UPSC Foreman Chemical Paper 2018

  DGQA Foreman Chemical Paper 2018
Foreman Chemical in Directorate General of Aeronautical Quality Assurance

Consider the following materials
(1) Sand
(2) Granite
(3) Clay Brick
(4) Steel

What is the correct sequence in the increasing order of their bulk density?
(a) 1, 3, 2 and 4
(b) 3, 1, 2 and 4
(c) 1, 3, 4 and 2
(d) 3, 4, 1 and 2

Which one of the following is NOT a neutral refractory material?
(a) Carbon
(b) Bauxite
(c) Chromite
(d) Dolomite

Flint glass is also called as
(a) Soda-lime glass
(b) Potash-lime glass
(c) Potash-lead glass
(d) Borosilicate glass

Which one of the following minerals is NOT found in the sedimentary rocks?
(a) Calcite
(b) Gypsum
(c) Magnesite
(d) Feldspar

Which one of the following oils is the commonly used as vehicle of a paint?
(a) Nut oil
(b) Linseed oil
(c) Poppy oil
(d) Tung oil

Which one of the following is an example for a biodegradable plastic?
(a) Polybutadienehydroxide
(b) Chloroflurocarbon
(c) Polyhydroxyalkanoate
(d) Melamine formaldehyde

Bitumen completely dissolves in which one of the following solvents?
(a) Water
(b) Carbon monoxide
(c) carbon dioxide
(d) Carbon bisulphide

Which of the following are the properties of CNG?
(1) It ignites at a higher temperature
(2) The conversion is very easy
(3) The operating cost is much lower
(4) Combustion of this gas leads to more CO emission
(5) Emission contain no unregulated pollutants
(a) 1,2,3 and 4 only
(b) 1,3,4 and 5 only
(c) 1,2,3 and 5 only
(d) 2,3,4 and 5 only

Consider the following steps for manufacturing of coal gas
(1) The gas is scrubbed by passing through a hydraulic main
(2) Coal is carbonized in absence of air about 1300 degree C
(3) Tar and ammonia, present in the gas are removed by scrubbing with water in a scrubber
(4) Tar is removed by cooling the gas in a huge water cooled heat exchanger called condenser
(5) The gas is freed from hydrogen sulphide by passing it over moist ferric oxide, contained in a purifier
(6) The cooled gas is then scrubbed with creosote oil which dissolves benzol and naphthalene
What is the correct sequence of steps occurred?
(a) 2, 1, 4, 3, 6 and 5
(b) 1, 2, 4, 3, 5 and 6
(c) 1, 2, 3, 4, 5 and 6
(d) 2, 3, 1, 3, 6 and 5