Solutions-Class-6-General Science-Chapter-3-Let’s Separate the Components-Maharashtra Board

• Substance remaining on the strainer: The substance that remains on top is in the solid state (the insoluble tea leaves).
• Substance falling through: The substance that passes through the mesh is in the liquid state (the brewed tea).

No, filtering muddy water through a simple cloth or tea strainer will not yield completely clean water.

• The openings/pores in a cloth or tea strainer are relatively large, allowing tiny suspended soil and mud particles to pass right through along with the water.
• To properly clean muddy water, a medium with extremely microscopic pores—such as specialized filter paper—is required.

Wearing a mask functions on the principle of filtration.

• Masks act as a fine filter with tiny pores that trap airborne pathogens, microscopic dust, and respiratory droplets present in crowded spaces or hospitals, preventing them from entering our nose and mouth when we breathe.

Separating magnetic materials from municipal garbage is necessary because:

• Resource Recovery: Magnetic metals like iron, cobalt, and nickel are valuable raw materials used in the manufacturing of many everyday items.
• Recycling and Waste Reduction: Using large magnets or electromagnets allows municipal systems to extract these metals from town waste so they can be recycled and reused rather than wasted in landfills.

(c) magnetic property

(b) handpicking (or d - sieving)

Explanation: In daily households, small stones are typically separated from wheat by handpicking because they differ in color, shape, and appearance, and are few in number. However, if the mixture is in large bulk quantities and the stones differ in size from wheat grains, sieving using an appropriate mesh is also highly useful. Threshing is used to beat grain from stalks, and winnowing separates light chaff from heavy grains, so they are not suitable for stones.

(a) evaporation

(d) not possible by any of these methods.

True.

False.
Reasoning: Only magnetic metals such as iron, cobalt and nickel are attracted to a magnet and get separated; non-magnetic metals like aluminium and copper are not attracted and remain behind.

False.

Reasoning: Salt dissolved in sea water is separated by evaporation. Sedimentation only works for insoluble, heavy solid particles (like clay or sand) that can settle at the bottom over time. Dissolved salt will never settle to the bottom of seawater by gravity; it must be separated by evaporation.

True.

True. (For example, oil and water — after the two liquids settle into separate layers, the lighter liquid on top can be carefully poured off.)

Filtration is useful for a mixture of a liquid and an insoluble solid (a solid that does not dissolve in the liquid).

• The mixture is passed through a filter paper, cloth, or fine strainer.
• The insoluble solid particles, being larger than the pores of the filter, are retained on it, while the liquid passes through as clear filtrate.
• For example, muddy water can be filtered through filter paper to separate mud from clear water.

Sawdust floats on water because it is lighter than water and insoluble in it.

Filtration can be used to separate sawdust from water.

• Pass the mixture through a filter paper or fine sieve.
• The sawdust remains on the filter.
• The water passes through.

Therefore, filtration is the suitable method.

A carpenter can use these methods to separate iron nails from sawdust:

1. Magnetic separation: Pass a magnet over the mixture. The iron nails will be attracted to the magnet, while the sawdust will remain behind.
2. Handpicking: Pick out the iron nails by hand if there are only a few nails.
3. Sieving: Use a sieve with suitable-sized holes. The sawdust can pass through, while larger nails remain on the sieve.

Easiest method : Magnetic separation is the easiest and fastest method because iron is attracted to a magnet but sawdust is not.

This table details the location of all 8 major separation methods hidden in the word search puzzle.