How to resize photograph and signature to certain width and height in pixels and file size in KB?

This post is intended for those who are trying to submit or upload images on websites that ask for certain dimension - both in size and pixels. How to resize photograph and signature to certain width and height in pixels and file size in KB? Most online applications for government exams in India asks for scanned photograph and signature in specific pixel size and image size such as -

 Upload Scanned Images of Photograph and Signature:

    The scanned images of photograph and Signature should be in jpg/jpeg format only.
    Size of the photo image must be between 20 KB to 40 KB
    Size of the signature image must be between 20 KB to 40 KB
    Dimension of photograph image should be 3.5 cm(width) x 4.5 cm(Height) only.
    Dimension of signature image should be 3.5 cm(length) x 1.5 cm(Height) only.

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How to select your own channels on Airtel Dish TV as per TRAI rules?

There are numerous TV channels today but only a few selected channels are watched by most subscribers depending on various factors such as age, interest, gender etc. Kids would like to watch cartoons, youth may want to watch music, movies and sports. Elderly people may want to watch news, religious channels etc. With so many channels of the same kind, as subscribers we are paying even for channels we don't watch. 

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