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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

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