Question # 1

The curie temperature of iron is about

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250°C

500°C

750°C

1000°C

The bonding between the semi-conductor materials is

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covalent

ionic

either of them

none of them

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all materials

a given material

all of them

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

Any superconductor with critical temperature above 77 K, is referred as

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low temperature superconductor

high temperature superconductor

very low temperature superconductor

none of them

The greatest stress that a material can endure without losing the proportionality between stress and strain is called

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plastic line

breaking point

proportional limit

none of them

Each atom in metal crystal:

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Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about center of a crystal

None of these

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

The amplitude of oscillation of each atom in a metallic crystal rises with the

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rise in temperature

decrease in temperature

even temperature remains constant

all of them

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structure are

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5

7

9

14

The band above the valence band is called

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high energy band

conduction band

empty band

none of them

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

The domains are of macroscopic size of the order of

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centimeters

meters

millimeters

nanomneters

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ECAT Physics Chapter 17 Physics of Solids Online Test MCQs With Answers

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