McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Computer Applications (BCA) , Bachelor of Science in Computer Science (BSc CS) , Master of Computer Applications (MCA) , Programming Languages .
| 51. |
A primitive data type can be passed as an argument into a method |
| A. | By value |
| B. | by reference |
| C. | both a & b |
| D. | none of these |
| Answer» A. By value | |
| 52. |
Which of these is used as default for a member of a class if no access specifier is used for it? |
| A. | private |
| B. | public |
| C. | public, within its own package |
| D. | protected |
| Answer» C. public, within its own package | |
| 53. |
Which of these keywords is used to refer to member of base class from a sub class? |
| A. | upper |
| B. | super |
| C. | this |
| D. | None of the mentioned |
| Answer» B. super | |
| 54. |
Which of these is correct way of inheriting class A by class B? |
| A. | class B + class A {} |
| B. | class B inherits class A {} |
| C. | class B extends A {} |
| D. | class B extends class A {} |
| Answer» C. class B extends A {} | |
| 55. |
Which of the following are true about interfaces. |
| A. | Methods declared in interfaces are implicitly private. |
| B. | Variables declared in interfaces are implicitly public, static, and final. |
| C. | An interface contains any number of method definitions. |
| D. | The keyword implements indicate that an interface inherits from another. |
| Answer» B. Variables declared in interfaces are implicitly public, static, and final. | |
| 56. |
Which of these keywords is used to define interfaces in Java? |
| A. | interface |
| B. | Interface |
| C. | intf |
| D. | implements |
| Answer» A. interface | |
| 57. |
Which of these can be used to fully abstract a class from its implementation? |
| A. | Objects |
| B. | Packages |
| C. | Interfaces |
| D. | None of the Mentione |
| Answer» C. Interfaces | |
| 58. |
Which of these access specifiers can be used for an interface? |
| A. | Public |
| B. | Protected |
| C. | private |
| D. | All of the mentioned |
| Answer» A. Public | |
| 59. |
Which of these keywords is used by a class to use an interface defined previously? |
| A. | import |
| B. | Import |
| C. | implements |
| D. | Implements |
| Answer» C. implements | |
| 60. |
Which of the following is correct way of implementing an interface salary by class manager? |
| A. | class Manager extends salary {} |
| B. | class Manager implements salary {} |
| C. | class Manager imports salary {} |
| D. | None of the mentioned |
| Answer» B. class Manager implements salary {} | |
| 61. |
The keyword used to create a package is |
| A. | import |
| B. | package |
| C. | classpath |
| D. | public |
| Answer» B. package | |
| 62. |
The modifier which specifies that the member can only be accessed in its own class is |
| A. | public |
| B. | private |
| C. | protected |
| D. | none |
| Answer» B. private | |
| 63. |
Which of the following package stores all the standard java classes? a) jav |
| A. | lang |
| B. | java |
| C. | java.util |
| D. | java.packages |
| Answer» A. lang | |
| 64. |
Which of these is a mechanism for naming and visibility control of a class and its content? |
| A. | Object |
| B. | Packages |
| C. | Interfaces |
| D. | None of the Mentioned |
| Answer» B. Packages | |
| 65. |
Which of this access specifies can be used for a class so that its objects can be created by a different class in another package? |
| A. | Public |
| B. | Protected |
| C. | No Modifier |
| D. | All of the mentioned |
| Answer» A. Public | |
| 66. |
Which of the following is correct way of importing an entire package ‘pkg’? |
| A. | import pkg. |
| B. | Import pkg. |
| C. | import pkg.* |
| D. | Import pkg.* |
| Answer» C. import pkg.* | |
| 67. |
Which of the following is incorrect statement about packages? |
| A. | Package defines a namespace in which classes are stored. |
| B. | A package can contain other package within it. |
| C. | Java uses file system directories to store packages. |
| D. | A package can be renamed without renaming the directory in which the classes are stored. |
| Answer» D. A package can be renamed without renaming the directory in which the classes are stored. | |
| 68. |
Which of these method of class String is used to extract a single character from a String object? |
| A. | CHARAT() |
| B. | chatat() |
| C. | charAt() |
| D. | ChatAt() |
| Answer» C. charAt() | |
| 69. |
Which of these method of class String is used to obtain length of String object? |
| A. | get() |
| B. | Sizeof() |
| C. | lengthof() |
| D. | length() |
| Answer» D. length() | |
| 70. |
Which of these keywords is not a part of exception handling? |
| A. | try |
| B. | finally |
| C. | thrown |
| D. | catch |
| Answer» C. thrown | |
| 71. |
The code within the ----------- block will always be executed whether or not an exception is thrown. |
| A. | try..catch |
| B. | finally |
| C. | throw |
| D. | throws |
| Answer» B. finally | |
| 72. |
Which of these keywords must be used to monitor for exceptions? |
| A. | try..catch |
| B. | finally |
| C. | throw |
| D. | throws |
| Answer» A. try..catch | |
| 73. |
Which of these keywords is used to manually throw an exception? |
| A. | try |
| B. | finally |
| C. | throw |
| D. | catch |
| Answer» C. throw | |
| 74. |
Which of these classes is related to all the exceptions that can be caught by using catch? |
| A. | Error |
| B. | Exception |
| C. | None of these |
| D. | a & b |
| Answer» B. Exception | |
| 75. |
Which of these classes is related to all the exceptions that cannot be caught? |
| A. | Error |
| B. | Exception |
| C. | None of these |
| D. | a & b |
| Answer» A. Error | |
| 76. |
Which exception is thrown by read() method? |
| A. | IOException |
| B. | InterruptedException |
| C. | SystemException |
| D. | SystemInputException |
| Answer» A. IOException | |
| 77. |
Which is the super class of all exception classes |
| A. | Exception |
| B. | Object |
| C. | Error |
| D. | Throwable |
| Answer» D. Throwable | |
| 78. |
Which class is the super class of all classes of the java.lang package? |
| A. | Object |
| B. | System |
| C. | Super |
| D. | Class |
| Answer» A. Object | |
| 79. |
Which of the following exception is raised when a number is divided by zero |
| A. | NumberFormatException |
| B. | ArithmeticException |
| C. | NullPointerException |
| D. | IllegalArgumentException |
| Answer» B. ArithmeticException | |
| 80. |
A single try block must be followed by which of these? |
| A. | finally |
| B. | catch |
| C. | catch or finally |
| D. | None of the mentioned |
| Answer» C. catch or finally | |
| 81. |
Which of these exceptions will occur if we try to access the index of an array beyond its length? |
| A. | ArithmeticException |
| B. | ArrayException |
| C. | ArrayIndexException |
| D. | ArrayIndexOutOfBoundsException |
| Answer» D. ArrayIndexOutOfBoundsException | |
| 82. |
Runnable is a |
| A. | Class |
| B. | Method |
| C. | Variable |
| D. | Interface |
| Answer» D. Interface | |
| 83. |
Thread priority in Java is represented as? |
| A. | int |
| B. | Float |
| C. | double |
| D. | long |
| Answer» A. int | |
| 84. |
Which of these class is used to make a thread? |
| A. | String |
| B. | System |
| C. | Thread |
| D. | Runnable |
| Answer» C. Thread | |
| 85. |
Which of these interface is implemented to create a Thread? |
| A. | Runnable |
| B. | Connections |
| C. | Set |
| D. | MapConnections |
| Answer» A. Runnable | |
| 86. |
Which of these method of Thread class is used to find out the priority given to a thread? |
| A. | get() |
| B. | ThreadPriority() |
| C. | getPriority() |
| D. | getThreadPriority() |
| Answer» C. getPriority() | |
| 87. |
Which of this method of Thread class is used to change the state of a thread to blocked state? |
| A. | sleep() |
| B. | terminate() |
| C. | stop() |
| D. | block() |
| Answer» A. sleep() | |
| 88. |
Which method in Thread class is used to check weather a thread is still running? |
| A. | isAlive() |
| B. | Join() |
| C. | isRunning() |
| D. | Alive() |
| Answer» A. isAlive() | |
| 89. |
Which of these methods is used to begin the execution of a thread? |
| A. | run() |
| B. | start() |
| C. | runThread() |
| D. | startThread() |
| Answer» B. start() | |
| 90. |
Which of these method waits for the thread to treminate? |
| A. | sleep() |
| B. | isAlive() |
| C. | join() |
| D. | stop() |
| Answer» C. join() | |
| 91. |
Which of these is used to read a string from the input stream? |
| A. | get() |
| B. | getLine() |
| C. | read() |
| D. | readLine() |
| Answer» D. readLine() | |
| 92. |
Which of these classes is used to read characters and strings in Java from console? |
| A. | BufferedReader |
| B. | StringReader |
| C. | BufferedStreamReader |
| D. | InputStreamReader |
| Answer» D. InputStreamReader | |
| 93. |
Which of these classes are used by Byte streams for input operation? |
| A. | InputStream |
| B. | InputOutputStream |
| C. | Reader |
| D. | All of the mentioned |
| Answer» A. InputStream | |
| 94. |
Which of these class contains the methods print() & println()? |
| A. | System |
| B. | System.out |
| C. | BufferedOutputStream |
| D. | PrintStream |
| Answer» D. PrintStream | |
| 95. |
Which of these methods can be used to write console output? |
| A. | printout() |
| B. | println() |
| C. | write() |
| D. | All of the mentioned |
| Answer» B. println() | |
| 96. |
Which of these classes are used by character streams output operations? |
| A. | OutputStream |
| B. | Writer |
| C. | ReadStream |
| D. | InputOutputStream |
| Answer» B. Writer | |
| 97. |
Which refers to a channel through which data flow from the source to the destination: |
| A. | String |
| B. | Character |
| C. | Stream |
| D. | Buffer |
| Answer» C. Stream | |
| 98. |
Java Stream classes can be categorized into two groups: |
| A. | Byte and Character Stream Classes |
| B. | Stream and String Classes |
| C. | String and Character Stream Classes |
| D. | Buffer and Character Stream Classes |
| Answer» A. Byte and Character Stream Classes | |
| 99. |
Byte Stream Classes support input/output operations on _____ |
| A. | 8 bit |
| B. | 16 bit |
| C. | 32 bit |
| D. | 64 bit |
| Answer» A. 8 bit | |
| 100. |
Character Stream Classes support input/output operations on _______ characters: |
| A. | 8 bit Unicode |
| B. | 16 bit Unicode |
| C. | 32 bit Unicode |
| D. | 64 bit Unicode |
| Answer» B. 16 bit Unicode | |
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