Class -IX. Assignment MATTER IN OUR …

Class -IX. Assignment MATTER IN OUR SURROUNDINGS 1. Fill in the blanks. (1) Anything that occupies space and has mass is ...... (ii) Matter exists in three states.............,.............. and ....... (iii) The mass per unit volume of a substance is called ............ (iv) The temperature at which a solid melts to become a liquid is called its ............ (V) The temperature at which a liquid starts boiling at the atmospheric pressure is known as its.................... (vi) When ice melts, there is a................in volume. (vii) Increase in pressure,..........the boiling point of water. (viii) The phenomenon of change of a liquid into gas at any temperature below its boiling point is called ............. (ix) The intermixing of particles of two substances on their own is called .......... (x) The sun and the stars glow because of the presence of .... ... in them. 2. Mark the statements true or false (i) Evaporation causes cooling. (ii) Boiling is a surface phenomenon. (iii) Evaporation is a bulk phenomenon. (iv) The unit of pressure is Pascal (Pa). (V) The melting point of ice is 373 K. (vi) Liquids have a fixed volume but they have no fixed shape. (vii) Gases do not flow. (viii) The spaces between the molecules are the minimum in solids. (ix) The forces of attraction between the molecules are negligible in solids. (x) The movement of molecules is the minimum in solids.

Prepare a brief write up in concept of chapter 14 natural resources

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𝑾𝒉𝒂𝒕 𝒊𝒔 𝒄𝒆𝒍𝒍

Ch 1

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