Question#1
Which of the following describes a local variable in Java?
a) A variable declared within a method and accessible only there ✅- Answer
b) A variable declared outside all methods, visible everywhere
c) A variable declared with the static keyword inside a method
d) A variable declared within a class and shared by all instances

Question#2
How are instance variables initialized if not explicitly assigned in Java?
a) They are initialized to zero only
b) They are initialized with default values ✅- Answer
c) They must be initialized in the constructor
d) They remain uninitialized until used

Question#3
What keyword is used to declare a class (static) variable in Java?
a) final
b) instance
c) static ✅- Answer
d) class

Question#4
Which statement about implicit casting in Java is correct?
a) It only works for reference types
b) It happens automatically when assigning a smaller type to a larger type ✅- Answer
c) It requires explicit syntax from the programmer
d) It never happens between numeric types

Question#5
What is explicit casting in Java also known as?
a) Auto conversion
b) Narrowing typecasting ✅- Answer
c) Widening typecasting
d) Type wrapping

Question#6
What does the Integer.parseInt method do in Java?
a) Converts a String to a double
b) Converts a String to an int ✅- Answer
c) Converts an int to a String
d) Converts a double to an int

Question#7
Which method is used to convert an int to a String in Java?
a) valueOfInt()
b) toString()
c) String.valueOf() ✅- Answer
d) parseInt()

Question#8
What is a wrapper class in Java?
a) A class that stores arrays
b) A class for string manipulation
c) A class to wrap control statements
d) A class used to treat primitive types as objects ✅- Answer

Question#9
Which of the following is the wrapper class for the primitive type 'int'?
a) IntWrapper
b) IntObject
c) Integer ✅- Answer
d) IntClass

Question#10
What is autoboxing in Java?
a) Automatic conversion of a primitive type to its wrapper class ✅- Answer
b) Converting a class variable to an instance variable
c) Manual conversion of a wrapper type to primitive
d) Explicit casting from double to int

Question#11
What describes unboxing in Java?
a) Array to object conversion
b) Narrowing typecasting
c) Automatic conversion of a wrapper type to its primitive type ✅- Answer
d) Manual conversion of a primitive to wrapper

Question#12
Which control statement evaluates a Boolean expression and executes code if the condition is true?
a) if statement ✅- Answer
b) switch statement
c) for loop
d) continue statement

Question#13
Which type of 'if' statement creates a chain of decisions in Java?
a) for-each statement
b) simple if statement
c) switch-case statement
d) if-else-if ladder ✅- Answer

Question#14
In a switch statement, when is the default block executed?
a) When the break statement is missing
b) When no case matches the switch expression ✅- Answer
c) When switch variable is a String
d) When all case conditions are true

Question#15
Which data type can be used as a case variable in a Java switch statement (since Java 7)?
a) float
b) String ✅- Answer
c) boolean
d) double

Question#16
What is the main purpose of control flow statements in Java?
a) To manage the execution order of program statements ✅- Answer
b) To declare and initialize variables
c) To create new objects
d) To write comments in code

Question#17
Which of the following best describes the for-each loop in Java?
a) A loop that repeats a fixed number of times
b) A loop for infinite execution
c) A loop for traversing elements in an array or collection ✅- Answer
d) A loop for switching between cases

Question#18
Why are wrapper classes commonly used in Java?
a) To use primitive data types where objects are required ✅- Answer
b) To create local variables
c) To convert objects to arrays
d) To improve performance of arithmetic operations

Question#19
Which output will be produced by the 'if' statement sample where x=10 and y=12 and code checks if (x+y > 20)?
a) x + y is less than 10
b) x + y is greater than 20 ✅- Answer
c) x + y equals 22
d) x + y is not defined

Question#20
What happens if a break statement is omitted in a switch-case in Java?
a) The default case runs automatically
b) The switch block exits immediately
c) Control falls through to the next case ✅- Answer
d) An error occurs