Java Quiz: Test Your GK! Trivia

10 Questions | By Teachmeidea.cont | Updated: Mar 22, 2022 | Attempts: 997

Questions

Settings

Create your own Quiz

Questions and Answers

1.

What of the following is the default value of an instance variable?
- A.
  
  Null
- B.
  
  0
- C.
  
  Depends upon the type of variable
- D.
  
  Not assigned
2.

What is the size of the float variable?
- A.
  
  8 bit
- B.
  
  16 bit
- C.
  
  32 bit
- D.
  
  64 bit
3.

What is the default value of the String variable?
- A.
  
  ''
- B.
  
  ""
- C.
  
  Null
- D.
  
  Not defined
4.

Which of the following is true about public access modifier?
- A.
  
  Variables, methods and constructors which are declared public can be accessed by any class.
- B.
  
  Variables, methods and constructors which are declared public can be accessed by any class lying in same package.
- C.
  
  Variables, methods and constructors which are declared public in the superclass can be accessed only by its child class.
- D.
  
  None of the above.
5.

What is Abstraction?
- A.
  
  Abstraction is a technique to define different methods of same type.
- B.
  
  Abstraction is the ability of an object to take on many forms.
- C.
  
  It refers to the ability to make a class abstract in OOP.
- D.
  
  None of the above.
6.

What is an applet?
- A.
  
  An applet is a Java program that runs in a Web browser.
- B.
  
  Applet is a standalone java program.
- C.
  
  Applet is a tool.
- D.
  
  Applet is a run time environment.
7.

What is NullPointerException?
- A.
  
  A NullPointerException is thrown when calling the instance method of a null object or modifying/accessing field of a null object.
- B.
  
  A NullPointerException is thrown when object is set as null.
- C.
  
  A NullPointerException is thrown when object property is set as null.
- D.
  
  None of the above.
8.

What happens when the thread's yield() method is called?
- A.
  
  Thread returns to the ready state.
- B.
  
  Thread returns to the waiting state.
- C.
  
  Thread starts running.
- D.
  
  None of the above.
9.

Is it necessary that each try block must be followed by a final block?
- A.
  
  True
- B.
  
  False
10.

Which of the following is a marker interface?
- A.
  
  Serializable
- B.
  
  Comparable
- C.
  
  Cloneable
- D.
  
  None of the above. Show Answer