Q54. Name two polyester fabrics and write their uses.


Q55. Why should we not wear synthetic clothes while working in in the kitchen or in a laboratory?


Q56. Differentiate between natural and synthetic fibres.


Q57. “Even though plastics are very useful, they are not environment friendly.” Justify the statement.


Q58. ‘Avoid plastics as far as possible’. Comment on this advice.


Q59. Suggest some ways to solve plastic pollution.


How can pollution due to plastics be solved?


Q60. Explain the difference between the thermoplastic and thermosetting plastics.


Q61. Why we should not throw polybags in the water bodies or on the road?


Q62. Categorise the materials of the following products into ‘can be recycled’ and ‘cannot be recycled’:

Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electrical switches.


Q63. Describe an activity to show that thermoplastic is a poor conductor of electricity.


Q64. Differentiate between biodegradable and non-biodegradable materials.


Last modified: Tuesday, 14 May 2019, 9:28 PM