What is a material? Differentiate between natural and synthetic materials.
Important Questions on Sorting Materials into Groups
Match the following.
| (i) | grouping by author's name | (a) timetable |
| (ii) | grouping by pattern | (b) batteries |
| (iii) | grouping by size | (c) world population |
| (iv) | grouping by softness | (d) library shelves |
| (v) | grouping by subject | (e) wrapping paper |
| (vi) | grouping by country | (f) towels |
RYIDSTVEI
Rahul's father is building a new house for them. Rahul's father was requested by the carpenter to get nails from the store. Rahul went with his father to the hardware store and purchased some nails. Rahul's father made him hold the carry bag containing nails on the bike. Rahul felt that the nails were very heavy and wished that the nails need to be lightweight to make it easier to carry and transport.
a) Which material is used to make nails?
b) What will happen if nails are made of plastic?
What is the reason of choosing these materials to make it?
Payal’s teacher asked all the students to bring lemon, sugar and water to make Nimbu paani in the class. Payal added sugar and salt to water and stirred it with a spoon. She saw that sugar and salt got disappeared in water. Then she added lemon juice which also gets mixed well in the water to make delicious nimbu paani.
Based on the information answer the following question:
Why did sugar and salt disappear in water?
Classify the following into transparent, translucent and opaque materials :
Butter paper, Cardboard, Ground glass, Clear glass, Water, Air, Brick wall, Aluminium sheet
To classify the materials as natural or human-made
1. Make a list of three different objects.
2. Write the different materials the objects are made of.
| Objects | Materials |
