Question # 1

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

The electrons in the outermost shell of an atom are called

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core electrons

valence electrons

high energy electrons

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

When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called

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energy bands

energy shells

states

all of them

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

The vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

Ferromagnetic substances lose their magnetism when heated above a certain temperature, known as

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critical temperature

curie temperature

high temperature

fixed temperature

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 SI unit of stress is

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N/m²

Nmc

dynes/m

N

The substances in which, atom are so oriented that their fields support each other and the atoms behave like tiny magnets, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all 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

Polymeric solids have

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low specific gravity

high specific gravity

either of them

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 SI unit of strain is

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N

Dynes

Pascal

Dimensionless

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