List of practice Questions

Which among the given options truly depict the lines 1 and 2 in the figure below with respect to the effect of heat processing on food?
Homogenization of milk leads to disintegration of fat globules by
The lowest water activity ($a_w$) supporting the growth of Staphylococcus aureus in food under aerobic condition is:
Cultures used in industrial production of yogurt are:
In a dairy plant, spray drying technology is used to produce whey powder. The rate of spray drying depends on:
The parboiling of paddy results into:
One hundred kg paddy is dried from 18% wet basis to 13% wet basis moisture content. The amount of water removed (in kg) from the paddy is _________ (round off to one decimal place).
Match the following polymers to the most appropriate product
Match the polymers to the polymerization method used for their synthesis:
If 5 g of a monodisperse polystyrene sample of molecular weight 10,000 g mol$^{-1}$ is mixed with 15 g of another monodisperse polystyrene sample of molecular weight 20,000 g mol$^{-1}$, then the polydispersity of the resulting mixture is _________ (rounded off to two decimal places).
For a polymer sample with a viscosity of $6 \times 10^{11}$ poise, if the apparent plateau modulus of $3 \times 10^6$ dyne cm$^{-2}$ drops to zero above a certain temperature, the relaxation time of the polymer is _________ days (rounded off to one decimal place).
The tensile modulus of a thermosetting polyester resin and glass fiber are 3 GPa and 80 GPa, respectively. If a tensile stress of 110 MPa is applied along the fiber direction on a continuous uniaxially aligned glass fiber reinforced thermosetting polyester composite with a fiber content of 60% by volume, the resulting strain will be _________ \times 10^{-3} \text{ (round off to one decimal place).}
The amount of low molecular weight plasticizer with a $T_g$ of -60°C that must be added to nylon 6 to reduce its $T_g$ from 50°C to 30°C is _________ % (rounded off to nearest integer).
The enthalpy of fusion for a polymer is found to decrease from 135.6 J g$^{-1}$ to 120 J g$^{-1}$ after five years of use. If the enthalpy of fusion of the same polymer with 100% crystallinity is 290 J g$^{-1}$, then the loss in crystallinity after five years is _________ % (rounded off to one decimal place).
Which of the following polymers are polyesters?
The functionality of adipic acid for condensation reaction with glycerol is _________ (in integer).
From the dynamic mechanical analysis of a polymer sample with a phase angle of 30°, the relationship between storage modulus \( E' \) and loss modulus \( E'' \) can be expressed as:
Match the properties in Column A with their respective unit in Column B:
Match the following polymer product with its most appropriate processing technique
Match the following additives to their respective functions:
Match the polymers with their characteristic infrared (IR) stretching frequency.
In a rubber sample with a Mooney viscosity of 60 ML(1+4) 100°C, the number 4 signifies
The initiator system which can be used for free radical polymerization at 5°C is:
Weather resistance of high impact polystyrene can be improved by blending polystyrene with:
Which of the following is a discontinuous polymer processing operation?