Sorting Materials into Groups
NCERT Solution
State whether the statements given below are True or false
- Stone is transparent, while glass is opaque.
- A notebook has luster, while eraser does not.
- Chalk dissolves in water.
- A piece of wood floats on water.
- Oil mixes with water.
- Sand settles down in the water.
- Vinegar dissolves in water.
Answer: 1 False, 2 False, 3 False, 4 True, 5 False, 6 True, 7 True
Answer the following questions
Question 1: Name the objects which can be made from iron and wood.
Answer: Wooden items: window, door, sofa, chair, etc.
Iron items: Car, truck, bridge, utensil, grill, etc.
Question 2: Select those objects from the following which shine.
Glass bowl, plastic toy, steel spoon, cotton shirt.
Answer: Glass bowl and steel spoon
Question 3: List all items known to you that float on water. Check and see if they will float on an oil or kerosene.
Answer: Items; like wood, cork, Styrofoam, etc. float on water as well as on oil.
Question 4: Name two materials which are soluble in water.
Answer: Sugar and salt.
Question 5: Name two transparent and two opaque materials.
Answer: Glass, acrylic sheet are transparent materials, while stone and wood are opaque materials.
Question 6: What are metals?
Answer: The substance which is hard, has luster and is good conductor of heat and electricity is called metal.
Question 7: What is transparent material?
Answer: The material which allows light to pass through it is called transparent materials.
Question 8: Match the objects given below with the materials from which they could be made. Remember, an object could be made from more than one material and a given material could be used for making many objects.
Answer:
| Objects | Materials |
|---|---|
| Books | Paper |
| Chair | Wood, plastic |
| Toy | Plastic, wood, paper |
| Shoes | Leather, plastic |
Answer the following questions
Question 9: Given below are names of some objects and materials.
Water, basketball, orange, sugar, globe, apple and earthen pitcher.
Group them as:
- Round shaped and other shapes.
Answer: Round-shaped: Basketball, orange, globe and earthen pitcher. - Eatables and non eatables
Answer: Eatables: Water, orange, sugar and apple.
Non-eatables: Basketball, globe and earthen pitcher.
Question 10: Find the odd one out from the following.
- Chair, bed, table, baby, cupboard
Answer: Baby is a living being, while others are non-living. - Rose, jasmine, Boat, Marigold, Lotus.
Answer: Boat is a mode of transport, while others are flowers. - Aluminium, iron, copper, silver, sand.
Answer: Sand is non-metal, while others are metals. - Sugar, Salt, sand, copper sulphate.
Answer: Sand is insoluble in water, while others are soluble in water.