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le. Feel ree to add new questions. Just add a new challenge, and include a "question", the "
According to ______, all objects radiate energy, no matter what their temperature happens to be.
Stefan – Boltzmann LawPascal’s Law
Huygens’ Principle
Boltzmann Law
ho is called the !ather o! modern science precisely because he initiated the comparison between theory and e"per
Plato
Aristotle
Galileo #ocrates
How many million tons o! hydrogen are con$erted into helium e$ery second at the sun%
&'' million tons
('' million tons
)'' million tons
700 million tons
hat is the unit o! radiation which ta*es into account its biological e!!ects%
millirem
millisem
siemens
hertz
hat is the e"pression o! the magnitude and direction o! the lattice distortion associated with dislocation%
+ector graph
Line $ector
+ector iagram
Burgers Vector
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-t states that two images are just resoluable when the center o! di!!raction dis* o! one is directly o$er the !irst mini
elay criteria
ayleigh criterion
Radio Criterion
/one o! the abo$e
Stokes Theorem
0radient 1heorem
+ector 1heorem
/one o! the abo$e
2ast -rons that contains &.34 2 is *nown as ____. utectic cast iron
5utectiod cast iron
5utectic cast iron
5utectiod cast iron
At temperature abo$e ________, iron is li6uid !orm
738( deg 2
87' deg 2 !"#0 deg C
9): deg 2
steel
Cast iron
alpha;!errite
graphite
______ is use to nulli!y the e!!ect harm!ul e!!ect o! sulphur in steel and is added during deo"idation
4 carbon are *nown as ______
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$anganese
Phosphorus
1he intermetallic compound iron carbide is called ________
Austenite Cementite
!errite
pearlite
#teels which contain less than '.:42 are *nown as __________
%&'oeutectiod Steel
Hypereutectiod #teel
Hypereutectic #teel Hypoeutectic #teel
2ast iron that contains more than &.342 is *nown as ________
%&'oeutectiod Cast (ron
Hypereutectiod 2ast -ron
Hypereutectic 2ast
Hypoeutectic 2ast -ron
_____ raises the elastic limit and ultimate strength o! the steel without reducing the ductility
Phosphorus
#ul!ur
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1he trans!ormation product o! austenite at low temperature is *nown as _______
Any steel heated to a particular temperature abo$e the critical temperature results in the !ormation o! ______
2ementite
)ustenite
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1he purpose o! _____ is to re!ine the grain structure and decrease the residual stress to impro$e the machinability.
1o eliminate=reduce residual stresses, steel is subjected to ________ annealing
1he !irst stage in the heat remo$al during 6uenching is ____
___ is the process by which the carbon content o! the steel is increased
Hardening
?uenching
Annealing
+ormalising
+ecrstalliation
herodising
Stress relief
Full
1he purpose o! ____ annealing is to impro$e ductility, remo$e internal stress, enhance magnetic and electrical properties and re!ine grain structure
ecrystallization
#tress relie!
#pherodising
,ull
Va'our -lanket stage
+apour transport stage
Li6uid cooling stage
+apour cooling stage
Hardening is always !ollowed by _____ in order relie$e the residual stresses an impro$e the ductility andtoughness o! the hardened steel
Heat treatment
Annealing
Tem'ering
Hardening
2arbonitriding
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1he condition o! e6uilibrium o! a body will remain unchanged i! a !orce acting at a gi$en point o! the rigid body is 1or6ue
Transmissi-ilit&
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Sta-le uili-rium
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A single 6uantum o! $ibrational or elastic energy.
'honon
Photon
6uar*s
leptons
1he time;dependent permanent de!ormation that occurs under stressJ !or most materials it is important only at ele$a
Cree'
ren*el de!ect
Plastic de!ormation
Point de!ect
-n mechanical $ibration, what do you call the ma"imum displacement o! the body !rom its e6uilibrium position a$e
Gscillation
)m'litude
istance
-n 5ngineering 5conomy, what do you call the method o! repaying a debt, the principal and interest included, usuall
)mortization
epreciation
Annuity
e!lation
hich among the crystal system has the least symmetry due to its une6ual unit cell dimensions and angles%
Biclinic
?uadclinic
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-t is a time;dependent elastic beha$ior o! materials.
)nelastic
-nelastic
Plastic /on;elastic
-t is a de$ice used to measure amount o! elongation.
5longonometer
Longatometer
Tachometer
Extensometer
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answer" and 4 otions. a #oding! --$
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