General Studies I
If a potato is placed on a pure paper plate which is white and unprinted and put in a microwave oven, the potato heats up but the paper plate does not. This is because
|A||Potato is mainly made up of starch whereas paper is mainly made up of cellulose|
|B||Potato transmits microwaves whereas paper reflects microwaves|
|C||Potato contains water whereas paper does not contain water|
|D||Potato is a fresh organic material whereas paper is a dead organic material|
All liquids and food product are made up of molecules. These molecules have positive and negative particles, so they tend to behave like microscopic magnets. As the positive half cycle of the microwave penetrates the food, the negative particles of the molecules are attracted and attempt to align temselves with this positive field of energy.
When the water saturated paper is subjected to the microwave radiation it becomes hot.
Microwave heating is more efficient on liquid water than on fats and sugars (which have a smaller molecular dipole moment), and also more efficient than on frozen water (where the molecules are not free to rotate). Moreover, large industrial/commercial microwave ovens operating at the common large industrial-oven microwave also heat water and food perfectly well.