JUNIOR INSTRUCTOR – LABORATORY ASSISTANT – CHEMICAL PLANT – INDUSTRIAL TRAINING DEPARTMENT

PROVISIONAL ANSWER KEY
Question Paper Code: 55/2016/OL
Category Code: 012/2010
Exam: Junior Instructor Laboratory Assistant-Chemical
Plant
Medium of Question: English
Date of Test 13-06-2016
Alphacode A
Question1:-Hardness in water is caused by the presence of:
A:-sodium chloride
B:-sodium carbonate
C:-calcium chloride
D:-potassium nitrate
Correct Answer:- Option-C
Question2:-pH of acidic solution is:
A:-14
B:-7
C:-less than 7
D:-more than 7
Correct Answer:- Option-C
Question3:-Which of the following methods empolyes ion-selective membranes?
A:-sofening
B:-electrodialysis
C:-super-filtration
D:-flash evaporator
Correct Answer:- Option-B
Question4:-Coagulants help in settling of:
A:-suspended impurities only
B:-fine suspended impurities
C:-colloidal particles only
D:-both the suspended and colloidal particles.
Correct Answer:- Option-D
Question5:-Ultraviolet rays are used in water treatment for :
A:-illumination
B:-sterilization
C:-coagulation
D:-sedimentation
Correct Answer:- Option-B
Question6:-Which of following fuel gases possess the highest calorific value?
A:-water gas
B:-coal gas
C:-producer gas
D:-natural gas
Correct Answer:- Option-B
Question7:-The process of splitting of bigger hydrocarbons into smaller hydrocarbon molecules, is called:
A:-pyrolysis
B:-thermal decomposition
C:-cracking
D:-combustion
Correct Answer:- Option-C
Question8:-Analysis of flue gases is done by:
A:-Boy′s gas calorimeter
B:-Orsat apparatus
C:-retort
D:-Bomb calorimeter
Correct Answer:- Option-B
Question9:-Lignite is:
A:-lowest rank coal
B:-highest rank coal
C:-used in metallurgy of iron
D:-none of the above
Correct Answer:- Option-A
Question10:-During fermentation of molasses, the enzyme which converts glucose and fructose into alcohol is:
A:-zymase
B:-lypase
C:-invertase
D:-maltase
Correct Answer:- Option-A
Question11:-For good performance, the hydrocarbon molecules in a diesel fuel should be:
A:-branch-chained
B:-side-chained
C:-straight-chained
D:-aromatic
Correct Answer:- Option-C
Question12:-EDTA method of determining hardness of water can be used to determine:
A:-all types of hardness
B:-temporary hardness
C:-permanent hardness only
D:-alkaline hardness only
Correct Answer:- Option-A
Question13:-During reverse osmosis:
A:-Dissolved salts are pushed out through the semipermeable membrane
B:-only dissolved ionic salts are pushed out through the semipermeable membrane
C:-pure water is pushed out through semipermeable membrane.
D:-both water and dissolved salts are pushed out through the semipermeable membrane
Correct Answer:- Option-C
Question14:-Swimming for a long time in salt water makes the skin of one′s fingertips wrinkled. Which one of the following
properties is responsible for this observation?
A:-Osmosis
B:-Dialysis
C:-Electrodialysis
D:-Coagulation
Correct Answer:- Option-A
Question15:-Reflectivity of a black body is ———-
A:-0
B:-0.5
C:-0.8
D:-1.0
Correct Answer:- Option-A
Question16:-For supporting horizontal cylindrical vessels ———-supports are commonly used
A:-saddle
B:-skirt
C:-lug
D:-bracket
Correct Answer:- Option-A
Question17:-Scale formation in boilers causes :
A:-no loss of heat
B:-wastage of heat
C:-increase in efficiency
D:-none of the above
Correct Answer:- Option-B
Question18:-Multiple effect evaporation is carried out ,to ———–
A:-decreases heat losses
B:-increase capacity
C:-decrease capital cost
D:-decrease working cost
Correct Answer:- Option-D
Question19:-The calorific value of a fuel is expressed as :
A:-kcal cm
B:-kcal cm-³
C:-kcal m-³
D:-cal m-³
Correct Answer:- Option-C
Question20:-The process of vulcanisation makes rubber :
A:-soluble in water
B:-hard
C:-soft
D:-more elastic
Correct Answer:- Option-B
Question21:-Bakelite is manufactured by heating together :
A:-phenol and formaldehyde
B:-vinyl chloride and benzene
C:-phenol and acetone
D:-phenol and oxalic acid
Correct Answer:- Option-A
Question22:-A plastic which can be softened on heating hardened on cooling is called :
A:-thermoelastic
B:-thermoplastic
C:-thermosetting
D:-thermite
Correct Answer:- Option-B
Question23:-Desalination is a process of removing :
A:-oil
B:-mineral acids
C:-common salt
D:-hardness from water
Correct Answer:- Option-C
Question24:-Most popular and ideal disinfectant in water works is :
A:-bleaching powder
B:-ozone
C:-chlorine
D:-lime
Correct Answer:- Option-C
Question25:-Standard atmospheric pressure in terms of water column is :
A:-9.81m
B:-10.33m
C:-8.75m
D:-12.35m
Correct Answer:- Option-B
Question26:-Electrolytic conduction is due to :
A:-movement of the electrolyte through the external wire
B:-flow of electrons through the solution
C:-migration of ions to the oppositely charged electrodes
D:-flow of positive ions through the external wire
Correct Answer:- Option-C
Question27:-A galvenic cell converts :
A:-electrical energy into chemical energy
B:-chemical energy into electrical energy
C:-electrical energy into heat energy
D:-chemical energy into heat energy
Correct Answer:- Option-B
Question28:-Select a suitable adsorbent for the removal of phenolic contaminants from waste water
A:-active carbon
B:-silica gel
C:-molecular sieve
D:-alumina
Correct Answer:- Option-A
Question29:-The process of zinc coating over iron sheets by hot-dipping is called :
A:-galvanisation
B:-tinning
C:-sheradizing
D:-anodizing
Correct Answer:- Option-A
Question30:-Drying oils supply to paint film :
A:-main film-forming constituent
B:-medium or vehicle
C:-water-proofness
D:-all of these.
Correct Answer:- Option-D
Question31:-Butter is a colloidal sol containing :
A:-water dispersed in fat
B:-fat globules dispersed in water
C:-fat dispersed in casein
D:-suspension of casein in water
Correct Answer:- Option-A
Question32:-Tyndall effect is due to :
A:-absorption of light
B:-transmittance of light
C:-reflection of light
D:-scattering of light
Correct Answer:- Option-D
Question33:-The atomic number of an element is 9. During compound formation, it normally :
A:-gains 2 electrons
B:-loses 1 electron
C:-gains 1 electron
D:-losses 2 electrons
Correct Answer:- Option-C
Question34:-Nature of bonding in diamond is :
A:-ionic
B:-covalent
C:-coordinate
D:-metallic
Correct Answer:- Option-B
Question35:-Silicon is used in transistors as :
A:-conductor
B:-insulator
C:-semiconductor
D:-capacitor
Correct Answer:- Option-C
Question36:-Most poisonous pollutant in water is :
A:-arsenic
B:-phosphate
C:-zinc
D:-carbon dioxide
Correct Answer:- Option-A
Question37:-Bhopal gas tragedy in 1984 was caused by :
A:-carbonyl chloride
B:-carbon monoxide
C:-methyl cyanide
D:-methyl isocyanate
Correct Answer:- Option-D
Question38:-Which one of the following refractories is used in nuclear engineering as moderator?
A:-chromite bricks
B:-carborundum
C:-Beryllia bricks
D:-fire clay bricks
Correct Answer:- Option-C
Question39:-A bullet-resistant glass is obtained by:
A:-embedding a wiremesh at the centre of the glass sheet
B:-pressing together several layers of glass with vinyl resins in alternate layers
C:-using two or more plates of glass separated by 6-13mm thick gap containing dehydrated air
D:-none of the above
Correct Answer:- Option-B
Question40:-The single most important property of lubricating oil is its:
A:-fire-point
B:-cloud-point
C:-oiliness
D:-viscosity-index
Correct Answer:- Option-D
Question41:-Purest form of Iron is:
A:-steel
B:-wrought iron
C:-pig iron
D:-cast iron
Correct Answer:- Option-B
Question42:-Caprolactum is a monomer of:
A:-nylon-6
B:-Teflon
C:-PTFE
D:-Melamine
Correct Answer:- Option-A
Question43:-The emissivity of a real surface is always :
A:-greater than unity
B:-equal to unity
C:-less than unity
D:-less than or greater than unity
Correct Answer:- Option-C
Question44:-Asphalt is obtained from——-in a refinery
A:-residues
B:-intermediate distillates
C:-heavy distillates
D:-light distillates
Correct Answer:- Option-A
Question45:-An example of high explosive is :
A:-gun powder
B:-nitrocellulose
C:-TNT
D:-lead oxide
Correct Answer:- Option-C
Question46:-Identification of an organic compound can be established by using:
A:-UV spectroscopy
B:-IR spectroscopy
C:-chromatography
D:-none of the above
Correct Answer:- Option-B
Question47:-Which noise can be tolerated by human ear?
A:-20 decibels
B:-100 decibels
C:-80 decibels
D:-120 decibels
Correct Answer:- Option-C
Question48:-A fluid has no viscosity:
A:-real fluid
B:-ideal fluid
C:-Newtonian fluid
D:-Non-Newtonian fluid
Correct Answer:- Option-B
Question49:-The principle of continuity is based on
A:-law of conservation of energy
B:-law of conservation of mass
C:-law of conservation of momentum
D:-all of the above
Correct Answer:- Option-B
Question50:-The absolute pressure is equal to:
A:-gauge pressure – atmospheric pressure
B:-gauge pressure + vacuum pressure
C:-gauge pressure +atmospheric pressre
D:-Atmospheric pressure -gauge pressure
Correct Answer:- Option-C
Question51:-Which of the following is present in lemon?
A:-carbonic acid
B:-tartaric acid
C:-Oxalic acid
D:-citric acid
Correct Answer:- Option-D
Question52:-Which of the following pair have pH less than 7 ?
A:-tea and coffee
B:-gastric juice and NaOH
C:-lemon juice and lime water
D:-sodium carbonate and sodium bicarbonate
Correct Answer:- Option-A
Question53:-When blue litmus is added to dil. HCl
A:-it changes to white
B:-it remains blue
C:-it becomes red
D:-it changes to green colour
Correct Answer:- Option-C
Question54:-A gas is neither combustible nor supporter of combustion, turns most blue litmus paper red, used in cold drinks.
The gas is:
A:-CO
B:-carbon dioxide
C:-hydrogen
D:-chlorine
Correct Answer:- Option-B
Question55:-If we add phenolphthalein to dil.HCl :
A:-The solution turns pink
B:-The solution remains colourless
C:-The solution becomes green
D:-The solution becomes orange red
Correct Answer:- Option-B
Question56:-You are advised not to see the SUN directly with your eye,because the converging light will destroy the :
A:-Retina
B:-Eye-ball
C:-Eye-lens
D:-Pupil
Correct Answer:- Option-A
Question57:-“When physical condition remain the same, the electric current flowing through a conductor is
directly proportional to the potential difference”. This law is called :
A:-Ohm’s law
B:-Ampere’s law
C:-Coulomb’s law
D:-Joule’s law
Correct Answer:- Option-A
Question58:-Rheostat is used to vary:
A:-current
B:-potential difference
C:-power
D:-resistance
Correct Answer:- Option-A
Question59:-Water movement against gravity is due to :
A:-Osmosis
B:-Respiration
C:-Photosynthesis
D:-Transpiration
Correct Answer:- Option-D
Question60:-During rainy season,it is difficult to open and close doors and windows due to:
A:-Imbibition
B:-Endomosis
C:-Exomosis
D:-Diffusion
Correct Answer:- Option-A
Question61:-The odour of sulphur dioxide gas is:
A:-Pungent
B:-Odourless
C:-Sweet smelling
D:-Foul smelling
Correct Answer:- Option-A
Question62:-The problems of fluid statics are influenced by the following forces:
A:-gravity and viscous forces
B:-gravity and pressure forces
C:-viscous and surface tension forces
D:-gravity and surface tension forces
Correct Answer:- Option-B
Question63:-Mercury is generally used in manometers for measuring:
A:-low pressure accurately
B:-large pressure accurately
C:-all pressures except the smaller ones
D:-very low pressures
Correct Answer:- Option-C
Question64:-The flow in a river during the period of heavy rainfall is:
A:-steady,uniform,two-dimensional
B:-unsteady,uniform and three-dimensional
C:-unsteady,non-uniform and three-dimensional
D:-steady,non-uniform and three dimensional
Correct Answer:- Option-C
Question65:-A pitot-tube is an instrument for measuring:
A:-pressure of flow
B:-discharge of fluid
C:-velocity of flow
D:-total energy
Correct Answer:- Option-C
Question66:-The coefficient of discharge of a venturimeter lies within the limits:
A:-0.7-0.9
B:-0.6-0.8
C:-0.75-0.95
D:-0.95-0.99
Correct Answer:- Option-D
Question67:-The Reynolds experiments for determining the character of flow in pipes involved:
A:-the measurement of velocity by pitot-tube
B:-measurement of flow only
C:-observation of the condition of dye -filament which become wavy or irregular at the onset
of the turbulence.
D:-measurement of intensity of turbulence
Correct Answer:- Option-C
Question68:-The laminar flow is characterized by:
A:-irregular motion of fluid particles
B:-fluid particles moving in layers parallel to the boundary layer
C:-high Reynolds number of flow
D:-existence of eddies
Correct Answer:- Option-B
Question69:-The parameters which determines the friction factor for turbulent flow in rough pipe are:
A:-Froude number and relative roughness
B:-Froude number and Mach number
C:-Reynolds number and relative roughness
D:-Mach number and relative roughness
Correct Answer:- Option-C
Question70:-In orifice flow, the vena contracta represents:
A:-the section where the jet has maximum flow area
B:-the location where the jet area is minimum , the streamlines parallel and the pressure atmospheric
C:-the section where the pressure is above atmospheric
D:-the opening of orifice itself
Correct Answer:- Option-B
Question71:-What is the major use of carbon molecular sieve?
A:-separation of lower hydro-carbons
B:-adsorption of organics from drinking water
C:-separation of air to produce nitrogen
D:-separation of suspended impurities from air
Correct Answer:- Option-C
Question72:-Rotameter is used for measuring:
A:-density of fluids
B:-velocity of fluids in pipes
C:-viscosity of fluids
D:-discharge of fluids
Correct Answer:- Option-D
Question73:-Joule-sec is the unit of
A:-thermal conductivity
B:-kinematic viscosity
C:-universal gas constant
D:-planck′s constant
Correct Answer:- Option-D
Question74:-Why are baffles provided in heat exchangers?
A:-To reduce heat transfer rate
B:-To increase heat transfer rate
C:-To remove dirt
D:-To reduce vibration
Correct Answer:- Option-B
Question75:-Kinetic energy of a gas molecule is zero at :
A:-0°c
B:-273°c
C:-100°c
D:–273°c
Correct Answer:- Option-D
Question76:-Cavitation will takes place in case of :
A:-pelton wheel
B:-rotary pump
C:-reciprocating pump
D:-centrifugal pump
Correct Answer:- Option-D
Question77:-Fog is formed due to:
A:-humidity
B:-low pressure
C:-temperature fall of atmosphere
D:-all of the above
Correct Answer:- Option-C
Question78:-Velocity head is given by :
A:-v/g
B:-v²/2g
C:-v³/2g
D:-v²/2g²
Correct Answer:- Option-B
Question79:-Inclined single column manometer is useful in the measurement of—————–pressure.
A:-small
B:-medium
C:-high
D:-negative
Correct Answer:- Option-A
Question80:-To separate entrained liquid or solid in gas flow, we use a ———–.
A:-steam trap
B:-strainer
C:-drip leg
D:-open drain
Correct Answer:- Option-C
Question81:-One kilogram of water contains 4g of NaoH .The concentration of the solution is expressed as:
A:-0.1molal
B:-0.1molar
C:-Decinormal
D:-0.5 Normal
Correct Answer:- Option-A
Question82:-The first use of quantum theory to explain the structure of atom was made by:
A:-Heisenberg
B:-Bohr
C:-Planck
D:-Einstein
Correct Answer:- Option-B
Question83:-Which of the following relates to photon both as wave motion and as stream of particles?
A:-Interference
B:-E=mc²
C:-Diffraction
D:-E=hv
Correct Answer:- Option-D
Question84:-A larger increase in reaction rate with small rise in temperature is due to:
A:-increase in number of activated molecules
B:-increase in number of collisions
C:-lowering of activation energy
D:-shortening of mean free path
Correct Answer:- Option-A
Question85:-The function of gypsum is to:
A:-start the setting of cement
B:-stop the hydration of cement
C:-retard the easily initial setting of the cement
D:-give the colour of the cement
Correct Answer:- Option-C
Question86:-If the temperature remains constant, the volume of a given mass of gas is inversely proportional to its
pressure.this statement is known as:
A:-Boyle′s law
B:-Charle′s law
C:-Gay-Lussac law
D:-Joule′s law
Correct Answer:- Option-A
Question87:-The kinematic viscosity is the ratio of:
A:-viscosity to the density of the liquid
B:-mass to the density of the liquid
C:-viscosity to the specific weight of the liquid
D:-density to the specific weight of the liquid
Correct Answer:- Option-A
Question88:-Tooth paste shows a ———–type of flow behaviour
A:-Newtonian
B:-Ideal
C:-Bingham plastic
D:-Pseudo plastic
Correct Answer:- Option-C
Question89:-At critical speed in a ball mill:
A:-centrifugal force = gravitational force
B:-centripetal force = centrifugal force
C:-centrifugal force = pressure force
D:-centripetal force = gravitational force
Correct Answer:- Option-A
Question90:-Fractionating column is divided into two section,one is called as ————section and other is called as
———-section
A:-evaporation; condensation
B:-boiling; cooling
C:-rectifying; stripping
D:-volatile; reflux
Correct Answer:- Option-C
Question91:-The rule of material balance always deals with the equality of —————-
A:-moles in and out
B:-volumes in and out
C:-masses in and out
D:-concentrations in and out
Correct Answer:- Option-C
Question92:-The driving force for crystallization is ————————
A:-temperature difference
B:-density difference
C:-viscosity
D:-super saturation
Correct Answer:- Option-D
Question93:-Pyrometers which react to all wavelengths of incident radiant energy are known as ———pyrometers
A:-polarisng
B:-total radiation
C:-optical
D:-disappearing filament
Correct Answer:- Option-B
Question94:-The major limitation of the first law of Thermodynamics that it doesnot consider:
A:-heat as a form of energy
B:-rate of change of a process
C:-direction of change
D:-spontaneous process
Correct Answer:- Option-C
Question95:-Fourier′s law states that the rate of heat transfer per unit surface area is proportional to the
———————–gradient normal to the surface.
A:-voscosity
B:-temperature
C:-pressure
D:-velocity
Correct Answer:- Option-B
Question96:-If there is a gravitational field acting on a fluid , then at any local region of the fluid the
gravitational force per unit volume is the product of acceleration due to gravity and——-
A:-density
B:-viscosity
C:-velocity
D:-specific volume
Correct Answer:- Option-A
Question97:-The most effective heat exchanger is ————–
A:-the parallel-flow type
B:-the counter-flow type
C:-the cross-flow type
D:-all of the above
Correct Answer:- Option-C
Question98:-The ratio of the emissive power of a body to the emissive power of a black body at the same
temperature is ———to the absorptivity of the body
A:-not related
B:-not proportional
C:-lower
D:-equal
Correct Answer:- Option-D
Question99:-Force by inertia is a product of mass and:
A:-shear stress
B:-area
C:-pressure
D:-acceleration
Correct Answer:- Option-D
Question100:-Free convection arises from the————differences between the fluid in contact with a
surface and the surrounding fluid.
A:-density
B:-viscosity
C:-mass
D:-volume
Correct Answer:- Option-A