Java MCQ – Multiple Choice Questions and Answers – Data Types and Variables – Part 2

This collection of Java Multiple Choice Questions and Answers (MCQs): Quizzes & Practice Tests with Answer focuses on “Java data types and variables”.
 

1. In Java int, short, byte and long all of these are _________

A unsigned

B signed

C Both of the above

D None of these

Answer  

2. Which of the following is a valid declaration of a boolean?

A boolean b1 = 'true';

B boolean b2 = false;

C boolean b3 = 'false';

D boolean b4 = 1;

Answer  

3. An expression include byte, int, and numbers is moved up to which of these?

A int

B long

C byte

D float

Answer  

4. What is the default value of a variable declared boolean?

A TRUE

B FALSE

C null

D 1

Answer  

5. Which data type(s) can store 64 bit Value?

A boolean

B int

C long

D float

Answer  

6. Scope of Byte Data Type is ______.

A -128 to 128

B -127 to 127

C -127 to 128

D -128 to 127

Answer  

7. What is the output of the following code?

public class A
{
    public static void main(String args[])
    {
	   int a;
 	   a = 10;
 	   
	   if(a == 10)
	   {
		  int b = 20;
		  System.out.print("a and b: "+ a + " " + b);
		  b = a*2;
	   }
	   
	   b = 100;
	   System.out.print("a and b: " + a + " " + b);
    }
}

A 10 20 10 100

B 10 20 10 20

C 10 20 10 10

D Error

Answer  

8. float is represented with ______ and double is represented with ______.

A 32 and 64

B 64 and 64

C 32 and 32

D 64 and 32

Answer  

9. Which automatic type conversion is feasible?

A long to int

B int to long

C byte to int

D short to int

Answer  

10. What is the output of the following code?

public class Q10 
{
    static void echo(float x)
    {
        System.out.print("float");
    }

    static void echo(double x)
    {
        System.out.print("double");
    }

    public static void main(String[] args)
    {
        echo(25.5);
    }
}

A double

B float

C Compilation Error

D Exception is thrown at runtime

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