SECTION-2

 

ENGINEERING MATERIAL OBJECTIVE QUESTIONS/MCQ

 

 

Q51. The atomic packing factor in a body-centred cube is equal to
(a) 0.68 
(b) 0.74 
(c) 0.90 
(d) 1.0.
Ans: (a) 0.68
 
Q52. The atomic packing factor for hexagonal close packed structure is equal to
(a) 0.68 
(b) 0.74 
(c) 0.90 
(d) 1.0.
Ans: (b) 0.74
 
Q53. The bond, in which the atoms of different elements transfer electrons one to the other so that both have stable outer shells and at the same time become ions, one positively and other negatively charged, is known as
(a) ionic bond 
(b) metallic bond 
(c) covalent bond 
(d) none of the above. 
Ans: (a) ionic bond
 Q54. The bond, in which atoms of the same or different elements give up their valence electrons to form an electron cloud (or electron gas) throughout the space occupied by the atoms, is known as
(a) ionic bond 
(b) metallic bond 
(c) covalent bond 
(d) none of the above.
Ans: (b) metallic bond
 
Q55. The total energy E is given by
(a) \[ E=\frac{b}{m v} \]
(b) \[E=\frac{k^{2} h^{2}}{\pi^{2} m}  \]
(c) \[  E=\frac{k^{2} h^{2}}{8 k^{2} m} \]
(d) \[ E=\frac{8 \pi^{2} m}{k^{2} h^{2}} \]
Ans: (c) \[  E=\frac{k^{2} h^{2}}{8 k^{2} m} \]

 

Q56. The Brinell hardness number is given by
(a) \[  \frac{2 W}{\pi D\left(D+\sqrt{D^{2}-d^{2}}\right)} \]
(b) \[ \frac{2 W}{\pi D\left(D-\sqrt{D^{2}-d^{2}}\right)} \]
(c) \[ \frac{4 W}{\pi D^{2}} \]
(d) \[ \frac{4 W}{\pi\left(D^{2}-d^{2}\right)} \]
where W = Load on indenter in kg, D = Diameter of steel ball d = Average measured diameter of indentation in mm.
(b) \[ \frac{2 W}{\pi D\left(D-\sqrt{D^{2}-d^{2}}\right)} \]

 

Q57. Conductivity (σ) is given by
(a) \[ \sigma=\frac{R A}{L} \]
(b) \[ \sigma=\frac{L}{R A} \] 
(c) \[ \sigma=\frac{A L}{R}  \]
(d) \[  \sigma=\frac{L R}{A}  \]
(b) \[ \sigma=\frac{L}{R A} \] 

 

Q58. The wave number (k) is given by
(a) \[ k=\frac{n \pi}{\sin \theta}  \]
(b) \[  k=\frac{n \pi}{d \sin \theta} \]
(c) \[ k=\frac{d \sin \theta}{n \pi}  \]
(d) \[ k=\frac{d n \pi}{\sin \theta}  \]
(b) \[  k=\frac{n \pi}{d \sin \theta} \]

 

Q59. Diamagnetic materials are those materials for which the value of susceptibility (k) is
(a) large and positive 
(b) large and negative 
(c) small and positive 
(d) small and negative. 
Ans: (d) small and negative.
  Q60. Ferromagnetic materials are those materials for which the value of susceptibility (k) is
(a) large and positive 
(b) large and negative 
(c) small and positive 
(d) small and negative.
Ans: (a) large and positive 
 

 

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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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