Threshing

Q.

Which technique is used to separate salt from seawater?

Q.

How to separate grain and husk?

Q.

What is winnowing, sieving, threshing, hand picking

Q.

You are provided with a mixture of sand, oil, salt, and water. Write the steps involved in separating sand, soil, salt, and water from the given mixture along with the activity and a labeled diagram.

Q.

Name the method used for the separation of wheat grains from husk.

Q. Grains are separated from stalks by _______ .

1. Sedimentation method
2. Threshing method
3. Winnowing method
4. Decantation method

Q.

The principle behind using winnowing as a method of separation is based on the difference in _________ of the particles.

1. size

2. color

3. weight

4. shape

Q.

The term used for the process of separation of grains from the chaff is

1. Sieving

2. Threshing

3. Winnowing

4. handpicking

Q.

State the technique involved in the separation of the components of the given mixture:

Potassium chloride from an aqueous solution of potassium chloride

Q.

Which of the following mixtures would you be able to separate using the method of filtration?

1. Oil in water

2. Cornflakes in milk

3. Salt in water

4. Sugar in milk

Q. Identify the process that is carried out after harvesting and before winnowing.

1. Sowing
2. Removing weeds
3. Adding manure
4. Threshing

Q. What is the property used to separate two solids from a mixture by the process of winnowing?

1. Difference is colour
2. Attraction by magnet
3. Difference in weight
4. Difference in size

Q. The process of beating wheat stalks to separate the grains is called _______.

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

Q. The method in which stalks are beaten to free the grain seeds is called___.

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

Q. The process of beating wheat stalks to separate the grains is called _______.

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

Q. Given below are some methods of separation.

Which of the following methods of separation does not require air?

1. Only X
2. X, Y and Z
3. Only Y, Z
4. Only Z, X

Q. Read the story titled “WISE FARMER” and tick the correct option to complete the story.​

​

A farmer was sad/happy to see his healthy wheat crop ready for harvest. He harvested the crops and left them under the sun/rain to dry the stalks. To separate the seeds from the bundles of the stalk he handpicked/threshed them. After gathering the seed grains he wanted to separate the stones and husk from it.​

His wife winnowed/threshed them to separate the husk and later sieved/handpicked to remove stones from it. She ground the wheat grains and sieved/filtered the flour. The wise farmer and his wife got a good price for the flour. Can you tell why?​

Q.

The mixture of dry leaves and sand can be separated by the process of threshing.True/False

1. True

2. False

Q. True or false?​
(a) A mixture of milk and water can be separated by filtration.​
(b) A mixture of powdered salt and sugar can be separated by the process of winnowing.​
(c) Separation of sugar from tea can be done with filtration.
(d) Grain and husk can be separated with the process of decantation.​

Q. The method of separating paddy seeds from its stalks is called as _______ .

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

Q. You are provided with a mixture of ammonium chloride and sodium chloride. Describe the technique you would use to separate these constituents from the mixture.

Q.

How will you separate a mixture containing carbon, sulphur and sodium chloride?

Q. Describe an activity to separate a mixture of sand and salt.

Q.

Fill in the blanks with the appropriate word: ____ are obtained from stalks by threshing.

Q. The process of beating bundle of stalks to remove grains is called _______.

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

Q.

The mixture of dry leaves and sand can be separated using threshing.

1. True

2. False

Q. A mixture of oil and water can be separated by using a ___.

1. Cracking

2. Handpicking

3. Winnowing

4. Threshing

Q. Which of the following factor is taken into consideration to separate wheat from husk in the winnowing process?

1. Colour
2. Size
3. Texture
4. Weight

Q.

In villages, we can see that women separate the grains from the chaff by throwing the grains from a certain height to fall back into a vessel.What is this process? Explain.[3 MARKS]

Q. Explain the method of separation of solid-liquid mixtures.