science
Grade-5
Easy
Question
Which of the following options is correct for the following statements?
(i). Plastics are generally poor conductors of electricity.
(ii). Melamine is a special plastic on which oil and water do not stick.
(iii). Ropes made by Bakelite are used in cranes and elevators
(i). Plastics are generally poor conductors of electricity.
(ii). Melamine is a special plastic on which oil and water do not stick.
(iii). Ropes made by Bakelite are used in cranes and elevators
Hint:
Different type of plastics have different properties and thus different applications.
The correct answer is:
- Plastics are organic in nature meaning they are made up of carbon hence they do not possess any ionic character and do not conduct electricity.
- The special plastic on which oil and water do not stick is Poly-Tetra-Fluoroethylene (PTFE), commonly known as Teflon
- Ropes of cranes and elevators are generally made up of nylon due to high tensile strength.
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