Answer:
1.True- The more that you are able to prevent heat loss; the more rapidly, effectively and effortlessly you will be able to cook all kinds of food using the energy of the sun. Insulation of the cooker can help to increase your heat retention, but many people lose more heat through holes and gaps than any other way.
2. True-While solar cookers are a great solution for many developing countries, there are a few drawbacks. The very trait that makes solar cookers so beneficial -- sunlight as fuel -- also makes it problematic. Solar cooking on a broad scale is really only viable for countries that have a dry, sunny climate for at least half the year.
3.False-I am often asked about solar oven food safety. Food safety is a primary concern whether you are cooking in the kitchen or in the solar kitchen. Utmost care and caution must be used in order to prevent illness caused by improper storage, handling, and preparation of food. No one wants to be the “Potato Salad Lady”, whose potluck contribution spoiled at the picnic, causing everyone to get sick. So here are some basic guidelines to food safety.
4. False-Water does not need to be boiled to be made safe for drinking. Most microbes and pathogens will be killed at 150 ° F (65 ° C) for just five minutes. Solar radiation can purify water and make it safe to drink. Solar energy from the sun can disinfect water from lakes and rivers.
