NCERT Science · Class IX · Chapter 1

Matter in Our
Surroundings

States, Properties & Phase Transitions

50 MCQs 24 PYQs 8 Topics 75 sec/Q

MCQ Bank Snapshot

50
Total MCQs
24
PYQs Included
8
Topic Areas
Difficulty Split
Easy18
Medium22
Hard10

Avg Time: 75 sec/Q  |  Total Time: ~63 min

Why Practise These MCQs?
CBSE NTSE Olympiad State Boards

Matter in Our Surroundings forms the Chemical foundation of Class IX. Changes of state, latent heat and diffusion are guaranteed CBSE MCQ territory every year. NTSE probes particle-theory reasoning at a conceptual level, and Olympiads extend into pressure-dependent boiling points.

Topic-wise MCQ Breakdown

Characteristics of Matter7 Q
States of Matter — Properties10 Q
Interconversion of States8 Q
Evaporation & Factors Affecting It7 Q
Latent Heat (Fusion & Vaporisation)9 Q
Diffusion & Osmosis5 Q
Effect of Pressure on States4 Q

Must-Know Formulae Before You Start

  • Density = Mass / Volume  (SI unit: kg/m³)
  • Temperature conversion: K = °C + 273
  • Boiling point of water = 373 K at 1 atm pressure
  • Melting point of ice = 273 K (0 °C) at 1 atm
  • Latent Heat of Fusion of water = 3.34 × 10⁵ J/kg
  • Latent Heat of Vaporisation of water = 22.6 × 10⁵ J/kg
  • Evaporation ∝ Surface area, Temperature; ∝ 1/Humidity

MCQ Solving Strategy

01
Identify the State First

Determine solid, liquid or gas before selecting any property or change-of-state option.

02
Track Energy Direction

Heating → KE↑ → particles move apart. Cooling reverses this. Map every process to an energy direction.

03
Use SI Units (K, not °C)

Convert °C → K for particle-energy MCQs. Eliminate any option whose unit doesn't match the question context.

04
Latent Heat = Flat Temperature

During any change of state, temperature stays constant — all energy goes into overcoming intermolecular forces.

Common Traps & Errors

  • Plasma and Bose–Einstein condensate are the 4th and 5th states — rarely tested at Class IX but watch for trap options in elimination questions.
  • Sublimation ≠ Evaporation. Sublimation = solid → gas directly (dry ice, camphor, iodine, naphthalene). Evaporation = liquid → gas at the surface.
  • During boiling, temperature stays constant — latent heat is absorbed, NOT used to raise temperature.
  • Evaporation is a surface phenomenon; boiling occurs throughout the bulk of the liquid.
  • Diffusion rate: gases > liquids > solids — inversely proportional to particle density and directly to temperature.
  • Increasing atmospheric pressure raises the boiling point of a liquid — pressure cookers use this principle.

Difficulty Ladder

① Easy
Definitions & states
② Medium
Phase changes
③ Hard
Latent heat & diffusion
★ PYQ
CBSE / NTSE

Work through each rung in order — do not jump to Hard before mastering Easy.

Continue Your Preparation

📖Chapter Notes 🧠MCQ Practice 📘NCERT Solutions ✔️True / False ➡Next Chapter
🎯 Knowledge Check

Chemistry — Matter In Our Surroundings

50 Questions Class 9 MCQs
1
Which of the following is NOT a characteristic of particles of matter?
2
The smell of perfume spreads in a room due to:
3
The process of mixing of particles of two different types of matter on their own is called:
4
Matter is made up of:
5
Which of the following shows diffusion most quickly?
6
Which of the following has a definite shape and volume?
7
Liquids have:
8
Gases have:
9
Which of the following is most compressible?
10
The force of attraction is maximum in:
11
Conversion of solid into liquid is called:
12
The fixed temperature at which a solid changes into liquid is called:
13
At 1 atm pressure, ice melts at:
14
The temperature at which liquid changes to vapour at atmospheric pressure is called:
15
The SI unit of temperature is:
16
Solid CO? is called:
17
Conversion of gas to liquid is called:
18
The process in which a solid directly changes into vapour is called:
19
The amount of heat required to change 1 kg of solid into liquid at its melting point is called:
20
Latent heat of vaporisation of water is:
21
The process of conversion of liquid into vapour below its boiling point is called:
22
Evaporation increases with:
23
The cooling caused by evaporation is due to:
24
On increasing humidity, the rate of evaporation:
25
Why does a desert cooler cool better on a hot dry day?
26
Why do we feel cool when water evaporates from our body?
27
Wet clothes dry faster in:
28
Which of the following factors does NOT affect evaporation?
29
The phenomenon of cooling by evaporation is employed in:
30
Why do we perspire more in summer?
31
Camphor disappears when kept in open air due to:
32
Which state of matter has minimum compressibility?
33
Which state of matter can be easily compressed?
34
At high altitude, water boils at:
35
Which of the following is an example of condensation?
36
Which phenomenon is responsible for water droplets on outer surface of a glass filled with ice water?
37
The SI unit of pressure is:
38
Which of the following shows both evaporation and diffusion?
39
What happens to particles of matter when heat is supplied?
40
The boiling point of water at sea level is:
41
Why do liquids flow?
42
Which is not a state of matter studied in Class 9 NCERT?
43
Drying of wet hair in sunlight is due to:
44
Which gas is known as "dry ice" when solidified?
45
Why do we see fog in winters?
46
Interconversion of states of matter can be achieved by:
47
What happens to the boiling point of water if pressure is increased?
48
Which of the following is not a pure substance?
49
Clouds are formed due to:
50
Which property of matter explains why a gas fills the entire container?
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Matter In Our Surroundings | Science Class 9 | Academia Aeternum — Complete Notes & Solutions · academia-aeternum.com
Prepare effectively for your Class 9 Science exams with these 50 multiple choice questions (MCQs) based on the NCERT Chapter “Matter in Our Surroundings”. These questions cover all important topics such as characteristics of matter, states of matter, change of state (melting, boiling, condensation, sublimation), evaporation, cooling effect of evaporation, and real-life applications. Each question comes with four options, correct answer, and detailed explanation to help students strengthen…
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    ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
    Sharing this chapter
    Matter In Our Surroundings | Science Class 9 | Academia Aeternum
    Matter In Our Surroundings | Science Class 9 | Academia Aeternum — Complete Notes & Solutions · academia-aeternum.com
    Prepare effectively for your Class 9 Science exams with these 50 multiple choice questions (MCQs) based on the NCERT Chapter “Matter in Our Surroundings”. These questions cover all important topics such as characteristics of matter, states of matter, change of state (melting, boiling, condensation, sublimation), evaporation, cooling effect of evaporation, and real-life applications. Each question comes with four options, correct answer, and detailed explanation to help students strengthen…
    🎓 Class 9 📐 Science 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
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