Related Questions

__________ polymer is used for making unbreakable crockery.
A Thermoplastic
B Melamine
C Addition
D None of these
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.
A Acrylic
B Polyester
C Nylon 6:6
D Polypropylene
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.
A Polythene
B PVC
C Rayon
D Polyvinyl acetate
In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer?
A Bakelite (phenol formaldehyde)
B Polyester
C Polythene
D Nylon-6
Plastic bottles are made of a polymer called PET. The expanded form of PET is
A Polyethylene terephthalate
B Polyethyl terelene
C Polyethylene triphosphate
D Polyethyl tetrachloride
The name of plastic polymer from which combs, toys, bowls etc., can be made, is
A Polyurethane
B Polystyrene
C Metallic polysulphides
D Teflon
A machine produces 1,000 units of plastic chair per hour . Working continuously at this rate, how many plastic chairs will this machine produce in a week ?
A 7,000
B 68,000
C 268,000
D 168,000
Suppose you are the account holder of a bank. The bank . The bank offered you a plastic card with a credit limit of TK. 20.000 and your account has to be settled in full at the end of each month. Usually there is an annual fee for using this credit facility . This type of plastic card is called ?
A Debit Card
B Credit Card
C Charge Card
D Pre-paid Card
In case of a simply supported rectangular beam of span L and loaded with a central load W, the length of elasto-plastic zone of the plastic hinge, is
A $$\frac{{\text{L}}}{2}$$
B $$\frac{{\text{L}}}{3}$$
C $$\frac{{\text{L}}}{4}$$
D $$\frac{{\text{L}}}{5}$$
In case of a simply supported I-section beam of span L and loaded with a central load W, the length of elasto-plastic zone of the plastic hinge, is
A $$\frac{{\text{L}}}{2}$$
B $$\frac{{\text{L}}}{3}$$
C $$\frac{{\text{L}}}{4}$$
D $$\frac{{\text{L}}}{5}$$

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