Numerical Computation and Estimation - General Aptitude - General Aptitude (GA) Previous Year Questions

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2015 · General Aptitude (GA) · General Aptitude · Numerical Computation and Estimation

Life Sciences (XL) 2015

If the decimal reduction time for spores of a certain bacterium at 121°C is 12 seconds, the time required (in minutes) to reduce 10¹⁰ spores to one spore by heating at 121°C is ______

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2

2015 · General Aptitude (GA) · General Aptitude · Numerical Computation and Estimation

Life Sciences (XL) 2015

A bacterial culture is growing using 2.0 mg/ml fructose as the sole source of carbon and energy. The bacterial biomass concentrations immediately after inoculation and at the end of the growth phase are 0.1 mg/ml and 0.9 mg/ml, respectively. Assuming complete utilization of the substrate, the bacterial growth yield (Y) on fructose is ______

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3

2015 · General Aptitude (GA) · General Aptitude · Numerical Computation and Estimation

Life Sciences (XL) 2015

An oil immersion objective of a light microscope has a numerical aperture of 1.25. Using the Abbe equation, the maximum theoretical resolving power (in nm) of the microscope with this objective and blue light (wavelength = 450 nm) is __________

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4

2015 · General Aptitude (GA) · General Aptitude · Numerical Computation and Estimation

Life Sciences (XL) 2015

Milk is flowing at 0.12 m³/min in a 2.5 cm diameter pipe. The temperature of the milk is 21 °C and the corresponding viscosity and density are 2.1 x 10⁻³ Pa·s and 1029 kg/m³, respectively. If the flow is found to be turbulent under the given conditions, the Reynolds number is __________

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5

2015 · General Aptitude (GA) · General Aptitude · Numerical Computation and Estimation

Life Sciences (XL) 2015

Whole milk (34,950 kg) containing 4% fat is to be separated in 6 h period into skim milk with 0.45% fat and cream with 45% fat. The flow rate of cream stream (kg/h) from the separator is __________

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6

2015 · General Aptitude (GA) · General Aptitude · Numerical Computation and Estimation

Life Sciences (XL) 2015

A dilute pineapple juice is heated in a double pipe heat exchanger from 28 °C to 75 °C by heat exchanging with hot water flowing in shell in counter current direction. Hot water is entering the shell at 95 °C and leaving at 85 °C. The log mean temperature difference (°C) is __________

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7

2015 · General Aptitude (GA) · General Aptitude · Numerical Computation and Estimation

Life Sciences (XL) 2015

Granulated sugar, having an average particle size of 500 μm, is milled to produce icing sugar having an average particle size of 25 μm. The power requirement was 10 kW as obtained by Rittinger’s law. If the same mill were to be used to produce fondant sugar having an average particle size of 20 μm at the same capacity, the power requirement (kW) would be __________

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8

2022 · General Aptitude (GA) · General Aptitude · Numerical Computation and Estimation

Life Sciences (XL) 2022

A forty-times diluted sample of ssRNA gave an A₂₆₀ of 0.01. The concentration of the ssRNA before the dilution in μg/mL was ____ (correct to the nearest integer).

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9

2022 · General Aptitude (GA) · General Aptitude · Numerical Computation and Estimation

Life Sciences (XL) 2022

What will be value of the Numerical Aperture (NA), if half aperture angle is 58° and oil immersed objective is used for the process of light microscopy? (Answer up to 1 decimal place)
Consider Sin 58° = 0.85 and refractive index of immersion oil used is = 1.50.

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