Matter in our Surroundings MCQ Class 9 Quiz. These 100 Multiple Choice Questions (MCQ) Quiz on “Matter in our Surroundings” will help you score full marks in your Class 9 Chemistry (Science) exam.
Table of Contents
Fundamentals of Matter: Particles and Properties
Question 1: How did early Indian philosophers classify matter?
A. Based on its chemical composition
B. Into five basic elements: air, earth, fire, sky, and water
C. By observing its physical properties
D. Using scientific experiments
[Answer: B. Early Indian philosophers classified matter into five basic elements: air, earth, fire, sky, and water. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 2: What is the basis of the modern classification of matter?
A. Only physical properties
B. Only chemical nature
C. Both physical properties and chemical nature
D. Neither physical nor chemical properties
[Answer: C. Modern classification of matter is based on both physical properties and chemical nature. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 3: What happens when a small amount of salt is dissolved in a beaker of water?
A. The water level rises significantly.
B. The salt disappears, and the water level remains unchanged.
C. The salt particles spread throughout the water, but the water level doesn’t change noticeably.
D. The salt forms a layer at the bottom of the beaker.
[Answer: C. The salt particles spread throughout the water due to the spaces between water particles, but the water level doesn’t change noticeably. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 4: What can you conclude from the experiment of diluting potassium permanganate in water?
A. Potassium permanganate is not soluble in water.
B. The particles of potassium permanganate are extremely small and can be divided into smaller particles.
C. The color of potassium permanganate fades away on dilution.
D. The water becomes less dense on adding potassium permanganate.
[Answer: B. The experiment shows that the particles of potassium permanganate are extremely small and can be divided into smaller particles. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 5: Why does the smell of hot food reach you several meters away, but you need to go closer to smell cold food?
A. The particles of hot food are larger.
B. The particles of hot food move faster and have more kinetic energy.
C. The air is less dense near hot food.
D. The smell of cold food is weaker.
[Answer: B. The particles of hot food move faster and have more kinetic energy, allowing them to diffuse faster and reach you from a distance. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 6: What does the experiment of dropping ink in water demonstrate?
A. Ink is less dense than water.
B. Water is a universal solvent.
C. The particles of ink are continuously moving and get into the spaces between water particles.
D. Ink does not dissolve in water.
[Answer: C. The experiment demonstrates that the particles of ink are continuously moving and get into the spaces between water particles. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 7: Which of the following activities suggests that particles of matter attract each other?
A. Dissolving salt in water
B. Trying to break an iron nail, a piece of chalk, and a rubber band
C. Diluting potassium permanganate in water
D. Observing the diffusion of ink in water
[Answer: B. Trying to break different materials by hammering, cutting, or stretching suggests that particles of matter have different forces of attraction between them. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 8: Which of the following is NOT a characteristic of solids?
A. Definite shape
B. High compressibility
C. Distinct boundaries
D. Fixed volume
[Answer: B. Solids have negligible compressibility, meaning they cannot be easily compressed. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 9: Why can aquatic animals breathe underwater?
A. They can extract oxygen from water molecules.
B. They have special organs to breathe underwater.
C. There is dissolved oxygen in water, which they can breathe.
D. They don’t need oxygen to survive.
[Answer: C. Gases from the atmosphere, especially oxygen, diffuse and dissolve in water, allowing aquatic animals to breathe. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 10: Why are gases highly compressible compared to solids and liquids?
A. The particles of gases are continuously moving.
B. The particles of gases have the least kinetic energy.
C. The particles of gases have large spaces between them.
D. Gases have a definite shape and volume.
[Answer: C. Gases have large spaces between their particles, allowing them to be compressed into smaller volumes. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
States of Matter and Their Transformations
Question 11: What happens when you heat a solid?
A. The particles of the solid stop vibrating.
B. The kinetic energy of the particles decreases.
C. The particles leave their fixed positions and start moving more freely.
D. The solid becomes less dense.
[Answer: C. When you heat a solid, the kinetic energy of the particles increases, and they start moving more freely, eventually leading to a change of state. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 12: What is the melting point of a substance?
A. The temperature at which a liquid starts boiling.
B. The minimum temperature at which a solid melts to become a liquid at atmospheric pressure.
C. The temperature at which a gas changes into a liquid.
D. The maximum temperature at which a solid can exist.
[Answer: B. The melting point is the minimum temperature at which a solid melts to become a liquid at atmospheric pressure. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 13: What happens to the temperature of a substance during the change of state?
A. It increases steadily.
B. It decreases steadily.
C. It fluctuates up and down.
D. It remains constant.
[Answer: D. The temperature of a substance remains constant during the change of state because the heat energy is used to overcome the forces of attraction between the particles. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 14: What is sublimation?
A. The change of state from solid to liquid.
B. The change of state from liquid to gas.
C. The change of state from solid to gas without changing into a liquid.
D. The change of state from gas to liquid.
[Answer: C. Sublimation is the change of state directly from solid to gas without changing into a liquid state. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 15: What is the effect of pressure on the state of matter?
A. Increasing pressure can change a gas to liquid or solid.
B. Pressure has no effect on the state of matter.
C. Decreasing pressure can change a solid to a liquid.
D. Increasing pressure can change a solid to a gas.
[Answer: A. Increasing pressure can change a gas to liquid or solid by bringing the particles closer together. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 16: What is evaporation?
A. The change of state from liquid to gas at the boiling point.
B. The change of state from solid to gas.
C. The change of state from liquid to gas at any temperature below its boiling point.
D. The change of state from gas to liquid.
[Answer: C. Evaporation is the phenomenon of change of liquid into vapor at any temperature below its boiling point. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 17: Which of the following factors does NOT affect the rate of evaporation?
A. Surface area
B. Temperature
C. The volume of the liquid
D. Humidity
[Answer: C. The volume of the liquid does not affect the rate of evaporation. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 18: Why does your palm feel cold when you put some acetone on it?
A. Acetone has a lower temperature than your palm.
B. Acetone absorbs heat from your palm to evaporate.
C. Acetone reacts with your skin, causing a cooling sensation.
D. Acetone is a good conductor of heat.
[Answer: B. The particles of acetone absorb energy from your palm to evaporate, causing your palm to feel cold. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 19: Why should we wear cotton clothes in summer?
A. Cotton is a good absorber of water and helps in absorbing sweat, which then evaporates and cools the body.
B. Cotton is a good conductor of heat.
C. Cotton clothes are thicker and protect the skin from the sun.
D. Cotton clothes are fashionable.
[Answer: A. Cotton is a good absorber of water and helps in absorbing sweat, which then evaporates and cools the body. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 20: What is the process called when water vapor in the air comes in contact with a cold surface and gets converted to liquid?
A. Evaporation
B. Sublimation
C. Condensation
D. Deposition
[Answer: C. This process is called condensation. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 21: Which activity demonstrates that matter is made up of particles?
A. Observing the shape of a stone
B. Dissolving sugar in water
C. Measuring the temperature of a liquid
D. Weighing an object on a balance
[Answer: B. Dissolving sugar in water demonstrates that matter is made up of particles, as the sugar crystals disappear into the water but retain their sweetness. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Investigating Particle Behavior: Diffusion and Interactions
Question 22: What did early Greek philosophers believe about the nature of matter?
A. Matter is continuous like a block of wood.
B. Matter is made up of tiny indivisible particles.
C. Matter is made up of five basic elements: earth, water, fire, air, and aether.
D. Matter can be created and destroyed.
[Answer: B. Early Greek philosophers believed that matter is made up of tiny indivisible particles, similar to the concept of atoms. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 23: What happens when you add a drop of blue ink to a beaker of water?
A. The ink stays as a single drop at the bottom.
B. The ink slowly spreads throughout the water.
C. The ink immediately mixes with the water and disappears.
D. The ink floats on the surface of the water.
[Answer: B. The ink slowly spreads throughout the water due to the movement of ink particles and the spaces between water particles. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 24: In the experiment of diluting potassium permanganate in water, what happens to the color of the solution with each successive dilution?
A. The color becomes darker.
B. The color remains the same.
C. The color becomes lighter.
D. The color changes to a different hue.
[Answer: C. The color of the solution becomes lighter with each successive dilution, indicating that the potassium permanganate particles are being distributed into a larger volume of water. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 25: Which of the following provides evidence that particles of matter have space between them?
A. A piece of chalk has a definite shape.
B. A gas can be compressed.
C. A solid cannot be easily compressed.
D. A liquid takes the shape of its container.
[Answer: B. The fact that a gas can be compressed suggests that there are spaces between the particles that can be reduced. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 26: What happens when you mix 50 ml of alcohol with 50 ml of water?
A. The total volume becomes 100 ml.
B. The total volume is slightly less than 100 ml.
C. The total volume is slightly more than 100 ml.
D. The mixture separates into two distinct layers.
[Answer: B. The total volume is slightly less than 100 ml because some of the alcohol particles occupy the spaces between the water particles. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 27: Why does the smell of incense stick spread throughout a room?
A. The incense stick particles are attracted to the walls of the room.
B. The air in the room is moving.
C. The particles of the incense stick are continuously moving and mix with the air particles.
D. The smell of the incense stick is carried by dust particles.
[Answer: C. The particles of the incense stick are continuously moving and mix with the air particles due to diffusion. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 28: How does temperature affect the movement of particles?
A. Increasing the temperature slows down the movement of particles.
B. Increasing the temperature makes the particles move faster.
C. Temperature has no effect on the movement of particles.
D. Decreasing the temperature makes the particles move faster.
[Answer: B. Increasing the temperature increases the kinetic energy of the particles, making them move faster. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 29: Which of the following statements is true about the force of attraction between particles of matter?
A. The force of attraction is the same in all types of matter.
B. The force of attraction is strongest in gases.
C. The force of attraction is strongest in solids.
D. There is no force of attraction between particles of matter.
[Answer: C. The force of attraction between particles is strongest in solids, which is why they have a fixed shape and volume. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 30: Why is it difficult to cut the surface of water with your hand?
A. Water is a very dense liquid.
B. The particles of water are very small.
C. There is a strong force of attraction between the particles of water.
D. Water is a good conductor of heat.
[Answer: C. The strong force of attraction between water particles creates surface tension, making it difficult to cut the surface. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Exploring Solids, Liquids, and Gases in Depth
Question 31: Which of the following is a characteristic of a solid?
A. No fixed shape
B. Highly compressible
C. Particles are tightly packed and have a fixed position
D. No definite boundaries
[Answer: C. Solids have a fixed shape and volume because their particles are tightly packed and have a fixed position. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 32: Why can’t you walk through a closed wooden door?
A. The door is too heavy.
B. The particles of the door are tightly packed and do not allow your body’s particles to pass through.
C. The door is made of wood, which is a solid material.
D. The door is painted.
[Answer: B. The particles in the solid door are tightly packed and have strong forces of attraction, preventing your body’s particles from passing through. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 33: A rubber band can be stretched. Is it a solid?
A. No, because it changes shape.
B. Yes, even though it can change shape, it has a definite volume and its particles are closely spaced.
C. Only rigid objects are solids.
D. It is a liquid because it can flow.
[Answer: B. A rubber band is considered a solid because it has a definite volume and its particles are closely spaced, even though it can be stretched. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 34: Which of the following is NOT a characteristic of liquids?
A. They have a fixed volume.
B. They take the shape of the container.
C. They have a definite shape.
D. They can flow.
[Answer: C. Liquids do not have a definite shape; they take the shape of their container. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 35: Why can you pour milk from a jug into a glass?
A. Milk is a solid.
B. Milk particles can move around and slide past each other.
C. Milk has a definite shape.
D. Milk is compressible.
[Answer: B. Milk is a liquid, and its particles can move around and slide past each other, allowing it to flow and be poured. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 36: Why can you smell perfume from a distance?
A. Perfume particles are very large.
B. Perfume particles move very slowly.
C. Perfume particles move very fast and spread out in all directions.
D. Air particles attract perfume particles.
[Answer: C. The particles of perfume move very fast and spread out in all directions, mixing with air particles and reaching your nose. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 37: Why is it easier to compress a gas than a liquid or a solid?
A. Gas particles have strong forces of attraction.
B. Gas particles are closely packed together.
C. Gas particles have large spaces between them.
D. Gases have a fixed shape and volume.
[Answer: C. Gas particles have large spaces between them, allowing them to be compressed into a smaller volume. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 38: What happens to the particles of a gas when it is compressed?
A. They move farther apart.
B. They move closer together.
C. They stop moving.
D. They change their shape.
[Answer: B. When a gas is compressed, the particles are forced closer together, reducing the spaces between them. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 39: What happens to the particles of ice when it melts?
A. They stop moving completely.
B. They start vibrating faster and move away from each other.
C. They become smaller in size.
D. They merge to form a single mass.
[Answer: B. When ice melts, the heat energy causes the particles to vibrate faster and move away from each other, changing the state from solid to liquid. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 40: Why does the temperature remain constant during the melting of ice, even though heat is being supplied continuously?
A. The heat energy is used to break the forces of attraction between the particles.
B. The heat energy is lost to the surroundings.
C. The thermometer is not working properly.
D. The ice absorbs the heat energy without any change in temperature.
[Answer: A. The heat energy supplied during melting is used to overcome the forces of attraction between the particles, hence the temperature remains constant. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Boiling, Evaporation, and Cooling Effects
Question 41: What is the boiling point of a liquid?
A. The temperature at which a solid melts.
B. The temperature at which a liquid starts boiling at atmospheric pressure.
C. The temperature at which a gas condenses.
D. The temperature at which a liquid freezes.
[Answer: B. The boiling point is the temperature at which the vapor pressure of the liquid equals the atmospheric pressure, and the liquid starts boiling. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 42: What happens to the particles of a gas when it is cooled?
A. They move faster.
B. They move slower and come closer together.
C. They disappear.
D. They change their shape.
[Answer: B. Cooling a gas reduces the kinetic energy of the particles, making them move slower and come closer together, which can lead to a change of state. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 43: Why does camphor disappear when kept in open air?
A. It melts and flows away.
B. It undergoes sublimation and changes directly from solid to gas.
C. It evaporates like a liquid.
D. It reacts with the oxygen in the air.
[Answer: B. Camphor disappears because it undergoes sublimation, changing directly from a solid to a gaseous state without passing through the liquid state. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 44: What is dry ice?
A. Frozen water
B. Solid carbon dioxide
C. Solid oxygen
D. Frozen alcohol
[Answer: B. Dry ice is the solid form of carbon dioxide. It gets its name because it sublimates directly to gaseous carbon dioxide without melting into a liquid. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 45: Which of the following conditions will increase the rate of evaporation of water?
A. Keeping the water in a closed container
B. Decreasing the temperature of the water
C. Increasing the surface area of the water
D. Increasing the humidity of the surrounding air
[Answer: C. Increasing the surface area of the water allows more water molecules to escape from the surface, increasing the rate of evaporation. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 46: Why does a wet cloth dry faster on a windy day?
A. The wind increases the humidity of the air.
B. The wind blows away the water molecules from the cloth, increasing the rate of evaporation.
C. The wind decreases the temperature of the cloth.
D. The wind increases the pressure on the water molecules.
[Answer: B. The wind blows away the water molecules that have already evaporated from the cloth, preventing them from condensing back and increasing the rate of evaporation. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 47: Why do we feel cooler when we sprinkle water on the floor in summer?
A. The water makes the floor slippery.
B. The water absorbs heat from the floor and evaporates, causing a cooling effect.
C. The water reflects the sunlight.
D. The water increases the humidity of the air.
[Answer: B. The water sprinkled on the floor absorbs heat from the surroundings and evaporates, taking away the heat and causing a cooling effect. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 48: Why do we sweat when we feel hot?
A. To keep our body hydrated.
B. To release excess water from our body.
C. To regulate our body temperature by evaporation of sweat, which causes cooling.
D. To wash away dirt from our skin.
[Answer: C. Sweating is a natural process to regulate body temperature. When sweat evaporates, it takes away heat from the body, causing a cooling effect. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 49: Why do water droplets appear on the outer surface of a glass containing cold water?
A. The glass is leaking.
B. The water inside the glass is evaporating.
C. The water vapor in the air condenses on the cold surface of the glass.
D. The cold water is attracting water from the air.
[Answer: C. The water vapor present in the air comes in contact with the cold surface of the glass, loses energy, and condenses into liquid droplets. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 50: How does evaporation cause cooling?
A. By releasing heat into the surroundings.
B. By absorbing heat from the surroundings.
C. By increasing the temperature of the surroundings.
D. By decreasing the humidity of the surroundings.
[Answer: B. During evaporation, the particles at the surface of the liquid absorb energy from the surroundings to overcome the forces of attraction and change into the gaseous state, causing a cooling effect. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Particle Behavior in Solutions and Mixtures
Question 51: What happens to the particles of sugar when it dissolves in water?
A. They disappear completely.
B. They break down into smaller particles and spread throughout the water.
C. They settle at the bottom of the container.
D. They transform into water particles.
[Answer: B. The sugar particles break down into smaller particles and spread throughout the water, occupying the spaces between the water particles. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 52: Why does the level of water not change significantly when a small amount of salt is dissolved in it?
A. The salt particles are too large to fit between the water particles.
B. The salt particles occupy the spaces between the water particles.
C. The salt particles evaporate into the air.
D. The salt particles convert into water particles.
[Answer: B. The salt particles are small enough to occupy the spaces between the water particles, so the overall volume doesn’t change significantly. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 53: What can we conclude from the observation that a crystal of potassium permanganate can color a large volume of water?
A. Potassium permanganate is a very strong dye.
B. Water particles are very large.
C. Potassium permanganate particles are very small and can be divided into even smaller particles.
D. Water can dissolve any substance.
[Answer: C. The ability of a tiny crystal to color a large volume of water shows that the potassium permanganate particles are very small and can be further divided. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 54: What happens when we add a spoon of sugar to a cup of tea?
A. The sugar floats on the surface.
B. The sugar particles spread throughout the tea due to the spaces between the tea particles.
C. The sugar particles disappear completely.
D. The level of tea rises significantly.
[Answer: B. The sugar particles dissolve and spread throughout the tea, occupying the spaces between the tea particles. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 55: Why does the smell of food spread from the kitchen to other rooms in the house?
A. The air is moving from the kitchen to other rooms.
B. The food particles are very large and can travel long distances.
C. The food particles mix with the air particles and spread throughout the house due to their continuous movement.
D. The walls of the house are porous and allow food particles to pass through.
[Answer: C. The food particles mix with the air particles and spread throughout the house due to their continuous movement and the spaces between them. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 56: Why does the diffusion of ink in water happen faster in hot water than in cold water?
A. Ink particles are larger in hot water.
B. Ink particles move faster in hot water due to increased kinetic energy.
C. Water particles are smaller in hot water.
D. Hot water has a lower density than cold water.
[Answer: B. In hot water, the ink particles have more kinetic energy, which makes them move faster and diffuse more quickly. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 57: Why is it difficult to break an iron nail with your hands?
A. The iron nail is too thick.
B. The iron nail is smooth and slippery.
C. The particles in the iron nail have a strong force of attraction between them.
D. The iron nail is a good conductor of heat.
[Answer: C. The strong force of attraction between the particles in the iron nail makes it difficult to break with bare hands. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 58: Why do solids have a fixed shape?
A. Their particles can move freely.
B. Their particles are loosely packed.
C. Their particles are tightly packed and have strong forces of attraction.
D. Their particles are constantly changing shape.
[Answer: C. The particles in a solid are tightly packed and have strong forces of attraction, which keeps them in fixed positions and gives the solid a definite shape. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 59: Why is a sponge considered a solid even though it can be compressed?
A. It is soft and has a definite shape.
B. It has minute holes in it, which allow it to be compressed.
C. It is made of a flexible material.
D. It can absorb water.
[Answer: B. A sponge is a solid with minute holes in its structure. When compressed, air from these holes is expelled, allowing it to be squeezed. However, it still retains its structural integrity and has a definite volume. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 60: Why do liquids take the shape of the container they are poured into?
A. Liquid particles have strong forces of attraction.
B. Liquid particles are tightly packed and cannot move.
C. Liquid particles can move around and slide past each other.
D. Liquid particles have a fixed shape.
[Answer: C. Liquid particles have weaker forces of attraction compared to solids, allowing them to move around and take the shape of their container. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Properties of Solids, Liquids, and Gases
Question 61: Why can’t we compress liquids easily?
A. Liquid particles have large spaces between them.
B. Liquid particles have weak forces of attraction.
C. Liquid particles are closely spaced and have less intermolecular space.
D. Liquids can flow easily.
[Answer: C. The particles in a liquid are closely spaced, leaving less intermolecular space, making it difficult to compress them. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 62: Why do gases fill the entire space available to them?
A. Gas particles have a fixed shape.
B. Gas particles have strong forces of attraction.
C. Gas particles move very fast in all directions and have negligible forces of attraction.
D. Gas particles are very large.
[Answer: C. Gas particles have high kinetic energy and negligible forces of attraction, allowing them to move freely and fill the entire space available. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 63: What is the primary reason gases are highly compressible?
A. Gas particles are very small.
B. Gas particles have strong forces of attraction.
C. Gas particles have large intermolecular spaces.
D. Gas particles can change their shape.
[Answer: C. The large intermolecular spaces in gases allow the particles to be brought closer together when compressed. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 64: What happens when we heat water?
A. The water particles move slower.
B. The water particles gain energy and move faster, eventually changing into a gaseous state.
C. The water particles become smaller in size.
D. The water particles stop moving.
[Answer: B. When we heat water, the water particles gain energy and move faster. This increased movement weakens the forces of attraction between the particles, and eventually, they change into a gaseous state. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 65: What is the term used for the amount of heat energy required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point?
A. Latent heat of vaporization
B. Latent heat of fusion
C. Specific heat capacity
D. Heat of combustion
[Answer: B. The amount of heat energy required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is called the latent heat of fusion. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 66: What happens to the temperature of a substance while it is boiling?
A. It keeps increasing.
B. It keeps decreasing.
C. It remains constant.
D. It fluctuates up and down.
[Answer: C. The temperature of a substance remains constant during boiling because the heat energy supplied is used to overcome the forces of attraction between the particles and change the state from liquid to gas. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 67: What is the process called when a gas changes directly into a solid without passing through the liquid state?
A. Sublimation
B. Evaporation
C. Deposition
D. Condensation
[Answer: C. The process of a gas changing directly into a solid without passing through the liquid state is called deposition. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 68: How does increasing pressure affect the boiling point of a liquid?
A. It decreases the boiling point.
B. It has no effect on the boiling point.
C. It increases the boiling point.
D. It causes the liquid to freeze.
[Answer: C. Increasing pressure increases the boiling point of a liquid. This is because higher pressure makes it more difficult for the liquid particles to escape into the gaseous state. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 69: Why do clothes dry faster when spread out?
A. Spreading out clothes reduces the surface area of the wet cloth.
B. Spreading out clothes increases the surface area of the wet cloth, exposing more water molecules to the air and increasing the rate of evaporation.
C. Spreading out clothes decreases the temperature of the cloth.
D. Spreading out clothes prevents the wind from blowing on them.
[Answer: B. Spreading out clothes increases the surface area of the wet cloth, exposing more water molecules to the air and increasing the rate of evaporation. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 70: Why does nail polish remover evaporate quickly?
A. It has a low boiling point and weak forces of attraction between its particles.
B. It has a high boiling point.
C. It has strong forces of attraction between its particles.
D. It is a viscous liquid.
[Answer: A. Nail polish remover has a low boiling point and weak forces of attraction between its particles, allowing it to evaporate quickly. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Changes of State and Everyday Phenomena
Question 71: Why does evaporation cause cooling?
A. The particles at the surface of the liquid release energy to the surroundings when they evaporate.
B. The particles at the surface of the liquid absorb energy from the surroundings to evaporate.
C. Evaporation increases the temperature of the surroundings.
D. Evaporation has no effect on the temperature of the surroundings.
[Answer: B. The particles at the surface of the liquid absorb energy from the surroundings to overcome the forces of attraction and change into the gaseous state. This absorption of energy causes a cooling effect. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 72: Why do we feel cooler after taking a shower?
A. The water washes away the dirt and sweat.
B. The water droplets on our skin evaporate and absorb heat from our body, causing a cooling effect.
C. The water makes our skin wet.
D. The water increases the humidity of the air around us.
[Answer: B. When we take a shower, the water droplets left on our skin evaporate. During evaporation, these droplets absorb heat from our body, causing a cooling sensation. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 73: Why is it advisable to wear light-colored clothes in summer?
A. Light-colored clothes absorb more heat than dark-colored clothes.
B. Light-colored clothes reflect more heat than dark-colored clothes, keeping us cooler.
C. Light-colored clothes are thinner than dark-colored clothes.
D. Light-colored clothes allow more air to pass through them.
[Answer: B. Light-colored clothes reflect more heat and light than dark-colored clothes, which absorb more heat. This helps in keeping us cooler during summer. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 74: What is matter?
A. Anything that has mass and occupies space.
B. Only living things.
C. Only non-living things.
D. Anything that can be seen with the naked eye.
[Answer: A. Matter is defined as anything that has mass and occupies space. This includes all living and non-living things, regardless of whether they are visible to the naked eye. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 75: How did early Indian philosophers classify matter?
A. Based on their physical properties.
B. Based on their chemical properties.
C. Into five basic elements: air, earth, fire, sky, and water.
D. Into three states of matter: solid, liquid, and gas.
[Answer: C. Early Indian philosophers classified matter into five basic elements, known as the “Panch Tatva”: air, earth, fire, sky, and water. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 76: In the potassium permanganate dilution experiment, what happens when the solution is further diluted with more water?
A. The color disappears completely.
B. The color becomes more intense.
C. The color becomes lighter but still remains visible.
D. The water becomes cloudy.
[Answer: C. Even after repeated dilutions, the color of the potassium permanganate solution remains visible, although it becomes lighter, indicating the presence of extremely small particles. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 77: What can you conclude from the experiment where a small amount of sugar dissolves completely in a glass of water without any significant change in the water level?
A. Sugar particles are very large.
B. Water particles are very small.
C. Sugar particles occupy the spaces between the water particles.
D. Sugar disappears completely when dissolved in water.
[Answer: C. The experiment shows that sugar particles are small enough to occupy the spaces between water particles, explaining why the water level doesn’t rise significantly. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 78: Why does a drop of ink spread throughout the water even without stirring?
A. Ink particles are attracted to water particles.
B. Water particles push the ink particles around.
C. Ink particles are continuously moving and get into the spaces between water particles.
D. Ink particles are lighter than water particles.
[Answer: C. Ink particles are in a state of continuous motion, and this movement allows them to spread throughout the water by occupying the spaces between water particles. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 79: Why is it easier to break a piece of chalk than an iron nail?
A. Chalk particles are larger than iron particles.
B. The force of attraction between chalk particles is weaker than that between iron particles.
C. Chalk particles are continuously moving, while iron particles are not.
D. Chalk has a lower melting point than iron.
[Answer: B. The force of attraction between particles varies in different substances. In chalk, this force is weaker, making it easier to break compared to an iron nail where the force of attraction between particles is stronger. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 80: Which of the following is NOT an example of a solid?
A. A brick
B. A pen
C. Milk
D. A book
[Answer: C. Milk is a liquid, not a solid. Solids have a fixed shape and volume, while liquids take the shape of their container. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Matter: From Ancient Views to Modern Applications
Question 81: Why are solids generally incompressible?
A. Because their particles have weak forces of attraction.
B. Because their particles are loosely packed.
C. Because their particles are closely packed and have strong forces of attraction.
D. Because their particles can move freely.
[Answer: C. The particles in solids are closely packed and have strong forces of attraction, leaving little space between them. This makes it difficult to compress them further. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 82: What happens to the particles of a liquid when it is heated?
A. They move slower.
B. They gain energy and move faster.
C. They come closer together.
D. They stop moving.
[Answer: B. When a liquid is heated, its particles gain energy and move faster. This increased movement can eventually lead to a change of state from liquid to gas. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 83: Why can liquids flow?
A. Their particles have strong forces of attraction.
B. Their particles are tightly packed and cannot move.
C. Their particles can move around and slide past each other.
D. Their particles have a fixed shape.
[Answer: C. The ability of liquid particles to move around and slide past each other allows liquids to flow and take the shape of their container. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 84: Which of the following is a characteristic of gases?
A. They have a fixed shape.
B. They have a fixed volume.
C. They can be compressed easily.
D. They cannot diffuse.
[Answer: C. Gases have large intermolecular spaces, which allows them to be compressed easily. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 85: Why do we use perfumes?
A. Because perfume particles are very large.
B. Because perfume particles move very slowly.
C. Because perfume particles diffuse quickly in air and their fragrance reaches us.
D. Because perfume particles are attracted to our skin.
[Answer: C. Perfumes work because their particles diffuse quickly in the air, allowing the fragrance to spread and reach us. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 86: What happens to ice when it is left at room temperature?
A. It remains as ice.
B. It changes into water.
C. It disappears completely.
D. It changes directly into water vapor.
[Answer: B. At room temperature, which is typically higher than the melting point of ice, the ice absorbs heat energy and changes into water. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 87: What is the term used for the temperature at which a solid changes into a liquid at atmospheric pressure?
A. Boiling point
B. Melting point
C. Freezing point
D. Condensation point
[Answer: B. The temperature at which a solid changes into a liquid at atmospheric pressure is known as its melting point. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 88: Why does the temperature remain constant during the melting of a solid, even though heat is being supplied?
A. Because the heat energy is being used to increase the kinetic energy of the particles.
B. Because the heat energy is being used to overcome the forces of attraction between the particles.
C. Because the solid is not absorbing any heat energy.
D. Because the thermometer is faulty.
[Answer: B. During the melting process, the heat energy supplied is used to overcome the forces of attraction between the particles, causing them to move apart and change their state. This is why the temperature remains constant. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 89: What happens to the particles of a gas when pressure is applied to it?
A. They move faster and farther apart.
B. They move slower and come closer together.
C. They disappear.
D. They change their shape.
[Answer: B. Applying pressure to a gas forces the particles closer together, reducing the intermolecular spaces and potentially leading to a change of state. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 90: What is the name of the process in which a solid changes directly into a gas without passing through the liquid state?
A. Evaporation
B. Condensation
C. Sublimation
D. Melting
[Answer: C. Sublimation is the process where a solid changes directly into a gas without passing through the liquid state. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Evaporation, Condensation, and Energy Exchange
Question 91: Which of the following factors affects the rate of evaporation?
A. Color of the liquid
B. Temperature
C. Volume of the liquid
D. Shape of the container
[Answer: B. Temperature affects the rate of evaporation. Higher temperatures increase the kinetic energy of the liquid particles, making them escape faster and increasing the rate of evaporation. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 92: Why does a wet cloth dry faster on a hot summer day compared to a cold winter day?
A. Because the humidity is higher in summer.
B. Because the temperature is higher in summer, leading to faster evaporation.
C. Because there is more wind in summer.
D. Because the air pressure is lower in summer.
[Answer: B. Higher temperatures increase the kinetic energy of water molecules in the wet cloth, allowing them to escape faster and leading to a quicker drying time. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 93: Why do we feel a cooling sensation when we apply perfume on our skin?
A. Because perfume has a lower temperature than our body.
B. Because perfume absorbs heat from our body to evaporate.
C. Because perfume reacts with our skin.
D. Because perfume blocks the sunlight.
[Answer: B. When we apply perfume, it absorbs heat energy from our body to evaporate. This absorption of heat causes a cooling sensation on our skin. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 94: Why do dogs pant on a hot day?
A. To release excess water from their body.
B. To cool their body by the evaporation of saliva from their tongue.
C. To breathe faster and get more oxygen.
D. To communicate with other dogs.
[Answer: B. Panting allows dogs to evaporate saliva from their tongue. This evaporation process absorbs heat from their body, helping them to cool down on a hot day. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 95: What is the process of conversion of water vapor into water called?
A. Evaporation
B. Sublimation
C. Condensation
D. Melting
[Answer: C. The process of conversion of water vapor into water is called condensation. This happens when water vapor comes into contact with a cooler surface and loses energy. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 96: Which of these is NOT an example of matter?
A. Air
B. Sunlight
C. Water
D. A book
[Answer: B. Sunlight is a form of energy, not matter. Matter is anything that has mass and occupies space. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 97: According to ancient Greek philosophers, what was matter made up of?
A. Five basic elements: air, earth, fire, water, and aether
B. Tiny indivisible particles called atoms
C. A continuous substance like a block of wood
D. Energy and forces
[Answer: B. Ancient Greek philosophers believed that matter was composed of tiny indivisible particles called atoms. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 98: What does the experiment of dissolving potassium permanganate in water demonstrate about the size of the particles?
A. The particles of potassium permanganate are very large.
B. The particles of potassium permanganate are very small and can be divided into smaller particles.
C. The size of the particles cannot be determined from this experiment.
D. The particles of potassium permanganate dissolve completely and disappear.
[Answer: B. The experiment demonstrates that the particles of potassium permanganate are very small and can be divided into smaller particles as they spread throughout the water, giving it a color even when highly diluted. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 99: What happens when you mix 50 ml of water and 50 ml of alcohol?
A. The total volume becomes exactly 100 ml.
B. The total volume is slightly less than 100 ml.
C. The total volume is slightly more than 100 ml.
D. The water and alcohol separate into two distinct layers.
[Answer: B. The total volume is slightly less than 100 ml because some of the alcohol particles occupy the spaces between the water particles. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Question 100: Why does the smell of incense sticks spread throughout a room?
A. Because the incense stick is burning.
B. Because the particles of the incense stick are continuously moving and mix with the air particles.
C. Because the air in the room is still.
D. Because the incense stick is fragrant.
[Answer: B. The particles of the incense stick are continuously moving, and this movement allows them to mix with the air particles and spread throughout the room. ] (Matter in our Surroundings MCQ Class 9 by Top100MCQ.com)
Most Asked Important Questions on “Matter in our Surroundings“
What are the three states of matter?
The three states of matter are solid, liquid, and gas.
What is the difference between the arrangement of particles in solids, liquids, and 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.
What is the latent heat of fusion?
The latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point.
What is the latent heat of vaporization?
Latent heat of vaporization is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its boiling point.
What is the process of sublimation?
Sublimation is the change of solid state directly to gaseous state without going through liquid state.