A) To generate electricity B) To purify water using sunlight C) To cool water in hot climates D) To heat water for showers
A) Aluminum foil B) Cardboard C) Wood D) Glass or clear plastic sheeting
A) To heat the contaminated water B) To provide structural support C) To block sunlight D) To collect the condensed water
A) Silver B) White C) Black D) Clear
A) Electrical energy B) Mechanical energy C) Solar energy D) Chemical energy
A) Filtration B) Reverse osmosis C) Evaporation and condensation D) Chemical reaction
A) Deionized water B) Clean drinking water C) Contaminated or brackish water D) Distilled water
A) To allow for ventilation B) To attract more sunlight C) To prevent water vapor from escaping D) To reduce condensation
A) Any angle is sufficient B) Perpendicular to the sun's rays C) Parallel to the ground D) At a 45-degree angle
A) Use a magnifying glass to focus sunlight B) No precautions are necessary C) Handle with care to avoid breakage D) Wear sunscreen
A) Using cold water B) A smaller surface area for evaporation C) Using reflective materials inside the still D) A larger surface area for evaporation
A) Dark-colored plastic or metal B) Mirrored surface C) Clear glass D) White cloth
A) Reduced reliance on fossil fuels for water purification B) Increased carbon emissions C) Depletion of water resources D) Land degradation
A) 1-3 liters per square meter B) Less than 0.1 liter per square meter C) 50-100 liters per square meter D) 10-20 liters per square meter
A) To collect more water B) To maintain transparency and sunlight penetration C) To increase humidity inside the still D) To prevent algae growth
A) Cold and cloudy climates B) Polar climates C) Sunny and warm climates D) Humid and rainy climates
A) Viruses B) Radioactive isotopes C) Dissolved gases D) Salts, bacteria, and heavy metals
A) Reflects sunlight away from the still. B) Provides structural support to the still. C) Traps heat inside the still. D) Facilitates the flow of condensed water to the collection trough.
A) A transparent cover B) A basin C) A water pump D) A collection trough
A) To prevent algae growth B) To absorb more solar radiation and heat up the water faster C) To reflect sunlight and keep the water cool D) To make the still more aesthetically pleasing
A) By chemically treating the water B) By boiling the water and collecting the steam C) By filtering the water through a membrane D) By evaporating the water and leaving the contaminants behind
A) Annual lubrication of moving parts B) Daily draining and refilling of the basin C) Regular cleaning and occasional replacement of the transparent cover D) No maintenance is required
A) To allow for temperature regulation B) To prevent the buildup of pressure C) To prevent water vapor from escaping and reduce condensation efficiency D) Ventilation is always necessary for optimal performance.
A) Size has no impact on output B) Smaller solar stills are always more efficient C) Larger stills are less efficient due to heat loss D) Larger solar stills generally produce more purified water
A) Lower ambient temperatures are always preferable B) Higher ambient temperatures generally increase the rate of evaporation C) Higher temperatures always damage the components. D) Ambient temperature has no effect on performance
A) Relatively low output compared to other water purification methods B) Risk of explosion C) High operating costs D) Complex construction requirements
A) The sun's strength B) The water level shouldn't be too high, as this can reduce the surface area available for evaporation. C) The size of the water container D) The air temperature
A) To prevent recontamination B) To improve its taste C) To reduce its temperature D) To increase its purity further
A) A level surface B) Proximity to a water source C) Access to direct sunlight D) Protection from wind
A) Plastic sheeting is always cheaper than glass. B) Plastic sheeting is more transparent than glass. C) Plastic sheeting is a better insulator than glass. D) Plastic sheeting is generally more durable and less prone to breakage. |