Type of glass used in optical work is the __________ glass.
Soda-lime
Fibre
Lead
Borosilicate
Correct Answer :
C. Lead
Related Questions
Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?
High cost of mercury
High specific gravity of mercury
Non-availability of high purity mercury
Pollution of water stream by mercury
The purpose of tanning in leather industry is to
Stiffen the leather
Smoothen the leather
Make it flexible
Impart water resistance
Catalytic oxidation of naphthalene produces
Styrene
Phenol
Phthalic anhydride
None of these
Lindane is
Not a fumigant
BHC (Benzene Hexachloride) containing 99% γ-isomer
A by-product of BHC manufacture
Both (B) and (C)
Fusel oil is a/an
Essential oil
Extract from medicinal herbs
Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).
None of these
Massecuite is a terminology used in the __________ industry.
Paint
Oil hydrogenation
Soap
Sugar
In industrial nomenclature, alcohol means
Butyl alcohol
Propyl alcohol
Ethanol
Methyl alcohol
A mineral is termed as 'ore', if
A metal can be economically extracted from it
It contains ≥ 40% metal
The metal present in it is costly
All (A), (B) and (C)
The process used for the manufacture of ethyl alcohol from molasses is
Distillation
Dehydration
Dehydrogenation
None of these
Riboflavin is a/an
Vitamin
Analgesic drug
Anaesthetics
Anti-malarial drug
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its
Poor oxidation stability and high gum forming tendency
Greater tendency of decomposition at elevated temperature
Hydrolysis tendency in presence of water
All (A), (B) and (C)
Chloramines are used in water treatment for
Disinfection and control of taste & odour
Corrosion control
Removing turbidity
Control of bacteria
Inversion of sucrose produces
Fructose
Glucose
Both (A) & (B)
Neither (A) nor (B)
Commercially ethylene is produced from naphtha by
Catalytic cracking
Catalytic dehydrogenation
Pyrolysis
Hydrocracking
Highly porous refractory bricks are
Less susceptible to chemical attack by molten fluxes and gases etc
Very strong
Having very high thermal conductivity
None of these
Calgon used in water treatment is chemically
Sodium phosphate
Sodium hexametaphosphate
Calcium phosphate
Tricresyl phosphate
Catalyst used in the oxidation of benzene to produce Maleic anhydride is
V2O5
Pt
Ni
Cr
Lubricating greases are a mixture of
Mineral oil, soap and additives
Mineral oil and metallic soap
Mineral oil and fatty oil
Fatty oil and metallic soap
In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 2SO3), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by
Increasing the oxygen concentration
Putting more quantity of V2O5 catalyst in the converter
Removing some quantity of SO3 during intermediate stage
Maintaining low temperature & pressure in the converter
Unsaturated oils compared to saturated oils have
Lower melting point & higher reactivity to oxygen
Higher melting point & higher reactivity to oxygen
Lower melting point & lower reactivity to oxygen
Higher melting point & lower reactivity to oxygen
Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of
Nitric acid
Sulphuric acid
Ammonium sulphate
Hydrochloric acid
A 'unit process' is exemplified by the
Distillation
Hydrogenation of oils
Absorption
Humidification
In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because
SO3 gas is sparingly soluble in water
Water forms an acid mist, which is difficult to absorb
The purity of acid is affected
Scale formation in the absorber is to be avoided
Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement?
Xanthates
Stearic acid
Calcium & aluminium stearate
Formic acid
Reaction of ethylene glycol and dimethyl terephthalate (DMT) produces
Nylon-6
Dacron
Polyester
PVC
Phenol formaldehyde
Employs addition polymerisation
Employs condensation polymerisation
Is a monomer
Is an abrasive material
Liquor poisoning generally occurs due to the presence of __________ in it.
Ethyl alcohol
Impurities
Methyl alcohol
Carbonic acid
Pick out the wrong statement.
Strongly caking coal should not be used in the Lurgi gasifier
Acetylene gas cannot be used for illumination purpose
Water gas is called blue gas because of the color of the flame, when it is burnt
Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels
Chemical formula of 'salt cake' is
Na2SO4
CaSO4
MgSO4
BaSO4
Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because
Its calorific value is very less
Tar neutralises the residual acids present in pitch
It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop
All (A), (B) and (C)