Matter in our Surroundings MCQ Class 9

Correct Answer: B. Early Indian philosophers classified matter into five basic elements: air, earth, fire, sky, and water.

Correct Answer: C. Modern classification of matter is based on both physical properties and chemical nature.

Correct Answer: C. The salt particles spread throughout the water due to the spaces between water particles, but the water level doesn’t change noticeably.

Correct Answer: B. The experiment shows that the particles of potassium permanganate are extremely small and can be divided into smaller particles.

Correct 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.

Correct Answer: C. The experiment demonstrates that the particles of ink are continuously moving and get into the spaces between water particles.

Correct Answer: B. Trying to break different materials by hammering, cutting, or stretching suggests that particles of matter have different forces of attraction between them.

Correct Answer: B. Solids have negligible compressibility, meaning they cannot be easily compressed.

Correct Answer: C. Gases from the atmosphere, especially oxygen, diffuse and dissolve in water, allowing aquatic animals to breathe.

Correct Answer: C. Gases have large spaces between their particles, allowing them to be compressed into smaller volumes.

Correct 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.

Correct Answer: B. The melting point is the minimum temperature at which a solid melts to become a liquid at atmospheric pressure.

Correct 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.

Correct Answer: C. Sublimation is the change of state directly from solid to gas without changing into a liquid state.

Correct Answer: A. Increasing pressure can change a gas to liquid or solid by bringing the particles closer together.

Correct Answer: C. Evaporation is the phenomenon of change of liquid into vapor at any temperature below its boiling point.

Correct Answer: C. The volume of the liquid does not affect the rate of evaporation.

Correct Answer: B. The particles of acetone absorb energy from your palm to evaporate, causing your palm to feel cold.

Correct Answer: A. Cotton is a good absorber of water and helps in absorbing sweat, which then evaporates and cools the body.

Correct Answer: C. This process is called condensation.

Correct 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.

Correct Answer: B. Early Greek philosophers believed that matter is made up of tiny indivisible particles, similar to the concept of atoms.

Correct Answer: B. The ink slowly spreads throughout the water due to the movement of ink particles and the spaces between water particles.

Correct 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.

Correct Answer: B. The fact that a gas can be compressed suggests that there are spaces between the particles that can be reduced.

Correct Answer: B. The total volume is slightly less than 100 ml because some of the alcohol particles occupy the spaces between the water particles.

Correct Answer: C. The particles of the incense stick are continuously moving and mix with the air particles due to diffusion.

Correct Answer: B. Increasing the temperature increases the kinetic energy of the particles, making them move faster.

Correct Answer: C. The force of attraction between particles is strongest in solids, which is why they have a fixed shape and volume.

Correct Answer: C. The strong force of attraction between water particles creates surface tension, making it difficult to cut the surface.

Correct Answer: C. Solids have a fixed shape and volume because their particles are tightly packed and have a fixed position.

Correct 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.

Correct 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.

Correct Answer: C. Liquids do not have a definite shape; they take the shape of their container.

Correct Answer: B. Milk is a liquid, and its particles can move around and slide past each other, allowing it to flow and be poured.

Correct Answer: C. The particles of perfume move very fast and spread out in all directions, mixing with air particles and reaching your nose.

Correct Answer: C. Gas particles have large spaces between them, allowing them to be compressed into a smaller volume.

Correct Answer: B. When a gas is compressed, the particles are forced closer together, reducing the spaces between them.

Correct 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.

Correct Answer: A. The heat energy supplied during melting is used to overcome the forces of attraction between the particles, hence the temperature remains constant.

Correct 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.

Correct 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.

Correct Answer: B. Camphor disappears because it undergoes sublimation, changing directly from a solid to a gaseous state without passing through the liquid state.

Correct 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.

Correct Answer: C. Increasing the surface area of the water allows more water molecules to escape from the surface, increasing the rate of evaporation.

Correct 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.

Correct Answer: B. The water sprinkled on the floor absorbs heat from the surroundings and evaporates, taking away the heat and causing a cooling effect.

Correct 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.

Correct 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.

Correct 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.

Correct Answer: B. The sugar particles break down into smaller particles and spread throughout the water, occupying the spaces between the water particles.

Correct Answer: B. The salt particles are small enough to occupy the spaces between the water particles, so the overall volume doesn’t change significantly.

Correct 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.

Correct Answer: B. The sugar particles dissolve and spread throughout the tea, occupying the spaces between the tea particles.

Correct 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.

Correct Answer: B. In hot water, the ink particles have more kinetic energy, which makes them move faster and diffuse more quickly.

Correct Answer: C. The strong force of attraction between the particles in the iron nail makes it difficult to break with bare hands.

Correct 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.

Correct 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.

Correct Answer: C. Liquid particles have weaker forces of attraction compared to solids, allowing them to move around and take the shape of their container.

Correct Answer: C.  The particles in a liquid are closely spaced, leaving less intermolecular space, making it difficult to compress them.

Correct Answer: C. Gas particles have high kinetic energy and negligible forces of attraction, allowing them to move freely and fill the entire space available.

Correct Answer: C. The large intermolecular spaces in gases allow the particles to be brought closer together when compressed.

Correct 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.

Correct 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.

Correct 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.

Correct Answer: C.  The process of a gas changing directly into a solid without passing through the liquid state is called deposition.

Correct 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.

Correct 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.

Correct Answer: A. Nail polish remover has a low boiling point and weak forces of attraction between its particles, allowing it to evaporate quickly.

Correct 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.

Correct 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.

Correct 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.

Correct 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.

Correct Answer: C. Early Indian philosophers classified matter into five basic elements, known as the “Panch Tatva”: air, earth, fire, sky, and water.

Correct 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.

Correct 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.

Correct 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.

Correct 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.

Correct Answer: C. Milk is a liquid, not a solid. Solids have a fixed shape and volume, while liquids take the shape of their container.

Correct 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.

Correct 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.

Correct 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.

Correct Answer: C. Gases have large intermolecular spaces, which allows them to be compressed easily.

Correct Answer: C.  Perfumes work because their particles diffuse quickly in the air, allowing the fragrance to spread and reach us.

Correct Answer: B. At room temperature, which is typically higher than the melting point of ice, the ice absorbs heat energy and changes into water.

Correct Answer: B. The temperature at which a solid changes into a liquid at atmospheric pressure is known as its melting point.

Correct 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.

Correct Answer: B. Applying pressure to a gas forces the particles closer together, reducing the intermolecular spaces and potentially leading to a change of state.

Correct Answer: C. Sublimation is the process where a solid changes directly into a gas without passing through the liquid state.

Correct 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.

Correct 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.

Correct 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.

Correct 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.

Correct 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.

Correct Answer: B. Sunlight is a form of energy, not matter. Matter is anything that has mass and occupies space.

Correct Answer: B. Ancient Greek philosophers believed that matter was composed of tiny indivisible particles called atoms.

Correct 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.

Correct Answer: B. The total volume is slightly less than 100 ml because some of the alcohol particles occupy the spaces between the water particles.

Correct 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.