SECTION-1

ENGINEERING MATERIAL MCQ

 

Q51. The activation energy for grain boundary diffusion is
(a) more than the volume diffusion 
(b) equal to that of volume diffusion 
(c) lower than the volume diffusion 
(d) none of the above. 
Ans: (c) lower than the volume diffusion
 
 Q52. According to Fick’s first law of diffusion, rate of diffusion
(a) is directly proportional to the square of concentration gradient 
(b) is directly proportional to the concentration gradient 
(c) is inversely proportional to the concentration gradient 
(d) none of the above.
Ans: (b) is directly proportional to the concentration gradient

 

Q53. A phase diagram is also known as
(a) equilibrium diagram 
(b) constitutional diagram 
(c) indicator diagram 
(d) both (a) and (b) 
Ans:(d) both (a) and (b)

 

Q54. A phase diagram has
(a) Alloy composition are ordinate and temperature as its abscissa 
(b) temperature as its ordinate and alloy composition as its abscissa 
(c) temperature as its ordinate and time as its abscissa 
(d) none of the above.
Ans: (b) temperature as its ordinate and alloy composition as its abscissa

 

Q55. A solid solution consists of two kinds of atoms combined in one type of space lattice and is simply a solution in the
(a) liquid state of the two elements 
(b) solid state 
(c) either (a) or (b) 
(d) none of the above. 
Ans: (b) solid state

 

Q56. The phase diagram shows two different and distinct phases. The phases are
(a) solid solution and gas 
(b) liquid metal solution and gas 
(c) solid solution and liquid metal solution 
(d) none of the above.  
Ans: (c) solid solution and liquid metal solution

 

Q57. The Lever Rule is used to determine
(a) the chemical composition of each phase 
(b) the phases that are present 
(c) the amount of each phase at any given temperature 
(d) all of the above
Ans: (c) the amount of each phase at any given temperature

 

Q58. According to Lever-rule
(a) the relative lengths of the lever arms must balance 
(b) the amount of phase present mast balance 
(c) the relative lengths of the level arms multiplied by the amounts of the phase present must balance 
(d) none of the above.  
Ans: (c) the relative lengths of the level arms multiplied by the amounts of the phase present must balance

 

Q59. The atoms and molecules of gases
(a) have same freedom of motion as of solids 
(b) have lesser freedom of motion than those in solids 
(c) have greater freedom of motion than those in solids 
(d) none of the above. 
Ans: (c) have greater freedom of motion than those in solids

 

Q60. Heat is transmitted through solids by
(a) transfer of energy by free electrons 
(b) elastic vibrations of atoms and molecules 
(c) both (a) and (b) 
(d) none of the above.
Ans: (c) both (a) and (b)
  

 

 

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Read More Sections of Engineering Materials 

Each section contains maximum 80 Questions. To practice more questions visit other sections.
 

Engineering Material Objective Questions – Section-1

 

Engineering Material Objective Questions – Section-2

 

Engineering Material Objective Questions – Section-3

 

Engineering Material Objective Questions – Section-4

 

Engineering Material Objective Questions – Section-5
 

 


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