Q1. What is Java?

a) A type of coffee

b) A programming language

c) An operating system

d) A brand of clothing

View Answer Q2. Which of the following is true about Java?

a) It is a purely procedural language

b) It can only be used for web development

c) It is platform-independent

d) It is a low-level language

View Answer Q3. What is a class in Java?

a) A template for creating objects

b) A built-in data type

c) A loop structure

d) A file extension

View Answer Q4. In Java, which keyword is used to create an instance of a class?

a) instance

b) object

c) new

d) create

View Answer Q5. What is the purpose of the 'static' keyword in Java?

a) It indicates that a method is only accessible within the same class

b) It indicates that a method can be called on a class itself, rather than on an instance of the class

c) It indicates that a method is deprecated

d) It indicates that a method is synchronized

View Answer Q6. Which data type is used to store whole numbers in Java?

a) float

b) double

c) int

d) char

View Answer Q7. What is the default value of an instance variable in Java if it is not explicitly initialized?

a) 0

b) null

c) false

d) The value depends on the data type

View Answer Q8. Which Java access modifier provides the most restrictive access?

a) public

b) protected

c) default (no modifier)

d) private

View Answer Q9. What is an interface in Java?

a) A type of class that cannot be instantiated

b) A collection of static methods

c) A way to achieve multiple inheritance in Java

d) A design pattern for creating objects

View Answer Q10. Which Java keyword is used to explicitly call the superclass constructor?

a) parent

b) base

c) super

d) this

View Answer Q11. What is the purpose of the 'this' keyword in Java?

a) It refers to the current instance of the class

b) It creates a new object

c) It is used to call a superclass method

d) It is used to declare variables

View Answer Q12. Which Java loop is guaranteed to execute at least once?

a) for loop

b) while loop

c) do-while loop

d) infinite loop

View Answer Q13. What is the purpose of the 'break' statement in Java?

a) It terminates the entire program

b) It exits the current loop or switch statement

c) It continues to the next iteration of a loop

d) It skips a block of code

View Answer Q14. Which Java keyword is used to handle exceptions?

a) try

b) catch

c) throw

d) all of the above

View Answer Q15. What is the purpose of the 'finally' block in a try-catch -finally statement?

a) It is used to define a block of code that is always executed

b) It is used to handle exceptions

c) It is used to define a block of code that is executed if an exception is thrown

d) It is used to define a block of code that is only executed when no exception occurs

View Answer Q16. What is method overloading in Java?

a) Writing multiple methods with the same name but different parameters

b) Writing methods with different names but the same parameters

c) Writing methods that perform the same operation

d) Writing methods with the same name and parameters, but in different classes

View Answer Q17. What is method overriding in Java?

a) Writing methods with different names but the same parameters

b) Writing methods that perform the same operation

c) Writing methods with the same name and parameters, but in different classes

d) Writing methods in the same class with the same name and parameters as a superclass method

View Answer Q18. What is a constructor in Java?

a) A method that returns a value

b) A special method used to create objects

c) A method that is static

d) A method that cannot be overridden

View Answer Q19. What is the purpose of the 'instanceof' operator in Java?

a) It is used to check if an object is null

b) It is used to create a new instance of a class

c) It is used to check if an object is an instance of a particular class or interface

d) It is used to compare two objects for equality

View Answer Q20. What is the difference between '==' and '.equals()' when comparing objects in Java?

a) There is no difference; both operators are used interchangeably

b) '==' compares the content of the objects, while '.equals()' compares the memory addresses

c) '.equals()' compares the content of the objects, while '==' compares the memory addresses

d) '.equals()' is used for primitive data types, while '==' is used for objects

View Answer Q21. What is the Java Virtual Machine (JVM)?

a) A physical computer

b) A virtual operating system

c) A compiler

d) An environment that executes Java bytecode

View Answer Q22. Which of the following is true about the 'static' keyword when applied to fields (variables)?

a) Each instance of the class has its own copy of the field

b) The field belongs to the class itself, not to instances of the class

c) The field cannot be accessed outside the class

d) The field cannot be modified after it is initialized

View Answer Q23. What is the purpose of the 'final' keyword in Java?

a) It indicates that a class cannot be inherited

b) It indicates that a method cannot be overridden

c) It indicates that a variable cannot be modified after initialization

d) It indicates that a variable is automatically initialized

View Answer Q24. What is a package in Java?

a) A collection of classes and interfaces

b) A set of predefined classes

c) A type of data structure

d) A file that contains Java code

View Answer Q25. Which Java keyword is used to prevent a class from being subclassed?

a) sealed

b) closed

c) final

d) locked

View Answer Q26. What is autoboxing in Java?

a) The process of converting a primitive data type to an object of its corresponding wrapper class

b) The process of converting an object to a primitive data type

c) The process of converting between different data types

d) The process of converting a character to its ASCII value

View Answer Q27. What is the purpose of the 'StringBuilder' class in Java?

a) It is used to build graphical user interfaces

b) It is used to manipulate strings efficiently

c) It is used to perform mathematical calculations

d) It is used to handle exceptions in Java

View Answer Q28. What is the Java Collections Framework?

a) A set of predefined collections in Java

b) A framework for creating graphical user interfaces

c) A library for managing networking in Java

d) A framework for working with data structures and algorithms related to collections

View Answer Q29. Which collection interface in Java does not allow duplicate elements?

a) List

b) Set

c) Map

d) Collection

View Answer Q30. Which Java class is used to create threads?

a) Thread

b) Runnable

c) Executor

d) Concurrency

View Answer Q31. What is synchronization in Java?

a) The process of converting a synchronized block to an unsynchronized block

b) The process of making methods asynchronous

c) The process of preventing multiple threads from accessing shared resources simultaneously

d) The process of converting asynchronous methods to synchronous methods

View Answer Q32. Which keyword is used to create an array in Java?

a) array

b) new

c) create

d) make

View Answer Q33. What is the maximum number of dimensions an array can have in Java?

a) 1

b) 2

c) 3

d) There is no limit

View Answer Q34. What is a static method in Java?

a) A method that cannot be called on a class

b) A method that belongs to the class, not to instances of the class

c) A method that cannot be overridden

d) A method that cannot be used in a constructor

View Answer Q35. What is the purpose of the 'transient' keyword in Java?

a) It is used to make a variable constant

b) It is used to prevent a variable from being modified

c) It is used to indicate that a variable should not be serialized

d) It is used to indicate that a variable is thread-safe

View Answer Q36. What is the purpose of the 'volatile' keyword in Java?

a) It is used to declare variables with a fixed value

b) It is used to indicate that a variable can be modified by multiple threads

c) It is used to define constant variables

d) It is used to indicate that a variable cannot be modified after initialization

View Answer Q37. What is a lambda expression in Java?

a) An anonymous inner class

b) A named function

c) A type of exception

d) A concise way to represent an instance of a functional interface using a compact syntax

View Answer Q38. What is the purpose of the 'default' keyword when used in a switch statement in Java?

a) It specifies the default value for a variable

b) It specifies the default action to take if none of the cases match

c) It specifies the default visibility for a class

d) It specifies the default behavior of a loop

View Answer Q39. What is the purpose of the 'throws' keyword in Java?

a) It indicates that a method is throwing an exception

b) It indicates that a method is catching an exception

c) It indicates that a method is returning a value

d) It indicates that a method is asynchronous

View Answer Q40. What is a thread pool in Java?

a) A collection of threads with the same priority

b) A group of threads that share the same stack memory

c) A collection of pre-initialized thread objects that are used to execute tasks concurrently

d) A set of threads that are locked to a specific processor core

View Answer Q41. What is the purpose of the 'assert' statement in Java?

a) It is used to define constants

b) It is used to check if an expression is true; if false, it throws an AssertionError

c) It is used to terminate the program

d) It is used to indicate that a method has completed successfully

View Answer Q42. What is the purpose of the 'enum' keyword in Java?

a) It is used to declare variables with a fixed value

b) It is used to define a new data type that consists of a set of named values

c) It is used to create instances of classes

d) It is used to indicate that a class cannot be subclassed

View Answer Q43. What is the purpose of the 'strictfp' keyword in Java?

a) It is used to indicate that a class cannot be subclassed

b) It is used to specify that a class should be loaded in a strict order

c) It is used to define a strict file path

d) It is used to ensure consistent floating-point calculations across different platforms and processors

View Answer Q44. What is the purpose of the 'super' keyword in Java?

a) It is used to indicate that a method is static

b) It is used to call a superclass constructor or method

c) It is used to create a new instance of a class

d) It is used to define a superclass for a class

View Answer Q45. What is the purpose of the 'continue' statement in Java?

a) It terminates the loop

b) It skips the current iteration of the loop and continues with the next iteration

c) It exits the loop

d) It reverses the loop's direction

View Answer Q46. What is the purpose of the 'default' access modifier in Java?

a) It indicates that a variable has a default value

b) It indicates that a class has default behavior

c) It indicates that a variable is accessible only within its own class

d) It indicates that a variable is accessible within the same package and not outside the package

View Answer Q47. What is the purpose of the 'interface' keyword in Java?

a) It is used to define a type of exception

b) It is used to indicate that a class cannot be subclassed

c) It is used to define a new data type that consists of a set of named values

d) It is used to define a contract for implementing methods in a class

View Answer Q48. What is the purpose of the 'try-with-resources' statement in Java?

a) It is used to declare resources

b) It is used to handle exceptions

c) It is used to create a new instance of a class

d) It is used to automatically close resources after they are no longer needed

View Answer Q49. What is the purpose of the 'native' keyword in Java?

a) It is used to indicate that a method is native to a specific operating system

b) It is used to declare a variable as a constant

c) It is used to define a native data type

d) It is used to indicate that a method cannot be overridden

View Answer Q50. What is the purpose of the 'package-private' access modifier in Java? b>

a) It indicates that a variable is accessible only within its own class

b) It indicates that a variable is accessible within the same package and not outside the package

c) It indicates that a class cannot be subclassed

d) It indicates that a class has default behavior

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