Physics MCQs

Page No. 55

A ferromagnet will become fully magnetized at_________________?


aHigh voltage A.C


bLow voltage A.C


cAlternating current at its peak value


dD.C current at peak value



The energy band occupied by the valence electrons is called___________________?


a Energy state


bValence band


cve energy state


dconduction band


View Answer Valence band

Formation of large molecule by joining small molecules is_________________?


aFusion


bPolymerization


cCrystallization


dSubtraction


View Answer Polymerization

A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________?


aThe extension of the wire is proportional to the force applied


bThe weight of the wire is negligible


cThe wire is not stretched beyond its elastic limit


dThe cross sectional area of the wire remains constant



The ration stress to strain in youngs modulus of the material then tension is__________________?


aDirectly proportional to extension


bDirectly proportional to strain


cDirectly proportional to square of amplitude


dInversely proportional to extension



When a force is applied at one end of an elastic wire it produces at strain ∝ in the wire. If y is the youngs modulus of the material of the wire the amount of energy stored per unit volume of the wire is given by_________________?


aY∝


b2Y∝


cY∝/2


dY∝2


View Answer Y∝2

A wire of length L is stretched by a length E when a force F is applied at one end. If the elastic limit is not exceeded the amount of energy stored in the wire is_________________?


aFE


b(FE)


cFE2/L


dFE2


View Answer (FE)

Which one of the following physical quantities does not have the dimensions of force per unit area ?


aStress


bStrain


c Youngs modulus


dPressure


View Answer Strain

What are the dimensions of stress ?


aMLT-2


bML-2T-1


cML-1T-2


dML-T-1


View Answer ML-1T-2

Which of the following substances posses the highest elasticity ?


a Rubber


bSteel


cGlass


dCopper


View Answer Steel

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