Primitive Methods of Separation

Q.

A technique used for separating components of a mixture of solids based on differences in their particle size is known as _______

1. Distillation

2. Crystallisation

3. Sieving

4. None of the choices

Q.

How to separate a mixture of common salt chalk powder and powdered camphor?(explain)

Q.

Which of the following methods is used for separating stones from grains

1. Coagulation

2. Adsorption

3. Electrophoresis

4. Tyndall effect

Q.

Filtration is helpful in separating an insoluble __________ from a __________.

1. solid, liquid

2. liquid, liquid

3. gas, liquid

4. gas, solid

Q.

Explain the technique for separating: insoluble solid particles in a solid-liquid mixture.

Q.

Which of the following statement is true

Tea leaves from tea can be separated by evaporation.

1. True
2. False

Q.

Ram and Rahul bought a packet of candies. The packet contains candies of different colours. Rahul is fine with any colour but Ram wants only red colour candies. Which method should Ram use in order to pick red colour candies?

1. Sieving

2. Threshing

3. Filtering

4. Hand Picking

Q.

Name any three methods of separating substances in dry conditions, and define them. [3 MARKS]

Q.

Question 4

What is sieving? Where is it used?

Q.

A mixture contains three different substances, X, Y and Z. They are of the same size, cubical in shape and yellow in colour. X particles are very heavy, insoluble, non-magnetic and form $50\%$ of the mixture. Y particles are very light, insoluble, non-magnetic and form $40\%$ of the mixture.
And Z particles are iron pieces. Which of the following methods can separate X, Y and Z?

1. Winnowing and magnetic separation

2. Magnetic separation and handpicking

3. Sieving, magnetic separation and filtration

4. Handpicking , sublimation and sieving.

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 same size

Q. In winnowing, the husk is separated from the grain due to difference in their .

1. size
2. texture
3. colour
4. weight

Q. Stones found among grains are separated by handpicking.

1. True
2. False

Q. Ram and rahul bought a packet of candies. The packet contains candies of different colours. Rahul is fine with any colour but ram wants only red colour candies. What method should ram use to separate the candies?

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

Q.

Study the table given below.
$\begin{array}{ccc}\text{Mixture}& \text{Wanted}& \text{Unwanted}\\ & \text{component}& \text{component}\\ \text{1. Wheat flour}& \text{Flour}& \text{X}\\ \text{2. Y}& \text{Grain seeds}& \text{Stalks}\end{array}$

Based on the above information, identify X and Y.

1. $\begin{array}{ccc}& \text{X}& \text{Y}\\ \text{(A)}& \text{Wheat}& \text{Husk}\end{array}$

2. $\begin{array}{ccc}& \text{X}& \text{Y}\\ \text{(A)}& \text{Wheat}& \text{Sawdust}\end{array}$

3. $\begin{array}{ccc}& \text{X}& \text{Y}\\ \text{(A)}& \text{Husk}& \text{Sand}\end{array}$

4. $\begin{array}{ccc}& \text{X}& \text{Y}\\ \text{(A)}& \text{Husk}& \text{Cut paddy}\end{array}$

Q.

Which device is used to separate pebbles and stones from the sand?

1. Thresher

2. Mesh

3. Sieve

4. Filter paper

Q.

Name the suitable method to separate husk from the grain seeds.

1. Winnowing

2. Threshing

3. Sieving

4. Handpicking