Question # 1

Which of the following can become a good permanent magnet

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iron

steel

both of them

none of them

Which of the following theory completely explain the three types of materials

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Bohr model of electron distribution

Rutherford atomic model

Pauli's exclusion principle

energy band theory

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

The vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

The SI unit of stress is

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N/m²

Nmc

dynes/m

N

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

The maximum stress that a material can withstand, is known as

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plastic point

elastic limit

yield point

ultimate tensile strength

The materials in which there are plenty of free electrons for electrical conduction are known as

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conductors

insulators

semi-conductors

all of them

In the stress-strain graph, stress is increased linearly with strain until a point is reached, this point is known as

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plastic limit

plastic deformation

proportional limit

elastic behaviour

Each atom in a metal crystal vibrates about a fixed point with an amplitude that:

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Decrease the rise in temprature

Is not affected by rise in temprature

Increase with rise in temprature

Both (B) and (C)

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

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

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

The force which maintain the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

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Physics ECAT Pre Engineering Chapter 17 Physics of Solid Online Test MCQs With Answers

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