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. Both A and B Cloth None of these Filter paper None 2. The process of settling down of heavier, insoluble particles in an undisturbed mixture solution is called: filtration centrifugation decantation sedimentation None 3. 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 Threshing Sieving Filtration None 4. Sieving can be used only when the components of the mixture have: Different lustre Different sizes Different boiling points Different melting points 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: none of the above unsaturated solution saturated solution both A and B None 6. Which of the following represents correct statement(s)? All of the above. 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. In winnowing, the stalks are beaten to free the grain seeds. None 7. 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? Suspension Colloidal solution Saturated solution True solution None 8. Which of the following process is used to obtain common salt from seawater? Filtration Evaporation Distillation Sublimation None 9. What would you observe when an aqueous sugar solution is heated to dryness? Sugar gets mixed with water and vaporize Sugar gets charged Water will vaporize Sugar will be left behind in the container None 10. Which is the correct order to separate salt from a mixture of salt and sand? Filtration, Dissolving, Evaporation Evaporation, Dissolving, Filtration Filtration, Evaporation, Dissolving Dissolving, Filtration, Evaporation None 11. Saturated solution of salt on heating: becomes supersaturated vaporises remains saturated becomes unsaturated None 12. Winnowing is used to separate: different sized particles in the mixture. a mixture of insoluble solid and liquid. heavier and lighter particles of mixture. None of these None 13. Threshing is a method of separation used to separate: tea leaves from tea stones from rice grain from stalk none of the above None 14. 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? Condensation and crystallization Sedimentation and decantation Filtration Evaporation followed by condensation None 15. Winnowing is used for separation of: Heterogeneous solid-solid mixtures Homogeneous solid-solid mixtures Homogeneous solid-liquid mixtures Heterogeneous solid-liquid mixtures None 16. 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 17. A saturated solution of NaCl on heating : becomes unsaturated. becomes supersaturated. vapourises remains saturated. None 18. A solution of sugar in which some more sugar could be dissolved without changing its temperature is called a/an : unsaturated solution solid solution saturated solution None of the above None 19. 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 evaporation sublimation centrifugation None 20. In a saturated solution : None of these Dissolved solute and undissolved solutes are in equilibrium with each other Dissolved solute < < < <<< undissolved solute Dissolved solute > > > >>> undissolved solute 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.