MCQ: State of matter
- How many states of matter are commonly observed?
Answer: Three
Explanation: Matter exists in three primary states: solid, liquid, and gas. These states arise due to differences in the arrangement, movement, and attraction of particles.
- Which state of matter has a definite shape and volume?
Answer: Solid
Explanation: In solids, particles are tightly packed and have strong intermolecular forces, which gives them a definite shape and volume.
- Which state of matter takes the shape of its container but has a fixed volume?
Answer: Liquid
Explanation: Liquids have loosely arranged particles that can move around, allowing them to take the shape of the container while maintaining a fixed volume.
- Which state of matter completely fills the container it is placed in?
Answer: Gas
Explanation: Gas particles move freely and have negligible intermolecular forces, allowing them to expand and occupy the entire volume of the container.
- What is the term for the process of changing a solid to a liquid?
Answer: Melting
Explanation: When a solid is heated, its particles gain energy, weakening intermolecular forces and allowing it to change into a liquid at its melting point.
- What is the term for the process of changing a liquid to a gas?
Answer: Evaporation
Explanation: In this process, particles at the surface of a liquid gain enough energy to break free and become gas, even below the boiling point.
- Which process changes a gas into a liquid?
Answer: Condensation
Explanation: When a gas loses energy, its particles slow down and come closer together to form a liquid.
- What is the direct conversion of solid to gas called?
Answer: Sublimation
Explanation: Certain substances like camphor and dry ice (solid CO₂) change directly from solid to gas without passing through the liquid phase.
- Which state of matter has the highest kinetic energy?
Answer: Gas
Explanation: Gas particles move at high speeds due to negligible intermolecular forces and greater kinetic energy compared to solids and liquids.
- What is the term for a gas turning directly into a solid?
Answer: Deposition
Explanation: The opposite of sublimation, deposition occurs when gas particles lose energy and directly form a solid without becoming a liquid.
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