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Boxes A and B contain unbreakable hearts and breakable hearts in the ratio of 7 ∶ 2 and 3 ∶ 2 respectively. In what ratio should quantities of hearts be taken from A and B and added into Box C so that unbreakable hearts and breakable hearts in box C will be in the ratio of 2 ∶ 1.
Match List-I with List-II and select the correct answer by using the codes given below the list:   List-I (Name of Polymer)   List-II (Uses)  (a)  Polystyrene (i) For making combs and computer discs  (b) Polyvinyl Chloride (ii) As insulator, wrapping material and television cabinets  (c) Urea-formaldehyde resin  (iii) Manufacture of raincoats and vinyl flooring  (d) Bakelite (iv)  For making unbreakable cups and laminated sheets
The polymer used in making plastic crockery is
Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.
Polymer A, also available as copolymer with trifluoroethylene, is a crystalline polymer with a melting point greater than 160 ᵒC and is used in coatings and insulation materials. What is the name of polymer A?
Which of the following is used in the making of unbreakable cups?
A glass reinforced polymer composite comprises of 35 volume % glass fiber and 65 volume % of polymer resin. The elastic moduli of glass and polymer resin are respectively 70 GPa and 3 GPa. The elastic modulus of the composite (in GPa) under iso-strain state is
Unbreakable crockeries are made from __________ polymers.
In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres.
Select the option that correctly represents the relationship among the following: Crockery, Knives, Cups