What is the output of Math.ceil(5.4)+Math.ceil(4.5)?

1. 10.0
2. 11.0
3. 12.0
4. 9.0

What is the method to check whether a character is a letter or digit?

1. isDigit(char)
2. isLetterOrDigit()
3. isLetterOrDigit(char)
4. isLETTERorDIGIT(char)

The number of bytes occupied by a character array of four rows and three columns are:

1. 12
2. 24
3. 96
4. 48

Which of the following data type cannot be used with switch case construct?

1. int
2. char
3. String
4. double