List of top Questions asked in GATE XE, GATE CS

Which among the followings is NOT an essential amino acid?
The time required for stipulated destruction of a microbial population at a given temperature is ______.
Which among the following statements is NOT correct?
Which of the following statements is NOT correct?
Calculate the efficiency in percent (rounded off to 1 decimal place) of an oil expeller which yields 37 kg oil containing 5% solid impurities from 100 kg mustard seeds. The oil content of the mustard seed is 38%.
Orange juice is packaged aseptically and stored under ambient conditions. The degradation of vitamin C in the juice occurs during storage following first-order reaction kinetics. The degradation rate constant is $5.2 \times 10^{-3}$ day$^{-1}$. The half-life of vitamin C in days is ............. (in integer).
The weight of 10 kg dried cauliflower containing 5% moisture (wet basis) after rehydration is 60 kg. If the fresh cauliflower contained 87% moisture (wet basis), calculate the coefficient of rehydration (rounded off to 2 decimal places).
Match the industrial product in Column I with the fermentative organism in Column II.
PVDF was quenched in one case and slowly cooled at 10$^\circ$C/min in another case. The crystallinity of slowly cooled PVDF = 60%. The heat of fusion of the quenched PVDF = 0.54 $\Delta H_m$ (where $\Delta H_m$ = heat of fusion of slowly cooled PVDF). Heat of fusion of 100% crystalline PVDF = 100 J/g. Find crystallinity of quenched PVDF.
Choose the correct group of fat-soluble vitamins.
The synthesis of thyroxine T4 in the human body requires .............
Density = 0.9 g/cc, melt volume = 10 cc, residence time = 100 s. Find extruder output in kg/h.
A nylon sample of 0.03 m$^2$ cross-sectional area is subjected to a creep load of 10 kN. The load is removed after a duration of 60 s. Young’s modulus and the viscosity for nylon are 1 GPa and 300 Giga Poise. The compliance of the specimen is ______ $\times 10^{-9}$ m$^2$/N.
Glass-fiber composite: 40% glass fibers ($E_f = 69$ GPa), 60% polyester resin ($E_m=3.4$ GPa). Find modulus of elasticity of composite in longitudinal direction.
Polymer 0.2 g in 100 mL benzene. Relative viscosity = 1.5. Mark–Houwink: $[\eta] = K M^a$ with $a=0.5$, $K=0.001$. Find molecular weight.
Lipase is a natural enzyme, which cleaves carboxylic ester bonds. Among the options given, identify the polymer(s) degraded by lipase.
Among the options given, which agents are used to vulcanize or cure rubbers?
Among the options given, identify the correct pair(s) of catalyst and co-catalyst that form a Ziegler–Natta catalyst.
Among the options given, which method(s) is/are used for the synthesis of atactic polystyrene?
Stress versus elongation profiles for different polymeric materials are shown in the figure. Choose the combination that best describes these profiles.
Choose the correct option that best correlates the graphs with the polymerization methods.
Among the options given, identify the correct match between the polymers and their glass transition temperatures ($T_g$).
Polymer wetting is improved by the addition of fillers with functional groups. In a typical case-study, natural-clay was modified with hydroxyl groups and compounded with Nylon 6 along with an antioxidant. The resulting composite exhibited poor mechanical properties. Which one among the options given explains this observation?
In a liquid-vapour phase change process, $\left(\dfrac{dP}{dT}\right)_{sat}$ at 100$^\circ$C for saturated water is 3750 Pa/K. If the resulting change in specific volume ($v_g - v_f$) is 1.672 m$^3$/kg, the enthalpy of vaporization ($h_{fg}$) will be $____________$ kJ/kg (in integer).
In an air-conditioning system, air enters at 20$^\circ$C and 30% relative humidity at a steady rate of 30 m$^3$/min in a humidifier and it is conditioned to 25$^\circ$C and 60% relative humidity. Assuming entire process takes place at pressure of 100 kPa, the mass flow rate of steam added to air in the humidifier is $____________$ kg/min (rounded off to three decimal places).