(a) What are the default values of the primitive data type int and float?

Default value of int is 0 and float is 0.0f.

(b) Name any two OOP’s principles.

1. Encapsulation
2. Inheritance

(c) What are identifiers ?

Identifiers are symbolic names given to different parts of a program such as variables, methods, classes, objects, etc.

(d) Identify the literals listed below:

(i) 0.5 (ii) 'A' (iii) false (iv) "a"

1. Real Literal
2. Character Literal
3. Boolean Literal
4. String Literal

(e) Name the wrapper classes of char type and boolean type.

Wrapper class of char type is Character and boolean type is Boolean.