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

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bToughness

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cExtension

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dDeformation

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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)

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b(F1+F2) (122-112)

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c(F1+F2) (12-11)

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d(F1+F2) (12-11)

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

Materials that undergo plastic deformation before breaking are called __________________?


aBrittle

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bDuctile

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cAmorphous

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dPolymers

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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

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b0.02J

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c0.04J

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d1.0J

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View Answer 0.01J

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


aDecreases

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bIncreases

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cRemains same

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d First increases then decreases

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View Answer Increases

Which one has the greatest energy gap ?


aSemi conductor

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b Conductor

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cMetals

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dNon metals

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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

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b(stress/strain)

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cStress x strain

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d(Stress / strain)

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View Answer (Stress / strain)

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


aSymmetry

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b Homogeneity

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cIsotropy

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d Cleavage

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View Answer Homogeneity

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


aIsotropy

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bCleavage

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cHomogeneity

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dThe external symmetry of form

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


aSemi conductor

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bSuper conductors

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cInsulators

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dConductor

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View Answer Insulators

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