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Objective Questions

Latest OPSC AAE Exam Question (Objective Questions), MCQ in English

Subjects : Agricultural Processing And Food Engineering, Soil And Water Conservation Engineering

Question Bank OPSC Assistant Agriculture Engineer Paper - 2 Exam - English
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Agricultural Processing And Food Engineering

Question 1Single Answer
Engineering properties of agricultural materials are important mainly for:
  1. A
    Designing processing and handling equipment
  2. B
    Increasing rainfall
  3. C
    Changing crop variety
  4. D
    Fixing market price
Question 2Single Answer
Which is a physical property of grain?
  1. A
    Latent heat
  2. B
    Specific heat
  3. C
    Thermal conductivity
  4. D
    Bulk density
Question 3Single Answer
The mass per unit true volume of individual kernels is called:
  1. A
    Specific heat
  2. B
    Bulk density
  3. C
    Porosity
  4. D
    True density
Question 4Single Answer
Bulk density is defined as mass divided by:
  1. A
    Moisture content
  2. B
    True solid volume only
  3. C
    Surface area
  4. D
    Bulk volume including pore spaces
Question 5Single Answer
Porosity represents the fraction of bulk volume occupied by:
  1. A
    Air spaces
  2. B
    Grain solids only
  3. C
    Moisture only
  4. D
    Foreign matter
Question 6Single Answer
Porosity of grain bulk depends on:
  1. A
    Bulk and true densities
  2. B
    Specific heat only
  3. C
    Thermal conductivity only
  4. D
    Colour only
Question 7Single Answer
The geometric mean diameter of an approximately ellipsoidal grain is based on:
  1. A
    Length, width and thickness
  2. B
    Mass only
  3. C
    Density only
  4. D
    Moisture only
Question 8Single Answer
Sphericity indicates how closely a particle resembles a:
  1. A
    Sphere
  2. B
    Cylinder
  3. C
    Cone
  4. D
    Cube
Question 9Single Answer
Roundness is associated mainly with:
  1. A
    Specific heat
  2. B
    Thermal conductivity
  3. C
    Moisture content
  4. D
    Sharpness of particle corners
Question 10Single Answer
Surface area is important in designing:
  1. A
    Farm buildings only
  2. B
    Tractor transmission
  3. C
    Irrigation canals only
  4. D
    Drying and heat-transfer systems
Question 11Single Answer
Angle of repose is related to:
  1. A
    Flowability of granular material
  2. B
    Specific heat
  3. C
    Thermal diffusivity
  4. D
    Respiration rate only
Question 12Single Answer
The angle of repose generally increases when grain becomes:
  1. A
    More free flowing
  2. B
    More cohesive
  3. C
    Spherical and smooth only
  4. D
    Lighter only
Question 13Single Answer
Coefficient of friction is important in designing:
  1. A
    Refrigeration compressors only
  2. B
    Chutes and bins
  3. C
    Solar panels
  4. D
    Steam boilers only
Question 14Single Answer
Static coefficient of friction is associated with:
  1. A
    Moisture migration
  2. B
    Heat transfer
  3. C
    Aerodynamic lift only
  4. D
    Initiation of sliding
Question 15Single Answer
Rolling resistance is especially important for:
  1. A
    Spherical fruits
  2. B
    Fine powders only
  3. C
    Liquids
  4. D
    Gases
Question 16Single Answer
Terminal velocity is an important:
  1. A
    Thermal property
  2. B
    Aerodynamic property
  3. C
    Optical property only
  4. D
    Chemical property
Question 17Single Answer
Terminal velocity is used in grain cleaning by:
  1. A
    Colour sorting only
  2. B
    Magnetic separation only
  3. C
    Air separation
  4. D
    Hand grading
Question 18Single Answer
A particle reaches terminal velocity when drag force balances its effective:
  1. A
    Surface area only
  2. B
    Temperature
  3. C
    Moisture
  4. D
    Weight
Question 19Single Answer
Drag coefficient depends on particle shape and:
  1. A
    Colour
  2. B
    Specific heat
  3. C
    Vapour pressure only
  4. D
    Reynolds number
Question 20Single Answer
Smaller and lighter impurities can often be removed by:
  1. A
    Aspiration
  2. B
    Milling only
  3. C
    Parboiling
  4. D
    Evaporation
Question 21Single Answer
Specific heat is the heat required to raise unit mass by:
  1. A
    One joule per second
  2. B
    One metre
  3. C
    One pascal
  4. D
    One degree temperature
Question 22Single Answer
Thermal conductivity measures a material's ability to:
  1. A
    Resist airflow only
  2. B
    Store moisture
  3. C
    Conduct heat
  4. D
    Absorb pressure
Question 23Single Answer
Thermal diffusivity indicates the rate at which:
  1. A
    Moisture is weighed
  2. B
    Temperature changes propagate through a material
  3. C
    Grain flows through a chute
  4. D
    Seeds are separated
Question 24Single Answer
Thermal diffusivity is related to thermal conductivity, density and:
  1. A
    Angle of repose
  2. B
    Specific heat
  3. C
    Sphericity
  4. D
    Friction coefficient
Question 25Single Answer
Moisture content affects grain:
  1. A
    Variety only
  2. B
    Colour only
  3. C
    Price only
  4. D
    Physical and thermal properties
Question 26Single Answer
Fruit firmness is commonly important for:
  1. A
    Wheat milling only
  2. B
    Handling and packaging design
  3. C
    Oil extraction only
  4. D
    Grain aeration only
Question 27Single Answer
Mechanical damage of fruits is influenced by:
  1. A
    Thermal conductivity only
  2. B
    Specific heat only
  3. C
    Impact and compression properties
  4. D
    Water activity only
Question 28Single Answer
Bulk density is especially useful for calculating:
  1. A
    D-value
  2. B
    Storage-bin capacity
  3. C
    Z-value
  4. D
    Refrigerant flow only
Question 29Single Answer
True density of grains may be measured using:
  1. A
    Psychrometer
  2. B
    Screen analysis only
  3. C
    Liquid displacement method
  4. D
    Thermometer only
Question 30Single Answer
Porosity is usually expressed as:
  1. A
    Percentage
  2. B
    kg/m²
  3. C
    m/s
  4. D
    W/mK
Question 31Single Answer
A grain with high sphericity is closer in shape to a:
  1. A
    Cube
  2. B
    Flat plate
  3. C
    Needle
  4. D
    Sphere
Question 32Single Answer
The projected area of a grain is important in:
  1. A
    Evaporation only
  2. B
    Thermal death calculation only
  3. C
    Aerodynamic separation
  4. D
    Refrigeration load only
Question 33Single Answer
Coefficient of restitution describes:
  1. A
    Aerodynamic drag only
  2. B
    Grain moisture
  3. C
    Heat capacity
  4. D
    Elasticity during impact
Question 34Single Answer
A lower coefficient of restitution indicates:
  1. A
    Higher thermal conductivity
  2. B
    Perfectly elastic collision
  3. C
    No impact damage
  4. D
    Greater energy loss during impact
Question 35Single Answer
Aerodynamic separation is most effective when components differ in:
  1. A
    Temperature only
  2. B
    Colour only
  3. C
    Moisture only
  4. D
    Terminal velocity

Soil And Water Conservation Engineering

Question 36Single Answer
A fluid is a substance that:
  1. A
    Cannot deform
  2. B
    Has fixed shape
  3. C
    Deforms continuously under shear stress
  4. D
    Has zero mass
Question 37Single Answer
Density is defined as:
  1. A
    Weight per unit volume
  2. B
    Force per unit area
  3. C
    Volume per unit mass
  4. D
    Mass per unit volume
Question 38Single Answer
The SI unit of density is:
  1. A
    N/m³
  2. B
    kg/m³
  3. C
    Pa·s
  4. D
    m²/s
Question 39Single Answer
Specific weight is:
  1. A
    Weight per unit volume
  2. B
    Mass per unit volume
  3. C
    Volume per unit weight
  4. D
    Density divided by gravity
Question 40Single Answer
The SI unit of specific weight is:
  1. A
    kg/m³
  2. B
    m³/N
  3. C
    N/m²
  4. D
    N/m³
Question 41Single Answer
Specific gravity is the ratio of fluid density to the density of:
  1. A
    Water at standard reference condition
  2. B
    Air
  3. C
    Mercury
  4. D
    Oil
Question 42Single Answer
Specific gravity is:
  1. A
    Measured in pascals
  2. B
    Measured in kg/m³
  3. C
    Measured in N/m³
  4. D
    Dimensionless
Question 43Single Answer
Specific volume is defined as:
  1. A
    Mass per unit volume
  2. B
    Weight per unit volume
  3. C
    Volume per unit mass
  4. D
    Density × gravity
Question 44Single Answer
Dynamic viscosity represents a fluid's resistance to:
  1. A
    Compression
  2. B
    Evaporation
  3. C
    Buoyancy
  4. D
    Shear deformation
Question 45Single Answer
The SI unit of dynamic viscosity is:
  1. A
    N/m³
  2. B
    m²/s
  3. C
    kg/m³
  4. D
    Pa·s
Question 46Single Answer
Kinematic viscosity is equal to dynamic viscosity divided by:
  1. A
    Density
  2. B
    Pressure
  3. C
    Gravity
  4. D
    Specific weight
Question 47Single Answer
The SI unit of kinematic viscosity is:
  1. A
    N·s/m²
  2. B
    kg/m³
  3. C
    N/m²
  4. D
    m²/s
Question 48Single Answer
A Newtonian fluid obeys:
  1. A
    Pascal's law only
  2. B
    Archimedes' principle only
  3. C
    Bernoulli's equation only
  4. D
    Newton's law of viscosity
Question 49Single Answer
For a Newtonian fluid, shear stress is proportional to:
  1. A
    Pressure
  2. B
    Velocity gradient
  3. C
    Density
  4. D
    Fluid depth only
Question 50Single Answer
Which of the following is approximately Newtonian?
  1. A
    Mud
  2. B
    Toothpaste
  3. C
    Paint slurry
  4. D
    Water
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