How Things are Made
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
How Things are Made
SubtopicHow Things are Made under How Things are Made for Grade 4 CBSE.
Preview questions (no answers)
- 1.
Which material is mostly used for making school bags?
A.Glass
B.Synthetic fabric or canvas
C.Iron
D.Clay
- 2.
What material is used to make a cricket bat?
A.Metal
B.Plastic
C.Wood
D.Glass
- 3.
Which of these is a synthetic (man-made) fiber?
A.Cotton
B.Wool
C.Nylon
D.Silk
- 4.
What is used to make the mirror's reflective surface?
A.Only wood
B.Glass coated with metal
C.Plastic
D.Paper
- 5.
In the chocolate-making process shown in the flowchart, what happens during the 'Roasting' stage (Step C)?
A.The seeds are planted in the soil to grow more cocoa trees.
B.The pods are washed in cold water to keep them fresh.
C.The beans are heated to develop their characteristic flavor and aroma.
D.The finished chocolate bars are packed into cardboard boxes.
- 6.
What is the primary reason for painting iron gates?
A.To make them heavier
B.To prevent them from rusting
C.To make them transparent
D.To turn them into steel
- 7.
Which of the following is a natural material that does not need to be 'made' in a factory, but only shaped?
A.Plastic
B.Glass
C.Stone
D.Nylon
- 8.
What is the primary difference between 'Pig Iron' and 'Wrought Iron' during the manufacturing process?
A.Pig iron is made by animals, wrought iron is made by machines
B.Pig iron has a high carbon content and is brittle, while wrought iron is pure and malleable
C.Pig iron is always pink in color
D.Wrought iron is made from plastic
- 9.
During the production of bio-plastics, which natural resource is often used as a substitute for petroleum?
A.Iron ore
B.Corn starch or sugarcane
C.Salt water
D.Sand
- 10.
What is 'Solder', an alloy used in electronics manufacturing, typically made of?
A.Gold and Silver
B.Tin and Lead
C.Aluminum and Iron
D.Copper and Zinc
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