MCQ: characteristics of Particles of Matter
- What are the tiny units that make up all matter?
Answer: Particles
Explanation: Matter is composed of small, indivisible particles that cannot be seen with the naked eye. This is evident when substances like salt or sugar dissolve in water without increasing its volume.
- What is present between the particles of matter?
Answer: Space
Explanation: Particles of matter have spaces between them, which allow substances to mix, dissolve, and diffuse. For example, when salt is added to water, its particles occupy the spaces between water particles.
- Which property of matter explains the diffusion of perfume in air?
Answer: Motion
Explanation: Particles of matter are in continuous motion. This movement allows gases like perfume to spread throughout a room without stirring.
- What happens to the motion of particles when temperature increases?
Answer: Increases
Explanation: As temperature rises, the kinetic energy of particles increases, making them move faster. This is why hot water dissolves sugar more quickly than cold water.
- What is the process of mixing of particles of different substances called?
Answer: Diffusion
Explanation: The spontaneous intermixing of particles of one substance with another is called diffusion. It is faster in gases due to the higher speed of gas particles.
- What holds the particles of matter together?
Answer: Force
Explanation: There is an attraction between particles of matter, which keeps them together. This force varies for solids, liquids, and gases—being strongest in solids and weakest in gases.
- Which state of matter has the strongest force of attraction between particles?
Answer: Solid
Explanation: In solids, particles are closely packed with strong intermolecular forces, which give solids a definite shape and volume.
- Which state of matter has the weakest force of attraction between particles?
Answer: Gas
Explanation: In gases, particles are far apart and have negligible intermolecular forces, allowing them to move freely and fill any container.
- What happens to the force of attraction when the distance between particles increases?
Answer: Decreases
Explanation: The force of attraction between particles is inversely proportional to the distance between them. In gases, where particles are far apart, the attraction is almost negligible.
- What process demonstrates that particles are too small to be seen?
Answer: Dissolution
Explanation: When substances like potassium permanganate or salt dissolve in water, their particles spread out evenly, proving that they are extremely small and occupy spaces between water molecules.
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