Chapter 3
Exercises
Let’s Separate the Components
Grade 6 Science • Maharashtra State Board
(1) Choose the correct option.
(1) In magnetic separation, ................ is used.
Answer: (c) Magnetic property
(2) To separate small stones from wheat, the ................ method is useful.
Answer: (b) Handpicking
(3) Alum dissolved in water can be separated using the ................ method.
Answer: (a) Evaporation
(4) There is a doubt that water is mixed with milk. Separating the milk and water will be possible through ................ method.
Answer: (d) Not possible by any of these methods
(2) State whether true or false. If false, state why.
(1) The filtration method is used to separate substances that are not dissolved in a liquid.
True
(2) Using magnetic properties, all metals can be separated from garbage.
False
Only magnetic metals such as iron, cobalt and nickel can be separated from garbage using a magnet.
(3) The sedimentation method is used to separate salt from seawater.
False
Salt is separated from seawater by the evaporation method.
(4) The winnowing method is used to separate lightweight debris from grains.
True
(5) The decantation method can be used to separate two liquids, one heavy and one light.
True
(3) For which type of mixture is the filtration method useful and how?
Answer
The filtration method is useful for a mixture of a liquid and an insoluble solid. The mixture is passed through a strainer, a fine sieve or filter paper. The insoluble solid particles remain on the filter, while the liquid passes through its tiny pores.
Example: Muddy water can be filtered using filter paper.
(4) How will you separate sawdust mixed in a container of water?
Answer
Sawdust is an insoluble solid. Therefore, it can be separated from water by filtration.
Pour the mixture through a strainer, fine sieve or filter paper. The sawdust will remain on the filter, while the water will pass through it.
(5) While working, a carpenter finds that iron nails have mixed with sawdust. Which different methods can the carpenter use to separate them? Which of those methods is the easiest?
Answer
1. Handpicking
The carpenter can pick out the iron nails from the sawdust by hand.
2. Magnetic Separation
The carpenter can move a magnet over the mixture. The iron nails will be attracted towards the magnet and separated from the sawdust.
Magnetic separation is the easiest method because iron nails are attracted towards a magnet, while sawdust is not.
(6) In the word search below, some words related to separation are given. One example has been circled for you. Find all such words in the word search and write them down.
Observe the word-search puzzle carefully and find the names of the separation methods.
Answer
- Sedimentation
- Winnowing
- Decantation
- Sieving
- Magnetic Separation
- Evaporation
- Filtration
- Churning
Note: Magnetic Separation is written backwards in the eighth row of the word search.
NOITARAPES CITENGAM
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