# PHYSICS TEST

Jun 17th, 2015
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Q.1. Consider the following two statements: Kirchhoff's junction law follows from the conservation of charge. Kirchhoff's loop law follows from the conservation of energy Which of the following is correct? Both (A) and (B) are wrong (A) is correct and (B) is wrong(A) is wrong and (B) is correct (4) Both (A) and (B) are correct

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PROPERTIES OF MATERIALS - 1When studying materials and especially when selecting materials for a project / design, it is important to understand key properties. The most important properties are outlined below.PDF FILE-CLICK HERE FOR PRINTABLE EXERCISESTRENGTHThe ability of a material to stand up to forces being applied without it bending, breaking, shattering or deforming in any way.Our technology technician (Ed) demonstrates the strength of a material by performing a hand stand on a strong piece of timber (wood). It does not bend even under his weight. He has eaten pies and drunk a large amount of beer for twenty years and yet the strong material does not bend, flex or deform (change shape) in any way.ELASTICITYThe ability of a material to absorb force and flex in different directions, returning to its original position.Our technology technician demonstrates the elasticity of a material by springing up and down on a piece of steel rod. Do not try this at home as an accident may result. Ed our technician is an expert at demonstrating this property as it is his hobby.PLASTICITYThe ability of a material to be change in shape permanently.Our technology technician and his twin brother demonstrate the plasticity of a molten aluminium by pouring it into a mould. Once the aluminium has cooled down, it can be removed from the casting sand. It has a new shape.Our technician is often seen scavenging in dust bin

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