Description : Very low pressure is expressed in microns (μ), which is equal to__________ mm of Hg column (absolute) at 0°C. (A) 0.0001 (B) 0.001 (C) 0.01 (D) 0.1
Last Answer : (B) 0.001
Description : Thermocouple is suitable for measuring (A) Liquid temperatures only (B) Very high temperatures only (C) Very low temperatures only (D) Both high and low temperatures
Last Answer : (D) Both high and low temperatures
Description : The time constant of a first order process with resistance R and capacitance C is (A) R + C (B) R - C (C) RC (D) 1/RC
Last Answer : (C) RC
Description : The frequency at which maximum amplitude ratio is attained is called the __________ frequency. (A) Corner (B) Resonant (C) Cross-over (D) Natural
Last Answer : (B) Resonant
Description : A bolometer is (A) Used for the measurement of thermal radiation (B) An element which senses optical input and delivers thermal output (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : Bode diagram is a plot of (A) log (AR) vs. log (f) and (φ) vs. log (f) (B) log (AR) vs. f and log φ vs. f (C) AR vs. log (f) and φ vs. log (f) (D) None of these
Last Answer : (A) log (AR) vs. log (f) and (φ) vs. log (f)
Description : A control system has the following transfer function F(s) = [(s - 1)(s + 1)]/[s (s - 2)(s + 4)] The initial value of the corresponding time function is (A) 1 (B) 1/8 (C) 7/8 (D) -1
Last Answer : (A) 1
Description : The transfer function of a process is 1/(16s 2 + 8s + 4). If a step change isintroduced into the system, then the response will be (A) Under damped (B) Critically damped (C) Over damped (D) None of these
Last Answer : (A) Under damped
Description : An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall". This is the working principle of a (A) pH meter (B) Polarimeter (C) Chromatograph (D) Polarograph
Last Answer : (A) pH meter
Description : __________ temperature scale assigns 0° to the 'ice point' and 80° to the 'steam point'. (A) Celsius (B) Rankine (C) Reaumur (D) Fahrenheit
Last Answer : (C) Reaumur
Description : Which of the following thermocouples is incapable of measuring subzero (i.e., < 0°C) temperature? (A) Chromel-alumel (B) Iron-constantan (C) Platinum-platinum + rhodium (D) Copper-constantan
Last Answer : (C) Platinum-platinum + rhodium
Description : When a bare thermocouple is covered by a protective sheath, the response becomes (A) Faster and oscillatory (B) Faster and non-oscillatory (C) Slower and oscillatory (D) Slower and non-oscillatory
Last Answer : (D) Slower and non-oscillatory
Description : Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature. (A) Nylon (B) Polyacrylonitrile (C) Polypropylene (D) Polyester
Last Answer : (B) Polyacrylonitrile
Description : Phenol formaldehyde (A) Employs addition polymerisation (B) Employs condensation polymerisation (C) Is a monomer
Last Answer : (B) Employs condensation polymerisation
Description : Styrene which is a monomer for the production of polystyrene, is commercially produced by the (A) Catalytic dehydrogenation of ethyl benzene (B) Dehydration of ethyl alcohol followed by hydrogenation (C) Reacting ethylene oxide with acetaldehyde (D) Fermentation of starch
Last Answer : (A) Catalytic dehydrogenation of ethyl benzene
Description : Which of the following is not a condensation polymer? (A) Bakelite (B) Melamine polymer (C) Poly-methyl-methacrylate (PMMA) (D) None of these
Last Answer : (C) Poly-methyl-methacrylate (PMMA)
Description : __________ polythene is most prone to stress-cracking (A) High density (B) Low density (C) Cross-linked (D) Linear low density
Last Answer : (A) High density
Description : Thermocol is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten (A) Saturated polyester (B) Polyurethane (C) Polystyrene (D) Either (B) or (C)
Last Answer : (D) Either (B) or (C)
Description : Polymers are (A) Micro-molecules (B) Macromolecules (C) Sub-micromolecules
Last Answer : (B) Macromolecules
Description : In nylon-6, the number 6 represents the total number of (A) Carbon atoms in the ring (B) Carbon atoms in the linear polymer chain (C) Nitrogen atoms in the ring (D) Hydrogen atoms in the ring
Last Answer : (B) Carbon atoms in the linear polymer chain
Description : Thermosetting materials (A) Are cross-linked molecules (B) Soften on application of heat (C) Are solvent soluble (D) None of these
Last Answer : (A) Are cross-linked molecules
Description : The process involved in converting rubber into a thin sheet or coating it on fabric is called (A) Extrusion (B) Mastication (C) Calendaring (D) Vulcanisation
Last Answer : (C) Calendaring
Description : Which of the following is not an elastomer? (A) Polyisoprene (B) Neoprene (C) Nitrile-butadiene (D) None of these
Last Answer : (D) None of these
Description : Styrene butadiene rubber (SBR) is never used for making (A) Coated fabrics (B) Front wheel tyres of aeroplanes (i.e., heavy duty tyres)
Last Answer : (B) Front wheel tyres of aeroplanes (i.e., heavy duty tyres)
Description : Softening point of high density polythene is about __________ °C. (A) 85 (B) 135 (C) 165 (D) 205
Last Answer : (B) 135
Description : Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but (A) Polyacrylonitrile (B) Polyamide (C) Saturated polyester (D) Alkyd resin
Last Answer : (A) Polyacrylonitrile
Description : __________ is not a condensation polymer. (A) Teflon (B) Nylon-66 (C) Dacron (D) Polystyrene
Last Answer : (A) Teflon
Description : __________ is normally used for the manufacture of refrigerator components and transistor parts. (A) Polypropylene (B) Polystyrene (C) Polyester (D) Polyurethane
Last Answer : (B) Polystyrene
Description : Pick out the wrong statement. (A) Polymers made of only one monomer is called homopolymer (B) Polymers made of more than one monomer is called copolymer or mixed polymer (C) Vulcanised rubber is more elastic than natural rubber
Last Answer : (A) Polymers made of only one monomer is called homopolyme
Description : Which of the following rubbers has the widest service temperature range (-75 to 275°C)? (A) Butyl rubber (B) Silicon rubber (C) Nitrile rubber (D) Silicone rubber
Last Answer : (D) Silicone rubber
Description : Styrene butadiene rubber is commercially manufactured by (A) Bulk polymerisation (B) Suspension polymerisation (C) Solution polymerisation (D) Emulsion polymerisation
Last Answer : (D) Emulsion polymerisation
Description : In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of (A) Cross linked polystyrene (B) Phenol formaldehyde resins (C) Polyesters (D) Polyamides
Last Answer : (A) Cross linked polystyrene
Description : Adipic acid is an intermediate in the manufacture of (A) Perspex (B) Nylon-66 (C) Polystyrene (D) Bakelite
Last Answer : (B) Nylon-66
Description : Unbreakable crockeries are made from __________ polymers. (A) Polystyrene (B) Melamine (C) Polystyrene (D) Polyurethane
Last Answer : (B) Melamine
Description : Nylon-6 is a (A) Polyamide (B) Thermosetting resin (C) Polyester (D) None of these
Last Answer : (A) Polyamide
Description : Nylon-66 compared to nylon-6 has (A) Lower melting point (B) More abrasion resistant properties (C) Higher hardness (D) All (A), (B) and (C)
Last Answer : (C) Higher hardness
Description : Plexiglass (also called Lucite) because of its high optical transparency is used for making lenses. It is chemically (A) Polymethyl methacrylate (PMMA) (B) Polytetrafluroethylene (PTFE) (C) Polycarbonates (D) Phenolic resins
Last Answer : (A) Polymethyl methacrylate (PMMA)
Description : Cross linked polymers are (A) Thermoplastic (B) Thermosetting (C) Either (A) or (B) (D) Fibres only
Last Answer : (B) Thermosetting
Description : Rexine (also called artificial leather), which is used for making table cover, automobile seat cover, shoes etc. is made by coating thick cloth with molten (A) Teflon (B) Bakelite (C) SBR (D) PVC
Last Answer : (D) PVC
Description : Thermoplastic materials (A) Do not soften on application of heat (B) Are heavily branched molecules (C) Are solvent insoluble (D) None of these
Description : Commercial production of polypropylene employs __________ polymerisation. (A) Emulsion (B) Suspension (C) Solution (D) Bulk
Last Answer : (C) Solution
Description : Polyhexamethylene adipamide is also known as (A) Bakelite (B) Nylon-66 (C) Epoxy resin (D) Silicone rubber
Description : Nylon-66 is a polyamide of (A) Hexamethylene diamine and adipic acid (B) Adipic acid and methyl amine (C) Vinyl chloride and formaldehyde (D) None of these
Last Answer : (A) Hexamethylene diamine and adipic acid
Description : Size range of polymer molecules varies from __________ metre. (A) 10 -2 to 10 -5 (B) 10 -4 to 10 -7 (C) 10 -1 to 10 -2 (D) 10 -8 to 10
Last Answer : (A) 10 -2 to 10
Description : The only natural thermoplastic resin, which is a product of animal life is (A) Rosin (B) Shellac (C) Amber (D) Copal
Last Answer : (B) Shellac
Description : Which of the following is a copolymer? (A) Polystyrene (B) SBR (C) PTFE (D) Polypropylene
Last Answer : (B) SBR
Description : The starting material used for the manufacture of caprolactam is (A) Ethyl benzene (B) Cyclohexane (C) Ethylene glycol (D) DMT
Last Answer : (B) Cyclohexane
Description : Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is (A) Nylon-66 (B) Teflon (C) Polyester (D) Bakelite
Last Answer : (B) Teflon
Description : Rayon is a __________ fibre. (A) Cellulosic (B) Polyamide (C) Polyester (D) Natural
Last Answer : (A) Cellulosic
Description : Gutta percha rubber is (A) Soft & tacky at room temperature (B) An isomer of natural rubber (C) A thermosetting resin (D) Recovered by coagulation of rubber latex
Last Answer : (B) An isomer of natural rubber