Chemical Engineering Mcqs

A polymer is termed as an ‘elastomer’, if its percentage elongation is more than 100%. An elastomer is termed as ‘rubber’ if its percentage elongation is more than _______________ percent ?

(A) 150
(B) 200
(C) 300
(D) 400

Submitted By :Ali Uppal

The units of the rate constant for a second order reaction are__________________?

(A) Sec-1. mole°
(B) Moles1. sec-1
(C) Moles-1. sec1
(D) Moles1. sec1

Submitted By :Ali Uppal

Between 230 and 370°C, blue brittleness is caused in mild steel because of the_________________?

(A) Immobility of dislocation
(B) Strain-ageing
(C) Increase in Young’s modulus
(D) Strain hardening

Submitted By :Ali Uppal

Principal alloying element in Elinvar (used for making hair springs for watches) is__________________?

(A) Copper
(B) Aluminium
(C) Nickel
(D) Zinc

Submitted By :Ali Uppal

Neutrons are present in all atoms except that of ___________________?

(A) He
(B) C
(C) H
(D) Ar

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An atom bomb works on the principle of __________________?

(A) Nuclear fission
(B) Nuclear fusion
(C) Both the nuclear fission & fusion
(D) Ionisation

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A psychrometer does not measure the __________________ temperature of moist air?

(A) Dew point
(B) Dry bulb
(C) Wet bulb
(D) None of these

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With increase in ___________________ Knocking tendency in a spark ignition petrol engine decreases?

(A) Supercharging
(B) Wall temperature
(C) Compression ratio
(D) Engine speed

Submitted By :Ali Uppal

Case hardening is not done by________________?

(A) Nitriding
(B) Hot dipping
(C) Electroplating
(D) Both ‘B’ & ‘C’

Submitted By :Ali Uppal

Oxide layer formed on the non-ferrous metal surface after its annealing is__________________?

(A) Removed by acid pickling
(B) Hammered into the surface
(C) Removed with coarse emery cloth
(D) Left as such to protect the surface

Submitted By :Ali Uppal

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