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# NCERT solutions for Class 9 Science chapter 1 - Matter in Our Surroundings

## Chapter 1: Matter in Our Surroundings

#### Chapter 1: Matter in Our Surroundings solutions [Page 3]

Q 1 | Page 3

Which of the following are matter?

Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.

Q 2 | Page 3

Give reasons for the following observation:

The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.

Q 3 | Page 3

A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

Q 4 | Page 3

What are the characteristics of particles of matter?

#### Chapter 1: Matter in Our Surroundings solutions [Page 6]

Q 1 | Page 6

The mass per unit volume of a substance is called density (density = mass/volume). Arrange the following in order of increasing density − air, exhaust from chimney, honey, water, chalk, cotton, and iron.

Q 2.1 | Page 6

Tabulate the differences in the characteristics of states of matter.

Q 2.2 | Page 6

Comment upon the following:- rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy, and density.

Q 3.1 | Page 6

Give reasons:- A gas fills completely the vessel in which it is kept.

Q 3.2 | Page 6

Give reasons:-

A gas exerts pressure on the walls of the container.

Q 3.3 | Page 6

Give reasons:- We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert.

Q 3.4 | Page 6

Give reasons:- A wooden table should be called a solid.

Q 4 | Page 6

Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.

#### Chapter 1: Matter in Our Surroundings solutions [Page 9]

Q 1.1 | Page 9

Convert the following temperature to Celsius scale:- 300 K

Q 1.2 | Page 9

Convert the following temperature to Celsius scale:-573 K

Q 2.1 | Page 9

What is the physical state of water at 250°C.

Q 2.2 | Page 9

What is the physical state of water at 100°C.

Q 3 | Page 9

For any substance, why does the temperature remain constant during the change of state?

Q 4 | Page 9

Suggest a method to liquefy atmospheric gases.

#### Chapter 1: Matter in Our Surroundings solutions [Page 10]

Q 1 | Page 10

Why does a desert cooler cool better on a hot dry day?

Q 2 | Page 10

How does water kept in an earthen pot (matka) become cool during summers?

Q 3 | Page 10

Why does our palm feel cold when we put some acetone or petrol or perfume on it?

Q 4 | Page 10

Why are we able to sip hot tea or milk faster from a saucer than a cup?

Q 5 | Page 10

What type of clothes should we wear in summers?

#### Chapter 1: Matter in Our Surroundings solutions [Page 12]

Q 1.1 | Page 12

Convert the following temperatures to the celsius scale.293 K

Q 1.2 | Page 12

Convert the following temperatures to the celsius scale. 470 K

Q 2.1 | Page 12

Convert the following temperatures to Kelvin scale.25°C

Q 2.2 | Page 12

Convert the following temperatures to Kelvin scale.373°C

Q 3.1 | Page 12

Give reason for the following observation. Naphthalene balls disappear with time without leaving any solid.

Q 3.2 | Page 12

Give reason for the following observation. We can get the smell of perfume sitting several metres away.

Q 4 | Page 12

Arrange the following substances in increasing order of forces of attraction between particles - water, sugar, oxygen.

Q 5.1 | Page 12

What is the physical state of water at 25°C.

Q 5.2 | Page 12

What is the physical state of water at 0°C.

Q 5.3 | Page 12

What is the physical state of water at 100°C.

Q 6.1 | Page 12

Give two reasons to justify water at room temperature is a liquid.

Q 6.2 | Page 12

Give two reasons to justify an iron almirah is a solid at room temperature.

Q 7 | Page 12

Why is ice at 273 K more effective in cooling than water at the same temperature?

Q 8 | Page 12

What produces more severe burns, boiling water or steam?

Q 9 | Page 12

Name A, B, C, D, E and F in the following diagram showing change in its state.

## NCERT solutions for Class 9 Science chapter 1 - Matter in Our Surroundings

NCERT solutions for Class 9 Science chapter 1 (Matter in Our Surroundings) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CBSE Science Textbook for Class 9 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at shaalaa.com are providing such solutions so that students can prepare for written exams. NCERT textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 9 Science chapter 1 Matter in Our Surroundings are How Does Evaporation Cause Cooling, Factors Affecting Evaporation, Effect of Change of Pressure, Effect of Change of Temperature, The Gaseous State, The Liquid State, The Solid State, Characteristics of Particles of Matter, Physical Nature of Matter, Matter in Our Surroundings Introduction.

Using NCERT Class 9 solutions Matter in Our Surroundings exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 9 prefer NCERT Textbook Solutions to score more in exam.

Get the free view of chapter 1 Matter in Our Surroundings Class 9 extra questions for Science and can use shaalaa.com to keep it handy for your exam preparation

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