

Quantity	Unit	Symbol
Temperature	kelvin	K
Length	metre	m
Mass	kilogram	kg
Weight	newton	N
Volume	cubic metre	m3
Density	kilogram per cubic metre	kg m–3
Pressure	pascal	Pa

• How to Download the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings? 

Downloading the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is if you know the right steps. The steps to download them are as follows: 

• Visit the official website of Selfstudys i.e. Selfstudys.com.

• Once the website is completely loaded, you need to click on the three lines which you will find on the upper left side. Following that, you have to click on the ‘NCERT Books and Solutions’ column. 

 

• After clicking on the option of ‘NCERT Books and Solutions’, a new list will open where you need to select the option of ‘NCERT Solutions’. 

 

• Following that, you will be redirected to a page where you need to select the class and the subject for which you want to download the NCERT Solutions. 

• In this case, you need to select class 9 and the subject Science to download the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings. 

What are the Features of the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings? 

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• Easy Access: Another great feature of the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is that it can be accessed easily on the website of Selfstudys. They are also 24*7 available which is beneficial for students who want to study at night. 

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• Easy Language used: The language which is used in the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is easy because our subject matter experts at Selfstudys have developed these solutions in the easiest language as they are aware of the learning potential of each and every student. 

• Well-Structured Format: The NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is developed in a well-developed format which helps the students to study with a clear understanding of all the topics without getting confused. 

• Accuracy and Dependable: Our subject matter experts have created these NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings after investing a good amount of time in them. They are accurate and dependable for exam preparation. These notes can also be extremely helpful for the students who do self-study. 

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The NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings has several benefits to offer to the students. Some of the most important of them are: 

• In-Depth Knowledge of the Topic: One of the biggest benefits of NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is that it provides an in-depth knowledge of the topics. Each and every concept is well-detailed in these NCERT solutions. The diagrams and examples are also given to help the students understand the topics in a better way and also help in keeping the students interested. 

• Boosts Various Skills: Regularly practicing the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings helps the students to boost various skills of the students which consist of various skills like problem-solving skills and analytical skills. 

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• The Solutions are 100% authentic: One of the biggest benefits of the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is that they are 100% authentic. The subject matter experts at Selftsudys have invested a good amount of time in developing them and have ensured that they are 100% authentic. This helps the students to learn all the concepts in a clear manner. 

What are the tips to study from the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings? 

There are various tips that can help the students to study effectively from the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings: 

• Do a thorough reading of the NCERT Solutions: All the students are advised to do a thorough reading of the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings as it will help them to understand the basic concepts with clearly understanding. 

• Create a timetable and follow it: It is very important for all the students to not only create a timetable but also follow it on a regular basis as it will help the students to know about the importance of discipline and getting disciplined. The students are advised to give at least 30-40 minutes to learn the concepts thoroughly. They should give enough time to each topic that is present in the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings. Regularly following this schedule ensures the timely completion of the topics. 

• Reduce the distractions: It is advisable for all the students to reduce all teh distractions as they can affect their exam preparation of the student. They should stay away from their mobile phones and other electronic gadgets, for example, TV, etc. to avoid all the distractions while studying NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings. 

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There are various ways to master NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings. Some of the most important of them are: 

• Go through the NCERT Solutions thoroughly: The first thing which students should do to master the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is to read them thoroughly as it will help them to strengthen the basics. This will make it easier for them to learn the concepts faster and with accuracy. 

• Practice these NCERT Solutions on a regular basis: All the students are advised to regularly practice the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings as it will help them to grasp the concepts easily which will eventually enable them to score good marks in their exams. Apart from this, the conceptual knowledge of all the students is also increased. 

• Make a list of your mistakes and work on them: All the students are advised to make a list of their mistakes while studying the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings and work on them as it will help them to understand where they are lacking behind and what they can do to improve themselves in order to do well in their exams. 

• Practice additional exercises: Apart from the exercises provided in the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings, the students should practice additional problems related to the concepts covered in Chapter 1 Matter in Our Surroundings. This will further reinforce your understanding and help you apply the learned concepts in different contexts. 

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To maximize your learning potential while solving the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings, here are the tips which can help you: 

• Read the NCERT Solutions thoroughly: It is advisable for all the students to read the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings thoroughly as it will help them to understand the topics clearly understanding which will make it easier for them to learn all the concepts. 

• Practice on a regular basis: This is one of the most important features which every student should follow in order to do exam preparation effectively. This means practicing the NCERT Solutions on a regular basis as it will help them in understanding the concepts with clear understanding and in-depth knowledge which can help them to score good marks in the exams. 

• Revise the concepts on a regular basis: Revising all the concepts from NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is very important for students as it helps them recall all the information they studied during exam preparation. To ensure regular revision, students can use various methods such as creating flashcards, notes, and other study materials. 

What Are the Methods To Study From NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings? 

Studying for the exam requires focus and concentration. Below we will discuss various methods of how students can study for an Exam with the help of NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings: 

• Making a strong grip on basics: Developing a strong foundation in the fundamentals is crucial for all students, and studying NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings is an important step towards achieving this goal. By mastering the basic concepts, students can gain a clear understanding of the subject, which in turn facilitates quicker and more effective learning. 

• Study the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings on a regular basis: All the students are advised to study NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings regularly as it will help them to prepare for the exam effectively. It also increases the chance of the students scoring good marks in the exams. 

• Always read the summary of your textbook: All the students are advised to read the summary which is included in the NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings. The students should read them regularly as they will get benefited because they will get in-depth knowledge of all the topics and will also help them to prepare well for the exams. This will increase their chances of scoring good marks in the exams. 

• Find your strengths and weaknesses: It is very essential for all the students to identify their strengths and weaknesses as it will help them to understand where they need to do more hard work in order to score good marks in their examinations. 

• Do revision on a timely basis: If students want to score good marks in their exams, it is very important for them to engage in the timely revision of NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings.