MEDIUM
6th Foundation
IMPORTANT
Earn 100
A few statements about the centrifugation method are given:
I. The mixture containing very small suspended particles is rotated at a high speed in a centrifuge machine.
II. The denser particles stay at the top.
III. The method is used to separate water from wet clothes in a washing machine.
IV. The method can be used in laboratories for separating plasma and platelets.
The correct statements are:
50% studentsanswered this correctly
Important Questions on Sorting and Separation of Materials
MEDIUM
6th Foundation
IMPORTANT
Shobha took two liquids (coconut oil and water) in a separating funnel as shown in the figure. What would she observe after some time?
MEDIUM
6th Foundation
IMPORTANT
Study the given table showing some daily used items which can be made from more than one material.
| Item | Wood | Plastic | Metal | Glass | |
|---|---|---|---|---|---|
| (i) | Cooking pot | ||||
| (ii) | Storage container | ||||
| (iii) | LPG cylinder | ||||
| (iv) | Tea cup |
Which of these are incorrect?
HARD
6th Foundation
IMPORTANT
A science teacher labelled three glass slides as P, Q and R. She painted slide Q with light blue colour, slide R with black colour and slide P was left as such. Then she asked students to put the slide on a white paper having X mark on it. Students will be able to see the mark clearly (or partially):
HARD
6th Foundation
IMPORTANT
Depending upon the nature of the constituents present in a mixture, Suhana, a class student suggested some methods of separation as shown in the table.
| Types of mixture | Methods of separation | |
|---|---|---|
| Solid — Solid | Handpicking, Sieving | |
| Solid —Liquid (insoluble) | Sedimentation — Decantation, Filtration | |
| Liquid — Liquid (immiscible) | Decantation, Separating funnel | |
| Solid — Liquid (soluble) | Filtration, Decantation | |
| Liquid — Liquid (miscible) | Distillation |
HARD
6th Foundation
IMPORTANT
Study the given flow chart carefully.
P, Q and R could be respectively:
HARD
6th Foundation
IMPORTANT
Four rods of equal length and thickness but of different materials are coated with wax in the same manner. They are fixed to a trough containing hot water. The given diagram illustrates what happens to the wax on each rod after five minutes.
What can you conclude from the given diagram?
(i) The aluminium rod conducts heat better than the brass rod.
(ii) The aluminium rod conducts heat better than the copper rod.
(iii) The glass rod conducts heat better than the copper rod.
(iv) The wax on the copper rod melts faster than the wax on the brass rod.
HARD
6th Foundation
IMPORTANT
Study the given flow chart and identify the processes P, Q, R and S carried out in the given sequence for separation of the mixture.
| P | Q | R | S | |
| (A) | Sublimation | Magnetic separation | Filtration | Evaporation |
| (B) | Magnetic separation | Filtration | Sublimation | Evaporation |
| (C) | Evaporation | Magnetic separation | Filtration | Sublimation |
| (D) | Sublimation | Magnetic separation | Evaporation | Filtration |
HARD
6th Foundation
IMPORTANT
Properties of three substances X, Y and Z are given below:
X : Heavy and non-magnetic
Y : Light and non-magnetic
Z : Magnetic
If X, Y and Z are of the same size and colour then, which of the following can be used to separate these particles from their mixture?
