Physics MCQs

Page No. 54

Any alteration produced in shapes length or volume when a body is subjected to some external force is called____________________?


aStiffness


bToughness


cExtension


dDeformation


View Answer Deformation

A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________?


a(F1+F2) (121+122)


b(F1+F2) (122-112)


c(F1+F2) (12-11)


d(F1+F2) (12-11)


View Answer (F1+F2) (12-11)

Materials that undergo plastic deformation before breaking are called __________________?


aBrittle


bDuctile


cAmorphous


dPolymers


View Answer Ductile

A wire suspended vertically from one end is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. How much energy is gained by the wire ?


a0.01J


b0.02J


c0.04J


d1.0J


View Answer 0.01J

With increase in temperature the electrical conductivity of intrinsic semi conductor___________________?


aDecreases


bIncreases


cRemains same


d First increases then decreases


View Answer Increases

Which one has the greatest energy gap ?


aSemi conductor


b Conductor


cMetals


dNon metals


View Answer Non metals

A certain stress applied to an elastic material produces a certain strain in it. If the elastic limit is not exceeded the energy gained per unit volume of the material is given by_________________?


aStress/strain


b(stress/strain)


cStress x strain


d(Stress / strain)


View Answer (Stress / strain)

If the density of atoms remain same along any direction in a crystal is called__________________?


aSymmetry


b Homogeneity


cIsotropy


d Cleavage


View Answer Homogeneity

The angular position of cells remains the same for a sample of a crystal. This property is called___________________?


aIsotropy


bCleavage


cHomogeneity


dThe external symmetry of form



Materials in which valence electrons are tightly bound to their atoms at low temperature are called___________________?


aSemi conductor


bSuper conductors


cInsulators


dConductor


View Answer Insulators

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