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