Explore topic-wise MCQs in Technology.

This section includes 40 Mcqs, each offering curated multiple-choice questions to sharpen your Technology knowledge and support exam preparation. Choose a topic below to get started.

1.

X implements Y extends Z

A. X can be class Y,Z are interfaces
B. X is an interface Y,Z are classes
C. X,Y are classes Z is an interface
D. Complilation error
Answer» E.
Discussion
2.

X implements Y, Z_x005F_x000D_ Arguments:_x005F_x000D_ 1. X should be class2. Y, Z should be interfaces

A. Only 1 is true
B. Only 2 is true
C. Both 1 and 2 are true
D. None
Answer» D. None
Discussion
3.

Which of the following statements about inheritance is false?

A. Inheritance allows you to minimize the amount of duplicate code in an application by sharing common code among several subclasses.
B. A subclass inherits all the members (fields, methods, and nested classes) from its superclass.
C. Through inheritance, a parent class is a more specialized form of the child class.
D. Inheritance allows you to reuse the fields and methods of the super class without having to write them yourself.
Answer» D. Inheritance allows you to reuse the fields and methods of the super class without having to write them yourself.
Discussion
4.

Which of the following statements are equal for a variable declared in the interface ?_x005F_x000D_ 1. int X=102. public int X=103. public static final int X=10

A. Only 1 and 2 are equal
B. Only 2 and 3 are equal
C. All are unequal
D. All are equal
Answer» E.
Discussion
5.

Which of these class have only one field 'TYPE' ?

A. Run time
B. Process
C. Void
D. System
Answer» D. System
Discussion
6.

Which of the following modifiers can be used with Local inner class?

A. Final or Abstract
B. Final or Transcient
C. Abstract or Transcient
D. Final or public
Answer» B. Final or Transcient
Discussion
7.

Which of the following method declarations are allowed inside interface?

A. public void m1()
B. private void m1()
C. protected void m1()
D. abstract public void m1()
Answer» E.
Discussion
8.

Which of the following is not the other name of attriibute?

A. Data member
B. Instance variable
C. instance
D. Data filed
Answer» D. Data filed
Discussion
9.

Which of the following is not used for commenting in java?

A. //
B. /* */
C. /** */
D. /** **/
Answer» E.
Discussion
10.

Which of the following attribute can hold the JavaScript version?

A. script
B. version
C. language
D. none of the above
Answer» D. none of the above
Discussion
11.

Which of the following best describes JavaScript?

A. a scripting language precompiled in the browser.
B. an object-oriented scripting language
C. a low-level programming language.
D. a compiled scripting language.
Answer» C. a low-level programming language.
Discussion
12.

Which of the following are incorrect form of StringBuffer class constructor  ?

A. StringBuffer(int size , String str)
B. StringBuffer(int size)
C. StringBuffer(String str)
D. StringBuffer()
Answer» B. StringBuffer(int size)
Discussion
13.

Which of the following are valied?

A. A class can extend any number of classes simulteneously
B. A class can implement only one interface at a time
C. A class can extend other class or can implement interface but not both simulteneously
D. None of the above
Answer» E.
Discussion
14.

Which of the following are capabilities of functions in JavaScript?

A. Accept parameters
B. Return a value
C. Accept parameters and Return a value
D. None of the above
Answer» B. Return a value
Discussion
15.

Which method names follow the JavaBeans standard?

A. addSize
B. putDimensions
C. getCust
D. deleteRep
Answer» D. deleteRep
Discussion
16.

Which key word is to be used to tell the JVM to skip the variable while performing the serialization process of the object containing it?

A. Transcient
B. Volatile
C. Static
D. Final
Answer» B. Volatile
Discussion
17.

Which king class properly represents the relationship "King has a best friend who is a Soldier"?

A. class King extends Soldier { }
B. class King implements Soldier { }
C. class King { private BestFriend Soldier; }
D. class King { private Soldier bestFriend; }
Answer» E.
Discussion
18.

Which kind of inheritance is not supported directly through classes in java?

A. Multilevel
B. Multiple
C. Single
D. Hirarcheal
Answer» C. Single
Discussion
19.

Which among the following is a scope resolution operator?

A. :
B. ::
C. :?
D. None
Answer» C. :?
Discussion
20.

What is the output of this program ?_x005F_x000D_ class main_arguments {            public static void main(String [ ] args)             {                String [][] argument = new String[2][2];                int x;                argument[0] = args;                x = argument[0].length;                for (int y = 0; y < x; y++)                     System.out.print(" " + argument[0][y]);                        }        }

A. 1 1
B. 1 0
C. 1 0 3
D. 1 2 3
Answer» E.
Discussion
21.

try { int x = Integer.parseInt("two"); }_x005F_x000D_ Which could be used to create an appropriate catch block?

A. ClassCastException
B. IllegalStateException
C. NumberFormatException
D. None
Answer» D. None
Discussion
22.

There is one default constructor in every class.

A. The above statement is true
B. The above statement is false
C. Both true and false
D. None
Answer» B. The above statement is false
Discussion
23.

The keyword which indicates that a method can be accessed by only one thread at a time is

A. Strictfp
B. Synchronized
C. New
D. None
Answer» C. New
Discussion
24.

public class Threads2 implements Runnable {_x005F_x000D_ public void run() {_x005F_x000D_ System.out.println("run.");_x005F_x000D_ throw new RuntimeException("Problem");_x005F_x000D_ Which among the following is true?_x005F_x000D_ }_x005F_x000D_ public static void main(String[] args) {_x005F_x000D_ Thread t = new Thread(new Threads2());_x005F_x000D_ t.start();_x005F_x000D_ System.out.println("End of method.");_x005F_x000D_ }_x005F_x000D_ }

A. java.lang.RuntimeException: Problem
B. run. java.lang.RuntimeException: Problem
C. End of method. java.lang.RuntimeException: Problem
D. End of method. run. java.lang.RuntimeException: Problem
Answer» E.
Discussion
25.

Keeping the actoins and attributes together under a single unit is called

A. Encapsulation
B. Information Hiding
C. Polymorphism
D. Inheritance
Answer» B. Information Hiding
Discussion
26.

public abstract class Shape {_x005F_x000D_ private int x;_x005F_x000D_ private int y;_x005F_x000D_ public abstract void draw();_x005F_x000D_ public void setAnchor(int x, int y) {_x005F_x000D_ this.x = x;_x005F_x000D_ this.y = y;_x005F_x000D_ }_x005F_x000D_ }_x005F_x000D_ Which two classes use the Shape class correctly?

A. public class Circle implements Shape { private int radius;
B. public abstract class Circle extends Shape { private int radius; }
C. public class Circle extends Shape { private int radius; public void draw();
D. None
Answer» C. public class Circle extends Shape { private int radius; public void draw();
Discussion
27.

main() {_x005F_x000D_ int i;_x005F_x000D_ printf("%d",scanf("%d",&i)); // value 10 is given as input here_x005F_x000D_ }

A. 1
B. 2
C. 3
D. 4
Answer» B. 2
Discussion
28.

Javascript is interpreted by

A. Server
B. Object
C. Client
D. None of the above
Answer» D. None of the above
Discussion
29.

In RDBMS, what is the efficient data structure used in the internal storage representation?

A. Stack
B. Queue
C. B+ tree structure
D. AVL tree Structure
Answer» D. AVL tree Structure
Discussion
30.

Inside an interface when should the variables be initialized?

A. Globally
B. Whenever required
C. Inside a function
D. During the time of declaration
Answer» E.
Discussion
31.

In a single virtual machine, the Java programming language passes arguments by

A. Refference
B. Value
C. Both A and B
D. None
Answer» C. Both A and B
Discussion
32.

How many of the following will follow JavaBean Listener naming rules?_x005F_x000D_ addListener_x005F_x000D_ addMouseListener_x005F_x000D_ deleteMouseListener_x005F_x000D_ removeMouseListener_x005F_x000D_ registerMouseListener_x005F_x000D_

A. 1
B. 2
C. 3
D. 4
Answer» C. 3
Discussion
33.

How many constructors can a class have?

A. 1
B. 2
C. 4
D. None of the above
Answer» E.
Discussion
34.

Convert the expression ((A + B) * C – (D – E) ^ (F + G)) to equivalent  Postfix notations.

A. AC + B * DE - FG +^-
B. AB + C * DE - FG + ^-
C. AC + B* DE - FG -+ ^
D. AB + C * DE - FG -+ ^
Answer» C. AC + B* DE - FG -+ ^
Discussion
35.

Client code having direct access to internal data is called

A. Encapsulation
B. DataHiding
C. Polymorphism
D. DataAbstraction
Answer» C. Polymorphism
Discussion
36.

By whom will the unallocated memory that is no longer needed will be cleared in java?

A. Java Virtual Machine
B. Garebage collector
C. Both A and B
D. None
Answer» C. Both A and B
Discussion
37.

An algorithm written once which can be used in many places is called

A. Block
B. Function
C. Datatype
D. None
Answer» C. Datatype
Discussion
38.

A lock can be acquired on a class._x005F_x000D_ The above statement is

A. 1
B.
C. Both A and B
D. None
Answer» B.
Discussion
39.

What is the string contained in s after following lines of code?_x005F_x000D_ StringBuffer s = new StringBuffer(“Hello”); s.deleteCharAt(0);  ?

A. llo
B. Hllo
C. ello
D. H
Answer» D. H
Discussion
40.

void waitForSignal() {_x005F_x000D_ Object obj = new Object();_x005F_x000D_ synchronized (Thread.currentThread()) {_x005F_x000D_ obj.wait();_x005F_x000D_ obj.notify();_x005F_x000D_ }_x005F_x000D_ }_x005F_x000D_ Which statement is true?

A. This code can throw an InterruptedException.
B. This code can throw an IllegalMonitorStateException.
C. This code can throw a TimeoutException after ten minutes
D. All the above
Answer» C. This code can throw a TimeoutException after ten minutes
Discussion