A few DAC and ADC questions

Came across these on a website, no answers though..

Guess it would be benificial to everyone if we can answer these!

1. What are the factors you consider for the selection of ADC ?
3. How do you determine the number of bits of ADC is required for you ?
4. Which factor determines the number of iterations in SAR done to approximate the input voltage ?
5. What are the 2 methods of ADC interface ?
8. How do you select the particular channel of a ADC .
11. What is sampling rate/frequency ?
13. What is sample and hold ?
15. What is aliasing ?
16. What is Nyquist-Shannon theorem ?
17. Is it good to sample at a rate that is higher than that of Nyquist Frequency ?
18. What is quantization error and when does it occur ? What is the unit of measurement of it ?
20. Which type of ADC implementation is good or should be chosen, if we need lot of channels ?

You can find answers in all MCU datasheets for your most of the questions you raised here.