Common salt is produced from sea water in India generally by the __________ method.
Freeze drying
Solar evaporation
Electrolytic
None of these
Correct Answer :
B. Solar evaporation
Related Questions
__________ is the trade name assigned to a nonferrous cast alloy composed of cobalt, chromium & tungsten.
Stellite
High speed steel
Cermet
Alnico
A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is
0
0.33
0.44
0.25
The activity of pure hydrogen gas at 1000°C and 5 atm pressure
Is always less than 1
Is always greater than 1
Can be 5
Depends on the choice of the standard state
Oxide layer formed on the non-ferrous metal surface after its annealing is
Removed by acid pickling
Hammered into the surface
Removed with coarse emery cloth
Left as such to protect the surface
'Amortization' in respect of financial obligation of a company means the
Liquidation of financial obligations on instalment basis
Commitment of financial obligation on priority
Liquidation of all the obsolete equipments of the company
Modernisation of the plant equipments
In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material?
Tin
Lead
Zinc
Glass
In the diving apparatus, helium is used along with oxygen, because it is
Easily available
Not soluble in blood at high pressure
Lighter than nitrogen
Completely miscible with oxygen
Out of the following, the __________ pipe has the least corrosion resistance.
Mild steel
Copper
Cast iron
Wrought iron
__________ has the highest melting point out of the following.
Tungsten
Zirconium
Molybdenum
Tantalum
__________ rubber is generally used for making 'O' rings used for vacuum sealings.
Natural
Neoprene
Butadiene
Nitrile
Annealing of cast iron
Softens it to facilitate machining
Decreases the free carbon
Increases the strength
None of these
Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when
Strain rate is increased
Grain size is increased
Prior cold deformation is increased
Not affected by any of the above parameters
The main reducing agent in iron blast furnace is
Carbon dioxide
Carbon monoxide
Oxygen
Air
The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the
Fatigue strength
Creep strength
Resilience
Endurance limit
Magnetic permeability of iron is increased by its
Decarburising
Alloying with cobalt
Purification
Alternate heating & cooling
Pick out the wrong statement.
A ferromagnetic material becomes paramagnetic above the 'Curie temperature'
Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials
Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces
Tungsten steel and alnico are not hard magnetic materials
An oxidation process is accompanied with decrease in the
Number of electrons
Oxidation number
Number of ions
All (A), (B) & (C)
The thickness of oxide film is y at time t. If 
are the temperature dependent constants, the parabolic law of oxidation is given by
Silicon percentage in silicon steel used for electrical equipments is about
1
4.0
8
14
A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its
Aqueous tension
Saturated humidity
Vapor pressure
Absolute humidity
In connection with corrosion of metals, passivation is the process that
Intensifies deterioration
Changes the composition of the metal
Inhibits further deterioration
None of these
Faraday's law of electrolysis is related to the
Cation speed
Atomic number of the cation
Equivalent mass of the electrolyte
None of these
Which of the following gases cause global warming?
Carbon monoxide
Carbon dioxide
Nitrogen
Ozone
Young's modulus of a material is the measure of its
Stiffness
Malleability
Creep resistance
Tensile strength
Colour comparator is used to measure the
pH value
Electrode potential
Colour intensity
None of these
Starting friction is low in case of the __________ lubrication.
Boundary
Hydrodynamic
Hydrostatic
Mixed/semi-fluid
The product of a commercial direct reduction process is
Liquid iron
Solid iron
Sponge iron
Iron saturated with carbon
Between 230 and 370°C, blue brittleness is caused in mild steel because of the
Immobility of dislocation
Strain-ageing
Increase in Young's modulus
Strain hardening
The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the
Resilience
Toughness
Ductility
Impact strength
Enzymes belong to the category of
Proteins
Carbohydrates
Vitamins
Fats