📘 Welcome
Hi User, you have selected Read Mode.
This is Time Free Mode for your convenience to understand every question as per your Ease and Time.
Here You get Answer and Details button. After mastering this mode, you can go for a test with Test Mode on the main page designed especially with Exam Features.
This is Time Free Mode for your convenience to understand every question as per your Ease and Time.
Here You get Answer and Details button. After mastering this mode, you can go for a test with Test Mode on the main page designed especially with Exam Features.
Q1. The particles of matter are described as:
The particles of matter are described as very small. They cannot be seen with the naked eye or even with a simple microscope. Their extremely small size is what allows them to be so numerous and to fit into the spaces between each other.
Q2. Which property of matter is shown by incense smell spreading?
The spreading of incense smell shows the motion of particles. The particles of the incense move through the air and reach our nose. This continuous, random motion of particles is what allows smell to spread.
Q3. The ability of particles to spread evenly shows:
The ability of particles to spread evenly shows that there is space between them and that they are in constant motion. Particles move into the spaces between each other, allowing them to mix and spread uniformly.
Q4. Particles of different substances mix due to:
Particles of different substances mix due to diffusion. Diffusion is the intermixing of particles of two or more substances on their own due to their continuous random motion. This is how smell spreads and how sugar dissolves in water.
Q5. This chapter focuses mainly on matter based on its:
This chapter focuses mainly on matter based on its physical properties. It discusses the particulate nature of matter, states of matter, and how particles behave. These are all physical properties of matter.
Q6. One school of thought believed matter was continuous like:
One school of thought believed matter was continuous like a block of wood. They thought that matter was continuous and could be divided indefinitely without any gaps. This was the ancient belief before the particulate nature was proven.
Q7. Dissolving salt in water shows that matter:
Dissolving salt in water shows that matter is made of particles. The salt particles get into the spaces between the water particles, and the salt disappears from sight. This proves that matter is not continuous but is made up of tiny particles.
Q8. Which of the following is NOT considered matter?
Light is not considered matter because it has no mass and does not occupy space. Sand, air, and food are all examples of matter because they have mass and occupy space. Light is a form of energy.
Q9. Which of the following best supports the particulate nature of matter?
Dissolving sugar in water best supports the particulate nature of matter. When sugar dissolves, its particles get into the spaces between the water particles, showing that matter is made of particles and has spaces between them.
Q10. Modern scientists classify matter based on:
Modern scientists classify matter based on physical and chemical properties. Physical properties include states of matter, solubility, and density. Chemical properties include reactivity and composition. This classification is more scientific and comprehensive.
Q11. Ink spreads faster than honey because:
Ink spreads faster than honey because ink particles move faster. The rate of diffusion depends on the speed of particles. Ink particles are smaller and move more freely, so they spread quickly. Honey particles are larger and move slower, so honey spreads slowly.
Q12. The colour becoming lighter on dilution indicates:
The colour becoming lighter on dilution indicates fewer particles per volume. When a colored solution is diluted, the number of colored particles in a given volume decreases, so the colour becomes lighter. This shows that the particles are spread out.
Q13. Which substance is dissolved in water to demonstrate the particulate nature of matter?
Salt or sugar is dissolved in water to demonstrate the particulate nature of matter. When salt or sugar dissolves, the particles get into the spaces between water particles, proving that matter is made of particles. Oil does not dissolve in water, chalk is insoluble, and ink also shows diffusion but salt and sugar are classic examples.
Q14. One crystal of potassium permanganate contains:
One crystal of potassium permanganate contains millions of particles. This shows how small particles of matter are. Even a tiny crystal can color a large volume of water because it contains an enormous number of particles.
Q15. Diffusion becomes faster on:
Diffusion becomes faster on heating. When heated, particles gain kinetic energy and move faster. This increases the rate of diffusion. Cooling, solidifying, and freezing slow down particle motion and therefore slow down diffusion.
Q16. Ink spreading in water without stirring shows:
Ink spreading in water without stirring shows diffusion. The ink particles move on their own and spread throughout the water due to their continuous random motion. This is a classic demonstration of diffusion.
Q17. What is the characteristic of particles of matter that allows a single crystal to color a large volume of water?
A single crystal of potassium permanganate can color a large volume of water because the particles are very small and numerous. Even a tiny crystal contains millions of particles that can spread throughout the water. This shows the extremely small size and large number of particles in matter.
Q18. Which activity demonstrates that particles are continuously moving?
All of these activities demonstrate that particles are continuously moving. Dilution of a colored solution, dissolving salt in water, and spreading of ink in water all show that particles move and mix on their own due to their continuous motion.
Q19. The idea that matter is particulate helps explain:
The idea that matter is particulate helps explain dissolving substances. When a substance dissolves, its particles get into the spaces between the particles of the solvent. This is explained by the particulate nature of matter.
Q20. Honey spreads slower in water because:
Honey spreads slower in water because its particles move slower. Honey is more viscous, and its particles are larger and more attracted to each other, so they move more slowly. This results in slower diffusion compared to substances like ink.
Q21. The water level does not change much after dissolving salt because:
The water level does not change much after dissolving salt because salt particles occupy the spaces between the water particles. This shows that there is space between particles of matter, and the salt particles fit into these spaces.
Q22. Matter being made of particles explains why substances:
Matter being made of particles explains why substances diffuse. Diffusion is the movement of particles from a region of higher concentration to lower concentration. The particulate nature of matter is the basis for this process.
Q23. Which conclusion is correct according to the text?
According to the text, the correct conclusion is that matter is particulate in nature. Matter is made up of tiny particles, which are continuously moving and have spaces between them.
Q24. Increase in temperature causes particles to:
Increase in temperature causes particles to move faster. When temperature rises, particles gain kinetic energy, which increases their speed of motion. This is why diffusion becomes faster on heating.
Q25. Mixing sugar or salt in water shows that particles have:
Mixing sugar or salt in water shows that particles have space between them. The sugar or salt particles fit into the spaces between the water particles, allowing them to dissolve without significantly changing the water level.
Q26. Particles of matter are:
Particles of matter are always moving. Even in solids, particles are vibrating at their positions. They are in constant motion, which increases with temperature. This continuous motion is a fundamental characteristic of particles.
Q27. Early Indian philosophers classified matter into how many basic elements?
Early Indian philosophers classified matter into five basic elements (Panch Tatva): earth, water, fire, air, and ether (akash). This was an ancient way of understanding the composition of matter.
Q28. When incense is lit, the smell is sensed:
When incense is lit, the smell is sensed at a distance. The particles of the incense spread through the air by diffusion and reach our nose even from far away. This shows that particles are continuously moving.
Q29. When salt dissolves in water, its particles:
When salt dissolves in water, its particles get into the spaces between water particles. The salt particles are small enough to fit into the gaps between the water molecules, which is why the water level does not rise significantly.
Q30. Matter occupies space and has:
Matter occupies space and has mass and volume. Mass is the amount of matter, and volume is the space it occupies. These are the two defining characteristics of matter.
Q31. Matter having mass and volume means it:
Matter having mass and volume means it occupies space. Volume is the measure of space occupied, and mass is the amount of matter. Together, they define the physical existence of matter.
Q32. Ancient Greek philosophers:
Ancient Greek philosophers classified matter similarly to the early Indian philosophers. They also believed that matter was made up of basic elements like earth, water, air, and fire. This shows a common ancient understanding of matter.
Q33. Intermixing of particles on their own is called:
The intermixing of particles on their own is called diffusion. It is the process by which particles move from an area of higher concentration to lower concentration due to their continuous random motion. This happens without any external force.
Q34. The smell being detected after dilution shows:
The smell being detected after dilution shows the small particle size of matter. Even after extreme dilution, the particles of the substance are still present and can be detected because they are very small and numerous.
Q35. Particles of matter are said to possess:
Particles of matter are said to possess kinetic energy because they are in constant motion. This kinetic energy increases with temperature. It is the energy of motion of the particles.
Q36. The smell reaching us from a distance shows particles:
The smell reaching us from a distance shows particles are continuously moving. The particles of the substance travel through the air by diffusion and reach our nose. This would not happen if particles were fixed or stationary.
Q37. Matter exists in surroundings as:
Matter exists in surroundings in three states: solids, liquids, and gases. These are the three physical states of matter that we observe in everyday life.
Q38. Which activity proves matter has space between particles?
All of these activities prove matter has space between particles. Dilution, diffusion, and dissolving all show that particles can move into the spaces between other particles, demonstrating the existence of interparticle spaces.
Q39. Even after many dilutions, the water remains coloured because:
Even after many dilutions, the water remains coloured because particles are very small. A small number of particles are still present even after extreme dilution, and they can still impart colour. This shows the incredibly small size of particles.
Q40. Sugar dissolving in water supports the idea that:
Sugar dissolving in water supports the idea that matter has particles. The sugar particles separate and get into the spaces between the water particles, showing that matter is made up of tiny particles.
Q41. The experiment with potassium permanganate mainly shows:
The experiment with potassium permanganate mainly shows the small size of particles. A tiny crystal can color a large volume of water, demonstrating that the particles are extremely small and numerous.
Q42. The smell of incense spreads due to:
The smell of incense spreads due to diffusion. The particles of incense move through the air by diffusion, spreading the smell to distant places. This is a classic example of diffusion in gases.
Q43. The five basic elements (Panch Tatva) include all EXCEPT:
The five basic elements (Panch Tatva) include earth, water, fire, air, and ether (akash). Metal is not one of the five elements in the ancient Indian classification. It is a substance, not a basic element.
Q44. The other school of thought believed matter was made of particles like:
The other school of thought believed matter was made of particles like sand. They thought of matter as being made up of tiny, indivisible particles, similar to grains of sand. This was the particulate view of matter.
Q45. Particles of matter are smaller than:
Particles of matter are smaller than our imagination. The text emphasizes that the particles of matter are so small that it is hard to imagine their size. They are far smaller than anything we can see or even conceive of without scientific equipment.