Java Programming MCQ Solved Paper for SSC Scientific Assistant

1. Which of the following statements are valid array declarations?
A. int number();
B. float average[];
C. double[] marks;
D. counter int[];
Answer : B

2. When the string objects are compared with ==, the result is true If the strings contain the same values.
A. True
B. False
C.
D.
Answer : B

3. In RMI we invoke client method from remote server
A. True
B. False
C.
D.
Answer : B

4. The methods wait() and noify() are defined in
A. java.lang.Thread
B. java.lang.Runnable
C. java.lang.Object
D. java.lang.ThreadGroup
Answer : C

5. The length of a string object 's1' can be obtained using the expression s1.length.
A. True
B. False
C.
D.
Answer : B

6. Connection, Statement are interfaces and ResultSet is a class.
A. True.
B. False.
C.
D.
Answer : B

7. Which of the following keywords are used to control access to a class member?
A. default
B. protected
C. interface
D. None of the above
Answer : B

8. A class may be both abstract and final.
A. True
B. False
C.
D.
Answer : B

9. Throwing an exception always causes program termination.
A. True
B. False
C.
D.
Answer : B

10. It is an error to catch the same type of exception in two different catch blocks associated with a particular try block.
A. True
B. False
C.
D.
Answer : A

11. In the code below, what data types the variable x can have?
A. byte b1 = 5;
B. byte b2 = 10;
C. x = b1 * b2;
D. int short
Answer : D

12. We can over load methods with differences only in their return type.
A. True
B. False
C.
D.
Answer : B

13. Which of the following command lines options generates documentation for all classes and methods?
A. -protected
B. -public
C. -private
D. -encoding
Answer : C

14. All the bitwise operators have the same level of precedence in Java.
A. True
B. False
C.
D.
Answer : A

15. Java always provides a default constructor to a class.
A. True
B. False
C.
D.
Answer : B

16. EJBs can be of the following type(s)
None of the above
A. Entity Bean
B. Session Bean
C. Message-driven bean
D. All of the above
Answer : D

17. To delete a file, we can use an instance of class file.
A. True
B. False
C.
D.
Answer : A

18. All methods in an abstract class must be declared abstract.
A. True
B. False
C.
D.
Answer : B

19. The setBackground() method is part of the class
A. Applet
B. Component
C. Container
D. Object
Answer : B

20. class.forName(...) creates an instance of java ODBC driver
A. True
B. False
C.
D.
Answer : A

21. It is an error to have a method with the same signature in both the super class and its subclass.
A. True
B. False
C.
D.
Answer : B

22. Which exception is thrown by the read() method of InputStream class?
A. IOException
B. FileNotFoundException
C. ReadException
D. None of the above
Answer : A

23. Frames and applets cannot be used together in the same program.
A. True
B. False
C.
D.
Answer : B

24. Servlet has ___________
A. init method
B. doGet(------) method
C. All of the above methods.
D.
Answer : C

25. Every call to wait has a corresponding call to notify that will eventually end the wafting.
A. True
B. False
C.
D.
Answer : A

26. executeUpdate(------------) returns ___________
A. Nothing
B. Returns a ResultSet object
C. Returns an integer value to show the no. of updated rows
D. None of the above.
Answer : C

27. Which of the following represent legal flow control statements?
A. break;
B. break();
C. continue(inner);
D. all of the above
Answer : A

28. Session bean
A. Represents a single client inside the application server
B. Can not be shared
C. Is not persistent
D. Satisfies all of the above conditions
Answer : D

29. The keywords reserved but not used in the initial version of Java re:
A. Synchronized
B. Boolean
C. union
D. goto
Answer : D

30. The name of the RMI compiler is ___________
A. rmicom
B. rmic
C. jrmi
D. none of the above
Answer : B

31. Which key word can protect a class in package from accessibility by the classes outside the package?
A. private
B. protected
C. final
D. don't use any keyword at all(make it default)
Answer : D

32. Every method of a final in class is implicitly final.
A. True
B. False
C.
D.
Answer : A

33. What is java -g used for?
A. Using the jdb tool
B. Executing a class with optimization turned off
C. To provided information about deprecated methods
D. Non of the above
Answer : B

34. DataInput is
A. An abstract class defined is java.io.
B. A class we can use to read primitive data types.
C. An interface that defines methods to open files.
D. An interface that defines methods to read primitive data types.
Answer : D

35. Which of the following statements are true?
A. UTF characters are all 24 bits.
B. Reader class has methods that can read integers and floats.
C. Unicode characters are all 16 bits.
D. all of the above
Answer : C

36. The expression (x == y && a<b) is true If either x == y is true or a<b is true.
A. True
B. False
C.
D.
Answer : B

37. In a single Servlet class we can use____________
A. doGet(...) method only
B. doPost(...) method only
C. doGet(...) method and doPost(...) method both at a time.
D. Either 'a' or 'b'
Answer : C

38. An individual array element that is passed to a method and modified in that method will contain the modified value when the called method completes execution.
A. True
B. False
C.
D.
Answer : B

39. A panel can not be added to another panel.
A. True
B. False
C.
D.
Answer : B

40. In evaluating a logical expression of type 'Boolean expression 1&& Boolean expression 2', both the Boolean expressions are not always evaluated.
A. True
B. False
C.
D.
Answer : A

41. For all insert, update, delete, query operations on a database, ResultSet object creation is mandatory.
A. True.
B. False.
C.
D.
Answer : B

42. One the features of is that an array can store many different types of values.
A. True
B. False
C.
D.
Answer : B

43. Which of the following classes are available in the java.lang package?
A. Random
B. Stack
C. String Buffer
D. Vector
Answer : A

44. Which of the following methods can be used to draw the outline of a square?
A. fillRect()
B. drawLine()
C. drawString()
D. all of the above
Answer : B

45. It is perfectly legal to refer to any instance variable inside of a static method.
A. True
B. False
C.
D.
Answer : B

46. A variable declared inside the for loop control can not be referenced out side the loop.
A. True
B. False
C.
D.
Answer : A

47. It is perfectly legal to assign a subclass object to a supper class reference.
A. True
B. False
C.
D.
Answer : A

48. When we implement an interface method, it should be declared as public.
A. True
B. False
C.
D.
Answer : A

49. Which javadoc tag is used to denote a comment for methods parameters?
A. @method
B. @parameter
C. @argument
D. @param
Answer : D

50. When we implement the Runnable interface, we must define the method
A. start()
B. init()
C. runnable()
D. run()
Answer : D