Related Questions

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
. Diamond is an allotropic form of
A germanium
B carbon
C silicon
D sulphur
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
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
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
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
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
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
A $${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months
B It will completely disintegrate in two months
C It will completely disintegrate in four months
D $${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months
In which form is the supplied heat energy stored during change in temperature of substance?
A Heat energy
B Kinetic energy
C Potential energy
D Both kinetic and potential energy

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