States of Matter: Liquid MCQs Quiz | Class 9
This quiz covers Class IX Science (Code 086), Unit I: Matter – Its Nature and Behaviour. The questions focus on the properties of the liquid state, including fixed volume, lack of fixed shape, fluidity, and comparative density. Test your understanding of these concepts, check your score immediately, and download the detailed answer PDF for revision.
Understanding the Liquid State
Matter around us exists in three primary states: solid, liquid, and gas. The liquid state is an intermediate phase between solids and gases. Unlike solids, particles in a liquid have more freedom of movement, allowing the substance to flow and change shape. Unlike gases, however, the particles are still close enough to maintain a definite volume.
Key Characteristics of Liquids
- No Fixed Shape: Liquids do not have a rigid structure. They take the shape of the container they are placed in. This is because the intermolecular forces are not strong enough to hold particles in fixed positions.
- Fixed Volume: Despite changing shape, the volume of a given amount of liquid remains constant at a given temperature. The particles cannot move far apart from each other.
- Fluidity: Liquids have the ability to flow. This property allows them to be transported easily through pipes and channels.
- Compressibility: Liquids are almost incompressible. While they are more compressible than solids, the difference is negligible for most practical purposes compared to gases.
- Density: Generally, liquids have a lower density than solids (with exceptions like water/ice) but a much higher density than gases.
- Diffusion: Liquids can diffuse into other liquids. The rate of diffusion is higher than in solids because liquid particles move more freely.
Comparison of Particle Arrangement
| Property | Solid | Liquid | Gas |
|---|---|---|---|
| Particle Packing | Tightly packed | Loosely packed | Very loosely packed |
| Intermolecular Force | Very Strong | Intermediate | Negligible |
| Kinetic Energy | Low | Moderate | High |
| Shape | Fixed | Takes container shape | No fixed shape |
Quick Revision Notes
- Liquids possess fluidity, meaning they are not rigid.
- The attraction between particles is strong enough to keep the volume fixed but weak enough to allow flow.
- Diffusion in liquids increases with temperature due to increased kinetic energy.
- Aquatic animals breathe oxygen dissolved in water, demonstrating the diffusion of gases into liquids.
Extra Practice Questions
1. Why does water flow faster than honey? (Hint: Viscosity and particle attraction)
2. Explain why the density of ice is less than that of liquid water.
3. How does temperature affect the evaporation rate of a liquid?
4. Can gases diffuse into liquids? Give an example.
5. Why are liquids used in hydraulic breaks? (Hint: Incompressibility)
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