Environmental Control in Structures MCQs

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1. : The main purpose of environmental control in farm structures is to?
(A) Increase construction cost
(B) Maintain comfort and productivity of animals and crops
(C) Decorate the buildings
(D) Reduce building life

2. : The comfortable temperature range for dairy cattle is?
(A) 0–10°C
(B) 13–18°C
(C) 25–30°C
(D) 35–40°C

3. : The process of removing stale air and supplying fresh air in structures is called?
(A) Insulation
(B) Ventilation
(C) Evaporation
(D) Illumination

4. : The minimum air changes per hour required in animal housing structures is about?
(A) 2–4
(B) 8–10
(C) 15–20
(D) 25–30

5. : Ridge ventilation in animal houses is provided to?
(A) Prevent sunlight
(B) Remove hot and moist air
(C) Strengthen the roof
(D) Reduce roof slope

6. : The relative humidity range considered comfortable for poultry is?
(A) 20–30%
(B) 40–60%
(C) 70–80%
(D) 90–100%

7. : The measure of resistance offered by a material to heat flow is called?
(A) Thermal conductivity
(B) Thermal resistance (R-value)
(C) Heat capacity
(D) Specific heat

8. : Whitewashing the roof of farm buildings helps in?
(A) Increasing heat absorption
(B) Reducing heat gain by reflection
(C) Pest control
(D) Strengthening the walls

9. : The most effective method for cooling air in hot and dry climates is?
(A) Refrigeration
(B) Evaporative cooling
(C) Heating
(D) Insulation

10. : The temperature-humidity index (THI) is used to evaluate?
(A) Structural stability
(B) Animal heat stress
(C) Grain storage capacity
(D) Lighting efficiency

11. : In naturally ventilated animal houses, the side walls are usually kept at?
(A) Full height without openings
(B) Partially open with wire mesh
(C) Glass panels
(D) Airtight design

12. : Insulating material used in cold storage buildings is generally?
(A) Glass
(B) Polystyrene foam
(C) Concrete
(D) Steel

13. : The best roof color for hot climates to reduce heat absorption is?
(A) Black
(B) White
(C) Dark green
(D) Red

14. : Mechanical ventilation in farm buildings is provided using?
(A) Fans and blowers
(B) Plastic sheets
(C) Wooden beams
(D) Metal rods

15. : The comfortable light intensity for dairy cattle housing is about?
(A) 5–10 lux
(B) 20–50 lux
(C) 100–150 lux
(D) 300 lux

16. : Which of the following gases must be monitored in animal housing for environmental control?
(A) Oxygen and Carbon dioxide
(B) Ammonia and Hydrogen sulfide
(C) Methane
(D) All of the above

17. : The best orientation of poultry houses for maximum natural ventilation is?
(A) North–South
(B) East–West
(C) Circular
(D) Random

18. : In a cold climate, animal housing structures should have?
(A) Thick insulated walls
(B) Open walls
(C) Metal sheets without insulation
(D) Transparent roofs

19. : The heat produced by animals inside a structure is called?
(A) Conductive heat
(B) Latent heat
(C) Metabolic heat
(D) Convective heat

20. : The ventilation system in which fans force fresh air inside and remove stale air is called?
(A) Natural ventilation
(B) Positive pressure ventilation
(C) Negative pressure ventilation
(D) Hybrid ventilation

21. : A psychrometer is used to measure?
(A) Air temperature and humidity
(B) Air velocity
(C) Gas concentration
(D) Heat load

22. : The average air velocity inside an animal house for comfort should not exceed?
(A) 0.1 m/s
(B) 0.5 m/s
(C) 1.0 m/s
(D) 2.0 m/s

23. : The main reason for ammonia accumulation in animal houses is?
(A) Grain storage
(B) Decomposition of animal urine and feces
(C) Heating systems
(D) Concrete flooring

24. : Which of the following is a renewable method of cooling farm structures?
(A) Solar-powered fans
(B) Evaporative cooling pads
(C) Roof sprinklers
(D) All of the above

25. : The ultimate goal of environmental control in structures is to?
(A) Increase heat stress
(B) Ensure optimum temperature, humidity, and ventilation for health and productivity
(C) Increase building decoration
(D) Reduce ventilation