Objective Questions of Data Structure with Answer set-6

1. .......................... is a variable that can hold the address of the variables, structure and functions that are used in the program.

A) Array

B) Pointer

C) Structure

D) None of the above



2. .................. is the organization of the data in a computers memory or in a file.

A) Array

B) Data Structure

C) Data Management

D) Data Organization



3. Which of the following is/are the advantages of using an array?

i) Multi huge quantity of data items can be stored.
ii) Arrays saves the memory space
iii) Arrays helps to arrange the data items in particular order.
iv) Data item searching is faster.

A) i, ii and iii only

B) ii, iii and iv only

C) i, iii and iv only

D) All i, ii, iii and iv



4. Some examples of data structures are

i) array
ii) stack
iii) queue
iv) binary tree
v) hybrid tree

A) i, ii, iii and iv only

B) ii, iii, iv and v only

C) i, ii, iii and v only

D) All i, ii, iii, iv and v



5. Match the following components of data structure based on the concept of Abstract Data Type (ADT) with their definitions.
a) Operations                 i) Organizations of data implemented in lower level data structure.
b) Storage structures     ii) Description on how to manipulate information in the storage structure.
c) Algorithms               iii) Specifies the external appearance of data structure.

A) a-i, b-ii, c-iii

B) a-ii, b-iii, c-i

C) a-iii, b-i, c-ii

D) a-i, b-iii, c-ii



6. Match the following properties of an array with their descriptions.

a) Homogeneous     i) the list size is constant.
b) Ordered              ii) there is a first and last element.
c) Finite                  iii) there is a next and previous in the natural order of the structure
d) fixed-length        iv) every element is the same.

A) a-i, b-ii, c-iii, d-iv

B) a-ii, b-iii, c-iv, d-i

C) a-iii, b-i, c-ii, d-iii

D) a-iv, b-iii, c-ii, d-i



7. Which of the following are linear type of data structure?

i) Linked list
ii) Stack
iii) Binary Tree
iv) Array
v) Queue

A) i, ii, iii and iv only

B) ii, iii, iv and v only

C) i, ii, iv and v only

D) All i, ii, iii, iv and v



8. Which of the following are non linear type of data structure?

i) Tree
ii) Graphs
iii) Hash tables
iv) List

A) i, ii and iii only

B) ii, iii and iv only

C) i, iii and iv only

D) All i, ii, iii and iv




9. State whether the following statements is/are True or False.

i) An ancestor is any node in the path from the root to the node.
ii) A sub-tree is any connected structure below the root.
iii) Binary tree is a directed tree in which out degree of each node is less than or equal to one.
iv) A tree consists of finite set of elements called nodes.
v) Nodes that are not root and not leaf are called intermediate nodes.

A) True, True, True, False, True

B) True, False, True, True, False

C) True, True, True, False, False

D) True, True, False, True, False



10. In a binary search tree the node to be deleted will have two cases which are

i) An empty left sub-tree and non empty right sub-tree and vice versa.
ii) Non empty left sub-tree and right sub-tree.
iii) Empty left sub-tree and right sub-tree.

A) i and ii only

B) ii, and iii only

C) i and iii only

D) None of the above

View Answers:

1. B) Pointer

2. B) Data Structure

3. D) All i, ii, iii and iv

4. A) i, ii, iii and iv only

5. C) a-iii, b-i, c-ii

6. D) a-iv, b-iii, c-ii, d-i

7. C) i, ii, iv and v only

8. A) i, ii and iii only

9. D) True, True, False, True, False

10. A) i and ii only

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MCQ on Core Java with Answers set-1

1. Which exception is thrown by the read( ) method of input stream class?

A) Exception

B) ClassNotFoundException

C) read Exception

D) IOException



2. What garbage collection in the context of java?

A) The operating system periodically deletes all of the java files available on the system.

B) Any package imported in a program and not used in automatically deleted.

C) When all references to an object are gone, the memory used by the object is automatically reclaimed.

D) The JVM checks the output of any Java program and deletes anything that doesn't make sense.



3. In order for a source code file, containing the public class test, to successfully compile, which of the following must be true?

A) It must have a package statement

B) It must be named test.java

C) It must import java.lang

D) It must declare a public class named test.



4. Which of the following are true about the Error and Exception classes?

A) Both classes extend throwable

B) The error class is final and exception class is not.

C) The Exception class is final and the Error is not.

D) Both classes implement Throwable



5. Which of the following are true?

A) The void class extends the class class

B) The float class extends double class

C) The system class extends the runtime class

D) The integer class extends the number class



6. How do you create a Reader object from an InputStream object?

A) Use the static createReader() method of InputStream class

B) Use the static createReader() method of Reader class

C) Create an InputStreamReader object passing the InputStream object an an argument to the InputStreamReader constructor.

D) Create an OutputStreamReader object, passing the InputStream object as an argument to the OutputStreamReader constructor.



7. Which of the following is true?

A) The event inheritance model has replaced the event delegation model

B) The event inheritance model is more efficient than event delegation model

C) The event delegation model uses event listeners to define the methods of event handling classes.

D) The event delegation model uses the handleEvent() method to support event handling.



8. Which of the following is the highest class in the event delegation model?

A) java.util.EventListner

B) java.util.EventObject

C) java.util.AWTEvent

D) java.util.event.AWTEvent



9. When two or more objects are added as listeners for the same event, which listener is first invoked to handle the event?

A) The first object that was added as listner.

B) The last object that was added as listner

C) There is no way to determine which listener will be invoked first.

D) It is impossible to have more than one listener for a given event.



10. Suppose that you want to have an object eh handle the TextEvent of TextArea object t. How should you add eh as the event handler for?

A) t.addTextListener(eh);

B) eh.addTextListner(t);

C) addTextListner(eh.t);

D) addTextListner(t,eh);



11. What is the preferred way to handle an object's events in Java 2?

A) Override the object's handleEvent( ) method.

B) Add one or more event listeners to handle the events

C) Have the object override its process Event( ) methods.

D) Have the object override its dispatch Event( ) methods.



12. Which component method is used to access a component's immediate container?

A) getVisible()

B) getImmediate()

C) getParent()

D) getContainer()



13. Which of the following creates a List with 5 visible items and multiple selection enabled?

A) new List(5, true)

B) new List(true, 5)

C) new List(5, false)

D) new List(false, 5)



14. An Applet has its Layout Manager set to the default of FlowLayout. What code would be the correct to change to another Layout Manager?

A) setLayoutManager(new GridLayout());

B) setLayout(new GridLayout(2,2));

C) setGridLayout(2,2);

D) setBorderLayout();



15. How do you change the current layout manager for a container?

A) Use the setLayout method.

B) Once created you cannot change the current layout manager of a component

C) Use the setLayoutManager method.

D) Use the updateLayout method.



16. Which of the following methods can be used to draw the outline of a square within a JAVA.awt.Component object?

A) drawLine()

B) fillRect()

C) drawPolygon()

D) drawPolygon()



17. State true or false

i) JPanel is a class included in awt package

ii) Anonymous classes are mostly used for event handling

iii) Names of anonymous classes must be unique

iv) JOptionPane is an inner class

A) i-false, ii-false, iii-true, iv-true

B) i-true, ii-false, iii-true, iv-false

C) i-false, ii-true, iii-false, iv-false

D) i-true, ii-true, iii-false, iv-true



18. State true or false

i) Java RMI supports distributed objects written entirely in java

ii) Java RMI makes use of stubs and skeleton

iii) In Java RMI an object registers itself with a media server

iv) IDL is interface declaration language

A) True, True, False, False

B) False, True, True, True

C) True, False, True, False

D) True, True, True, True



19. Match the following

a) Datagram Socket        i) UDP connection

b) URL                           ii) provides necessary framework of debugging java programs

c) java.net                      iii) makes it possible to communicate over a network with java programs

d) sun.tools.debug          iv) is a java object that represent WWW address

A) a-i, b-iv, c-iii, d-ii

B) a-i, b-iv, c-ii, d-iii

C) a-ii, b-iii, c-i, d-iv

D) a-ii, b-i, c-iii, d-iv



20. State true or false

i) public can only be assigned to class

ii) protected protects a statement

iii) protected method is never accessible outside the package

iv) friendly variable may be accessible outside class

A) True, True, False, True

B) False, False, False, True

C) False, True, False, False

D) True, False, False, False


View Answers:

1. D) IOException
2. C) When all references to an object are gone, the memory used by the object is automatically reclaimed
3. B) It must be named test.java
4. A) Both classes extend throwable
5. D) The integer class extends the number class
6. C) Create an InputStreamReader object passing the InputStream object an an argument to the InputStreamReader constructor.
7. C) The event delegation model uses event listeners to define the methods of event handling classes.
8. B) java.util.EventObject
9. C) There is no way to determine which listener will be invoked first.
10. D) addTextListner(t,eh);
11. B) Add one or more event listeners to handle the events
12. C) getParent()
13. A) new List(5, true)
14. B) setLayout(new GridLayout(2,2));
15. A) Use the setLayout method
16. A) drawLine()
17. C) i-false, ii-true, iii-false, iv-false
18. A) True, True, False, False
19. A) a-i, b-iv, c-iii, d-ii
20. A) True, True, False, True

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MCQ on Java Programming Language Fundamental set-12

1. A java program is first ................ and ...................

A) executed, run

B) compiled, run

C) run, compiled

D) interpreted, compiled


2. Byte code is also a ...........

A) machine code

B) bit code

C) cryptographic code

D) none


3. A private class is accessible from inside a .................

A) package

B) class

C) method

D) none


4. Consider the statement "x=(a>b)?a:b", then the value of x is 19, if a=19 and b=12

A) true

B) not supported

C) false

D) none of the above


5. Adapter classes are used for ...............

A) code redundancy

B) code reduction

C) code organization

D) none


6. ..................... inheritance is enable by interface in java.

A) min level

B) multiple

C) low level

D) none


7. .................... is generated if a button is clicked in AWT.

A) ItemEvent

B) WindowEvent

C) ActionEvent

D) MouseEvent


8. Using which keyword we can access value of the instance and class variables of that class inside the method of that class itself.

A) super

B) final

C) this

D) either super or this


9. If a variable is declared FINAL, it must include ......................... value.

A) integer

B) number

C) initial

D) float


10. In java, string is a

A) primitive data type

B) abstract data type

C) combination of boolean

D) None of the above


11. Methods can be overloaded with a difference only in the type of the return value

A) Not supported

B) False

C) True

D) None of the above


12. Each method in a java class must have a unique name

A) Not necessarily

B) True

C) False

D) None of the above


13. It is an important feature of java that it always provides a default constructor to a class

A) Not supported

B) False

C) True

D) None of the above


14. If one or more abstract methods are not implemented in an abstract class, then the subclass is also abstract.

A) Not necessarily

B) False

C) True

D) None of the above


15. Life cycle of an applet is described by .................. methods.

A) six

B) three

C) four

D) five


16. Which of the following is not subclass of "writer" stream.

A) FileWriter

B) LineWriter

C) BufferedWriter

D) PrintWriter


17. In java RMI, stub is located in

A) client machine

B) proxy

C) server

D) none of the above


18. The new keyword will

i) create in instance of an object

ii) create instance of a class

iii) assign memory to an array

iv) call the destructor of a class

A) i and iii

B) ii and iii

C) i and ii

D) ii, iii and iv


19. ODBC stands for

A) Object Data Binding Command

B) Open Database Console

C) Open Database Connectivity

D) Open Database Command


20. Continue statement can be used

i) anywhere inside main method

ii) anywhere inside class

iii) within instance methods

iv) only within looping statements

A) i, ii and iii

B) i and iv

C) only iv

D) ii, iii and iv

Show/Hide Answers:

1. A java program is first ................ and ...................

B) compiled, run

2. Byte code is also a ...........

D) none

3. A private class is accessible from inside a .................

B) class

4. Consider the statement "x=(a>b)?a:b", then the value of x is 19, if a=19 and b=12

A) true

5. Adapter classes are used for ...............

B) code reduction

6. ..................... inheritance is enable by interface in java.

B) multiple

7. .................... is generated if a button is clicked in AWT.

C) ActionEvent

8. Using which keyword we can access value of the instance and class variables of that class inside the method of that class itself.

C) this

9. If a variable is declared FINAL, it must include ......................... value.

C) initial

10. In java, string is a

B) abstract data type

11. Methods can be overloaded with a difference only in the type of the return value

B) False

12. Each method in a java class must have a unique name

A) Not necessarily

13. It is an important feature of java that it always provides a default constructor to a class

C) True

14. If one or more abstract methods are not implemented in an abstract class, then the subclass is also abstract.

C) True

15. Life cycle of an applet is described by .................. methods.

C) four

16. Which of the following is not subclass of "writer" stream.

B) LineWriter

17. In java RMI, stub is located in

A) client machine

18. The new keyword will

i) create in instance of an object

ii) create instance of a class

iii) assign memory to an array

iv) call the destructor of a class

A) i and iii

B) ii and iii

C) i and ii

D) ii, iii and iv

19. ODBC stands for

A) Object Data Binding Command

B) Open Database Console

C) Open Database Connectivity

D) Open Database Command

20. Continue statement can be used

i) anywhere inside main method

ii) anywhere inside class

iii) within instance methods

iv) only within looping statements

C) only iv

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MCQ on Basic SQL Queries with Answers set-1

1. DML is provided for

A) Description of logical structure of database

B) Addition of new structure in the database system.

C) Manipulation & processing of database

D) Definition of physical structure of database system


2.'AS' clause is used in SQL for

A) Selection operation

B) Rename Operation

C) Join operation

D) Projection Operation


3. Count function in SQL returns the number of

A) values

B) distinct values

C) groups

D) columns


4. The statement in SQL which allows to change the definition of a table is

A) Alter

B) Update

C) Cteate

D) Select


5. Which of the following is correct.

A) A SQL query automatically eliminates duplicates

B) SQL permits attribute names to be repeated in the same relation

C) A SQL query will not work if there are no indexes on the relations

D) None of the above


6. Which of the following operation is used if we are interested in only certain columns of a table?

A) PROJECTION

B) SELECTION

C) UNION

D) JOIN


7. Which of the following is a legal expression in SQL?

A) SELECT NULL FROM EMPLOYEE;

B) SELECT NAME FROM EMPLOYEE;

C) SELECT NAME FROM EMPLOYEE WHERE SALARY=NULL;

D) None of the above


8. Which of the following is a valid SQL type?

A) CHARACTER

B) NUMERIC

C) FLOAT

D) All of the above


9. Which command is used to select distinct subject (SUB) from the table (BOOK)?

A) SELECT ALL FROM BOOK

B) SELECT DISTINCT SUB FROM BOOK

C) SELECT SUB FROM BOOK

D) All of the above


10. In SQL, which of the following is not a data definition language commands?

A) RENAME

B) REVOKE

C) GRANT

D) UPDATE

Answers:

1. DML is provided for

C) Manipulation & processing of database

2.'AS' clause is used in SQL for

B) Rename Operation

3. Count function in SQL returns the number of

A) values

4. The statement in SQL which allows to change the definition of a table is

A) Alter

5. Which of the following is correct.

D) None of the above

6. Which of the following operation is used if we are interested in only certain columns of a table?

A) PROJECTION

7. Which of the following is a legal expression in SQL?

B) SELECT NAME FROM EMPLOYEE;

8. Which of the following is a valid SQL type?

D) All of the above

9. Which command is used to select distinct subject (SUB) from the table (BOOK)?

B) SELECT DISTINCT SUB FROM BOOK

10. In SQL, which of the following is not a data definition language commands?

D) UPDATE 

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