Related Questions

A material is known as allotropic or polymorphic if it
A Has a fixed structure under all conditions
B Exists in several crystal forms at different temperatures
C Responds to heat treatment
D Has its atoms distributed in a random pattern
. 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
A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.
A The student of khulna University do not usually take physical exercise.
B No respondent took more than one form of exercise.
C The method of data collection was not valid.
D Some of the respondents took more than one form of exercise.
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

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