Chapter 1: Matter in Our Surroundings Application Questions | science Class 9 CBSE

ByteNotes

Chapter 1: Matter in Our Surroundings Application Questions | science Class 9 CBSE | ByteNotes.in

Application Question

Concept in a practical situation

Application

Question 1

Applied Concept

Q1. State five characteristics of particles of matter.

They have space between them.
They are continuously moving.
They attract each other.
They are extremely small.
They intermix on their own (diffusion).

ByteNotes

Application Question

Concept in a practical situation

Application

Question 2

Applied Concept

Q2. What are the differences between solids, liquids, and gases?

Solids have fixed shape and volume; tightly packed particles.
Liquids have fixed volume but no fixed shape; flow easily.
Gases have neither fixed shape nor volume; highly compressible.
Particle movement increases from solid → gas.
Inter-particle forces decrease from solid → gas.

ByteNotes

Application Question

Concept in a practical situation

Application

Question 3

Applied Concept

Q3. Define diffusion. Mention two daily life examples.

Diffusion is the intermixing of particles from two substances.
Occurs due to continuous particle motion.
Example 1: Smell of perfume spreads in room.
Example 2: Ink mixing in water without stirring.
Faster in gases, slower in solids.

ByteNotes

Application Question

Concept in a practical situation

Application

Question 4

Applied Concept

Q4. Explain the concept of evaporation and the factors affecting it.

Evaporation is the escape of liquid surface molecules as vapour.
Occurs below boiling point due to particle motion.
Affected by: surface area, temperature, humidity, wind speed.
Faster in dry and hot conditions.
Results in cooling effect.

ByteNotes

Application Question

Concept in a practical situation

Application

Question 5

Applied Concept

Q5. What is latent heat? Differentiate between latent heat of fusion and vaporisation.

Latent heat is heat required for state change at constant temperature.
Fusion: solid → liquid (e.g., ice melting at 0°C).
Vaporisation: liquid → gas (e.g., water boiling at 100°C).
Vaporisation requires more energy than fusion.
It is absorbed without temperature change.

ByteNotes

Application Question

Concept in a practical situation

Application

Question 6

Applied Concept

Q6. Why do we feel cool when alcohol is applied on the skin?

Alcohol evaporates quickly from skin.
It absorbs heat from skin for vaporisation.
This causes cooling sensation.
Similar effect occurs with acetone or petrol.
Used in fever to cool body quickly.

ByteNotes

Premium Access

Unlock all Application Questions

You are viewing 6 free application questions from this chapter. Upgrade to Premium to unlock the remaining 9 questions.

Upgrade to Premium9 questions locked

Chapter sections

Chapter 1: Matter in Our Surroundings | Application Questions

Q1. State five characteristics of particles of matter.

Q2. What are the differences between solids, liquids, and gases?

Q3. Define diffusion. Mention two daily life examples.

Q4. Explain the concept of evaporation and the factors affecting it.

Q5. What is latent heat? Differentiate between latent heat of fusion and vaporisation.

Q6. Why do we feel cool when alcohol is applied on the skin?

Unlock all Application Questions