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Questions and Answers

What is the main focus of the document?

  • Mathematics curriculum for Class IX
  • History curriculum for Class IX
  • Literature curriculum for Class IX
  • Science curriculum for Class IX (correct)

What year was the first edition of the textbook published?

  • February 2005
  • February 2007
  • February 2006 (correct)
  • February 2008

Which of the following statements is true regarding the publication rights?

  • It can be lent by way of trade.
  • It can be reproduced without any consent.
  • It can be sold or resold freely.
  • It cannot be reproduced without the publisher’s permission. (correct)

What is the significance of the price printed on the page?

<p>It is the correct price of the publication. (C)</p> Signup and view all the answers

What restrictions apply to the selling of this textbook?

<p>It cannot be sold in any form other than published. (A)</p> Signup and view all the answers

What three states of matter are commonly recognized?

<p>Solid, Liquid, Gas (A)</p> Signup and view all the answers

What characteristic does not apply to solids?

<p>Easily compressible (B)</p> Signup and view all the answers

Which of the following is an example of a liquid?

<p>Water (B)</p> Signup and view all the answers

When excessive force is applied to solid matter, what is a likely outcome?

<p>It breaks (D)</p> Signup and view all the answers

What is the main reason that solids maintain a fixed shape?

<p>Strong intermolecular forces (D)</p> Signup and view all the answers

What happens to the volume of a liquid when it is transferred between containers?

<p>It remains the same (D)</p> Signup and view all the answers

Which property is generally not associated with gases?

<p>Definite volume (D)</p> Signup and view all the answers

What occurs when a sponge is pressed and air is expelled?

<p>The sponge compresses (A)</p> Signup and view all the answers

What effect does the latent heat of vaporization of water have on a hot surface?

<p>It cools the surface. (B)</p> Signup and view all the answers

Why do we feel cool when perspiration evaporates from our skin?

<p>Evaporation absorbs heat from the body. (B)</p> Signup and view all the answers

How does cotton help keep us cool during summer?

<p>It absorbs and facilitates evaporation of sweat. (C)</p> Signup and view all the answers

Why does a desert cooler work effectively on a hot dry day?

<p>It adds humidity to the air. (B)</p> Signup and view all the answers

What happens to water when it is kept in an earthen pot during summer?

<p>It cools down due to evaporation from the pot. (D)</p> Signup and view all the answers

What sensation do we feel when we apply acetone to our palm?

<p>The palm becomes cold due to heat absorbed during vaporization. (A)</p> Signup and view all the answers

Why is it easier to sip hot tea or milk from a saucer rather than from a cup?

<p>The saucer has a larger surface area for evaporation. (D)</p> Signup and view all the answers

What type of clothing is recommended for hot weather?

<p>Lightweight cotton fabrics. (D)</p> Signup and view all the answers

What is the term used for the direct transformation of a solid to a gas without becoming a liquid?

<p>Sublimation (B)</p> Signup and view all the answers

How is solid carbon dioxide commonly known due to its sublimation properties?

<p>Dry ice (A)</p> Signup and view all the answers

What phenomenon occurs when gas converts directly into solid without becoming liquid?

<p>Deposition (A)</p> Signup and view all the answers

What determines the state of a substance as solid, liquid, or gas?

<p>Temperature and pressure (A)</p> Signup and view all the answers

What unit is commonly used to measure atmospheric pressure at sea level?

<p>Atmosphere (atm) (A)</p> Signup and view all the answers

When a gas is compressed by increasing pressure, what generally happens to the particles?

<p>They move closer together (D)</p> Signup and view all the answers

What is the pressure measured at sea level commonly referred to as?

<p>Normal atmospheric pressure (D)</p> Signup and view all the answers

What is the relationship between the distance of constituent particles and the state of matter?

<p>Closer particles lead to solid states, while gases have particles farther apart (A)</p> Signup and view all the answers

What occurs to the kinetic energy of particles when the temperature of a solid increases?

<p>It increases, causing particles to vibrate faster. (C)</p> Signup and view all the answers

What is the boiling point of water at atmospheric pressure?

<p>373 K (D)</p> Signup and view all the answers

What does the melting point of a solid indicate?

<p>The strength of attraction between its particles. (B)</p> Signup and view all the answers

At 373 K, how does the energy of water vapor compare to that of liquid water?

<p>Water vapor has more energy than liquid water. (C)</p> Signup and view all the answers

What is the latent heat of vaporization?

<p>The energy absorbed by a liquid to convert into gas. (A)</p> Signup and view all the answers

When do particles in a liquid gain enough energy to change into a gas?

<p>When the temperature is raised to the boiling point. (B)</p> Signup and view all the answers

What happens at the melting point of ice?

<p>Ice starts melting and becomes liquid water. (A)</p> Signup and view all the answers

What is the melting point of ice in Kelvin?

<p>273 K (D)</p> Signup and view all the answers

What is the primary reason for rationalising the content in textbooks as mentioned?

<p>To align with the National Education Policy's emphasis on experiential learning (B)</p> Signup and view all the answers

Which of the following is NOT one of the considerations for rationalising the content of textbooks?

<p>Relevance in current educational standards (B)</p> Signup and view all the answers

What aspect of education does the NCERT aim to promote through the rationalisation of textbooks?

<p>Experiential learning and creativity (D)</p> Signup and view all the answers

Who played a significant role in overseeing the contributions to the textbook development?

<p>Professor Mrinal Miri and Professor G.P. Deshpande (D)</p> Signup and view all the answers

Which of the following factors is considered when evaluating content for rationalisation?

<p>Access to content through self-learning (A)</p> Signup and view all the answers

What is the purpose of reducing the content load on students during the COVID-19 pandemic?

<p>To alleviate stress and improve learning outcomes (A)</p> Signup and view all the answers

What does the NCERT particularly thank in relation to the development of the textbook?

<p>Teachers and their principals (C)</p> Signup and view all the answers

How does the NCERT ensure continuous improvement in the quality of its products?

<p>By collecting comments and suggestions for revisions (A)</p> Signup and view all the answers

Flashcards

Textbook Edition

The version of a textbook, such as the first edition or a reprint.

Copyright

Legal right granted to the creator of a work, preventing unauthorized copying or distribution.

Reproduction Rights

Permission required to copy or distribute a work.

Publisher's Consent

Formal permission granted by the publishing company to reproduce or distribute a work.

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Class IX Science Textbook

A science textbook for students in ninth grade.

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ISBN

International Standard Book Number—a unique identification number for books.

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Reprint

A new printing of an existing book, usually with minor or no changes.

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Correct Price

The officially listed, legitimate price of a product.

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Textbook Rationalization

Reducing content in textbooks to focus on essential learning.

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National Education Policy 2020 (NEP 2020)

A policy that advocates for reducing content load and promoting experiential learning.

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COVID-19 Pandemic

Global health crisis that prompted the need for curriculum adjustments.

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Learning Outcomes

Specific skills or knowledge students should gain from a unit of study.

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Overlapping Content

Similar information covered in different subjects, reducing redundancy.

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Difficulty Level

Assessment of how challenging content is for students.

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Self-Learning

Students learning independently without direct teacher intervention.

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Peer-Learning

Students learning from each other.

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Solid State

A state of matter with a definite shape and volume.

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Liquid State

A state of matter with a definite volume, but no definite shape.

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Gas State

A state of matter that has neither a definite shape nor a definite volume.

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Shape of Solids

Solids maintain their own shape; they do not change shape easily.

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Volume of Solids

Solids have a fixed volume; their size does not change easily.

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Shape of Liquids

Liquids take the shape of the container they are in.

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Volume of Liquids

Liquids have a fixed volume.

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Matter's States

Matter exists in three main states: solid, liquid, and gas.

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Sublimation

A change of state directly from solid to gas without becoming a liquid.

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Deposition

A change of state directly from gas to solid without becoming a liquid.

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Dry Ice

Solid carbon dioxide that sublimates directly to a gas.

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Pressure

A force applied over an area.

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Temperature

A measure of how hot or cold something is.

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State of Matter

Describes if matter is a solid, liquid, or gas.

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Atmosphere

A unit of measuring pressure exerted by a gas, roughly equivalent to the pressure of the Earth's atmosphere at sea level.

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Effect of pressure on matter

Changes in pressure can cause changes in the state of matter.

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Boiling Point

The temperature at which a liquid changes to a gas at a specific pressure.

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Melting Point

The temperature at which a solid changes to a liquid at a specific pressure.

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Latent Heat of Vaporization

The heat energy required to change a liquid to a gas without changing its temperature.

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Kinetic Energy of Particles

The energy of particles due to their motion.

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Boiling

A bulk phenomenon of a liquid transitioning to a gas, requiring enough energy for particles to break free from attraction forces.

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Melting

The physical process by which a solid transforms into a liquid.

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373K

The temperature at which water boils at standard atmospheric pressure (100°C).

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273K

The temperature at which water (ice) melts at standard atmospheric pressure (0°C).

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Thermal Energy

The total kinetic energy of all the particles in a substance; a source for the energy needed to change phases.

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Water's Cooling Effect

Water absorbs heat during evaporation, cooling the surroundings.

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Latent Heat of Vaporization

Heat absorbed by a liquid during evaporation, but not changing its temperature.

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Evaporation and Cooling

The process where a liquid changes to a gas, taking heat from the surroundings and causing cooling.

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Cotton Clothing in Summer

Cotton absorbs sweat, allowing it to evaporate easily, keeping the body cool.

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Three States of Matter

Matter exists as solids, liquids, and gases.

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Forces Between Particles (Solids)

Strongest forces of attraction between particles in solids.

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Forces Between Particles (Liquids)

Intermediate forces of attraction between particles in liquids.

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Forces Between Particles (Gases)

Weakest forces of attraction between particles in gases.

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Particle Spacing (Solids)

Particles in solids are closely packed together.

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Particle Spacing (Liquids)

Particles in liquids are further apart than in solids.

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Particle Spacing (Gases)

Particles in gases are widely spaced.

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Kinetic Energy (Solids)

Particles in solids have minimum kinetic energy.

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Kinetic Energy (Liquids)

Particles in liquids have more kinetic energy than in solids.

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Kinetic Energy (Gases)

Particles in gases have maximum kinetic energy.

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