Topic outline

  • Chapter 1 - Matter in Our Surroundings – 8

    • Matter in Our Surroundings - Questions Page

      Matter in Our Surroundings

      Q92. State any two characteristic properties of a solid.

      Or
      What are the main characteristics of a solid?
      Or
      What are the characteristics of solids?

      Ans. Characteristics of solids

      a. Solids have a definite shape, distinct boundaries and fixed volumes, that is, have negligible compressibility.

      b. Solids have a tendency to maintain their shape when subjected to outside force.

      c. Solids may break under force but it is difficult to change their shape, so they are rigid.

       

      Q93. Draw a labelled diagram to show interconversion of the three states of matter.

      Ans. 


      Image from NCERT

       

      Q94. Draw a labeled diagram of the experimental set-up to study the latent heat of fusion of ice.

      Ans. 


      Image from NCERT

       

      Q95. Draw a labeled diagram of the experimental set-up to study the latent heat of vaporization of water.

      Ans. 


      Image from NCERT

       

      Q96. Draw a labeled diagram of the experimental set-up to demonstrate the sublimation of ammonium chloride.

      Ans. 


      Image from NCERT

       

      Q97. Complete the table.

      Quantity

      Unit

      Symbol

      Temperature

      kelvin

      K

      Length

      metre

      m

      Mass

      kilogram

      kg

      Weight

      newton

      N

      Volume

      cubic metre

      m3

      Density

      kilogram per cubic metre

      kg m–3

      Pressure

      pascal

      Pa

       

      Q98. Give reason for the following observations.
      (a) Naphthalene balls disappear with time without leaving any solid.
      (b) We can get the smell of perfume sitting several metres away.

      Ans. (a) Naphthalene balls disappear with time without leaving any solid because naphthalene balls undergo sublimation i.e. change of state directly from solid to gas without changing into liquid state (or vice versa). Naphthalene balls keep on forming naphthalene vapours slowly which disappear into the air.

      (b) We can get the smell of perfume sitting several metres away due to diffusion of perfume vapours into air. The liquid perfume quickly changes into vapours. The perfume vapours move very rapidly in all directions in air, mix with the air particles and hence spread with air easily. 

       

      Q99. Name A,B,C,D,E and F in the following diagram showing change in its state?


      Image from NCERT

      Ans. A – Melting or Fusion

             B - Vaporisation 

             C - Condensation 

             D - Solidification 

             E - Sublimation 

             F - Sublimation

       

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