JAVA-EFC CHENNAI-BATCH2 DATED 07TH NOV 2024 - MSME

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JAVA-EFC-CHENNAI BATCH2-07TH NOVEMBER 2024

1 / 50

When a finally block executed in Java?

Try block is executed without any exception

Exception has occurred

Executed at last

None of these

2 / 50

Which of the following is a valid data structure in java?

Array

List

Vector

All of these

3 / 50

Which OOP principle is used to hide the internal details of an object and only expose what is necessary?

Polymorphism

Encapsulation

Abstraction

Inheritance

4 / 50

Which of the following is the correct way to exit from all nested loops?

Use multiple break statements

Use labeled break statement

Use exit() method

Nested loops cannot be exited together

5 / 50

Which of the following statements is true about nested loops?

Nested loops are not allowed in Java

A loop inside another loop is called a nested loop

Only while loops can be nested

Nested loops must have the same iteration count

6 / 50

Which class in Java is used to take input from the user?

Scanner

Input

Applier

None of these

7 / 50

Which type of casting is lossy in Java?

Widening typecasting

Narrowing typecasting

Manual typecasting

All of these

8 / 50

The break statement in Java is used to ______________

Terminates from the loop immediately

Terminates from the program immediately

Skips the current iteration

All of these

9 / 50

Static variables in java are declared as __________________

final variables

new variables

Constants

All of these

10 / 50

Which OOP principle helps to reduce redundancy in code by reusing existing classes?

Polymorphism

Encapsulation

Inheritance

Abstraction

11 / 50

Which of these is true for interfaces in Java?

The keyword interface is used to create a method

All the methods of an interface are abstract

It does not contain constructors

All of these

12 / 50

Which method in java is used to read lines fromfile?

file.read()

file.nextLine()

file.getLine()

All of these

13 / 50

Where are Java source files stored by convention?

.java extension files

.class extension files

.jar extension files

.exe extension files

14 / 50

What will be the output of the following code?

int i = 0;
while (i < 3) {
System.out.println(i);
i++;
}

0 1 2

1 2 3

0 1 2 3

0 0 0

15 / 50

Which of these is the correct method to create an array in java?

int[] arr = {1, 3, 5};

int[] arr;

arr = new int[] {3, 1, 8};

int arr[] = {1, 4, 6};

All of these

16 / 50

Which method deletes a file in Java?

file.delete()

file.remove()

file.garbage()

file.dump()

17 / 50

Which is/are valid method(s) of math library in Java?

max()

cbrt()

log10()

All of these

18 / 50

BigInteger Class is used to ____________

Store very long range of number

Store integer values

A class that stores large range of integer

All of these

19 / 50

Which of the following is NOT an application of OOP?

Operating systems

Real-time systems

Artificial Intelligence

Spreadsheets

20 / 50

Object in java are __________

Classes

Iterators

References

None of these

21 / 50

Which thread is executed in the background?

New thread

User-created thread

Daemon thread

All of these

22 / 50

What will be the output of the following Java code?

public class Main {
public static void main(String[] args) {
String str = "Hello" ;
str = "Bye";

System.out.println(str);
}
}

Hello

Bye

Error

All of these

23 / 50

Which method is used to convert radians to degree in Java?

convertRadtoDeg()

toDegrees()

degree()

All of these

24 / 50

In Java, recursion is _____________

Method

A process allowing methods to call itself

The process to call methods

None of these

25 / 50

What is type casting in Java?

It is converting type of a variable from one type to another

Casting variable to the class

Creating a new variable

All of these

26 / 50

Array in Java is ______________

Collection of similar elements

Collection of elements of different types

The data type of consisting of characters

None of these

27 / 50

Which of the following is a valid for loop syntax in Java?

for (int i = 0; i < 10; i++) { ... }

for (i = 0; i < 10; i++) { ... }

for (int i = 0; i < 10) { ... }

for i = 0 to 10 { ... }

28 / 50

Which of the following is the correct syntax to create a variable in
Java?

var name;

int name;

var name int;

All of these

29 / 50

Which method in Java is used to check for NaN values?

isNan()

checkNan()

isNotNan()

All of these

30 / 50

Which OOP principle helps to reduce redundancy in code by reusing existing classes?

Polymorphism

Encapsulation

Inheritance

Abstraction

31 / 50

Which of these is a property of threads in Java?

Multiple threads can be executed concurrently

Has its own priority

Both A. and B

None of these

32 / 50

Finally block is attached to?

Try-catch block

Class block

Method block

All of these

33 / 50

Which syntax is valid to create a vector in java?

Vector names = new Vector ();

Vector name = new string;

int name = new vector ()

All of these

34 / 50

Which command is used to compile a Java program?

java

javac

javadoc

jar

35 / 50

Can the Java program accept input from the command line?

Yes, using command-line arguments

Yes, by access command prompt

None of these

36 / 50

Which of the following is a correct example of method overloading?

Defining multiple methods in a class with the same name but different parameter lists

Redefining a method in a subclass

Changing the return type of a method

Implementing a method from an interface

37 / 50

Multithreading in java is _______________

Executing multiple processes simultaneously

Creating more threads at a time

Blocking threads

All of these

38 / 50

Which of these is not a valid Boolean method in Java?

equals() method

hashCode() method

toString() method

All of these

39 / 50

Which of the following is NOT a principle of Object-Oriented Programming?

Encapsulation

Inheritance

Polymorphism

Recursion

40 / 50

What is the main difference between POP and OOP?

POP is data-driven, OOP is procedure-driven

POP is procedure-driven, OOP is data-driven

POP focuses on objects, OOP focuses on functions

POP and OOP are identical

41 / 50

Which programming paradigm does Java primarily support?

Functional programming

Procedural programming

Object-Oriented Programming

Logic programming

42 / 50

What is garbage collection in Java?

Method to manage memory in java

Create new garbage values

Delete all values

All of these

43 / 50

What will be the output of the following Java code?

public class Main {
public static void main(String[] args) {
System.out.println(Math.copySign(100.6, -200.6));
}

100.6

-100.6

-200.6

200.6

44 / 50

Which of the following can be declared as final in java?

Class

Method

Variable

All of these

45 / 50

Which method in java is used to generate randomnumbers in Java?

random.nextInt()

random()

rand()

All of these

46 / 50

What is stringBuffer in Java?

Class to create a string array

Class to create a mutable string in java

Class to create a string from i/o buffer

All of these

47 / 50

What is boolean in Java?

A value consisting of only true and false value

A value consisting of 8 values

Truthy value in java

All of these

48 / 50

After compilation, Java code is converted into:

Machine code

Assembly code

Bytecode

C++ code

49 / 50

The correct syntax to import the math library in Java is ______________

import java.lang.math

import math

import java.math

All of these

50 / 50

What does the java command do?

Compiles Java code

Executes Java bytecode

Documents Java code

Packages Java classes

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