Ncert – class 6- science – Chapter 3: Separation of Substances 2 Welcome to your Ncert - class 6- science - Chapter 3: Separation of Substances 2 1. In a saturated solution : Dissolved solute < < < <<< undissolved solute None of these Dissolved solute > > > >>> undissolved solute Dissolved solute and undissolved solutes are in equilibrium with each other None 2. Rakesh was preparing a true solution of sugar in water in a beaker. By chance, he added sugar in excess. He kept stirring the solution for sometime but the sugar settled down in the beaker. He filtered the solution. What will be the nature of the filtrate? True solution Colloidal solution Suspension Saturated solution None 3. Winnowing is used for separation of: Homogeneous solid-liquid mixtures Heterogeneous solid-solid mixtures Homogeneous solid-solid mixtures Heterogeneous solid-liquid mixtures None 4. Which of the following represents correct statement(s)? Winnowing is the process used to separate heavier and lighter components of a mixture by wind or by blowing air. All of the above. Winnowing is the process that is used to separate grain from stalks. In winnowing, the stalks are beaten to free the grain seeds. None 5. To separate a mixture in which the solid is insoluble in the liquid, and is also heavier than the liquid, which of the following methods of separation are most suited? Sedimentation and decantation Filtration Evaporation followed by condensation Condensation and crystallization None 6. A saturated solution of NaCl on heating : becomes supersaturated. remains saturated. becomes unsaturated. vapourises None 7. Which of the following process is used to obtain common salt from seawater? Evaporation Distillation Filtration Sublimation None 8. A solution of sugar in which some more sugar could be dissolved without changing its temperature is called a/an : None of the above unsaturated solution saturated solution solid solution None 9. Threshing is a method of separation used to separate: grain from stalk tea leaves from tea none of the above stones from rice None 10. The process of settling down of heavier, insoluble particles in an undisturbed mixture solution is called: decantation filtration centrifugation sedimentation None 11. Winnowing is used to separate: different sized particles in the mixture. heavier and lighter particles of mixture. None of these a mixture of insoluble solid and liquid. None 12. Salt can be recovered from its solution by evaporation. Another technique which can be used for the separation of a salt from its solution is : crystallization sublimation centrifugation evaporation None 13. Saturated solution of salt on heating: remains saturated becomes unsaturated becomes supersaturated vaporises None 14. At a particular temperature, a solution that has dissolved as much solute as it is capable of dissolving is said to be a: both A and B none of the above unsaturated solution saturated solution None 15. What would you observe when an aqueous sugar solution is heated to dryness? Sugar will be left behind in the container Water will vaporize Sugar gets charged Sugar gets mixed with water and vaporize None 16. Which is the correct order to separate salt from a mixture of salt and sand? Filtration, Evaporation, Dissolving Filtration, Dissolving, Evaporation Dissolving, Filtration, Evaporation Evaporation, Dissolving, Filtration None 17. Sugar syrup, usually used to coat sweets with sugar, becomes hard when cooled. From this, we can conclude that sugar syrup is: a saturated solution not a solution an unsaturated solution none of these None 18. __________ is/are generally used for filtration. None of these Both A and B Filter paper Cloth None 19. A mixture contains two solids A and B. Solid A is light in weight while solid B is very heavy. Their sizes are almost the same. Here, A is the unwanted component. To get pure solid B, which separation method would you suggest? Winnowing Filtration Threshing Sieving None 20. Sieving can be used only when the components of the mixture have: Different sizes Different boiling points Different lustre Different melting points None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.