Winnowing

Q. Define sedimentation and decantation.

Q.

Question 9 (b)

True or false.
A mixture of powdered salt and sugar can be separated by the process of winnowing.

Q.

Differentiate between filtration and decantation.

Q.

Grain and husk can be separated with the process of decantation. (True or False)

1. True
2. False

Q.

The husk from rice can be separated by

1. Cracking

2. Handpicking

3. Winnowing

4. Threshing

Q.

89. What is the principle used in the separation of the mixture?

Q. Identify the following processes involved in the following activites:
Activity 1: Rice and water are taken in a beaker. The mixture is allowed to stand for sometime. Rice settle down at the bottom.

Activity 2: Water is gently poured out into another beaker without disturbing the rice.

1. Activity 1: Filtration
   Activity 2: Decantation
2. Activity 1: Sedimentation
   Activity 2: Decantation
3. Activity 1: Decantation
   Activity 2: Sedimentation
4. Activity 1: Sedimentation
   Activity 2: Filtration

Q.

Question 14

Name and describe briefly a method which can be helpful in separating a mixture of husk from grains. What is the principle of this method?

Q.

Question 5

Four mixtures are given below

(i) Kidney beans and chick peas
(ii) Pulses and rice
(iii) Rice flakes and corn
(iv) Potato wafers and biscuits

Which of these can be separated by the method of winnowing?

Q. Mention the methods that can be used for the separation of the mixture having the following components:
Wheat flour, sugar crystals and husk.

Q.

The husk can be separated from rice by using ___ method.

1. Cracking

2. Handpicking

3. Winnowing

4. Threshing

Q.

Separation of seeds from stalk is called:

1. Threshing

2. Winnowing

3. Handpicking

4. All of These

Q. Which of the following is essential for winnowing?

1. Sieve
2. Water
3. Wind
4. Light

Q.

How will you separate husk or dirt particles from a given sample of pulses before cooking?

Q. X is a separation technique based on the difference in weights of the solids in a solid - solid mixture. What is X?

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

Q.

Name the method used for the separation of fine mud particles suspended in water.

Q. ____________ is used to separate heavier and lighter components of a mixture using wind.

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

Q. What is winnowing? Where is it used?

Q. How does air help in separation of grain from chaff? What is the process known as? [2 MARKS]

Q. Using winnowing, we can separate the grain from the .

1. stalk
2. husk
3. stones

Q.

How are two solid substances separated from a mixture containing two solid substances?

Q. Paheli was feeling thirsty but there was only a pot of water at home which was muddy and unfit for drinking. How do you think Paheli would have made this water fit for drinking if the following materials were available to her. ​

[Alum, tub, muslin cloth, gas stove, thread, pan, and lid.]​

Q.

The husk from rice can be separated by ___ process.

1. Cracking

2. Winnowing

3. Threshing

4. Handpicking

Q.

Difference in the weight of particles is used to separate them by the process of

1. Threshing

2. Sieving

3. Winnowing

4. Filtration

Q. A solid-solid mixture is made up of components which differ by weight. Which amongst the following method can be used to separate the components of the mixture?

1. Sedimentation
2. Decantation
3. Winnowing
4. Sublimation

Q. What is a decantation ?

Q. The difference in magnetic property of components is used for separation in the process of ___.

1. Winnowing

2. Filtration

3. Threshing

4. Sieving

Q. What are the various methods of separation of substances under dry conditions?

1. Sieving

2. Hand Picking

3. Threshing

4. Winnowing

Q.

Which of the following techniques can be used to separate grains from husk?

1. Winnowing

2. Hand-picking

3. Sieving

4. Sublimation

Q. Due to which of the following factors, winnowing is used to separate husk from grains?

1. Husk is very light as compared to grains
2. Husk has a different colour
3. Grains are very light compared to husk
4. Husk and grains are of the same size