1. The difference between Read and ReadLn is

ReadLn is used for reading from file.
ReadLn discards the rest of the information on the line
ReadLn reads formatted values
ReadLn is used for constants, Read is used for variables

2. What is the result of the expression "33 Mod 2"?

1.5
16
16.5
1

3. What is the result of the expression "33 Div 2"?

1.5
16
16.5
1

4. What is the result of the expression 
  "1.0 + 2.0 * 3.0 - 6.0 / 2.0"?

4.0
1.5
14
9.0