We are surrounded by matter, the food we eat, the pen we use, and the chair we sit on, all are made up of matter. It is anything that has mass and occupies space and exists in 3 different forms: Solid, liquid, and gas. NCERT Exemplar Class 9 Science Chapter 1 Matter in Our Surroundings will teach us about matter, its numerous forms, and how it evolves in different contexts. Understanding matter is very important because it is the basis of everything we see and use in the world.
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These NCERT Exemplar Solutions Class 9 Science provides systematic explanations of Matter in Our Surroundings that form the basis of chemistry. The articles feature Exemplar questions and their step-by-step explanations that help students grasp the concept, and excel in board and competitive exams. This complete set of NCERT exemplar solutions serves as a tool to improve the problem-solving abilities of students and consequently improve their academic performance. Students can also check NCERT Solutions to all questions chapter-wise.
At first, the MCQ questions are covered in the Class 9 Science Chapter 1 NCERT Exemplar Matter in Our Surroundings to enhance your knowledge. The concepts are explained in detail in Class 9 Science Chapter 1 Matter in Our Surroundings notes available on our website.
Question 1. Which one of the following sets of phenomena would increase on raising the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases
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Answer: c
Temperature is the measurement of kinetic energy of particles or molecules for any substance, so on increasing temperature their kinetic energy increases.Question 2. Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions:
(a) Low temperature, low pressure
(b) High temperature, low pressure
(c) Low temperature, high pressure
(d) High temperature, high pressure
Answer: C
Ideally a gas does not have interaction between molecules by any kind of force. In real gases these forces are present and can be decreased by decreasing pressure and increasing temperature. Therefore any natural gas will behave as an ideal gas, if its temperature is increased and pressure is decrease.Question 3. The property to flow is unique to fluids. Which one of the following statements is correct?
(a) Only gases behave like fluids
(b) Gases and solids behave like fluids
(c) Gases and liquids behave like fluids
(d) Only liquids are fluids
Answer: C
The intermolecular force among the molecules of a solid is very strong so molecules cannot change its position on increasing temperature. These molecules of solid can vibrate at their own place but cannot leave their place hence they have rigidity.Question 4. During summer, water kept in an earthen pot becomes cool because of the phenomenon of
(a) diffusion
(b) transpiration
(c) osmosis
(d) evaporation
Answer: D
The old Indian method to cool down the water is, Storing water in earthen pots.Question 5. A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement?
(a) Water, air, wind
(b) Air, sugar, oil
(c) Oxygen, water, sugar
(d) Salt, juice, air
Answer: C
The intermolecular forces and its strength defines the state of matter.Question 6.
On converting 25°C, 38°C and 66°C to kelvin scale, the correct sequence of temperature will be
(a) 298 K, 311 K and 339 K
(b) 298 K, 300 K and 338 K
(c) 273 K, 278 K and 543 K
(d) 298 K, 310 K and 338 K
Answer: A
Celsius scale of temperature is based on water and its state. The melting point is taken as zero reference and boiling point of water is taken as 100.Question 7. Choose the correct statement of the following
(a) conversion of solid into vapours without passing through the liquid state is called sublimation.
(b) conversion of vapours into solid without passing through the liquid state is called vapourisation.
(c) conversion of vapours into solid without passing through the liquid state is called freezing.
(d) conversion of solid into liquid is called sublimation.
Answer: A
When the temperature of the gas decreases, at a particular temperature the gas get liquefy, this phenomenon is called condensation. If we further decrease the temperature of liquid, the liquid get converted into solid, this phenomenon is called freezing.Question 8. The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in kelvin scale?
(a) 306 K, 329 K, 391 K
(b) 308 K, 329 K, 392 K
(c) 308 K, 329 K, 391 K
(d) 329 K, 392 K, 308 K
Answer: C
Celsius scale of temperature is based on water and its state. The melting point is taken as zero reference and boiling point of water is taken as 100.Question 9. Which condition out of the following will increase the evaporation of water?
(a) Increase in temperature of water
(b) Decrease in temperature of water
(c) Less exposed surface area of water
(d) Adding common salt to water
Answer: A
In case of evaporation, some liquid molecules take energy from rest of the liquid molecules and get converted in vapour.Question 10. In which of the following conditions, the distance between the molecules of hydrogen gas would increase?
(i) Increasing pressure on hydrogen contained in a closed container
(ii) Some hydrogen gas leaking out of the container
(iii) Increasing the volume of the container of hydrogen gas
(iv) Adding more hydrogen gas to the container without increasing the volume of the container
(a) (i) and (iii)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Answer: C
Molecules of gas acquire the complete volume of container.Here some short answer type questions from NCERT Exemplar Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings are given for practice. This section contains important questions that are asked in the exams.Practice short answer types from the questions below.
Answer:
At one atmospheric pressure condition, pure water start boiling at 100°C and it freezes at 0°C.Answer:
Ice and water can coexist at 0°C which is melting point of ice. As stated in the question, initially the container has ice as well as water, therefore the initial temperature has to be 0°C.Answer:
a) CoolingQuestion 14. Match the physical quantities given in column A to their S I units given in column B
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(A)
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(B)
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(a) Pressure
(b) Temperature
(c) Density
(d) Mass
(e) Volume
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(i) cubic meter
(ii) kilogram
(iii) pascal
(iv) kelvin
(v) kilogram per cubic meter
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Answer:
(a—iii) (b—iv) (c—v) (d—ii) (e—i)
| A | B |
| (a) degree celsius | (i) kilogram |
| (b) centimetre | (ii) pascal |
| (c) gram per centimetre cube | (iii) metre |
| (d) bar | (iv) kelvin |
| (e) milligram | (v) kilogram per metre cube |
Answer:
(a—iv) (b—iii) (c—v) (d—ii) (e—i)Question 16. ‘Osmosis is a special kind of diffusion’. Comment.
Answer:
In diffusion of liquid or gases, the particles move from higher concentration to low concentration.Question 17. Classify the following into osmosis/diffusion
(a) Swelling up of a raisin on keeping in water.
(b) Spreading of virus on sneezing.
(c) Earthworm dying on coming in contact with common salt.
(d) Shrinking of grapes kept in thick sugar syrup.
(e) Preserving pickles in salt.
(f) Spreading of smell of cake being baked through out the house.
(g) Aquatic animals using oxygen dissolved in water during respiration.
Answer:
(a)(c)(d)(e) – Osmosis (b)(f)(g) - DiffusionQuestion 18. Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.
Answer:
When heat is released from our body, this effect cools down the body.Answer:
In the process of boiling, water converts into steam by absorbing heat but without changing temperature. This heat is called latent heat of evaporation and it is possessed by vapour molecules.Answer:
When hot water tumbler is kept in freezer, the temperature of water decreases as it loses energy to the freezer. The decrease in temperature of water goes up to 0°C. The water still loses energy to refrigerator as its temperature is less than 0°C, but this loss of energy will change the phase of water and it get converted in ice.Answer:
The process of evaporation will be more if surface area of water is more.Question 22. (a) Conversion of solid to vapour is called sublimation. Name the term used to denote the conversion of vapour to solid.
(b) Conversion of solid state to liquid state is called fusion; what is meant by latent heat of fusion?
Answer:
A) The opposite of sublimation is generally known as de-sublimation. It is also known as deposition. In this Phenomenon, vapour get converted into solid directly without having liquid state.Get your results instantly with our calculator!
The following are the long-answer type questions that needs more practice. These NCERT Exemplar Class 9 Science Chapter 1 Matter in Our Surroundings important questions are frequently asked in the exams. Long-answer type questions are covered to improve your subject knowledge and conceptual thinking:
Answer:
Only polar compounds dissolve in water.Answer:
In season of summers the body tries to cool down itself by sweating. In this process, body excrete water from the skin and this water get evaporated and cools down the body.Answer:
The wet clothes loses water by the process of evaporation.Question 26. Comment on the following statements:
(a) Evaporation produces cooling.
(b) Rate of evaporation of an aqueous solution decreases with increase in humidity.
(c) Sponge though compressible is a solid.
Answer:
a) In the process of evaporation, some molecules of liquid takes energy from other liquid molecules. By absorbing this energy, these molecules got converted in vapour.Question 27. Why does the temperature of a substance remain constant during its melting point or boiling point?
Answer:
The energy possessed by gases is more than liquids and similarly liquid possess more energy than solids.Some Matter in Our Surroundings Class 9 Science Chapter 1 questions and answers are given below that will help you tackle complex problems. The questions below will help you evaluate your understanding of the concepts.
Question 1: Which one of the following sets of phenomena would increase on raising the temperature?
(1) Diffusion, evaporation, compression of gases
(2) Evaporation, compression of gases, solubility
(3) Evaporation, diffusion, expansion of gases
(4) Evaporation, solubility, diffusion, compression of gases
Answer:
Particles of matter are continuously moving as they possess kinetic energy. Matter has particles that intermix at increasing temperatures. This phenomenon is called diffusion.
Evaporation means the conversion of a liquid state into a vapour state. On increasing temperature, molecules move so quickly that they evaporate into the atmosphere.
An increase in temperature results in the rise of molecules in the atmosphere, which further results in the expansion of gas.
Hence, the correct answer is option (3)
Question 2: Select the correct statement:
(1) a small raindrop (water drop) contains about $10^{21}$ particles of water in it.
(2) The particles which make up matter are so small that we cannot see them even with a high power microscope.
(3) The evidence also shows that the particles which make up the matter are constantly ‘moving’ (they are in motion).
(4) all the above
Answer:
According to the definition of matter as given in the concept, all the given options are correct.
Hence, the answer is the option (4).
Question 3: Which of the following will respond to sublimation?
(1) Common salt
(2) Sugar
(3) Camphor
(4) Potassium nitrate
Answer:
Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. So, all solids that possess an appreciable vapor pressure at a certain temperature usually can sublime in air (e.g. water ice just below 0 °C). Thus, out of the given options, camphor is the substance that undergoes sublimation.
Hence, the answer is the option (3).
Question 4: According to ancient philosphers matter consists of
(1) three constituents
(2) four constituents
(3) five constituents
(4) six constituents
Answer:
Matter can be classified in a number of ways. Ancient Indian philosophers said that all the matter (padarth), living or non-living was made up of five basic elements, air, earth, sky, fire, and water.
Hence, the answer is the option (3).
Question 5: When a glass of ice-cold water is kept open at room temperature, what observation is found?
(1) water starts to evaporate
(2) water droplets are observed on the outer walls of the glass
(3) temperature of water remains same
(4) volume of the ice cold wate increases
Answer:
When a glass of water is kept at room temperature, water droplets are observed on the outer walls of the glass. This is because the water vapor present in the air when coming in contact with glass containing ice-cold water loses the heat energy, and thus, the water vapor present in the air gets condensed.
Hence, the answer is the option (2).
To solve Class 9 Science Chapter 1 NCERT Exemplar Matter in Our Surroundings questions, it is important to follow a systematic approach. It is recommended to strategies your study plan to solve the questions of this chapter. The following are the points that will help you build a good approach.
1. Recall the fundamental concepts like Matter occupies space and has mass, there are 3 States of Matter
2. It is advisable to practice drawing diagrams such as the states of matter chart, change of state by heating or cooling and cooling curve of water. This will add up to the beauty of your answer.
3. Know how to define terms (e.g., sublimation, latent heat) and write clear differences (like between boiling and evaporation).
4. Attempt all questions from the book including in-text questions. Learn to write answers in simple, clear sentences based on textbook explanations. The Class 9 Science Chapter 1 Matter in Our Surroundings notes will help you revise the topics.
5. Go through NCERT Exemplar Class 9 Science Solutions Chapter 1 Matter in Our Surroundings and real-life examples (e.g., camphor sublimation, perfume diffusion) as they often form the basis for application questions.
After studying, close the book and try recalling answers or concepts. You can also take help from Matter in our surroundings class 9 notes.
NCERT exemplar Class 9 Science solutions chapter 1 deals with the specified topics:
NCERT Exemplar Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings help students to understand the basic concepts of matter and its states effectively. Given below some points on the advantages of these solutions:
Along with NCERT Exemplar Class 9 Science Chapter 1 Matter in Our Surroundings students can follow the links for other class 9 solutions
Refer to the links given below for detailed solutions of NCERT Class 9 Science. These solutions are prepared by subject experts to help you understand the chapters well and prepare effectively for exams.
Students can refer to the links given below for the NCERT subject-wise solutions:
Students can refer to the links given below for the NCERT books and syllabus :
Frequently Asked Questions (FAQs)
Matter is anything that occupies space and has mass. In other words, anything that has volume and weight is considered matter.
The three common states of matter are: Solid, Liquid, and Gas.
Solids: Have a definite shape and definite volume. Liquids: Have no definite shape but have a definite volume. They take the shape of their container. Gases: Have no definite shape and no definite volume. They fill the entire container.
Change of state refers to the conversion of a substance from one physical state (solid, liquid, or gas) to another. Examples include: Melting (Solid to Liquid): Ice melting into water. Boiling/Vaporization (Liquid to Gas): Water boiling to steam. Freezing (Liquid to Solid): Water freezing into ice. Condensation (Gas to Liquid): Steam condensing into water. Sublimation (Solid to Gas): Dry ice turning directly into carbon dioxide gas. Deposition (Gas to Solid): Water vapour directly turning into snow.
Latent heat of fusion: The heat required to change 1 kg of a solid into a liquid at its melting point. Latent heat of vaporization: The heat required to change 1 kg of a liquid into a gas at its boiling point.
As the temperature increases, the rate of evaporation also increases. Higher temperature provides more kinetic energy to the liquid particles, making it easier for them to overcome the intermolecular forces and escape into the gaseous state.
NCERT Exemplar Solutions for Class 9 Science are important because they provide advanced, high-quality questions that strengthen conceptual understanding and improve problem-solving skills.
Class 9 Science Chapter 1 NCERT Exemplar Matter in Our Surroundings solutions offer detailed answers to advanced questions based on the states of matter, their properties, and changes in state, helping students build strong conceptual clarity.
You can find the NCERT Exemplar for Class 9 Science Chapter 1 on the official NCERT website or on trusted educational platforms that provide free downloadable PDFs.
NCERT Exemplar questions are advanced, higher-order problems designed to deepen understanding and enhance analytical thinking, going beyond the basic NCERT textbook exercises.
A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is
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Option 2)
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Option 4)
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An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range
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Option 2)
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Option 4)
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A particle is projected at 600 to the horizontal with a kinetic energy . The kinetic energy at the highest point
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Option 2)
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Option 4)
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In the reaction,
| Option 1)
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Option 2)
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Option 4)
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How many moles of magnesium phosphate, will contain 0.25 mole of oxygen atoms?
| Option 1)
0.02 |
Option 2)
3.125 × 10-2 |
| Option 3)
1.25 × 10-2 |
Option 4)
2.5 × 10-2 |
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