Science - Class 6 (C ...

Q1. State True/False

i.             The property used in separating a mixture of two solid by winnowing is difference in weight. ___________

ii.            The chemical used for loading is baking soda. __________

iii.          A mixture of milk and water can be separated by filtration. ______

iv.          A mixture of powdered salt and sugar can be separated by the process of winnowing. ___________

v.           Separation of sugar from tea can be done with filtration. _______

vi.          Grain and husk can be separated with the process of decantation. ___________

vii.        The method in which stalks are beaten to free the grain seeds is called threshing. ___________

viii.       Sieving is used when the component of mixture are of different sizes. ____________

ix.          The method of filtration is also used in the process of preparing cottage cheese in homes. ___________

x.           When no more salt can be dissolved in the given amount of water at particular temperature, the solution is said to be unsaturated. ____________

xi.          Centrifugation is used to separate cream from curd. __________

xii.        Hand picking can be used to separate cashew nuts from mixture of almonds and cashew nuts. ___________

 

Q2. Fill in the blanks.

i.             We can remove small stones from pulses before cooking by_______________.

ii.            The process of separating a liquid from solid sediment is called__________________.

iii.          The method of separating seeds of paddy from its stalks is called______________.

iv.          When milk, cooled after boiling, is poured onto a piece of cloth the cream (malai) is left behind on it. This process of separating cream from milk is an example of________________.

v.           Salt is obtained from seawater by the process of____________.

vi.          Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called________________________.

vii.        ______________method is used to separate stones from grains.

viii.       Husk from wheat can be separated by_______________.

ix.          ____________is used to remove impurities and bran from the flour.

x.           The two liquids that do not mix with each other can be separated by___________________.

xi.          Salt is obtained from_______________.

xii.        We see water drops under the plate that has been used to cover a container containing milk that has just been boiled. This is due to process of__________________.

 

Q3. Write any two methods used for separation of substances.

 

Q4. How can we separate sand from water?

 

Q5. Which method can be used to separate soil from mixture of soil and grains?

 

Q6. Which method would you prefer to separate solid dissolved in liquid?

 

Q7. Which method farmers use to separate grains from bundles of stalk?

 

Q8. Which method do you prefer for tea leaves from prepared tea?

 

Q9 Filtration method is used to separate tea leaves from prepared tea. Which other method can be used?

 

Q10. List various methods of separation of components from their mixtures.

 

Q11. The process of adding alum to water to fasten sedimentation is called loading. Why has this name been given to the process?