Recent questions

Which of the following polymers is/are synthesized by ring opening polymerization?Poly$\text{(lactic acid)}$Poly$\text{( $\varepsilon$-caprolactone)}$Poly$\text{(styrene)...

The propagation step of a free radical copolymerization is represented by the following possible reaction steps:$\text{P1}$: $M_{1}^{*}+M_{1} \rightarrow M_{1}^{*}, \quad...

Match the following additives to their respective functions for poly$\text{(vinyl chloride)}$ compounding.AdditiveFunctionP. Dibutyltin maleate1. LubricantQ. Epoxydized s...

Match the following properties with their respective units.PropertyUnitP. Notched Izod impact strength$1 . \mathrm{Pa} \mathrm{s}$Q. Flexural strength$2 . \mathrm{J} \mat...

Melt flow index $\text{(MFI)}$ of a polymer depends on its molecular weight $(M W)$ and melt viscosity $(\eta)$. Select the correct relation(s) from the following.$\text{...

Biaxially oriented poly$\text{(propylene)}$ exhibits high clarity because layering of the crystalline structuresdecreases the variation in refractive index across the fil...

If a given poly(ethylene) sample with specific volume, $v=1.042 \times 10^{-3} \mathrm{~m}^{3} \mathrm{~kg}^{-1}$ shows:specific volume of the crystalline fraction, $v_{c...

The glass transition temperature $\text{( $T_{g}$ )}$ of poly$\text{(2,6-dimethyl-p-phenylene oxide) (PPO)}$ is $206.8^{\circ} \mathrm{C}$ and the $T_{g}$ of poly(styrene...

A unidirectional composite is prepared using $70 \%$ by volume of epoxy matrix and $30 \%$ by volume of carbon fibre. The elastic modulus of the epoxy matrix is $3.5$ GPa...

A monodisperse polymer sample of molecular weight $10,000 \mathrm{~g} \mathrm{~mol}^{-1}$ is mixed with another monodisperse sample of the same polymer of molecular weigh...

For a polymer solution, the dependence of viscosity $(\eta)$ on shear rate $(\dot{\gamma})$ is described by the three-parameter Carreau model given by\[\eta=\eta_{0}\left...

The dilute solution viscometry data for two samples of a polymer with two different molecular weights are shown in the figure, where $\eta_{s p} / c$ has been plotted aga...

The linear viscoelastic behaviour of a polymer is described by the Kelvin-Voigt model consisting of a spring element of elastic modulus $10$ MPa in parallel with a dashpo...

Which one of the following fungi produces aflatoxins?Aspergillus nigerFusarium verticillioidesAspergillus flavusRhizopus oligosporus

Under standard conditions in animal feeding studies, the weight gained $\text{(in grams)}$ per gram of protein consumed by an animal is termed asNet Protein RatioNet Prot...

Xeropthalmia is caused due to the deficiency ofThiaminPantothenic acidVitamin AVitamin C

Which one of the following steps is used to remove phosphatides from crude oil in the refining process?NeutralizationBleachingDegummingDeodorization

The unique flavor of chocolate and cocoa is due to the formation of$5$-methyl-$2$-phenyl-$2$-hexenalCycloteneFuraneolMaltol

Which one of the following statements regarding Hazard Analysis Critical Control Point $\text{(HACCP)}$ plan is NOT correct?HACCP is a management tool for ensuring food s...

The product of cabbage fermentation by Leuconostoc mesenteroides isTempehNattoSauerkrautMiso

Which one of the following absorbents is NOT used as an ethylene absorber in active packaging of fruits and vegetables?Potassium permanganateActivated carbonCalcium hydro...

Thermal resistance constant ( $z$-value) is defined as the change in temperature required to reduce the decimal reduction time of a microorganism by _________ percent $\t...

Which one of the following statements regarding moisture sorption isotherms of a dried food is NOT correct?At a given temperature, the difference between adsorption and d...

Processing of fluid milk at $72^{\circ} \mathrm{C}$ for $15$ seconds is termed asHigh-temperature, short-time $\text{(HTST)}$ pasteurizationLow-temperature, long-time $\t...

Match the anti-nutritional factor in Column I with their corresponding activity given in Column II.Column IColumn IIP. LectinFlatulenceQ. StachyoseChelates with divalent ...

Which of the following fatty acids is/are known to increase the low density lipoprotein $\text{(LDL)}$-cholesterol?Omega-$3$ Fatty acidsTrans Fatty acidsConjugated Linole...

The addition of which of the following to high-methoxyl pectin will result in gel formation?Calcium ionsHydrogen ionsSodium ionsSugar

Which of the following steps in food processing is/are used to reduce the acrylamide formation in food products?Pretreatment using asparaginaseLowering the pHIncreasing t...

Which of the following enzymes is/are used for the production of high fructose syrup $\text{(HFS)}$ from corn starch?$\alpha$-Amylase$\beta$-AmylaseXylose isomeraseGlucoa...

Which of the following is/are typical characteristic(s) of a fungal cell?Presence of histone proteinsPresence of peptidoglycans in the cell wallPresence of chitin in the ...

Which of the following statements is/ are correct regarding food and water borne disease and the class of causative microorganisms?Legionellosis is a bacterial disease.Gi...

Which of the following statements is/ are true?Hagen-Poiseuille's law is used for calculation of molecular diffusion.Fick's law is used for calculation of energy requirem...

A $10$ kg tomato pulp is concentrated from an initial moisture content of $90 \%$ (wet weight basis) to $35 \%$ (wet weight basis). The weight of the concentrate in kg is...

The surface temperature of a hot plate is $175^{\circ} \mathrm{C}$. The ambient air temperature is 25 ${ }^{\circ} \mathrm{C}$. The rate of heat transfer per unit area in...

A tubular bowl centrifuge is used to separate an aqueous phase from an oil phase. The radii of outlets of the light and heavy liquids are set at $4.5$ cm and $4.6$ cm, re...

A westerly wind is blowing in the Northern Hemisphere. What is the direction of net mass transport in the Ekman layer?SouthwardNorthwardNorth-EastwardSouth-Westward

Which one of the following feature is NOT necessary for the formation of Indian summer monsoon?Land-sea temperature contrastEl NiñoSeasonal reversal of windsMeridional pr...

The work done by Coriolis force isdirectly proportional to velocitya function of latitudezeroalways positive except at the equator

If the isobars and isopycnals are parallel to each other, the flow is said to bebaroclinicbarotropicgeostrophicrotational