10+ SA VISA CENTRAL Interview Questions and Answers

Nutrition refers to the process of providing or obtaining the food necessary for health and growth. Plants require 17 essential nutrients for proper growth and development.

• Nutrition is the process of providing or obtaining the food necessary for health and growth

• Plants require 17 essential nutrients for proper growth and development

• These nutrients include macronutrients like nitrogen, phosphorus, and potassium, as well as micronutrients like iron, zinc, and manganese

To prepare molar NaOH solution, dissolve the required amount of NaOH in distilled water and adjust the volume to the desired concentration.

• Calculate the required amount of NaOH using the formula: mass = molarity x volume x molecular weight

• Weigh the calculated amount of NaOH using a balance

• Dissolve the NaOH in distilled water in a volumetric flask

• Add distilled water to the flask to reach the desired volume

• Mix the solution thoroughly to ensure homogeneity

Insecticides are chemicals used to kill or control insects. Here are five technical names of commonly used insecticides.

• 1. Imidacloprid - a systemic insecticide used to control sucking insects on crops.

• 2. Permethrin - a broad-spectrum insecticide used to control a wide range of pests.

• 3. Chlorpyrifos - an organophosphate insecticide used to control insects in agriculture and public health.

• 4. Cypermethrin - a synthetic pyrethroid insecticide used for pest control in agriculture...read more

MSDS is a document that provides information on the hazards of chemicals and safety requirements.

• MSDS stands for Material Safety Data Sheet

• It contains information on the physical and chemical properties of a substance

• It also includes information on the potential hazards and safety precautions

• Other safety requirements include proper labeling, personal protective equipment, and emergency procedures

• Employers are required to provide MSDS to employees who work with hazardous chemi...read more

Star/Delta starter is used to reduce the starting current of a motor.

• Star connection provides high starting torque but high starting current

• Delta connection provides low starting torque but low starting current

• Star/Delta starter uses both connections to reduce starting current and provide sufficient starting torque

• Used for large motors to prevent damage to motor and electrical system

Reflux ratio is the ratio of the liquid reflux to the distillate produced in a distillation column.

• It is an important parameter in distillation processes.

• It determines the efficiency of the distillation column.

• A higher reflux ratio results in a higher purity of the distillate.

• Reflux ratio can be adjusted by changing the amount of reflux liquid or the distillate flow rate.

• It is calculated as the ratio of the reflux liquid flow rate to the distillate flow rate.

Normality refers to the state of being normal or typical.

• Normality is a statistical concept used to describe the distribution of data.

• It is often represented by a bell-shaped curve, with the majority of data falling within one standard deviation of the mean.

• Normality is important in quality control and process improvement, as deviations from normality can indicate problems in a system.

• In chemistry, normality refers to the concentration of a solution, measured in equivalents p...read more

Pesticides technical names vary depending on the specific pesticide. They are usually complex chemical names.

• Pesticides technical names are typically complex chemical names

• Examples of pesticides technical names include Glyphosate, Chlorpyrifos, Imidacloprid, and Malathion

• Each pesticide has a unique technical name that reflects its chemical composition and structure

Crop cultivation practices involve various techniques and methods to grow crops efficiently.

• Crop rotation is a common practice to maintain soil fertility and prevent pest buildup.

• Using cover crops can help improve soil health and prevent erosion.

• Proper irrigation techniques ensure crops receive adequate water without wastage.

• Integrated pest management involves using natural predators to control pests instead of chemicals.

• Regular soil testing helps determine nutrient levels an...read more

Pro b Aqua is suitable for weekly once application.

• Pro b Aqua is a highly effective probiotic solution that can be applied once a week to maintain healthy aquatic environments.

• It contains beneficial bacteria that break down organic waste and reduce harmful ammonia and nitrite levels.

• Pro b Aqua also helps to improve water clarity and reduce unpleasant odors.

• Regular use of Pro b Aqua can help to prevent common problems such as algae blooms and fish stress.

• It is easy to use and ...read more

pH is a measure of the acidity or basicity of a solution.

• pH stands for 'potential of hydrogen'

• It is measured on a scale of 0-14

• A pH of 7 is neutral, below 7 is acidic, and above 7 is basic

• pH is important in many industries, including agriculture, medicine, and manufacturing

CV calculation of control valve involves determining the valve's flow coefficient.

• CV is calculated using the formula: CV = Q / (SG * sqrt(dP))

• Q is the flow rate, SG is the specific gravity of the fluid, and dP is the pressure drop across the valve.

• CV is used to select the appropriate valve size for a given application.

• Factors such as valve type, trim size, and pressure drop affect the CV value.

• CV calculation is important for ensuring proper control of fluid flow in industrial...read more

Some common rice pests are brown planthopper, stem borer, and leaf folder. Common rice diseases include blast, sheath blight, and bacterial leaf blight.

• Brown planthopper sucks sap from rice plants, causing yellowing and stunted growth.

• Stem borer larvae bore into rice stems, causing wilting and reduced yield.

• Leaf folder larvae fold rice leaves and feed on the tissue inside, causing white streaks and reduced yield.

• Blast is a fungal disease that causes lesions on rice leaves, st...read more

The current company process involves following specific steps and procedures to ensure efficient production.

• The current company process includes detailed production schedules for each department.

• There are regular quality control checks throughout the production process.

• Employees are trained on the specific procedures and protocols to follow.

• Any deviations from the standard process are documented and reviewed for improvement.

• Continuous communication and collaboration between d...read more

The formula for sulphuric acid is H2SO4.

• Sulphuric acid is a strong mineral acid.

• Its chemical formula consists of two hydrogen atoms, one sulphur atom, and four oxygen atoms.

• It is commonly used in various industrial processes, such as in the production of fertilizers and batteries.