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Engineering :: Engineering Materials

291.  Which of the following is the major constituent of corundum?
A. Carbon B. Diamond
C. SiO2 D. MgCl2
E. Al2O3    
292.  Which of the following alloy does not contain tin?
A. Gun metal B. Phosphor bronze
C. Fusible plug material D. White metal
E. All of the above    
293.  Lead is used for joining pipes made of
A. Cold iron steel B. Cast iron
C. Concrete D. Asbestos cement
E. Vitrified clay    
294.  What is the atomic or ionic characteristic that determines the elements of which the atom or iron is representative?
A. The number of protons B. The number of neutrons
C. The nuber of electrons D. The mass
295.  Which of the following factor has the least effect on the electrical conductivity of wires made of copper alloy?
A. Method of forming the wire B. Temperature
C. Alloying element D. Intensity of any incident light
296.  The atomic number of a certain element is 83. An atom of this element must contain
A. 42 protons and 41 electrons B. 83 neutrous
C. 1 neutron, 41 electrons and 41 protons D. 83 electrons
E. None of the above is valid    
297.  The graphite rods in a nuclear pile
A. Convert fast moving neutrons into thermal neutrons B. Furnish alpha particles
C. Furnish alpha beta particles D. Furnish neutron to fission U235
E. Undergo combustion which triggers the fission reaction    
298.  If the major quantium number of an atom is three, it possesses
A. Only s and p electrons B. Only s electrons
C. Only s, p and d electrons D. Only p electrons
E. None of the above is true    
299.  All of the following are examples of ceramic materials EXCEPT:
A. Bakelite B. Aluminium oxide
C. Magnesium oxide D. Glass
300.  The specific gravity of cast iron is closer to
A. 3 B. 5
C. 7 D. 9
E. 11    

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