Ncert – class 6- science – Chapter 3: Separation of Substances 2 Welcome to your Ncert - class 6- science - Chapter 3: Separation of Substances 2 1. 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 : centrifugation evaporation crystallization sublimation None 2. In a saturated solution : None of these Dissolved solute < < < <<< undissolved solute Dissolved solute and undissolved solutes are in equilibrium with each other Dissolved solute > > > >>> undissolved solute None 3. A saturated solution of NaCl on heating : becomes unsaturated. becomes supersaturated. remains saturated. vapourises None 4. Sieving can be used only when the components of the mixture have: Different melting points Different boiling points Different lustre Different sizes None 5. Winnowing is used for separation of: Heterogeneous solid-liquid mixtures Homogeneous solid-liquid mixtures Homogeneous solid-solid mixtures Heterogeneous solid-solid mixtures None 6. 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? Filtration Winnowing Threshing Sieving None 7. Which of the following process is used to obtain common salt from seawater? Distillation Evaporation Sublimation Filtration None 8. What would you observe when an aqueous sugar solution is heated to dryness? Sugar will be left behind in the container Sugar gets charged Water will vaporize Sugar gets mixed with water and vaporize None 9. 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? Evaporation followed by condensation Sedimentation and decantation Filtration Condensation and crystallization None 10. 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 Suspension Saturated solution Colloidal solution None 11. Which is the correct order to separate salt from a mixture of salt and sand? Dissolving, Filtration, Evaporation Filtration, Evaporation, Dissolving Filtration, Dissolving, Evaporation Evaporation, Dissolving, Filtration None 12. Threshing is a method of separation used to separate: grain from stalk stones from rice tea leaves from tea none of the above None 13. Winnowing is used to separate: heavier and lighter particles of mixture. a mixture of insoluble solid and liquid. different sized particles in the mixture. None of these None 14. The process of settling down of heavier, insoluble particles in an undisturbed mixture solution is called: filtration centrifugation sedimentation decantation None 15. At a particular temperature, a solution that has dissolved as much solute as it is capable of dissolving is said to be a: saturated solution none of the above unsaturated solution both A and B None 16. Saturated solution of salt on heating: becomes supersaturated becomes unsaturated vaporises remains saturated None 17. A solution of sugar in which some more sugar could be dissolved without changing its temperature is called a/an : unsaturated solution None of the above saturated solution solid solution None 18. Sugar syrup, usually used to coat sweets with sugar, becomes hard when cooled. From this, we can conclude that sugar syrup is: an unsaturated solution a saturated solution none of these not a solution None 19. __________ is/are generally used for filtration. Filter paper None of these Cloth Both A and B None 20. 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 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.