MCQ

 

1. Which of the following option leads to the portability and security of Java?

The applet makes the Java code secure and portable

Bytecode is executed by JVM

Use of exception handling

Dynamic binding between objects

Ans:  Bytecode is executed by JVM

 

 

2. Which of the following is not OOPS concept in Java?

Inheritance

Encapsulation

Polymorphism

Compilation

Ans: Compilation

 

 

3. Which concept of Java is a way of converting real world objects in terms of class?

Polymorphism

Encapsulation

Abstraction

Inheritance

Ans:  Abstraction

 

 

4. Which component is used to compile, debug and execute java program?

JVM

JDK

JIT

JRE

Ans:JDK

 

 

5. What is use of interpreter?

They convert bytecode to machine language code

They read high level code and execute them

They are intermediated between JIT and JVM

It is a synonym for JIT

Ans:  They read high level code and execute them

 

 

6. Which of the following is a valid declaration of an object of class Box?

Box obj = new Box();

Box obj = new Box;

obj = new Box();

new Box obj;

Ans: Box obj = new Box();

 

 

7. Which of these keywords is used to make a class?

class

struct

int

none of the mentioned

Ans: class

 

 

8. What is the return type of Constructors?

int

float

void

none of the mentioned

Ans:void

 

 

9. What is true about constructor?

It can contain return type

It can take any number of parameters

It can have any non access modifiers

Constructor cannot throw an exception

Ans: It can contain return type

 

10 . What would be the output of the following code snippet if variable a=10?

if(a<=0)
{
    if(a==0)
    {
    System.out.print("1 ");
    }
    else
    {
    System.out.println("2 ");
    }

}
System.out.println("3 ");

1 2

2 3

1 3

3

Ans: 3