A. 10-3
B. 103
C. 10-15
D. L015
✅ The correct answer is option A.
Engineering MCQs
Pick out the wrong statement. Termination of polymerisation reaction occurs, if the
A. Catalyst supply is stopped
B. Monomer supply is exhausted
C. Impurities present in monomers interfere with the chemical reaction
D. Two ends of a chain of molecules join
✅ The correct answer is option A.
Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure.
A. 18
B. 16
C. 14
D. 12
✅ The correct answer is option B.
With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected.
A. Impact strength
B. Percent elongation
C. Hardness
D. Both B & C
✅ The correct answer is option A.
Out of the following, the materials having maximum magnetic permeability is
A. Silicon steel (Si = 4%)
B. Cast iron
C. Wrought iron
D. Mild steel
✅ The correct answer is option A.
Heating of an ore below its melting point in presence of excess of air is called
A. Calcination
B. Smelting
C. Roasting
D. Sublimation
✅ The correct answer is option C.
In __________ process, ions of salts react with water to produce acidity or alkalinity.
A. Hydration
B. Hydrolysis
C. Electrolysis
D. Dialysis
✅ The correct answer is option B.
An “orange peel” effect is observed
A. As a defect during metal casting/ welding
B. During deep drawing of metallic sheet having large grain size
C. During faulty heat treatment of steel
D. During extrusion of metal through a die
✅ The correct answer is option B.
During solid state sintering of powders, the following mechanism can be active.
A. Evaporation and condensation
B. Solid state diffusion processes
C. Liquid formation in grain boundaries
D. Creation of more dislocations
✅ The correct answer is option B.
Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.
A. Atoms
B. Neutrons
C. Nucleons
D. Electrons
✅ The correct answer is option A.