NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings Page 3, Page 6, page 9, page 10 and Exercises question answers in English Medium or page 4 ke uttar, page 6 ke uttar, page 9 ke uttar, page 11 ke uttar and abhyaas ke prashn uttar in Hindi Medium updated for new academic session 2022-23.
NCERT Solutions for Class 9 Science Chapter 1
Class 9 Science Chapter 1 Answers in English Medium
9th Science Chapter 1 Answers in Hindi Medium
9th Science Chapter 1 Answers in PDF Format
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| Class: 9 | Science (English and Hindi Medium) |
| Contents: | NCERT Solutions and Important Questions |
| Chapter 1: | Matter in Our Surroundings |
9th Science Chapter 1 Answers in English & Hindi Medium
NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings all the in-text questions as well as chapter end exercises question’s answers are given below. Solutions are available in Hindi and English Medium to study online or download in PDF form free.
Class 9 Science Chapter 1 Solutions Related Pages
Class 9 Science Chapter 1 Extra Questions
Why do substance undergo change in physical state?
Substance undergo change in physical state because both inter-particle spaces and inter-particle forces can be changed by changing the condition of temperature and pressure.
When sugar is dissolved in water, there is hardly an increase in volume. Which characteristic of matter is illustrated by this observation?
This is because of the presence of inter particle space or empty spaces. Particles or molecules of water can fill the empty space in the particles or molecules of sugar and vice versa. That is why there is hardly any change in the volume as a result of dissolution of sugar in water.
Define gaseous state of a substance.
A substance is said to be in the gaseous state if under normal pressure, its boiling point is below the room temperature.
How does pressure help in the liquefication of a gas?
Increase in pressure helps in the liquefication of a gas. The particles or molecules of a gas come closer and closer as the pressure is being increased gradually. They ultimately condense and as a result, the gas liquefies or changes into the liquid state.
Solids are generally very heavy while gases are light. Explain.
In the solids, the particle are very closely packed. As a result, the number of particles per unit volume is quite large. Therefore, the solids are normally quite heavy. In the gases, the particles are loosely packed. The number of particle per unit volume is completely small. Therefore, gases are light.
Questions for Practice on 9th Science Chapter 1
Question 1:
Solids are normally not compressible. Why can a sponge be readily pressed?
Answer 1:
A sponge made up of rubber has a large number of fine pores in which air remains filled. When the sponge is pressed, the air from the pores escapes and vacant space are left. Therefore, the sponge can be readily pressed on applying pressure.
Question 2:
Why do we sweat on a humid day?
Answer 2:
In humid day, the air around us has already high percentage of water vapours. Therefore, the water coming from the skin gets less opportunity to charge into vapours and remains sticking to our body. We therefore, swear more on a humidity day.
Question 3:
Kelvin scale of temperature is regarded as better than the Celsius scale. Give reason.
Answer 3:
In the Celsius scale of temperature we often come across a negative sign for the temperature (e.g., -8.5⁰C). Since the sign is always positive in the Kelvin scale, it is regarded as better.
Important Questions on 9th Science Chapter 1
Naphthalene balls disappear with time without leaving any solid. Why?
Naphthalene shows the property of sublimation. Evaporation of naphthalene takes place easily and so it disappears during course of time without leaving a solid.
We can get the smell of perfume sitting several meters away. Why?
Perfumes vaporize very fast and its vapours diffuse into air easily. That is why we can smell perfume sitting several meters away.
Water at room temperature is a liquid. Give reason.
Water at room temperature is a liquid because it has fluidity and has definite volume but no definite shape.
An iron almirah is a solid at room temperature. Give reason.
An iron almirah is a solid at room temperature because it is rigid and has a definite shape.
Why is ice at 273 K more effective in cooling than water at the same temperature?
Ice at 273 K is less energetic than water. It is because of the difference in the latent heat of fusion which is present in water at the same temperature in the form of extra energy.
What produces more severe burns, boiling water or steam?
Steam produces more severe burns than boiling water. This is because steam has more energy than boiling water, present in it in the form of latent heat of vaporization.
