Matter In Our Surroundings - Very Short Answers Test

Q1. What is matter?
Matter refers to anything that occupies space and has mass. It can exist in three states - solid, liquid, or gas.

Q2. What is the basic unit of matter?
The basic unit of matter is an atom. Atoms combine to form molecules, which in turn form different types of matter.

Q3. What is the difference between solid, liquid, and gas?
- Solid: In a solid state, particles are closely packed and have a fixed shape and volume.
- Liquid: In a liquid state, particles are loosely packed and have a definite volume but no fixed shape.
- Gas: In a gas state, particles are widely spaced and have neither a definite shape nor volume.

Q4. What is the melting point?
The melting point of a substance is the temperature at which it changes from a solid to a liquid state. It is a characteristic property of each substance.

Q5. What is the boiling point?
The boiling point of a substance is the temperature at which it changes from a liquid to a gas state. Like the melting point, it is also a characteristic property of each substance.

Q6. What is evaporation?
Evaporation is the process in which a liquid changes into a gas state at a temperature below its boiling point. It occurs from the surface of the liquid.

Q7. What is condensation?
Condensation is the process in which a gas changes into a liquid state. It occurs when the temperature of the gas decreases.

Q8. What is sublimation?
Sublimation is the process in which a solid directly changes into a gas without passing through the liquid state. Examples include dry ice (solid carbon dioxide) and camphor.

Q9. What is diffusion?
Diffusion is the process in which particles of a substance move from an area of higher concentration to an area of lower concentration. It leads to the mixing of substances.

Q10. What is the effect of pressure on the boiling point?
An increase in pressure raises the boiling point of a substance, while a decrease in pressure lowers it. This is why cooking at high altitudes requires longer boiling times.

Q11. What is the effect of temperature on diffusion?
An increase in temperature increases the rate of diffusion as it provides more energy to the particles, allowing them to move faster.

Q12. What is the effect of temperature on evaporation?
An increase in temperature increases the rate of evaporation as it provides more energy to the liquid particles, making them escape from the surface faster.

Q13. What is the effect of surface area on evaporation?
An increase in surface area increases the rate of evaporation as it provides more space for the liquid particles to escape from the surface.

Q14. What is the effect of humidity on evaporation?
High humidity reduces the rate of evaporation as the air is already saturated with water vapor, making it harder for more liquid particles to escape into the air.

Q15. What is the effect of temperature on condensation?
A decrease in temperature increases the rate of condensation as it reduces the energy of

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