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Online Tests
Physics ECAT Pre Engineering Chapter 17 Physics of Solid Online Test MCQs With Answers
Question # 1
Polymeric solids have
Choose an answer
low specific gravity
high specific gravity
either of them
none of them
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Question # 2
The bonding between the semi-conductor materials is
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covalent
ionic
either of them
none of them
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Question # 3
Substances which break just after the elastic limit is reached, are known as
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brittle substances
ductile substances
plastic substances
elastic substances
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Question # 4
Whenever a covalent bond is broken in an intrinsic semi-conductor
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hole is created
an electron is created
an electron-hole pair is generated
all of them
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Question # 5
The SI unit of stress is
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N/m
2
Nmc
dynes/m
N
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Question # 6
When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as
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acceptor
donor
either of them
none of them
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Question # 7
When a stress changes length, it is called the
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compressional stress
tensile stress
shear stress
any one of them
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Question # 8
The substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called
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diamagnetic substances
ferromagnetic substances
paramagnetic substances
all of them
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Question # 9
In a semi-conductor material, the total current is
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only the +ve current
only the electronic current
sum of +ve and electronic current
all of them
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Question # 10
Tick the one which is not polymer solid:
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Zirconia
Polythene
Nylon
Synthetic rubber
None of these
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Question # 11
The neighbours of every molecule in crystalline solids are arranged in
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an irregular manner
a regular manner
any manner
none of them
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Question # 12
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
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Question # 13
The greatest stress that a material can endure without losing the proportionality between stress and strain is called
Choose an answer
plastic line
breaking point
proportional limit
none of them
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Question # 14
Within each domain, the magnetic field of all the spinning electrons are
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parallel
antiparallel
perpendicular
all of them
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Question # 15
The results of mechanical tests are usually expressed in terms of
Choose an answer
stress
strain
stress and strain
neither strees nor strain
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Question # 16
Amorphous solids:
Choose an answer
Have definite melting points
Are called glassy solids
Have no definite melting point
Both (B) and (C)
Both (A) and (C)
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