Q1. All of the following alloying elements of steel increases hardness but sacrifice ductility, except
Q2. Reduction in the grain size reduces the __________ of the material.
(A) Fatigue resistance
(B) Tensile strength
(C) Creep resistance
(D) All (A), (B) & (C)
Q3. Stainless steel is welded using
(A) Oxy-acetylene flame
(B) Oxy-hydrogen flame
(C) Arc welding
(D) Inert gas arc welding
Q4. Wrought iron is never shaped by
(B) Cold working
Q5. Fibre glass is a composite material of
(A) Glass fibre in a polymer matrix
(B) Glass fibre in a metallic matrix
(C) Polymer fibre in a glassy matrix
(D) Both ‘b’ & ‘c’
Q6. Mild steel has __________ crystal lattice structure.
(A) Face centred cubic (fcc)
(B) Body centred cubic (bcc)
Q7. Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.
Q8. Diffusion co-efficient of a metal in a solid solution depends upon its
(C) Both (A) & (B)
(D) Neither (A) nor (B)
Q9. One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W. m-1 . k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is
Q10. The following type of bonding is strongly directional in solids.
(A) Vander Waal’s