Practice Pakistan's most useful MCQs for competitive exams

How many primitive data types are there in Java ?

• (A)  5
• (B)  6
• (C)  7
• (D)  8

Answer

Submitted By :Ali Uppal

Program which executes applet is known as________________?

• (A)  JVM
• (B)  virtual machine
• (C)  applet engine
• (D)  None of above

Answer

Submitted By :Ali Uppal

What will be output of following program? public class Test{public static void main(String[] args){byte b=127; b++; b++; System.out.println(b); } } ?

• (A)  127
• (B)  -127
• (C)  129
• (D)  -129

Answer

Submitted By :Ali Uppal

Size of float and double in Java is________________?

• (A)  32 and 64
• (B)  64 and 64
• (C)  32 and 32
• (D)  64 and 32

Answer

Submitted By :Ali Uppal

Automatic type conversion in Java takes place when________________?

• (A)  Two type are compatible and size of destination type is equal of source type.
• (B)  Two type are compatible and size of destination type is larger than source type.
• (C)  Two type are compatible and size of destination type is shorter than source type.
• (D)  All of the above

Answer

Submitted By :Ali Uppal

Interfaces helps in which type of inheritance ?

• (A)  Multiple inheritance
• (B)  Multilevel inheritance
• (C)  Hierarchical inheritance
• (D)  None of above

Answer

Submitted By :Ali Uppal

Super is the predefined_______________?

• (A)  Method
• (B)  Keyword
• (C)  Keyword and Method
• (D)  None of above

Answer

Submitted By :Ali Uppal

Which of the following statements about arrays is syntactically wrong ?

• (A)  arrayName[] p = new arrayName[5];
• (B)  arrayName p[][] = new arrayName[2][];
• (C)  arrayName[] p [];
• (D)  arrayName p[5];

Answer

Submitted By :Ali Uppal

The following program: public class Test{ static boolean is OK; public static void main(String args[]){System.out.print(is OK); } } ?

• (A)  Prints true
• (B)  Prints false
• (C)  Will not compile as boolean is not initialized
• (D)  Will not compile as boolean can never be static

Answer

Submitted By :Ali Uppal

Smallest individual unit in java program is known as____________________?

• (A)  token
• (B)  string
• (C)  literal
• (D)  operator

Answer

Submitted By :Ali Uppal