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प्रश्न
Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.
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उत्तर
No. The handle and bristles of a tooth brush should be made of different materials. The handle of a toothbrush should be hard and strong, while the bristles should be soft and flexible.
संबंधित प्रश्न
Fill in the blanks with appropriate words.
Like synthetic fibres, plastic is also a _______
Explain the difference between thermoplastic and thermosetting plastics.
Explain why the following is made of thermosetting plastics.
Saucepan handles
Who is my partner?
| 'A' column | 'B' column |
| a. Lead glass | i. Plates |
| b. Bakelite | ii. Mattresses |
| c. Thermocol | iii. Electric bulb |
| d. Optic glass | iv. Electric switch |
| e. Polypropylene | v. Lens |
Write the natural or manmade raw material of the following items.
Mattress, glass vessel, bangle, chair, gunny bag, broom, knife, pen.
Give example of material that can be used again.
______ are used to identify different types of plastics.
Which of the following is non–bio degradable?
Most one-time-use plates are made from ______.
Answer the following by rearranging the jumbled letters :
Expanded polystyrene is commercially known as ______.
mthreolco
