Ncert – class 6- science – Chapter 3: Separation of Substances 2 Welcome to your Ncert - class 6- science - Chapter 3: Separation of Substances 2 1. __________ is/are generally used for filtration. Filter paper None of these Both A and B Cloth None 2. Which is the correct order to separate salt from a mixture of salt and sand? Dissolving, Filtration, Evaporation Filtration, Dissolving, Evaporation Evaporation, Dissolving, Filtration Filtration, Evaporation, Dissolving None 3. What would you observe when an aqueous sugar solution is heated to dryness? Water will vaporize Sugar will be left behind in the container Sugar gets charged Sugar gets mixed with water and vaporize None 4. Winnowing is used to separate: different sized particles in the mixture. None of these heavier and lighter particles of mixture. a mixture of insoluble solid and liquid. None 5. 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 unsaturated solution both A and B none of the above None 6. Sieving can be used only when the components of the mixture have: Different lustre Different boiling points Different melting points Different sizes None 7. Sugar syrup, usually used to coat sweets with sugar, becomes hard when cooled. From this, we can conclude that sugar syrup is: none of these an unsaturated solution a saturated solution not a solution None 8. Saturated solution of salt on heating: remains saturated becomes unsaturated vaporises becomes supersaturated None 9. 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? Saturated solution Suspension True solution Colloidal solution None 10. 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 solid solution saturated solution None 11. Winnowing is used for separation of: Heterogeneous solid-liquid mixtures Homogeneous solid-solid mixtures Homogeneous solid-liquid mixtures Heterogeneous solid-solid mixtures None 12. 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 Condensation and crystallization Filtration None 13. Threshing is a method of separation used to separate: stones from rice none of the above tea leaves from tea grain from stalk None 14. A saturated solution of NaCl on heating : becomes unsaturated. vapourises remains saturated. becomes supersaturated. None 15. In a saturated solution : Dissolved solute > > > >>> undissolved solute Dissolved solute and undissolved solutes are in equilibrium with each other Dissolved solute < < < <<< undissolved solute None of these None 16. 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 centrifugation sublimation evaporation None 17. The process of settling down of heavier, insoluble particles in an undisturbed mixture solution is called: sedimentation filtration centrifugation decantation None 18. Which of the following represents correct statement(s)? In winnowing, the stalks are beaten to free the grain seeds. Winnowing is the process used to separate heavier and lighter components of a mixture by wind or by blowing air. Winnowing is the process that is used to separate grain from stalks. All of the above. None 19. Which of the following process is used to obtain common salt from seawater? Evaporation Distillation Sublimation Filtration None 20. 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 Sieving Threshing Filtration 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.