Temperature attained in soldering of metals is about ________________ °C?
(A) 150-300
(B) 400-500
(C) 650-800
(D) 1000-1100
Which of the following are considered applications of ultrasonic testing ?
(A) Determination of elastic constant
(B) Detection of defects in metal
(C) Measurement of material thickness
(D) None of the above
Most important property of steels for use in automobile bodies is the___________________?
(A) Formability
(B) Yield strength
(C) Toughness
(D) Resilience
Preheating before welding is done to____________________?
(A) Make the plate softer
(B) Burn oil & grease sticking to plate surfaces
(C) Avoid plate distortion
(D) Prevent cold cracks
The product of a commercial direct reduction process is___________________?
(A) Liquid iron
(B) Solid iron
(C) Sponge iron
(D) Iron saturated with carbon
A 2 kg object weighs 1.8 kgf on a spring balance. The value of ‘g’ at that location in m/sec2 is___________________?
(A) 8.82
(B) 9.81
(C) 10.88
(D) 0.95
The order of a chemical reaction____________________?
(A) Can be determined only experimentally
(B) Can be determined from the stoichiometry of the reaction
(C) Cannot be zero
(D) Can be fractional
With increase in temperature, the electrical conductivity of a _________________ decreases ?
(A) Semi-conductor
(B) Metal or alloy
(C) Dielectric
(D) None of these
Which of the following if present in iron ore, enhances its value ?
(A) Alumina
(B) Alkali oxide
(C) Lime & Magnesia
(D) None of these
Out of the following the refractive index is the highest for____________________?
(A) Glass
(B) Diamond
(C) Brine
(D) Kerosene