Solved Questions on Methods of Separation and Classification of Materials
1. Which material would be the best choice for a windowpane to allow light to pass through clearly?
a) Metal
b) Ceramic
c) Frosted glass
d) Clear glass
Answer: d) The best choice for a windowpane to allow light to pass through clearly is clear glass. Clear glass is transparent, which means it allows light to pass through without scattering or blurring it significantly.
2. Terry made tea by boiling some tea leaves in water. Which of the following methods should he use to separate the leaves from the tea?
a) Sedimentation
b) Decantation
c) Filtration
d) Evaporation
Answer: c) To separate the tea leaves from the tea, Terry should use the method of filtration. Filtration involves passing the mixture through a filter, which will trap the solid particles (tea leaves) while allowing the liquid (tea) to pass through.
3. Which material would be the best choice for a pot handle to prevent burns when cooking?
a) Metal
b) Wood
c) Plastic
d) Glass
Answer: b) The best choice for a pot handle to prevent burns when cooking would be wood. Wood is a good insulator of heat and does not conduct heat as effectively as metal, plastic, or glass.
4. What is the purpose of using filter paper or sieve in the process of filtration?
a) To trap the insoluble particles
b) To speed up the filtration process
c) To collect the soluble substances
d) To evaporate the liquid
Answer: a) The purpose of using filter paper or sieve in the process of filtration is to trap the insoluble particles present in a mixture and allow the liquid or solvent to pass through.
5. Match the following.
a) 1:B, 2:C, 3:A
b) 1:C, 2:A, 3:B
c) 1:A, 2:C, 3:B
d) 1:B, 2:A, 3:C
Answer: d) Plastic Bag: Transparent and Waterproof
Sponge: Opaque and porous
Tissue paper: Translucent and Porous
FAQs on Methods of Separation and Classification of Materials
1. What are the different methods used to separate materials?
Materials are separated according to their qualities using various methods. Magnetism, evaporation, sedimentation, decantation and filtering are typical techniques. These methods helps in the separation of various components from a mixture.
2. What is the sedimentation method of separation?
The process by which solid particles sink to the bottom of a liquid is known as sedimentation. The lighter liquid stays above while the heavier particles eventually settle to the bottom and create sediment.
Examples: Sand and water or muddy water are combinations of particles and liquids that are often separated using this technique.
3. What is the process of evaporation in material separation?
A liquid is heated and the vapour is collected, leaving the solid components behind, in a process called evaporation. It is often used to extract dissolved particles from liquids, such as salt and water.
4. How does sieving help us classify materials?
It is similar to using a particular strainer when sieving. It assists in the size-based separation of materials, allowing smaller items to pass through while larger materials are kept on top.
5. What is the classification of Composite materials?
Composite materials are classified based on the types of materials they are made of. There are two main categories:
- Reinforced Composites
- Particulate Composites
