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 .
| 1. |
Who is considered as the creator of JAVA ? |
| A. | Dennis Richie |
| B. | Ken Thompson |
| C. | James Gosling |
| D. | Bjarne Stroupstrup |
| Answer» C. James Gosling | |
| 2. |
Which of the following statements about the Java language is true? |
| A. | Java supports only Procedural Oriented Programming approach |
| B. | Both Procedural and Object Oriented Programming are supported in Java |
| C. | Java supports only Object Oriented Programming approach |
| D. | None of the Above |
| Answer» B. Both Procedural and Object Oriented Programming are supported in Java | |
| 3. |
JRE stands for |
| A. | Java Realtime Environment |
| B. | Java Rapid Enterprise |
| C. | Java Runtime Environment |
| D. | None of the above |
| Answer» C. Java Runtime Environment | |
| 4. |
Java source files are compiled and converted to |
| A. | Object code |
| B. | machine code |
| C. | Bytecode |
| D. | executable file |
| Answer» C. Bytecode | |
| 5. |
JVM is ___________for bytecode. |
| A. | a compiler |
| B. | an interpreter |
| C. | assembler |
| D. | none of the above |
| Answer» B. an interpreter | |
| 6. |
What is the size of int data type in java? |
| A. | 1 bytes |
| B. | 2 bytes |
| C. | 4 bytes |
| D. | 8 bytes |
| Answer» C. 4 bytes | |
| 7. |
Which is a valid float literal? |
| A. | 1.23 |
| B. | 2 |
| C. | 1.23d |
| D. | 1.23f |
| Answer» D. 1.23f | |
| 8. |
What is the numerical range of a char in Java? |
| A. | -128 to 127 |
| B. | 0 to 256 |
| C. | 0 to 32767 |
| D. | 0 to 65535 |
| Answer» D. 0 to 65535 | |
| 9. |
Which of these coding types is used for data type char in Java? |
| A. | ASCII |
| B. | ISO-LATIN-1 |
| C. | UNICODE |
| D. | None of the mentioned |
| Answer» C. UNICODE | |
| 10. |
Which of these values can a boolean variable contain? |
| A. | True & False |
| B. | 0 & 1 |
| C. | Any integer value. |
| D. | Both a & b |
| Answer» A. True & False | |
| 11. |
Which one of the following is a valid identifier in java? |
| A. | x1 |
| B. | 1x |
| C. | $x |
| D. | x 1 |
| Answer» A. x1 | |
| 12. |
Which operator is used to implement unsigned right shift of an integer? |
| A. | << |
| B. | >> |
| C. | <<< |
| D. | >>> |
| Answer» D. >>> | |
| 13. |
Which one of the following is a jump statement in java? |
| A. | goto |
| B. | jump |
| C. | break |
| D. | if |
| Answer» C. break | |
| 14. |
Which of these operators is used to allocate memory to array variable in Java? |
| A. | malloc |
| B. | alloc |
| C. | new |
| D. | new malloc |
| Answer» C. new | |
| 15. |
Which of the following loops will execute the body of loop even when condition controlling the loop is initially false? |
| A. | do-while |
| B. | while |
| C. | for |
| D. | None of the mentioned |
| Answer» A. do-while | |
| 16. |
Which of these is necessary condition for automatic type conversion in Java? |
| A. | The destination type is smaller than source type. |
| B. | The destination type is larger than source type. |
| C. | The destination type can be larger or smaller than source type. |
| D. | None of the mentioned |
| Answer» B. The destination type is larger than source type. | |
| 17. |
What is the error in this code? byte b = 50; b = b * 50; |
| A. | b can not store the result 2500, limited by its range. |
| B. | * operator has converted b * 50 into int, which can not be converted to byte without casting. |
| C. | b can not contain value 50. |
| D. | No error in this code |
| Answer» B. * operator has converted b * 50 into int, which can not be converted to byte without casting. | |
| 18. |
Which of these is an incorrect array declaration? |
| A. | int arr[] = new int[5]; |
| B. | int [] arr = new int[5]; |
| C. | int arr[]; arr = new int[5]; |
| D. | int arr[] = int [5] new |
| Answer» D. int arr[] = int [5] new | |
| 19. |
Which of these selection statements test only for equality? |
| A. | if |
| B. | switch |
| C. | Both a & b |
| D. | None of the mentioned |
| Answer» B. switch | |
| 20. |
Which of these are selection statements in Java? |
| A. | if |
| B. | for |
| C. | continue |
| D. | all of these |
| Answer» A. if | |
| 21. |
Which of these jump statements can skip processing remainder of code in its body for a particular iteration? |
| A. | break |
| B. | return |
| C. | exit |
| D. | continue |
| Answer» D. continue | |
| 22. |
What is the value of the expression 2 & 3 ? |
| A. | 2 |
| B. | 3 |
| C. | 6 |
| D. | 5 |
| Answer» A. 2 | |
| 23. |
What is the value of the expression 8 << 2 ? |
| A. | 2 |
| B. | 32 |
| C. | 1 6 |
| D. | 5 |
| Answer» B. 32 | |
| 24. |
The keyword used to create a constant variable |
| A. | const |
| B. | static |
| C. | final |
| D. | none of these |
| Answer» C. final | |
| 25. |
What is stored in the object obj in following lines of code? box obj; |
| A. | Memory address of allocated memory of object. |
| B. | NULL |
| C. | Any arbitrary pointer |
| D. | Garbage |
| Answer» B. NULL | |
| 26. |
Which of the following is a valid declaration of an object of class Box? |
| A. | Box obj = new Box(); |
| B. | Box obj = new Box; |
| C. | obj = new Box(); |
| D. | new Box obj; |
| Answer» A. Box obj = new Box(); | |
| 27. |
Name the keyword that makes a variable belong to a class, rather than being defined for each instance of the class. |
| A. | static |
| B. | final |
| C. | abstract |
| D. | public |
| Answer» A. static | |
| 28. |
Variables declared with in a class are called |
| A. | Identifier |
| B. | local variable |
| C. | instance variable |
| D. | global variable |
| Answer» C. instance variable | |
| 29. |
Variables declared within a method or block are called |
| A. | Static variable |
| B. | local variable |
| C. | instance variable |
| D. | global variable |
| Answer» B. local variable | |
| 30. |
Defining methods with same name and different no. of parameters are called |
| A. | Method overriding |
| B. | method overloading |
| C. | Dynamic method dispatch |
| D. | none of the above |
| Answer» B. method overloading | |
| 31. |
_________ is used to initialize objects. |
| A. | Methods |
| B. | arguments |
| C. | constructors |
| D. | new keyword |
| Answer» C. constructors | |
| 32. |
What is the return type of Constructors? |
| A. | int |
| B. | float |
| C. | void |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 33. |
Which of the following is a method having same name as that of its class? |
| A. | finalize |
| B. | delete |
| C. | class |
| D. | constructor |
| Answer» D. constructor | |
| 34. |
Which operator is used by Java run time implementations to free the memory of an object when it is no longer needed? |
| A. | delete |
| B. | free |
| C. | new |
| D. | None of the mentione |
| Answer» D. None of the mentione | |
| 35. |
Which of these access specifiers must be used for main() method? |
| A. | private |
| B. | public |
| C. | protected |
| D. | None of the mentioned |
| Answer» B. public | |
| 36. |
Which of these is used to access member of class before object of that class is created? |
| A. | public |
| B. | private |
| C. | static |
| D. | protected |
| Answer» C. static | |
| 37. |
The keyword used to create an object |
| A. | class |
| B. | this |
| C. | new |
| D. | malloc |
| Answer» C. new | |
| 38. |
The keyword used to refer the current object |
| A. | class |
| B. | this |
| C. | new |
| D. | malloc |
| Answer» B. this | |
| 39. |
The method which is automatically invoked during garbage collection. |
| A. | destructor |
| B. | terminate() |
| C. | finalize() |
| D. | destroy() |
| Answer» C. finalize() | |
| 40. |
Which class cannot have a subclass in java |
| A. | abstract class |
| B. | parent class |
| C. | final class |
| D. | None of above |
| Answer» C. final class | |
| 41. |
Which is the keyword used to inherit a class to another? |
| A. | Inherits |
| B. | extends |
| C. | implements |
| D. | import |
| Answer» B. extends | |
| 42. |
The use of final keyword with method definition |
| A. | Supports method overriding |
| B. | implements dynamic method dispatch |
| C. | Prevents method overriding |
| D. | none of these |
| Answer» C. Prevents method overriding | |
| 43. |
Identify the type of inheritance when two or more subclasses inherit the properties of a super class. |
| A. | Multiple inheritance |
| B. | Single inheritance |
| C. | Multilevel inheritance |
| D. | Hierarchical inheritance |
| Answer» D. Hierarchical inheritance | |
| 44. |
The keyword used inside a class to refer to its immediate super class is |
| A. | super |
| B. | parent |
| C. | base |
| D. | none of these |
| Answer» A. super | |
| 45. |
Which of the following is true in the case of abstract class |
| A. | Abstract constructors cannot be created. |
| B. | Abstract classes can not be inherited. |
| C. | An abstract class contains only abstract methods. |
| D. | All of the above. |
| Answer» A. Abstract constructors cannot be created. | |
| 46. |
Which of these keywords are used to define an abstract class? |
| A. | abst |
| B. | abstract |
| C. | Abstract |
| D. | abstract class |
| Answer» B. abstract | |
| 47. |
If a class inheriting an abstract class does not define all of its function then it will be known as? |
| A. | abstract |
| B. | A simple class |
| C. | Static class |
| D. | None of the mentioned |
| Answer» A. abstract | |
| 48. |
Which of these is not a correct statement? |
| A. | Every class containing abstract method must be declared abstract. |
| B. | Abstract class defines only the structure of the class not its implementation. |
| C. | Abstract class can be initiated by new operator. |
| D. | Abstract class can be inherited. |
| Answer» C. Abstract class can be initiated by new operator. | |
| 49. |
Which method defined in Integer class can be used to convert a whole number in string type to primitive int type. |
| A. | valueOf() |
| B. | intValue() |
| C. | parseInt() |
| D. | getInteger() |
| Answer» C. parseInt() | |
| 50. |
The method sqrt() is defined in the class |
| A. | System |
| B. | Root |
| C. | Math |
| D. | Arithmetic |
| Answer» C. Math | |
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