Sedimentation and Decantation

Q.

How can you separate the mixture of sand and water?

1. Threshing

2. Evaporation

3. Decantation

4. Sedimentation

Q.

What is the use of sedimentation and decantation and filtration because still after this processes germs are there in water, can we directly do distillation for insoluble impurities instead of these processes

Q.

Which of the following mixtures can be separated by sedimentation process?

1. Seawater

2. Sugar solution

3. Lemonade

4. Muddy water

Q.

The process of separation of the clear liquid present above the settled insoluble solid after sedimentation of a mixture is called ________ .

1. Decantation

2. Evaporation

3. Filtration

4. Winnowing

Q.

Loading is a process in which -

1. Impurities become heavy and sink to the bottom

2. Impurities float on the top

3. Impurities vaporize

4. None of these

Q.

the process of transferring the clear liquid above the solid particles which settle at the bottom of the container is known as

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Q. Water containing sand can be separated by the method of sedimentation, followed by decantation. The principle behind sedimentation and decantation techniques is:

1. One of the components is soluble in liquid.
2. One of the components is non-volatile.
3. One of the components is heavier than the liquid, and it is insoluble.
4. One of the components is a solid, and it is insoluble in liquid.

Q.

Ravi has a mixture of sugar and small pieces of stones. He wants to separate the two materials. What are the processes which he can use to separate the items? Explain. [5 MARKS]

Q.

Question 13

State whether the following statements are true or false.

(a) A mixture of oil and water can be separated by filtration.
(b) Water can be separated from salt by evaporation.
(c) A mixture of wheat grains and wheat flour can be separated by sieving.
(d) A mixture of iron filings and rice flour can be separated by magnet.
(e) A mixture of wheat grains and rice flakes can be separated by winnowing.
(f) A mixture of tea leaves and milk can be separated by decantation.

Q.

In one of the stages of wastewater treatment, the solid impurities are allowed to settle down at the bottom. This particular stage in the entire purification is called ___

1. Chlorination

2. Sublimation

3. Sedimentation

4. Evaporation

Q.

The impurity that remains during the settlement of insoluble substances is called :

1. Distillate water

2. Sediment

3. Filtrate

4. Suspension

Q. By adding alum in the water, the rate of sedimentation:

1. increases
2. decreases
3. first increases then decreases
4. remains same

Q.

You are handed a mixture of sand and salt. How do you separate the two substances? Anything added to the mixture has to be retrieved. [5 MARKS]

Q.

In one of the stages of wastewater treatment, the solid impurities are allowed to settle down at the bottom. This particular stage in the entire purification is called ___

1. Sedimentation

2. Chlorination

3. Sublimation

4. Evaporation

Q.

Ravi is having a mixture of sugar and small pieces of stones.He decided to separate the two materials.What are the processes which can be involved in it?Explain. [5 MARKS]

Q.

Oil can be separated from water using

1. Filtration

2. Decantation

3. Both sedimentation and filtration

4. Sedimentation

Q.

Separation of kerosene oil and water is done by ___

1. Decantation

2. Sedimentation

3. Filtration

4. Evaporation

Q.

What do we mean by decantation process?

1. Dissolution
2. Decantation
3. Filtration
4. Sedimentation

Q.

_______ is the process of separation of lighter liquid from the denser immiscible liquid.

1. Evaporation

2. Sedimentation

3. Decantation

4. Filtration