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In the following question find out the missing number?

If CAT is coded as 3120, what code number can be given to NAVIN? 

The question below is based on the given diagram. The diagram shows three figures each representing scientists, Government employees and employees of Company X.

Which of the following represents all such Scientists who are Government employees but are not employed in Company X?

If Ram runs less fast than Shyam and Shyam runs as fast as Lal but less fast than Tom. Who runs fastest? 

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Kanna is taller than Malik. Dev is shorter than Krish where as Krish is taller than Malik. Veena is shorter than Krish but taller than Malik and Dev is taller than Veena. Who is the Shortest ? 

The following equation is incorrect. Which two signs should be interchanged to correct the equation?
12 + 10 - 28 ÷ 7 x 4 = 48