ITI COPA Java MCQ important Questions and Answers
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The document consists of multiple-choice questions (MCQs) related to Java programming concepts, primarily aimed at ITI COPA students. It covers topics such as primitive data types, exception handling, memory management, object-oriented principles, and file handling, with each question followed by multiple options and answers. This resource serves as a study aid for students preparing for exams or looking to enhance their understanding of Java.
![Java Most important MCQ for ITI COPA Students
1. Number of primitive data types in Java are ____
a) 6 b) 7 c) 8 d) 9
Ans. c
2. What is the size of float and double in java?
a) 32 and 64 b) 32 and 32
c) 64 and 64 d) 64 and 32
Ans. a
3. Automatic type conversion is possible in which of the following cases?
a) Byte to int
b) Int to long
c) Long to int
d) Short to int
Ans. b
4. Find the output of the following code.
int Integer = 24;
char String = ‘I’;
System.out.print(Integer);
System.out.print(String);
a) Compiler error
b) Throws exception
c) I
d) 24 I
Ans. d
5. Select the valid statement to declare and initialize an array.
a) int[] A = {}
b) int[] A = {1, 2, 3}
c) int[] A = (1, 2, 3)
d) int[][] A = {1, 2, 3}
Ans. b
6. Arrays in java are –
a) Object references
b) Objects
c) Primitive data type
d) None
Ans. b](https://image.slidesharecdn.com/iticopajavamcq-241203015126-49cd2885/85/ITI-COPA-Java-MCQ-important-Questions-and-Answers-1-320.jpg)
![121. A valid identifier in Java language may contain which characters?
a) 0-9
b) A-Z, a-z
c) $, _ (Underscore)
d) All the above
Ans. d
122. What are the valid white spaces available in Java language?
a) Space
b) Enter
c) Tab
d) All the above
Ans. d
1. Identify the output of the following program.
String str = “Hellow”;
System.out.println(str.indexOf(‘t));
a) 0
b) 1
c) true
d) -1
2. Identify the output of the following program.
Public class Test{
Public static void main(String argos[]){
String str1 = “one”;
String str2 = “two”;
System.out.println(str1.concat(str2));
}
}
a) one
b) two
c) onetwo
d) twoone
3. What does the following string do to given string str1.
String str1 = “Heetson”.replace(‘e’, ‘s’);
a) Replaces single occurrence of ‘e’ to ‘s’
b) Replacese all occurrences of ‘e’ to ‘s’
c) Replaces single occurrence of ‘s’ to ‘e’
d) None
4. Which component is used to compile, debug and execute the java programs?
a) JRE b) JIT c) JDK d) JVM](https://image.slidesharecdn.com/iticopajavamcq-241203015126-49cd2885/85/ITI-COPA-Java-MCQ-important-Questions-and-Answers-19-320.jpg)
ITI COPA Java MCQ important Questions and Answers
- 1. Java Most important MCQ for ITI COPA Students 1. Number of primitive data types in Java are ____ a) 6 b) 7 c) 8 d) 9 Ans. c 2. What is the size of float and double in java? a) 32 and 64 b) 32 and 32 c) 64 and 64 d) 64 and 32 Ans. a 3. Automatic type conversion is possible in which of the following cases? a) Byte to int b) Int to long c) Long to int d) Short to int Ans. b 4. Find the output of the following code. int Integer = 24; char String = ‘I’; System.out.print(Integer); System.out.print(String); a) Compiler error b) Throws exception c) I d) 24 I Ans. d 5. Select the valid statement to declare and initialize an array. a) int[] A = {} b) int[] A = {1, 2, 3} c) int[] A = (1, 2, 3) d) int[][] A = {1, 2, 3} Ans. b 6. Arrays in java are – a) Object references b) Objects c) Primitive data type d) None Ans. b
- 2. 7. When is the object created with new keyword? a) At run time b) At compile time c) Depends on the code d) None Ans. a 8. Identify the correct definition of a package. a) A package is a collection of editing tools b) A package is a collection of classes c) A package is a collection of classes and interfaces d) A package is a collection of interfaces Ans. c 9. compareTo() returns a) True b) False c) An int value d) None Ans. c 10. To which of the following does the class string belong to a) java.lang b) java.awt c) java.applet d) java.string Ans. a 11. How many objects will be created in the following? String a = new String(“Interviewbit”); String b = new String(“Interviewbit”); Strinc c = “Interviewbit”; String d = “Interviewbit”; a) 2 b) 3 c) 4 d) None Ans. b Explanation: Using the new keyword creates an object everytime. Hence, 2 objects are created for first two statement. Next, a string is declared which creates another object. For the fourth statement, since, a string ”Interviewbit” already exists, it doesn’t create an additional object again. Hence, answer is 3 12. Total constructor string class have a) 3 b) 7 c) 13 d) 20 Ans. c
- 3. 13. Find the output of the following code. if(1 + 1 + 1 + 1 + 1 == 5){ System.out.print(“TRUE”); } else{ System.out.print(“FALSE”); } a) TRUE b) FALSE c) Compile error d) None Ans. a 14. Identify the return type of a method that does not return any value. a) int b) void c) double d) None Ans. b 15. Where does the system stores parameters and local variables whenever a method is invoked? a) Heap b) Stack c) Array d) Tree Ans. b 16. Identify the modifier which cannot be used for constructor. a) public b) protected c) private d) static Ans. d 17. When is the finalize() method called? a) Before garbage collection b) Before an object goes out of scope c) Before a variable goes out of scope d) None Ans. a 18. Identify the infinite loop a) for(; ;) b) for(int i = 0; i < 1; i--) c) for(int i = 0; ;i++) d) All of the above Ans. d
- 4. 19. What is Runnable? a) Abstract class b) Interface c) Class d) Method Ans. b 20. Exception created by try block is caught in which block a) catch b) throw c) final d) none Ans. a 21. Where is System class defined? a) java.lang.package b) java.util.package c) java.io.package d) None Ans. a 22. Which of the following statements are true about finalize() method? a) It can be called Zero or one times b) It can be called Zero or more times c) It can be called Exactly once d) It can be called One or more times Ans. a 23. Which one of the following is not an access modifier? a) Protected b) Void c) Public d) Private Ans. b 24. Which environment variable is used to set the java path? a) MAVEN_Path b) JavaPATH c) JAVA d) JAVA_HOME Ans. d 25. Which of the following is not an OOPS concept in Java? a) Polymorphism b) Inheritance c) Compilation d) Encapsulation Ans. c
- 5. 26. Which of the following is a type of polymorphism in Java Programming? a) Multiple polymorphism b) Compile time polymorphism c) Multilevel polymorphism d) Execution time polymorphism Ans. b 27. What is Truncation in Java? a) Floating-point value assigned to a Floating type b) Floating-point value assigned to an integer type c) Integer value assigned to floating type d) Integer value assigned to floating type Ans. b 28. What is the extension of compiled java classes? a) .txt b) .js c) .class d) .java Ans. c 29. Which exception is thrown when java is out of memory? a) MemoryError b) OutOfMemoryError c) MemoryOutOfBoundsException d) MemoryFullException Ans. b 30. Which of the following is a superclass of every class in Java? a) ArrayList b) Abstract class c) Object class d) String Ans. c 31. Which of the below is not a Java Profiler? a) JProfiler b) Eclipse Profiler c) JVM d) JConsole Ans. c 32. Which of these packages contains the exception Stack Overflow in Java? a) java.io b) java.system c) java.lang d) java.util Ans. c
- 6. 33. Which of these keywords are used for the block to be examined for exceptions? a) check b) throw c) catch d) try Ans. d 34. What is the numerical range of a char data type in Java? a) 0 to 256 b) -128 to 127 c) 0 to 65535 d) 0 to 32767 Ans. c 35. Which class provides system independent server side implementation? a) Server b) ServerReader c) Socket d) ServerSocket Ans. d 36. Which of the following option leads to the portability and security of Java? a) Bytecode is executed by JVM b) The applet makes the Java Code secure and portable c) User of exception handling d) Dynamic binding between objects Ans. a 37. Which of the following is not a Java features? a) Dynamic b) Architecture Neutral c) Use of pointers d) Object-oriented Ans. c 38. Which of the following is a valid long literal? a) ABH8097 b) L990023 c) 904423 d) 0xnf029L Ans. d Explanation: For every long literal to be recognized by Java, we need to add L character at the end of the expression. It can be either uppercase (L) or lowercase (l) character. However, it is recommended to use uppercase character instead of lowercase because the lowercase (l) character is hard to distinguish from the uppercase (i) character.
- 7. 39. Which of the following tool is used to generate API documentation in HTML format from doc comments in source code? a) javap tool b) javaw command c) javadoc tool d) javah command Ans. c 40. Which of the following creates a List of 3 visible items and multiple selections abled? a) new List(false, 3) b) new List(3, true) c) new List(true, 3) d) new List(3, false) Ans. b 41. Which keyword is used for accessing the features of a package? a) package b) import c) extends d) export Ans. b 42. What is the initial quantity of the ArrayList list? a) 5 b) 10 c) 0 d) 100 Ans. b 43. Which of the following is a mutable class in java? a) java.lang.String b) java.lang.Byte c) java.lang.Short d) java.lang.StringBuilder Ans. d 44. What is meant by the classes and objects that dependents on each other? a) Tight Coupling b) Cohesion c) Loose Coupling d) None of these Ans. a 45. How many threads can be executed at a time? a) Only one thread b) Multiple threads c) Only main(main() method) thread d) Two thread Ans. b
- 8. 46. In character stream I/O, a single read/write operation performs ______. a) Two bytes read/write at a time b) Eight bytes read/write at a time c) One byte read/write at a time d) Five bytes read/write at a time Ans. a 47. What is the use of final keyword in Java? a) When a class is made final, a subclass or it can’t be created b) When a method is final, it can’t be overridden c) When a variable is final, it can be assigned value only once d) All of the above Ans. d 48. JDK stands for _____ a) Java development kit b) Java deployment kit c) Java Script deployment kit d) None of these Ans. a 49. JRE stands for _____. a) Java run ecosystem b) JDK runtime environment c) Java Runtime Environment d) None of these Ans. c 50. What makes the Java platform independent? a) Advanced programming language b) It uses bytecode for execution c) Class compilation d) All of these Ans. b 51. What are the types of memory allocated in memory in java? a) Heap memory b) Stack memory c) Both A and B d) None of these Ans. c 52. What is the entry point of a program in Java? a) main() method b) The first line of code c) Last line of code d) main class Ans. a
- 9. 53. Which class in Java is used to take input from the user? a) Scanner b) Input c) Applier d) None of these Ans. a 54. Which of these is a type of variable in Java? a) Instance variable b) Local Variable c) Static variable d) All of these Ans. d 55. What is type casting in Java? a) It is a converting type of a variable from one type to another b) Casting variable to the class c) Creating a new variable d) All of these Ans. a 56. Which of the following can be declared as final in Java? a) Class b) Method c) Variable d) All of these Ans. d 57. The break statement in java is used to _____. a) Terminates from the loop immediately b) Terminates from program immediately c) Skips the current iteration d) All of these Ans. a 58. Array in Java is ____ a) Collection of similar elements b) Collection of elements of different types c) The data type of consisting of characters d) None of these Ans. a 59. Object in java are _____ a) Classes b) References c) Iterators d) None of these Ans. b
- 10. 60. What is garbage collection in Java? a) Method to manage memory in java b) Create new garbage values c) Delete all values d) All of these Ans. a 61. Static variables in java are declared as ____. a) Final variables b) new variables c) Constants d) All of these Ans. c 62. BigInteger class is used to ______. a) Store very long range of number b) Store integer values c) A class that stores large range of integer d) All of these Ans. d 63. ‘this’ keyword in java is ______ a) Used to hold the reference of the current object b) Holds object value c) Used to create a new instance d) All of these Ans. a 64. Wrapper class in java is _____ a) Used to encapsulate primitive data types b) Declare new classes called wrapper c) Create a new instance of the class d) None of these Ans. a 65. What is file handling in java? a) It is creating, deleting and modifying files using a java program b) Creating new method c) Filing method to different file to extract them better d) All of these Ans. a 66. Which method is used to add a new line to file in java? a) file.addLine() b) file.nextLine() c) file.write() d) file.line() Ans. c
- 11. 67. Which method deletes a file in Java? a) file.delete() b) file.remove() c) file.garbage() d) file.dump() Ans. a 68. Which method in java is used to read lines from file? a) file.read() b) file.nextLine() c) file.getLine() d) All of these Ans. c 69. The correct syntax to import the math library in java is _____. a) import java.lang.math b) import math c) import java.math d) All of these Ans. a 70. Which is valid method of math library in java? a) max() b) cbrt() c) log10() d) All of these Ans. d 71. Which method in java is used to generate random numbers in java? a) random.nextInt() b) random() c) rant() d) All of these Ans. a 72. Which of the following is a valid data structure in java? a) Array b) List c) Vector d) All of these Ans. d 73. Encapsulation is ____. a) Wrapping up of data and related functions into a single entity b) Creating special methods c) Creating special data structure d) All of these Ans. a
- 12. 74. Which java method is used to convert an object to string? a) createString() b) toString() c) object.string() d) newString() Ans. b 75. What is a comparator in java? a) Interface to compare integer b) Comparison method for lists c) Interface to compare two objects in java d) All of these Ans. c 76. Which of the following methods are present in comparator interface? a) compare() b) equate() c) isEqual() d) All of these Ans. a 77. Batch processing in java is ____. a) Used to execute a group of queries or a batch as executing a single query, again and again, is time taking and reduce the performance b) Used to processing multiple queries can be executed at once c) Used to increase program’s performance d) All of these Ans. d 78. Null in java is ____ a) Reserved keywords b) Literal value c) Used in exception handling d) All of these Ans. d 79. What is pylymorphism in java? a) Performing a single task in multiple ways b) Performing multiple tasks using multiple methods c) Creating a new class for each task d) All of these Ans. a 80. When a finally block executed in java? a) Try block is executed without any exception b) Exception has occurred c) Executed at last d) None of these Ans. c
- 13. 81. What is Boolean in java? a) A value consisting of only true and false value b) A value consisting of 8 values c) Truthy value in java d) All of these Ans. a 82. Which method in java is used to check for NaN values? a) isNan() b) checkNan() c) isNotNan() d) All of these Ans. a 83. Multithreading in java is ____ a) Executing multiple processes simultaneously b) Creating more threads at a time c) Blocking threads d) All of these Ans. a 84. Which method is used to convert radians to degree in Java? a) convertRadtoDeg() b) toDegrees() c) degree() d) All of these Ans. b 85. Which of the following methods is used to extract the length of a string in java? a) length() b) len() c) sizeof() d) size() Ans. a 86. Which java method is used to clear element of ArrayList? a) deleteAll() b) delete() c) clearAll() d) clear() Ans. d 87. Which java method is used to detect the OS in which java program is being run? a) system.getOSdetails() b) system.get(os.name) c) system.getProperties(“os.name”) d) system.getProperties(“os”) Ans. c
- 14. 88. What is the full form of AWT? a) Absolute window toolkit b) Abstract window toolkit c) Absolute wear kit d) Abstract window tools Ans. b 89. Jar in java stands for ____ a) Java ARchive b) Java application runtime c) Java application runner d) None of these Ans. a 90. Which of the following operators can operate on a boolean variable? A. && B. == C. ?: D. += a) C & B b) A & D c) A, B & D d) A, B & C Ans. d 91. What would happen to the thread whenever the garbage collection kicks off? a. The garbage collection won’t happen until the running of the thread b. The thread would continue its operation c. The garbage collection and the thread don’t interfere with each other d. The thread would be paused while the running of the garbage collection Ans. d 92. Which class produces objects with respect to their geographical locations? a. Simple TimeZone b. Date c. Locale d. TimeZone Ans. c 93. Which mechanism helps in the process of naming as well as visibility control of the classes and their content? a. Packages b. Interfaces c. Object d. None of the above Ans. a
- 15. 94. Java is a successor to which programming language? a) B b) C c) C++ d) D Ans. c Explanation: C++ introduced OOPs (Object Oriented Programming) concepts which are adopted by Java. 95. What is the original name of java programming language? a) JQuery b) C++ c) OAK d) Twik Ans. c 96. Which laboratory was java invented or developed in? a) Bell Laboratory b) Sun Microsystems c) Dennis Ritchie Office d) Johnson and Johnson Ans. b 97. The name “Java” is known to the world as? a) A Tea Brand in India b) A Coffee Brand in Africa c) An Island Indonesia d) Ragi Malt Juice Ans. c 98. Java language was originally developed for operating? a) TV b) TV set-top box c) Embedded System equipment d) All of these Ans. d 99. What type of java programs can be run inside a java supported web browser? a) Stand alone b) Struts c) Applets d) AWT Ans. c 100. Which company owns java at present? a) IBM b) Microsoft c) Sun Microsystems d) Oracle Ans. d
- 16. 101. Choose a correct statement about java source files. a) Java files are human readable b) Java files contain classes with methods and variables c) Import statements import library Classes into our class d) All the above Ans. d 102. What is the output of compilation of Java program? a) .class file b) .cls file c) .js file d) .javax file Ans. a 103. What software compiles a java program? a) JRE (Java Runtime Environment) b) JDK (Java Developer Kit) c) JVM (Java Virtual Machine) d) Command Prompt Ans. b 104. What software runs a java program on a computer? a) JRE (Java Runtime Environment) b) JDK (Java Developer kit) c) Command prompt d) None of these Ans. a 105. What does JVM stands for? a) Java Variable Machine b) Java Virtual Machine c) Java Virtual Mechanism d) None of the above Ans. b 106. What is JVM? a) JVM is the confined memory area b) All Java Programs run inside JVM Memory c) JVM provides security to the computer by giving controlled access to files and memory on a computer d) All of the above Ans. d 107. When was first version of java i.e java 1.0 was released? a) 1991 b) 1994 c) 1996 d) 1999 Ans. d
- 17. 108. What is portability offered by Java language? a) Small code size easy to carry occupying less disk space b) Generating suitable byte code for each machine by the compiler c) Ability to run the byte on different machines producing the same behavior and output d) Java does not actually provide portability Ans. c 109. What is JIT in Java? a) Java in Timer b) Java in Time Thread c) Java in Time Compiler d) Just in Time Runnable Ans. c 110. What happens in the absence of JIT compiler in Java? a) Byte code is produced slowly b) Executable code in produced slowly because of line by line interpreting c) Executable code is produced without portability d) None of the above Ans. b 111. What is the main distribution types of java software? a) Java SE (Java Standard Edition) b) Java EE (Java Enterprise Edition) c) Java ME (Java Micro Edition) d) All the above Ans. d 112. What is the java distribution type used to build web apps in Java? a) Java SE b) Java EE c) Java ME d) Java Embedded Ans. b 113. What is the Java command used to compile a java program from command line or command prompt or CMD? a) >java hello.java b) > javac hello.java c) > javacomp hello.java d) >javacmd hello.java Ans. b 114. What is the command used to Run a Java program from command line or command prompt of CMD? a) javac hello b) java hello.class c) java hello d) java hello.java Ans. c
- 18. 115. What is Java Editor? a) Java editor is simply an IDE like notepad to type or edit java program. It does not have ability compiling or running java programs without installing separate java packages on the pc. B) Java editor is like Eclipse IDE that has shortcut options or buttons to compile and run java programs without using CMD or Command Line. C) Java IDE searches for the installed Java location for JAVAC, JAVA and JAWAH to compile and run programs for you. D) All the above Ans. d 116. Every statement in Java language should end with a? a) Dot or period b) Comma c) Semicolon d) Colon Ans. c 117. A function in C language is similar to what in Java language? a) Method b) Member c) Variable d) None of the above Ans. a 118. What is the use of Access modifier “public” in Java language? a) To hide the main method from misuse b) To call the main method outside of class or package by JVM c) To protect main method d) None of the above Ans. b 119. Choose a single line comment in Java language below? a) //some comments b) some comments// c) /*Some comments*/ d) */Some comments/* Ans. a 120. Name the class, variable, method or an interface in java language is called? a) Argument b) Value c) Identifier d) None of the above Ans. c
- 19. 121. A valid identifier in Java language may contain which characters? a) 0-9 b) A-Z, a-z c) $, _ (Underscore) d) All the above Ans. d 122. What are the valid white spaces available in Java language? a) Space b) Enter c) Tab d) All the above Ans. d 1. Identify the output of the following program. String str = “Hellow”; System.out.println(str.indexOf(‘t)); a) 0 b) 1 c) true d) -1 2. Identify the output of the following program. Public class Test{ Public static void main(String argos[]){ String str1 = “one”; String str2 = “two”; System.out.println(str1.concat(str2)); } } a) one b) two c) onetwo d) twoone 3. What does the following string do to given string str1. String str1 = “Heetson”.replace(‘e’, ‘s’); a) Replaces single occurrence of ‘e’ to ‘s’ b) Replacese all occurrences of ‘e’ to ‘s’ c) Replaces single occurrence of ‘s’ to ‘e’ d) None 4. Which component is used to compile, debug and execute the java programs? a) JRE b) JIT c) JDK d) JVM
- 20. 5. Who invented Java Programming? a) Guido van Rossum b) James Gosling c) Dennis Ritchie d) Bjarne Stroustrup 6. Which statement is true about Java? a) Java is a sequence-dependent programming language b) Java is a code dependent programming language c) Java is a platform-dependent programming language d) Java is a platform-independent programming language 7. Which of these cannot be used for a variable name in Java? a) identifier & keyword b) identifier c) keyword d) none of the mentioned 8. What is the extension of java code files? a) .js b) .txt c) .class d) .java 9. Which of these are selection statements in Java? a) break b) continue c) for() d) if() 10. Multiline comment is created using _____. a) // b) /* */ c) <!-- --> d) All of these Click here for Answers COPA Best MCQ Book in Just Rs.19/-(New Syllabus) https://bharatskills.in/copa-mcq-book-pdf/ HEETSON Telegram https://t.me/Heetson_Official WhatsApp Channel @heetsoniti