CBSE ADDA

Q.1 Define matter. Ans: Anything that occupies space and has mass and is felt by senses is called matter. Q.2 what happens if you put copper sulphate crystals in water? Ans: Copper sulphate crystals mixed between the spaces of molecules of water and disappear. Q.3 A substance has a definite volume but no definite shape? State whether this substance is a solid, a liquid or a gas. Ans: Liguid Q.4 Arrange the following substances in increasing order of force of attraction between the particles.  (a) Milk (b) Salt (c) Oxygen. Ans: Oxygen < Milk< Salt Q.5 A substance has neither a fixed shape nor a fixed volume . State whether it is a solid , a liquid or a gas. Ans: Gas Q.6 The melting point of a substance is below the room temperature. Predict its physical state. Ans: Ice Q.7 What is vapour ? Ans: A substance that found in gaseous state only at room temperature is called Vapour Q.8 Name the temperature at which the solid and liquid state