Sieving

Q.

Which process is used for separating particles of different sizes?

1. Decantation
2. Sieving
3. Sedimentation

4. Distillation

Q. Study the table given below.
$\begin{array}{ccc}Mixture& Wanted& unwanted\\ & component& component\\ 1.Wheatflour& Flour& X\\ 2.Y& Grainseeds& Stalks\end{array}$
Based on the above information, identify 'X' and 'Y'.

1. $\begin{array}{ccc}& X& Y\\ \left(A\right)& Husk& Cutpaddy\end{array}$
2. $\begin{array}{ccc}& X& Y\\ \left(A\right)& Wheat& Husk\end{array}$
3. $\begin{array}{ccc}& X& Y\\ \left(A\right)& Wheat& Sawdust\end{array}$
4. $\begin{array}{ccc}& X& Y\\ \left(A\right)& Husk& Sand\end{array}$

Q.

Potatoes can be separated from tomatoes by ________.

1. winnowing
2. threshing
3. handpicking
4. sieving

Q. is used to separate heavier components of a mixture from the lighter components with the help of wind.

1. Sieving
2. Winnowing
3. Threshing

Q. Husk is lighter than grains, so it can be separated from grains by _____________.

1. distillation
2. chromatography
3. sublimation
4. winnowing

Q. Separation of the components of a mixture can give more than one useful substance.

1. True
2. False

Q. Match the devices used in separation with their separation techniques.

1. 
2. Winnowing
3. 
4. 
5. Sieving
6. Filtration

Q. While preparing chapatis, Paheli found that the flour to be used was mixed with wheat grains. Which among the following is the most suitable method to separate the grains from the flour?

1. Winnowing
2. Sieving
3. Threshing
4. Filtration

Q. Which of the following mixtures cannot be separated by sieving ?

1. Sugar & water
2. Husk & flour
3. Oil & water
4. Salt & water
5. Apples & pears
6. Rice & dust
7. Pebbles & sand
8. Milk & water

Q. Threshing is the process used to separate from.

1. chaff
2. stalk
3. grains
4. husk

Q. is used to separate heavier components of a mixture from the lighter components with the help of wind.

1. Winnowing
2. Sieving
3. Threshing

Q. Potatoes can be separated from tomatoes by ________.