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Political Science NCERT Solutions Class 9 Science Chapter 1 – Matter in Our Surroundings
Class 9 Science
Last Updated: 15 April 2026
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हिंदी में (Hindi)
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Important Points
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Practice MCQ Questions (28 questions)
Q1. What is matter made up of?
✓ Correct Answer: A
Q2. What happens to the particles of a substance when it is heated?
✓ Correct Answer: B
Q3. What is the process of solid changing into liquid called?
✓ Correct Answer: B
Q4. Which state of matter has a definite shape and volume?
✓ Correct Answer: A
Q5. What is the minimum temperature at which a solid melts called?
✓ Correct Answer: B
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Frequently Asked Questions (FAQ)
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Tough Words (Glossary)
Matter
Meaning: Substance that has mass and occupies space
अर्थ: पदार्थ
"Everything around us is made up of matter."
Volume
Meaning: Amount of space occupied by an object
अर्थ: आयतन
"The volume of water in the glass is 200 ml."
Mass
Meaning: The quantity of matter in a body
अर्थ: द्रव्यमान
"The mass of the stone is 5 kg."
Particles
Meaning: Small units that make up matter
अर्थ: कण
"Matter is made up of tiny particles."
Philosophers
Meaning: Thinkers who study ideas about existence and knowledge
अर्थ: दार्शनिक
"Ancient philosophers studied matter deeply."
Classification
Meaning: The action of arranging into groups
अर्थ: वर्गीकरण
"Matter can be classified into solids, liquids, and gases."
Continuous
Meaning: Without any break or gap
अर्थ: सतत
"Some believed matter is continuous like wood."
Kinetic Energy
Meaning: Energy possessed by a moving object
अर्थ: गतिज ऊर्जा
"Particles of matter always possess kinetic energy."
Diffusion
Meaning: Mixing of particles of two substances on their own
अर्थ: प्रसरण
"The smell of perfume spreads by diffusion."
Attraction
Meaning: Force pulling particles together
अर्थ: आकर्षण
"Particles of matter attract each other."
Compressibility
Meaning: Ability to be pressed into a smaller volume
अर्थ: संकुचनशीलता
"Gases have high compressibility."
Rigid
Meaning: Unable to change shape easily
अर्थ: कठोर
"Solids are rigid in nature."
Fluid
Meaning: A substance that can flow
अर्थ: द्रव
"Liquids are called fluid as they flow."
Aquatic
Meaning: Living in water
अर्थ: जलीय
"Aquatic animals breathe oxygen dissolved in water."
Compressible
Meaning: Capable of being compressed
अर्थ: संकुचन योग्य
"Gases are highly compressible."
Random
Meaning: Happening without order
अर्थ: अनियमित
"Gas particles move in random directions."
Pressure
Meaning: Force per unit area
अर्थ: दबाव
"The balloon burst due to high pressure."
Melting Point
Meaning: The temperature at which a solid changes into liquid
अर्थ: गलनांक
"The melting point of ice is 0°C."
Fusion
Meaning: Process of melting
अर्थ: गलन प्रक्रिया
"Fusion is the change of solid into liquid."
Latent Heat
Meaning: Hidden heat energy absorbed during change of state
अर्थ: गुप्त ऊष्मा
"Ice absorbs latent heat while melting."
Vaporisation
Meaning: Change of liquid into vapour
अर्थ: वाष्पीकरण
"Boiling is a process of vaporisation."
Boiling Point
Meaning: Temperature at which liquid boils
अर्थ: स्फुटनांक
"The boiling point of water is 100°C."
Sublimation
Meaning: Direct change from solid to gas
अर्थ: उर्ध्वपातन
"Camphor shows sublimation."
Deposition
Meaning: Change from gas to solid directly
अर्थ: अवक्षेपण
"Frost forms by deposition of water vapour."
Evaporation
Meaning: Change of liquid into vapour at any temperature
अर्थ: वाष्पन
"Wet clothes dry due to evaporation."
Surface Area
Meaning: The total area of the surface of an object
अर्थ: सतही क्षेत्रफल
"More surface area increases evaporation."
Humidity
Meaning: Amount of water vapour in air
अर्थ: आर्द्रता
"High humidity reduces evaporation."
Wind Speed
Meaning: How fast the wind is moving
अर्थ: हवा की गति
"Clothes dry faster at high wind speed."
Condensation
Meaning: Change of vapour into liquid
अर्थ: संघनन
"Water droplets form by condensation."
Matter States
Meaning: Solid, liquid, and gas forms of matter
अर्थ: पदार्थ की अवस्थाएँ
"Water exists in three states of matter."
Intermixing
Meaning: Mixing of different substances
अर्थ: मिश्रण
"Sugar intermixes with water."
Phenomenon
Meaning: A fact or event observed
अर्थ: प्रकटन
"Evaporation is a natural phenomenon."
Absorption
Meaning: Taking in of energy or liquid
अर्थ: अवशोषण
"The sponge shows absorption of water."
Exert
Meaning: To apply force
अर्थ: प्रयोग करना
"Gases exert pressure on container walls."
Liquefy
Meaning: To change gas into liquid
अर्थ: द्रवीभूत करना
"High pressure can liquefy gases."
Cylinder
Meaning: A container for gases or liquids
अर्थ: सिलेंडर
"Oxygen is stored in a cylinder."
Bulk Phenomenon
Meaning: A process involving whole mass
अर्थ: सामूहिक प्रकटन
"Boiling is a bulk phenomenon."
Nostril
Meaning: One of the two external openings of the nose
अर्थ: नथुना
"The smell enters through the nostrils."
Compress
Meaning: To press into smaller volume
अर्थ: दबाना
"Air can be compressed easily."
Hidden Heat
Meaning: Heat not visible during state change
अर्थ: गुप्त ऊष्मा
"Latent heat is also called hidden heat."
Atmospheric Pressure
Meaning: Pressure exerted by air around us
अर्थ: वायुमंडलीय दबाव
"Boiling point depends on atmospheric pressure."
Transition
Meaning: Change from one state to another
अर्थ: परिवर्तन
"Melting is a transition from solid to liquid."
Vapour
Meaning: Gaseous form of liquid
अर्थ: वाष्प
"Steam is the vapour of water."
Permeate
Meaning: To spread through something
अर्थ: व्याप्त होना
"The smell permeated the room."
Refrigeration
Meaning: Cooling by removing heat
अर्थ: शीतलन
"Refrigeration preserves food."
Absorb
Meaning: To take in energy or liquid
अर्थ: सोखना
"Plants absorb water through roots."
Dissolve
Meaning: To mix completely in liquid
अर्थ: घुलना
"Sugar dissolves in water."
Aquatic Plants
Meaning: Plants living in water
अर्थ: जलीय पौधे
"Lotus is an aquatic plant."
Energy
Meaning: Capacity to do work
अर्थ: ऊर्जा
"We need energy to move and work."
Temperature
Meaning: Measure of heat
अर्थ: तापमान
"Water boils at 100°C temperature."