SEBA Class 9 Science Chapter 1 Matter in Our Surroundings MCQs (2026–27) – Assam Eduverse
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SEBA Class 9 Science Chapter 1 Matter in Our Surroundings Solutions
SEBA Class 9 Science Chapter 1 Matter in Our Surroundings MCQs – ASSEB 2026–27 Board Exam Practice
Table of Contents
Before You Start
Test your knowledge with the SEBA Class 9 Science MCQs Quiz. Read each question carefully and select the correct answer. Your answer is checked instantly after you choose an option, and a detailed explanation appears immediately to help you learn every concept and improve your exam preparation.
Which of the following is matter?
✅ Correct Answer
Concept Explanation
Air is a mixture of gases that has mass and occupies space, which means it is classified as matter. Abstract things like love, thoughts, and hate do not have mass or volume, so they are not matter.
Matter is anything that has:
✅ Correct Answer
Concept Explanation
By definition, matter is anything that possesses mass and occupies space (which means it has volume). Possessing only mass, only volume, or just a shape does not satisfy the definition of matter.
The SI unit of mass is:
✅ Correct Answer
Concept Explanation
The standard SI base unit used globally to measure mass is the kilogram (kg). Units like grams are smaller fractions of this base unit, while litres measure volume and metres measure distance.
The SI unit of volume is:
✅ Correct Answer
Concept Explanation
Since volume is derived from three dimensions of length, and the SI unit of length is the metre, the official SI unit of volume is the cubic metre ($m^3$). Litres and millilitres are common metric units but are not the standard SI unit.
Matter is made up of:
✅ Correct Answer
Concept Explanation
All states of matter are particulate, meaning they are composed of extremely tiny components collectively known as particles. These particles can be individual atoms or bonded groups called molecules. Cells are strictly the basic units of biological life.
The spreading of ink in water without stirring shows that particles of matter are:
✅ Correct Answer
Concept Explanation
When ink mixes into water on its own without being disturbed, it directly proves that the tiny particles of matter are continuously moving. They possess kinetic energy, causing them to spread out and travel through spaces between the water particles.
The intermixing of particles of two different substances on their own is called:
✅ Correct Answer
Concept Explanation
The spontaneous intermixing of particles belonging to two or more different substances due to their random motion is known as diffusion. Sublimation, boiling, and condensation are changes of state for a single substance.
Diffusion is faster in gases because:
✅ Correct Answer
Concept Explanation
Gas particles possess very high kinetic energy, which makes them travel at high speeds. Because they also have massive empty spaces between them and negligible force of attraction, they mix with other substances much faster than particles in solids or liquids do.
Particles of matter have:
✅ Correct Answer
Concept Explanation
A defining characteristic of the particles making up matter is that they exert an attractive force on one another. This internal force keeps the substance pulled together as a cohesive unit. Its relative strength changes across different physical states.
The force of attraction between particles is maximum in:
✅ Correct Answer
Concept Explanation
In solids, the constituent particles are packed very closely together because the internal force of attraction is at its maximum. This locks the particles into fixed spots and makes the material rigid, whereas liquids have weaker forces, and gases have the weakest.
Solids have:
✅ Correct Answer
Concept Explanation
Because the particles in a solid cannot move freely out of their densely packed, highly attracted arrangement, a solid object naturally maintains a distinct, fixed shape and a fixed volume.
Liquids have:
✅ Correct Answer
Concept Explanation
Particles in a liquid are close enough to hold a constant, fixed volume, but they have the freedom to flow and slide over one another. This allows a liquid to shift its layout and take the shape of whatever container it is poured into.
Gases have:
✅ Correct Answer
Concept Explanation
Gas particles possess very large intermolecular gaps and weak attractive forces. Because they move randomly in all directions, they compress or expand to match their container completely, giving them neither a fixed shape nor a fixed volume.
The process of change of solid directly into gas is called:
✅ Correct Answer
Concept Explanation
Sublimation is the transition of a substance directly from a solid state into a gaseous state without liquefying first. Evaporation and fusion follow different phase patterns, while deposition is the reverse process (gas to solid).
The process of change of gas directly into solid is called:
✅ Correct Answer
Concept Explanation
The direct conversion of a gas state into a solid structure without turning into a liquid intermediate stage during cooling is called deposition. It is the direct opposite of sublimation.
The minimum temperature at which a solid melts is called:
✅ Correct Answer
Concept Explanation
The designated minimum temperature benchmark where a solid absorbs enough energy to yield its structure and transform into a liquid at normal atmospheric pressure is defined as its melting point.
The melting point of ice is:
✅ Correct Answer
Concept Explanation
Ice melts at $0^\circ\text{C}$. Converting this value over onto the scientific absolute Kelvin scale ($K = ^\circ\text{C} + 273$) provides the corresponding measurement baseline of 273 K.
The boiling point of water is:
✅ Correct Answer
Concept Explanation
Water converts rapidly into vapor at $100^\circ\text{C}$ under typical atmospheric pressure. Adding 273 to convert this value over to the Kelvin temperature scale gives a standard reading of 373 K.
The heat required to change 1 kg of solid into liquid at its melting point is called:
✅ Correct Answer
Concept Explanation
The exact hidden thermal energy quantity required to break particle bonds and transform 1 kg of solid into a liquid state without shifting the temperature reading is defined as the latent heat of fusion. Vaporization refers strictly to liquid-to-gas transitions.
Evaporation is a:
✅ Correct Answer
Concept Explanation
Evaporation is classified as a surface phenomenon because only the energetic particles located at the surface layer break free from attractive forces to become vapor. Boiling, conversely, involves the entire bulk volume.
Assertion (A): Diffusion is faster in gases.
Reason (R): Gas particles have high speed and large spaces between them.
✅ Correct Answer
Concept Explanation
Gases show rapid rates of diffusion because their particles possess high kinetic energy, which causes them to move at high speeds. This, combined with large intermolecular spaces, allows them to mix into other substances spontaneously.
Assertion (A): Solids are rigid.
Reason (R): Particles in solids have strong force of attraction.
✅ Correct Answer
Concept Explanation
Solids keep a rigid structure and definite shape precisely because the attractive forces between their particles are maximum, clamping them close together in fixed structural layouts.
Assertion (A): Temperature remains constant during melting.
Reason (R): Heat supplied is used to overcome the force of attraction between particles.
✅ Correct Answer
Concept Explanation
During melting, the temperature reading stays constant because the supplied heat is fully used as latent heat to weaken and overcome the cohesive attractive forces keeping the solid framework intact rather than raising particle speeds.
Assertion (A): Evaporation causes cooling.
Reason (R): Particles absorb energy from the surroundings during evaporation.
✅ Correct Answer
Concept Explanation
Evaporation leaves the surroundings cooler because surface fluid particles actively draw energy and latent heat from their environment to complete their phase transformation into gas.
Assertion (A): Gases are highly compressible.
Reason (R): There is large space between gas particles.
✅ Correct Answer
Concept Explanation
Gases can be squeezed into tiny volumes because their particles are widely separated. Applying an external pressure easily pushes these scattered particles closer together over those large, empty spaces.
Assertion (A): Liquids can flow and change their shape easily.
Reason (R): Particles in liquids have a weaker force of attraction than particles in solids.
✅ Correct Answer
Concept Explanation
Liquids have fluidity and can flow because their intermolecular forces of attraction are weaker compared to those in solids. This allows liquid particles to move around and slide past each other, meaning they do not hold a rigid, fixed shape.
Assertion (A): A gas completely fills the container or vessel in which it is kept.
Reason (R): Gas particles move randomly in all directions at high speeds.
✅ Correct Answer
Concept Explanation
Gas particles have very high kinetic energy and negligible forces of attraction between them. As a result, they travel fast and randomly in all directions, spreading out until they occupy the entire volume of the container.
Assertion (A): Ice at 273 K is more effective in cooling than liquid water at the exact same temperature.
Reason (R): Ice absorbs an additional latent heat of fusion from its surroundings while melting.
✅ Correct Answer
Concept Explanation
Ice at 273 K cools surroundings better than water at 273 K because it takes away a large amount of extra heat energy (latent heat of fusion) from the environment just to break its solid bonds and melt into a liquid state.
Assertion (A): The rate of evaporation of a liquid increases when the surrounding humidity is high.
Reason (R): Humidity is defined as the amount of water vapour present in the air.
✅ Correct Answer
Concept Explanation
The Assertion is false because high humidity means the air is already saturated with water vapor, which actually decreases the rate of evaporation. The Reason is true as it correctly defines humidity.
Assertion (A): Boiling is classified as a surface phenomenon.
Reason (R): During boiling, particles from the entire bulk of the liquid absorb energy and change into vapour.
✅ Correct Answer
Concept Explanation
The Assertion is false because boiling is a bulk phenomenon, meaning particles throughout the entire volume of liquid convert to gas simultaneously. Evaporation is the one that is a surface phenomenon.
Which of the following processes are direct examples of diffusion?
- (i) Smell of perfume spreading throughout a room
- (ii) A drop of ink slowly spreading inside water
- (iii) Sugar particles dissolving and spreading in water
- (iv) The physical melting of a block of ice
✅ Correct Answer
Concept Explanation
Diffusion involves different substances intermixing spontaneously due to particle motion. Perfume vapor in air, ink in water, and sugar in water are all examples of diffusion. Melting ice is a single-substance phase change, not diffusion.
Which of the following options correctly list the typical properties of a solid?
- (i) Possesses a fixed shape
- (ii) Possesses a fixed volume
- (iii) Highly compressible under pressure
- (iv) Rigid structure
✅ Correct Answer
Concept Explanation
Solids are rigid and have fixed shapes and volumes because their constituent particles are locked tightly in place. Gases are the state of matter characterized by high compressibility.
Which of the following environmental factors cause an increase in the rate of evaporation?
- (i) An increase in the liquid's surface area
- (ii) An increase in the surrounding temperature
- (iii) An increase in the humidity of the air
- (iv) An increase in the wind speed
✅ Correct Answer
Concept Explanation
Higher temperatures, larger exposed surface areas, and strong winds all give particles more freedom or energy to escape, which increases evaporation. High humidity limits space for water vapor, slowing the process.
Which of the following statements are true when describing the gaseous state?
- (i) Constituent particles are located very far apart
- (ii) Highly compressible under external pressure
- (iii) Possesses a fixed and definite volume
- (iv) Particles can diffuse exceptionally quickly
✅ Correct Answer
Concept Explanation
Gases have large empty spaces between particles and high kinetic speeds, which accounts for their high compressibility and rapid diffusion rates. They expand or contract to fill containers, meaning they lack a fixed volume.
Which of the following phase transitions depend directly on latent heat energy?
- (i) Melting of a solid substance
- (ii) Boiling of a liquid substance
- (iii) Evaporation below the boiling point
- (iv) Spontaneous diffusion of particle streams
✅ Correct Answer
Concept Explanation
Latent heat is defined as the heat required to convert a solid to a liquid (latent heat of fusion) or a liquid to a gas (latent heat of vaporisation) at its constant transition temperature point.
Which states of matter have the capacity to diffuse cleanly into liquid water?
- (i) Solids
- (ii) Liquids
- (iii) Gases
- (iv) Plasma
✅ Correct Answer
Concept Explanation
Liquids can dissolve and mix with solids (like sugar), other liquids (like ink), and gases (like oxygen). Plasma does not stably mix or diffuse inside liquids under normal environmental conditions.
Which of the following phase transformations are considered bulk phenomena?
- (i) Boiling
- (ii) Evaporation
- (iii) Sublimation
- (iv) Diffusion
✅ Correct Answer
Concept Explanation
Boiling is a bulk phenomenon because the phase change takes place throughout the entire mass of the liquid. Evaporation is distinct because it occurs purely at the surface layer.
Which of the following physical processes depend on a direct change of temperature?
- (i) Melting
- (ii) Boiling
- (iii) Evaporation
- (iv) Sublimation
✅ Correct Answer
Concept Explanation
All four listed thermal processes alter their rates or occur directly as a consequence of changes in temperature, which directly dictates particle kinetic speeds.
Which of the following statements are true regarding particles of matter?
- (i) They have space between them
- (ii) They are continuously moving
- (iii) They attract each other
- (iv) They are easily visible to the naked eye
✅ Correct Answer
Concept Explanation
Particles of matter possess space between them, move constantly via kinetic energy, and attract each other. They are sub-microscopic and completely invisible to the unaided human eye.
Which of the following everyday observations show that gases exert pressure?
- (i) A rubber balloon expands when filled with air
- (ii) A steel gas cylinder safely stores compressed gas
- (iii) A syringe piston moves inward easily when empty
- (iv) Cooking smells spread quickly across a house
✅ Correct Answer
Concept Explanation
The expansion of a balloon and the containment structural strength of gas cylinders show gas particles pushing outward to exert pressure. Piston motion shows compressibility, and spreading smell tracks diffusion.
Match the transformation process in Column A with its correct definition in Column B:
| Column A (Process) | Column B (Definition) |
|---|---|
| (a) Fusion | (1) Gas turning to solid directly |
| (b) Vaporisation | (2) Solid changing to liquid phase |
| (c) Sublimation | (3) Liquid turning to gas state |
| (d) Deposition | (4) Solid turning to gas directly |
✅ Correct Answer
Concept Explanation
The pairings match standard definitions: Fusion is melting, Vaporisation is boiling, Sublimation skips the liquid phase to go solid-to-gas, and Deposition converts gas straight back to solid.
Match the state of matter in Column A with its defining property in Column B:
| Column A (State) | Column B (Property) |
|---|---|
| (a) Solid | (1) Displays maximum compressibility |
| (b) Liquid | (2) Possesses a rigid, fixed shape |
| (c) Gas | (3) Fixed volume but no fixed shape |
✅ Correct Answer
Concept Explanation
Solids keep fixed shapes. Liquids lack a fixed shape but maintain a constant volume. Gases have large intermolecular gaps, making them highly compressible.
Match the physical constant parameter in Column A with its target definition in Column B:
| Column A (Parameter) | Column B (Definition) |
|---|---|
| (a) Melting point | (1) Heat needed to change liquid to gas phase |
| (b) Boiling point | (2) Temperature where a liquid begins boiling |
| (c) Latent heat of fusion | (3) Heat needed to change solid to liquid phase |
| (d) Latent heat of vaporisation | (4) Temperature where a solid melts |
✅ Correct Answer
Concept Explanation
Points mark specific temperatures for phase boundaries. Latent heats measure the invisible structural energy consumed to change states without moving thermal readings.
Match the factor adjustments in Column A with their impacts on evaporation in Column B:
| Column A (Adjustment) | Column B (Impact) |
|---|---|
| (a) Increase in surface area | (1) Increases the evaporation rate |
| (b) Increase in humidity | (2) Decreases the evaporation rate |
| (c) Increase in wind speed | (1) Increases the evaporation rate |
| (d) Increase in temperature | (1) Increases the evaporation rate |
✅ Correct Answer
Concept Explanation
Surface area, wind speed, and temperature direct adjustments carry proportional rate relationships with evaporation. Humidity holds an inverse relationship, slowing vaporization down.
Match the temperature values in Column A with their conversion benchmarks in Column B:
| Column A (Value) | Column B (Benchmark) |
|---|---|
| (a) 273 K | (1) Boiling point of liquid water |
| (b) 373 K | (2) Melting point of ice crystals |
| (c) 0°C | (2) Melting point of ice crystals |
| (d) 100°C | (1) Boiling point of liquid water |
✅ Correct Answer
Concept Explanation
Using $K = ^\circ\text{C} + 273$, we map scale readings across state benchmarks smoothly: $0^\circ\text{C} = 273\text{ K}$ (ice melting point) and $100^\circ\text{C} = 373\text{ K}$ (water boiling point).
Match the chemical process in Column A with its physical description in Column B:
| Column A (Process) | Column B (Description) |
|---|---|
| (a) Diffusion | (1) Surface phenomenon dynamics |
| (b) Evaporation | (2) Bulk phenomenon dynamics |
| (c) Boiling | (3) Spontaneous mixing of moving particles |
| (d) Condensation | (4) State change from gas to liquid |
✅ Correct Answer
Concept Explanation
Diffusion involves moving particle streams mixing spontaneously. Evaporation acts at surface limits, boiling converts the complete liquid volume, and condensation marks gas-to-liquid steps.
Match the substance or item in Column A with its associated description in Column B:
| Column A (Item) | Column B (Description) |
|---|---|
| (a) Solid CO₂ | (1) Sublimation behavior profile |
| (b) Camphor | (2) Absorbs body sweat to aid evaporation cooling |
| (c) Cotton clothes | (3) Dry ice compound name |
| (d) Earthen pot | (4) Cooling water via clay pore evaporation |
✅ Correct Answer
Concept Explanation
Solid carbon dioxide represents dry ice. Camphor undergoes sublimation on heating, while cotton textiles and earthen clay structures utilize surface evaporation trends to produce cooling effects.
Match the state of matter in Column A with its relative particle kinetic energy profile in Column B:
| Column A (State) | Column B (Kinetic Energy level) |
|---|---|
| (a) Solid | (1) Minimum kinetic energy parameters |
| (b) Liquid | (2) Intermediate kinetic energy parameters |
| (c) Gas | (3) Maximum kinetic energy parameters |
✅ Correct Answer
Concept Explanation
Kinetic speeds match structural particle mobility options. Solids hold minimum kinetic levels, liquids move with intermediate freedom, and gas particles possess maximum random speeds.
Match the physical operation name in Column A with its definition description in Column B:
| Column A (Operation) | Column B (Description) |
|---|---|
| (a) Compression | (1) State transition from liquid to solid |
| (b) Melting | (2) Decreasing particle gaps via pressure increase |
| (c) Freezing | (3) State transition from solid to liquid |
| (d) Evaporation | (4) Liquid changes to gas below boiling point |
✅ Correct Answer
Concept Explanation
Compression forces open particle gaps closer together by applying pressure. Melting, freezing, and surface evaporation correspond to standard thermodynamic phase changes.
Match the mixture scenario in Column A with its diffusion phase type in Column B:
| Column A (Mixture) | Column B (Diffusion Type) |
|---|---|
| (a) Oxygen dissolving in water | (1) Diffusion of a solid in a liquid medium |
| (b) Perfume aroma traveling through a room | (2) Diffusion of a liquid in a liquid medium |
| (c) Ink expanding in water | (3) Diffusion of a gas in a liquid medium |
| (d) Sugar mixing in tea | (4) Diffusion of a gas in a gas medium |
✅ Correct Answer
Concept Explanation
Oxygen moving into fluid water shows gas-in-liquid diffusion. Perfume vapor spreading in air is gas-in-gas diffusion, ink tracks liquid-in-liquid, and dissolving sugar shows solid-in-liquid behavior.
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SEBA Class 9 Science Chapter 1 Matter in Our Surroundings MCQs – Important Objective Questions
Mastering Matter in Our Surroundings becomes much easier when students regularly practice well-structured MCQs that reflect the latest SEBA (ASSEB) syllabus. The questions provided above are not just for practice, but are carefully designed to strengthen conceptual clarity and help students understand how objective questions are framed in the actual examination.
By solving these SEBA Class 9 Science Chapter 1 MCQs, students can build a deeper understanding of key topics such as the nature and behaviour of particles, different states of matter, diffusion, temperature conversions, and processes like evaporation and change of state. These are some of the most important areas from which questions are frequently asked, making consistent practice extremely valuable.
One of the biggest advantages of practicing these objective questions is that it improves both accuracy and speed. Students become more confident in selecting the correct answers, avoiding confusion between similar concepts, and handling exam pressure effectively. It also helps in quick revision, especially when time is limited before tests or final exams.
If you are preparing for your school exams or aiming to perform well in the board pattern, regularly revising such important MCQs for Class 9 Science (SEBA) can make a significant difference. Instead of memorizing, focus on understanding the concepts behind each question, as this will help you tackle both objective and descriptive sections with ease.
Keep practicing, stay consistent, and use these MCQs as a reliable resource to strengthen your preparation and score better in your examinations.
FAQs – SEBA Class 9 Science Chapter 1 Matter in Our Surroundings MCQs
1. How many MCQs come from Matter in Our Surroundings in SEBA Class 9 exam?
Usually 3–5 MCQs appear from this chapter out of 45 total MCQs. Focus on concepts like states of matter and temperature conversions.
2. Which are the most important MCQs for SEBA Class 9 Science Chapter 1?
Important MCQs cover evaporation, boiling point, latent heat, and diffusion. Practice chapter-wise questions regularly to improve accuracy.
3. Is Matter in Our Surroundings a difficult chapter for MCQs?
No, it’s easy if concepts are clear. Students mostly confuse temperature units and states, so revise formulas and examples carefully.
4. Are there any numericals in Chapter 1 MCQs for SEBA Class 9 Science?
Yes, simple numericals like Celsius to Kelvin conversion appear. Remember the formula and practice a few sums to avoid silly mistakes.
5. Where can I download SEBA Class 9 Science Chapter 1 MCQs with answers?
You can find chapter-wise MCQs PDFs on Assam Eduverse and similar sites. Always choose updated content based on latest ASSEB guidelines.
6. How to prepare MCQs for Matter in Our Surroundings quickly before exam?
Revise key definitions, practice 30–50 MCQs, and focus on tricky topics like evaporation factors. Assam Eduverse notes are helpful for quick revision.
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