Particulate Nature of Matter Class 8 Worksheet with Answers Science Chapter 7
Our subject specific Class 8 Science Worksheet and Class 8 Science Curiosity Chapter 7 Particulate Nature of Matter Worksheet with Answers Pdf are aligned with latest patterns. Class 8 Particulate Nature of Matter Worksheet Worksheet On Particulate Nature of Matter Class 8 Particulate Nature of Matter Worksheet Class 8 A. Objective Type Questions Multiple Choice […]
Our subject specificClass 8 Science Worksheetand Class 8 Science Curiosity Chapter 7 Particulate Nature of Matter Worksheet with Answers Pdf are aligned with latest patterns. Worksheet On Particulate Nature of Matter Class 8Particulate Nature of Matter Worksheet Class 8A. Objective Type QuestionsMultiple Choice QuestionsQuestion 1. Which of the following observations best supports the idea that matter is made up of tiny particles?(a) A sponge absorbs water. (b) Sugar disappears when stirred into water. (c) A balloon bursts when pricked. (d) A mirror reflects light. Answer:(b) Sugar disappears when stirred into water. Question 2. What does the persistence of taste in powdered sugar even after grinding show?(a) Matter cannot be divided. (b) Sugar is soluble in air. (c) Particles of sugar retain their properties. (d) Grinding alters sugar chemically. Answer:(c) Particles of sugar retain their properties. Question 3. Particles of matter show the following characteristics:I. They are continuously moving. II. They attract each other. III. They have large spaces in solids. Choose the correct option:(a) Both I and II(b) Both I and III(c) Both II and III(d) I, II and IIIAnswer:(a) Both I and IIQuestion 4. Ice melts at 0°C, whereas iron melts at 1538°C. What does this difference in melting points tell us about the particles in these solids?(a) Ice particles are more tightly packed than iron particles(b) Iron has stronger interparticle forces than ice(c) Ice contains gases, so it melts faster(d) Melting point does not depend on particle arrangementAnswer:(b) Iron has stronger interparticle forces than iceQuestion 5. A student heated some ice cubes in a beaker. As the ice melted into water and later boiled into steam, she observed several changes in particle movement. What caused the ice to melt into water during heating?(a) Particles decreased in size(b) Particles gained energy and vibrated more(c) Particles became heavier(d) Particles lost energyAnswer:(b) Particles gained energy and vibrated moreQuestion 6. Which of the following correctly represents the sequence of changes jsJieat is continuously supplied to ice?(a) Ice → Steam → Water(b) Steam → Water Ice(c) Ice → Water → Steam(d) Water → Ice → SteamAnswer:(c) Ice → Water → SteamQuestion 7. Read the statements given below about changes in states of matter. (i) On heating, solids change into liquids due to an increase in kinetic energy of particles. (ii) Liquids on cooling lose energy and change into solids. (iii) Gases can never be liquefied by applying pressure. (iv) Change of state is a physical change. Choose the combination of statements which are true. (a) (i), (ii), (iv)(b) (ii), (iii), (iv)(c) (i), (ii), (iii)(d) (i), (iii), (iv)Answer:(a) (i), (ii), (iv)Question 8. What change in interparticle attraction is observed when ice turns to steam?(a) It becomes stronger(b) It remains unchanged(c) It becomes weaker(d) It becomes maximumAnswer:(c) It becomes weakerQuestion 9. A substance has a fixed volume but no fixed shape. It takes the shape of the container it is poured into but cannot be compressed easily. This substance is most likely to be(a) gas(b) liquid(c) ice(d) woodAnswer:(b) liquidQuestion 10. Water starts boiling at 100°C and forms bubbles rapidly. What is the best description of this change?(a) Particles stop moving and settle at the bottom(b) Energy decreases and particles stick together(c) Particles gain energy, overcome forces and escape as vapour(d) Water becomes heavier and sinksAnswer:(c) Particles gain energy, overcome forces and escape as vapourQuestion 11. Observe the diagram of particle arrangements given below :Which state of matter does arrangement C represent?(a) Solid(b) Liquid(c) Gas(d) PlasmaAnswer:(c) GasQuestion 12. Which of the following shows the correct order of increasing interparticle spacing among the three states of matter: solid, liquid and gas?(a) Solid < Liquid < Gas(b) Gas < Liquid < Solid(c) Liquid < Solid < Gas(d) Solid = Gas < LiquidAnswer:(a) Solid < Liquid < GasQuestion 13. A student observed that potassium permanganate spread faster in warm water than in cold water. This happened because(a) particles in cold water are heavier. (b) particles in warm water move faster due to heat. (c) potassium permanganate dissolves only in hot water. (d) water changes state in warmth. Answer:(b) particles in warm water move faster due to heat. Question 14. Study the following table. States of MatterParticle MovementI. SolidFree movement in all directionsII. LiquidVibrate in fixed positionsIII. GasSlide past each otherWhich of the above states are incorrectly matched with their particle movement?(a) I and II(b) I and III(c) II and III(d) I, II and IIIAnswer:(d) I, II and IIIQuestion 15. Why does the smell of freshly cooked food spread from the kitchen to other rooms?(a) Food particles are lighter than air. (b) Gases produced during cooking dissolve in air instantly. (c) Air particles carry heat and not smell. (d) Gas particles from food move freely and mix with air particles. Answer:(d) Gas particles from food move freely and mix with air particles. Class 8 Science Curiosity Chapter 7 WorksheetAssertion-Reason QuestionsThe questions given below consist of an Assertion and a Reason. Based on that, choose the appropriate option. (a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. (c) Assertion is true, but Reason is false. (d) Assertion is false, but Reason is true. Question 1. Assertion: All matter is made up of extremely small particles that are not visible to the naked eye. Reason: Grinding chalk into fine powder changes its form but not its basic properties. Answer:(b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. Explanation:Matter is composed of tiny particles that are invisible to the naked eye. However, grinding chalk into powder does not destroy its basic nature; the smallest particles still retain the properties of chalk. Thus, both assertion and reason are true but reason is not the correct explanation of assertion. Question 2. Assertion: Solids have a definite shape and a fixed volume. Reason: The particles in solids are tightly packed and can only vibrate about their fixed positions. Answer:(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. Question 3. Assertion: Liquids do not have a fixed shape but maintain a fixed volume. Reason: In liquids, the particles are tightly packed and cannot move past one another, allowing them to flow. Answer:(c) Assertion is true, but Reason is false. Explanation:Liquids have a definite volume but no fixed shape. The reason is incorrect because liquid particles are not tightly packed like solids — they can slide past one another. Thus, assertion is true, but reason is false. Question 4. Assertion: Gases can be compressed much more easily than solids or liquids. Reason: Gas particles are widely spaced and have very weak forces of attraction between them. Answer:(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. Question 5. Assertion: The fragrance of incense sticks spreads quickly throughout the room. Reason: Gas particles move freely and rapidly in all directions, causing them to mix and spread easilyAnswer:(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. Fill in the BlanksQuestion 1. Fill in the blanks by choosing the appropriate words from the box given below. arrangement container, movement, space, matter,spread, compressible, heat, vibrate, properties(a) All substances around us are made up of tiny particles, which combine to form _______ and are responsible for its different _______. Answer:matter, properties(b) In solids, particles are tightly packed in a fixed _______ and they only _______ in their positions. Answer:arrangement, vibrate(c) Liquids do not have a fixed shape and take the shape of the _______ but their particles have less force of attraction and more freedom of _______ than solids. Answer:container, movement(d) Gases have large interparticle _______ and are highly _______ making them very different from solids and liquids. Answer:space, compressible(e) The particles of matter move faster on increasing the _______, and this affects how quickly they _______ in any medium. Answer:heat, spreadQuestion 2. Fill in the blanks by unjumbling the words given in the bracket. (a) The _______ (mntgaeerarn) of particles decides the state of matter. Answer:arrangement(b) Solids have a fixed _______ (pseah) and volume. Answer:shape(c) The force between particles is strongest in a _______ (idslos). Answer:solids(d) Particles of a _______ (iduliq) can slide past one another. Answer:liquid(e) The state in which particles move in all directions is called _______ (gsa). Answer:gasTrue/FalseQuestion 1. Write ‘T’ for true and ‘F’ for false in front of the following statements. (a) The arrangement and movement of particles in matter help to determine whether it is solid, liquid or gas. Answer:True(b) The particles in solids are so closely packed that they cannot move from one place to another. Answer:True(c) Liquids can be compressed easily because there is a large amount of space between their particles. Answer:FalseReason: Liquids cannot be compressed easily because their particles are already closely packed, though not as tightly as in solids. (d) Gases do not have a fixed volume because their particles are free to move in all directions. Answer:True(e) A substance always changes its state when it is exposed to air. Answer:FalseReason: A substance does not change its state just by being exposed to air. Change of state requires change in temperature or pressure. Question 2. Put a tick with a green sketch pen if the statement is correct about states of matter. (a) Solids have definite shape and volume due to tightly packed particles. Answer:✓(b) Liquids take the shape of the container they are placed in but retain their own volume. Answer:✓(c) The boiling point of a substance is the temperature at which a gas changes into liquid. Answer:✗Reason: Boiling point is the temperature at which a liquid changes into gas and not gas into liquid. (d) Gases exert pressure on the walls of the container because their particles collide with each other and the walls. Answer:✓(e) All substances expand when cooled, and contract when heated. Answer:✗Reason: Most substances expand when heated and contract when cooled and not the other way around. Question 3. Choose the option which shows the correct sequence of True (T) and False (F) for the statements given below:(a) Particles of matter are too small to be seen with the naked eye. (b) Particles of matter are always at rest. (c) There are large spaces between the particles of matter. (d) Particles in solids can move freely in all directions. (e) The particles of matter attract each other. (f) Water vapour contains tightly packed particles. (1) T F T F T F(2) T T F T F T(3) F F T T T F(4) T F T F T FAnswer:(4) T F T F T FMatch the FollowingQuestion 1. Match the terms given in Column I with the phrases given in Column II. Column I (Terms)Column II (Property)(a) Solid(i) No fixed shape but fixed volume(b) Liquid(ii) Particles move freely and are compressible(c) Gas(iii) Fixed shape and fixed volume(d) Boiling point(iv) Rapid change of liquid into vapour(e) Melting point(v) Temperature where solid turns to liquid(a) _______(b) _______(c) _______(d) _______(e) _______Answer:Column I (Terms)Column II (Property)(a) Solid(iii) Fixed shape and fixed volume(b) Liquid(i) No fixed shape but fixed volume(c) Gas(ii) Particles move freely and are compressible(d) Boiling point(iv) Rapid change of liquid into vapour(e) Melting point(v) Temperature where solid turns to liquidQuestion 2. Match the terms given in Column I with the phrases given in Column II. Column I (Property/Example)Column II (Explanation)(a) Ice melts at 0°C(i) Strong interparticle forces(b) High boiling point(ii) Melting point of ice(c) Low melting point(iii) Helps particles escape into air as gas(d) Constant temperature during melting(iv) Substance melts easily(e) Heat energy at boiling point(v) Energy used to break forces, not raise temperature(a) _______(b) _______(c) _______(d) _______(e) _______Answer:Column I (Property/Example)Column II (Explanation)(a) Ice melts at 0°C(ii) Melting point of ice(b) High boiling point(i) Strong interparticle forces(c) Low melting point(iv) Substance melts easily(d) Constant temperature during melting(v) Energy used to break forces, not raise temperature(e) Heat energy at boiling point(iii) Helps particles escape into air as gasQuestion 3. A. _______B. _______C. _______B. Subjective Type QuestionsDefine the Following Terms1. Matter_____________________________2. Constituent particles_____________________________3. Interparticle spacing_____________________________4. Interparticle forces_____________________________5. Melting point_____________________________6. Boiling point_____________________________Give Reasons for the Following1. Solids have a fixed shape and volume, while gases do not. _____________________________2. Liguids are able to flow and take the shape of the container, but still maintain a fixed volume. _____________________________3. Gases can be compressed easily, but solids and liquids cannot. _____________________________Very Short Answer Type QuestionsQuestion 1. What is matter made up of according to ancient Indian philosopher Acharya Kanad?_____________________________Question 2. What kind of force holds particles together in a solid?_____________________________Question 3. What are the particles in solids able to do despite being fixed in position?_____________________________Question 4. Form a sentence using the following words, particles, tightly, solids, packed, vibrate. _____________________________Question 5. What do we call the temperature at which a solid changes to a liquid?_____________________________Question 6. Name the state of matter that has a definite volume but no definite shape. _____________________________Question 7. Which state of matter has particles that are far apart and move freely in all directions?_____________________________Question 8. Why do gases have no fixed volume?_____________________________Question 9. Why can gases be compressed easily, but not solids?_____________________________Question 10. Observe the image of an incense stick emitting smoke. What property of gas particles does this demonstrate?_____________________________Short Answer Type QuestionsQuestion 1. Rearrange the words to form meaningful scientific sentences:(a) particles / matter / tiny / of / is / made / up_____________________________(b) move / gases / directions / in / all / freely / can_____________________________Question 2. During an activity, Rahul added a spoon of sugar to water and stirred, It disappeared. How does this support the idea of matter being made up of particles?_____________________________Question 3. There is a conversation between two students of Class 8. Read and answer what does this conversation tell us about the shape of liquids?Ravi Liquids can flow, but do they have a fixed shape like solids?Anita I don’t think so. They seem to take the shape of any container. _____________________________Question 4. Aman was curious to know why water takes the shape of any container but does not spread like air. What explanation would you give based on the nature of its particles?_____________________________Question 5. Justify the following statements. (a) “Liquids take the shape of the container in which they are poured. ”_____________________________(b) “Gas particles are far apart from each other. ”_____________________________Question 6. The solid iodine kept in a closed jar slowly turned into vapour. What does this tell you about the arrangement and energy of particles in solids?_____________________________Question 7. During an activity, air was compressed in a syringe. What did this show about the space between gas particles?_____________________________Question 8. Study the images given below and answer the question that followsIdentify the states of matter represented by each image and explain the differences in the interparticle forces. __________________________________________________________Question 9. Complete the following table based on your understanding of the three states of matter:(a) _______(b) _______(c) _______Question 10. A teacher sprayed air freshener in one corner of the room. Students at the other end could smell it within seconds. What process of particle behaviour does this activity demonstrate?__________________________________________________________Long Answer Type QuestionsQuestion 1. What do you understand by the term particulate nature of matter? Explain with the help of two daily life examples. ____________________________________________________________________________Question 2. Compare the arrangement, movement, and spacing of particles in solids, liguids and gases with the help of a neat and well-labelled diagram. ____________________________________________________________________________Question 3. Look at the images and names the materials given below. Based on your understanding of the properties of solids and liguids, classify each item into the correct group. Question 4. Explain the behaviour of particles of matter in the following situations:(a) When salt is dissolved in water____________________________________________________________________________(b) When air is filled into a balloon____________________________________________________________________________Question 5. Complete the flowchart on different states of matter by filling (a), (b) and (c). Case Based QuestionsQuestion 1. Ritu took two identical beakers and labelled them as X and Y. She filled both with the same amount of water. In beaker X, she added sugar and stirred well. In beaker Y, she added sand and stirred. After some time, she observed that the mixture in X looked clear while in Y, the particles settled at the bottom. Which beaker shows that the solute has completely mixed with the solvent?(a) Beaker Y, because sand particles dissolve slowly. (b) Beaker X, because sugar particles are invisible. (c) Beaker Y, because particles are heavier. (d) Beaker X, because sugar dissolves completely to form a solution. Answer:(d) Beaker X, because sugar dissolves completely to form a solution. Question 2. Read the paragraph and answer the following questions:Rahul was observing his mother while she was boiling water to make tea. He noticed small bubbles forming at the bottom of the kettle. After a while, the water started bubbling more vigorously, and steam began to rise from the surface. Curious, Rahul asked why the water looked still at first and then started bubbling. I. What does the appearance of bubbles during boiling indicate?(a) Water is changing into gas from the bottom(b) Water is mixing with air(c) Water particles are settling down(d) The temperature of water is decreasingAnswer:(a) Water is changing into gas from the bottomII. Which process is mainly happening when water turns to steam?(a) Condensation(b) Melting(c) Boiling(d) FreezingAnswer:(c) BoilingQuestion 3. A student observed three different samples placed on a table and noted their physical state and behaviour. The table below shows her observations. SampleObservationI. Has a fixed shape and volume. II. Takes the shape of container but has fixed volume. III. Fills the entire container and can be compressed easily. Which of the following correctly matches the samples with their states based on their particle arrangement and movement?(a) I – Solid, II – Liquid, III – Gas(b) I – Liquid, II – Solid, III – Gas(c) I – Gas, II – Liquid, III – Solid(d) I – Solid, II – Gas, III – LiquidAnswer:(a) I – Solid, II – Liquid, III – GasQuestion 4. Read the passage given below and answer the questions that follows. Reema was helping her mother to prepare lemonade. She added sugar to water and stirred it well. After a few minutes, the sugar completely disappeared. Reema was surprised and asked her mother where the sugar went, as she could no longer see it. (a) What property of matter does this activity demonstrate?____________________________________________________________________________(b) What does the disappearance of sugar from water tell us about the nature of particles?____________________________________________________________________________Question 5. Read the passage given below and answer the questions that follow. Anu filled a balloon with air and tied it. Then, she tried pressing the balloon gently from both sides and noticed that it changed shape. Her friend Meena tried the same thing with a wooden block but it did not change its shape. (a) Why was the balloon easily compressed while the wooden block was not?____________________________________________________________________________(b) What does this activity tell us about the arrangement of particles in solids and gases?____________________________________________________________________________Skill Based ActivitiesQuestion 1. Answer the following statements by completing the word given below each statement. A. The term used by ancient Indian philosopher Acharya Kanad to describe the smallest indivisible particle of matter. B. The temperature at which a solid changes into liquid. C. A state of matter in which particles are tightly packed and have a definite shape. D. The temperature at which a liquid turns into vapour quickly. E. These have neither fixed shape nor fixed volume and can be compressed easily. Answer:A. PARMANUB. MELTINGC. SOLIDD. BOILINGE. GASESQuestion 2. Find the odd one out and justify your answer,(a) Water, Oil, Juice, Stone_____________________________Answer:StoneStone is a solid with a fixed shape and tightly packed particles, while water, oil and juice are liquids that can flow and take the shape of the container. (b) Air, Steam, Oxygen, Rock_____________________________Answer:RockRock is a solid, whereas air, steam and oxygen are gases with particles that are far apart and move freely in all directions. (c) Ice, Sugar, Stone, Vinegar_____________________________Answer:VinegarVinegar is a liquid that flows and takes the container’s shape, while ice, sugar and stone are solids with definite shape and closely packed particles. Question 3. Complete the crossword puzzle with the help of the clues given below:AcrossDown1. The property of gases due to which they can be pressed into a smaller volume. 2. The temperature at which a liquid changes into a gas. 3. A state of matter that flows and takes the shape of the container but has a fixed volume. 5. Tiny units that make up all matter and they are very small and always in motion. 4. A state of matter that has a fixed shape and fixed volume. 6. The temperature at which a solid changes into a liquid. Answer:(i) particles(ii) particles(iii) heat(iv) vibrate(v) freely(vi) intermolecular1. Compressibility2. Boiling point3. Liquid4. Solid5. Particles6. Melting point