Related Questions

A material is said to be allotropic, if it has
A Fixed structure at all temperatures
B Atoms distributed in random pattern
C Different crystal structures at different temperatures
D Any one of the above
. Diamond is an allotropic form of
A germanium
B carbon
C silicon
D sulphur
For the allotropic forms of iron, the points of arrest are
A The points where no further change occurs
B Constant for all metals
C The points where there is no further flow of metal
D The points of discontinuity
Which of the following represents the allotropic forms of iron?
A Alpha iron, beta iron and gamma iron
B Alpha iron and beta iron
C Body centered cubic iron and face centered cubic iron
D Alpha iron, gamma from and delta iron
Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of
A Fusion
B Vaporisation
C Transition
D None of these
Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of
A Sublimation
B Fusion
C Transition
D Vaporisation
The most stable allotropic form of phosphorous is the __________ phosphorous.
A White
B Black
C Yellow
D Red
The most reactive allotropic form of phosphorus is __________ phosphorus.
A Red
B Yellow
C Violet
D Black
The instruction state that Sumi may need 4/9 square yards of one type of material and 2/3 square yards of another type of material for a project. She buys exactly that amount. After finishing the project, however, she has 8/18 square yards left that she did not use. What is the total amount of square yards of material Sumi used?
A 1/12
B 1/9
C 2/3
D 10/9
An orthotropic material is a special class of anisotropic material, which is described by their properties in three perpendicular directions. An example of orthotropic material is
A Stainless steel
B Cast iron
C Wood
D Teflon

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