New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    Which is not true about

    microwave? 
    A Microwave is a radiowave Correct Answer Incorrect Answer
    B Frequency ranging from 300 MHz to 300 GHz Correct Answer Incorrect Answer
    C Wavelength ranges from 1 mm to around 30 cm Correct Answer Incorrect Answer
    D It is used in food cooking Correct Answer Incorrect Answer

    Solution

    1. Electromagnetic spectrum: a. Radio waves: >30cm b. Microwaves: 1mm-30cm c. Infrared: 700nm-1mm 2. Food applications: a. 2.45 GHz (12.24cm wavelength) b. Dielectric heating of water molecules 3. FSSAI approved for: a. Thawing b. Cooking c. Sterilization

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