Tag: garbage in, garbage out
Questions Related to garbage in, garbage out
_______ provides good heat and sound insulation.
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Propylene
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Styrofoam
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Polythene
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Acrylic
Polystyrene foam also known as Styrofoam is brittle in tension, lightweight, with good heat and sound insulation. It is available in blocks and used for product-modelling.
Define plasticity :
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Ability to regain its original shape.
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Ability to flow when subjected to stress.
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Ability to change shape permanently.
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Both b and c.
Plasticity, ability of certain solids to flow or to change shape permanently when subjected to stresses of intermediate magnitude between those producing temporary deformation, or elastic behaviour, and those causing failure of the material, or rupture.
Plastics are ____________ in water.
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highly soluble
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slightly soluble
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insoluble
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sparingly soluble
Plastics are insoluble in water and it cannot be dissolved in water.
When plastics are burnt toxic substances are released into air causing ___________ pollution.
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water
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air
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soil
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None of these
When plastics are burnt toxic substances are released into $air$ causing air pollution. The sentence is self-explanatory.
We come to a conclusion, that plastics are bad conductors of electricity from the following.
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Refrigerators and freezers have a plastic foam core
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Electrical wires have a plastic covering
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Cooking pans have plastic handles
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We use to prepare parachutes
Most of the commonly used household electronics like freezers, washing machine, etc are made of plastic since it is the bad conductor of electricity.
Which of the following is/are reasons of using plastics?
1.They are transparent.
2. They are cheap.
3. They can be moulded into diffrent shapes.
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(1) only
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(2) only
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(1) and (3) only
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(2) and (3) only
Fibre obtained by chemical treatment of wood pulp is called:
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natural Silk
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rayon
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nylon
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polyster
Which is NOT the general characteristics of plastics?
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Good electrical insulators
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Acceptable acoustic insulation
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Resistant to corrosion and many chemical factors
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Have a high production cost
The IUPAC name for Teflon is:
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polytrifluoroethane
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polytetrafluoroethane
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polytrifluoroethylene
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polytetrafluoroethylene
Teflon constitutes:
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carbon,flourine & hydrogen
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carbon,chlorine & hydrogen
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carbon & flourine
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carbon & chlorine