How do you switch between user accounts in a Unix/Linux

If ‘go’ is coded as ‘wk’ then what is the code for ‘let’?

In a certain code language ‘SMART’ is written as 201421921, then how ‘NOKIA’ be written in that code language?

Find the code word for ‘withdraw’?

In a code language, 'MAGNESIUM' is written as '55' and 'NITROGEN' is written as '48'. How will 'COPPER' be written in that language?

In a certain code language, 'GREAT' is written as 'HQFZU', and 'TRUMP' is written as 'UQVLQ'. How will 'CHEST' be written in that language?

What does the code “28 14 61” represent in the given code language?

In a certain code language, 'U' is coded as '9' and 'G' is coded as '49', then 'MAN' will be coded as ____ in the same code language.

Which of the following is the code of ‘action’?