Mild steel has _______________ crystal lattice structure?
(A) Face centred cubic (fcc)
(B) Body centred cubic (bcc)
(C) Orthorhombic
(D) Cubic
Wrought iron is never shaped by__________________?
(A) Casting
(B) Cold working
(C) Forging
(D) Welding
The best guide to judge the general quality of water is the measurement of its__________________?
(A) pH value
(B) Electrical conductivity
(C) Turbidity
(D) Dissolved oxygen content
The maximum thickness of the metal which can be welded using ultrasonic welding is _____________ mm ?
(A) 0.5
(B) 3
(C) 10
(D) 25
All of the following alloying elements of steel increases hardness but sacrifice ductility, except________________?
(A) Nickel
(B) Vanadium
(C) Molybdenum
(D) Chromium
Stainless steel is welded using__________________?
(A) Oxy-acetylene flame
(B) Oxy-hydrogen flame
(C) Arc welding
(D) Inert gas arc welding
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’
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____________________?
(A) 100
(B) 900
(C) 9000
(D) 10000
Nuclear fission of one atom of uranium-235 produces the energy equivalent to about ____________ MeV?
(A) 20
(B) 200
(C) 500
(D) 2000
On being hit with a hammer, ___________________ will readily fracture?
(A) Brass
(B) Mild steel
(C) Cast iron
(D) Lead