WIPRO

QUESTIONS ASKED IN TECHNICAL INTERVIEW:
1.Design a zenerdiode circuit providing constant voltage output? he gave me pen and paper....
i tried but i couldnot remember at that time......i just draw a zener diode and tried for sometime. then told sir i cant remember..... even though my first qn was tough.,,,am not get nervoused,i kept my smiling face.
2.Favourite subject?
i told digital electronics....
3.what is a flipflop?
i told it is a memory element.....
4what are the memories available in market
i told RAM and ROM
5what are the different types of RAMs ?
static and dynamic RAM
6what are they?
7.fn code for factorial of a number?
8.pgm to check for paliandrome?
9.what is smith chart?
10 thevenins theorem?
11.kirchoffs law?
12 relate them?
13.jk master slave flipflop?


C-Questions
 Q1) What do you know about networking support in Java ?
    Ans:      Java supports "low-level" and "high-level" classes. "Low-level" classes provide support for socket programming: Socket, DatagramSocket, and ServerSoc
Q2) What is the difference between structures and classes in C++? 
      Ans: There is only one difference , in classes the members are private by default whereas it is not so in structures.5. which are things not supported by java? struct, multiple inheritence, pointers
Q3) What are the main differences between Java and C++? 
     Ans:  Everything is an object in Java (Single root hierarchy as everything gets derived from java. lang. Object). Java does not have all the complicated aspec
Q4) How do you achieve multiple inheritance in Java?                   Ans: A
A) Using interfaces. B) Using abstract classes C) Using final classes D) None of the above
Q5) Which java. util classes and interfaces support event handling 
                 Ans: The EventObject class and the EventListener interface support event processing.
Q6)printf() Function
What is the output of printf("%d")? 
Ans: 1. When we write printf("%d",x); this means compiler will print the value of x. But as here, there is nothing after �%d� so compiler will show in output window garbage value. 
Q7)What is the difference between "calloc(...)" and "malloc(...)"?
 Ans: 1. calloc(...) allocates a block of memory for an array of elements of a certain size. By default the block is initialized to 0. The total number of memory allocated will be (number_of_elements * size). 
malloc(...) takes in only a single argument which is the memory required in bytes. malloc(...) allocated bytes of memory and not blocks of memory like calloc(...). 
Q8)What is the difference between "printf(...)" and "sprintf(...)"? 
sprintf(...) writes data to the character array whereas 
printf(...) writes data to the standard output device. 
Q9)Compilation How to reduce a final size of executable? 
Ans: Size of the final executable can be reduced using dynamic linking for libraries. 
Q10)What will be printed as the result of the operation below:

main()
{
int x=20,y=35;
x=y++ + x++;
y= ++y + ++x;
printf(“%d%d\n”,x,y)
; }                                                      Ans : 5794     

Q11)What will be printed as the result of the operation below:
main()
{
char s1[]=“Tech”;
char s2[]= “preparation”;
printf(“%s”,s1)
; } 

Ans: Tech 
Q12)
main()
{
int x=10, y=15;
x = x++;
y = ++y;
printf(“%d %d\n”,x,y);

}

Ans: 11, 16 

Q13)What will be printed as the result of the operation below:
main()
{
int a=0;
if(a==0)
printf(“Tech Preparation\n”);
printf(“Tech Preparation\n”);

}
Ans: Two lines with “Tech Preparation” will be printed. 
Q14)What will the following piece of code do
int f(unsigned int x)
{
int i;
for (i=0; x!0; x>>=1){
if (x & 0X1)
i++;
}
return i;
}
Ans: returns the number of ones in the input parameter X 
Q15)What does static variable mean? 
 Ans: there are 3 main uses for the static.
1. If you declare within a function:
It retains the value between function calls

2.If it is declared for a function name:
By default function is extern..so it will be visible from other files if the function declaration is as static..it is invisible for the outer files 

3. Static for global variables:
By default we can use the global variables from outside files If it is static global..that variable is limitied to with in the file 

Q16)What is the difference between a string copy (strcpy) and a memory copy (memcpy)? When should each be used? 
  Ans: The strcpy() function is designed to work exclusively with strings. It copies each byte of the source string to the destination string and stops when the terminating null character () has been moved. On the other hand, the memcpy() function is designed to work with any type of data. Because not all data ends with a null character, you must provide the memcpy() function with the number of bytes you want to copy from the source to the destination. 

Q17)Why n++ executes faster than n+1? 
Ans: The expression n++ requires a single machine instruction such as INR to carry out the increment operation whereas, n+1 requires more instructions to carry out this operation. 
Q18)What is static memory allocation and dynamic memory allocation? 
Static memory allocation: The compiler allocates the required memory space for a declared variable.By using the address of operator,the reserved address is obtained and this address may be assigned to a pointer variable.Since most of the declared variable have static memory,this way of assigning pointer value to a pointer variable is known as static memory allocation. memory is assigned during compilation time. 
Dynamic memory allocation: It uses functions such as malloc( ) or calloc( ) to get memory dynamically.If these functions are used to get memory dynamically and the values returned by these functions are assingned to pointer variables, such assignments are known as dynamic memory allocation. memory is assined during run time. 
Q19)How are pointer variables initialized? 
Ans:Pointer variable are initialized by one of the following two ways 
- Static memory allocation 
- Dynamic memory allocation 
Q20)Difference between arrays and pointers? 
- Pointers are used to manipulate data using the address. Pointers use * operator to access the data pointed to by them 
- Arrays use subscripted variables to access and manipulate data. Array variables can be equivalently written using pointer expression.

Q21)Is NULL always defined as 0? 
Ans:NULL is defined as either 0 or (void*)0. These values are almost identical; either a literal zero or a void pointer is converted automatically to any kind of pointer, as necessary, whenever a pointer is needed (although the compiler can’t always tell when a pointer is needed). 

Q22)What is the difference between NULL and NUL? 
Ans: NULL is a macro defined in for the null pointer. 
NUL is the name of the first character in the ASCII character set. It corresponds to a zero value. There’s no standard macro NUL in C, but some people like to define it. 
The digit 0 corresponds to a value of 80, decimal. Don’t confuse the digit 0 with the value of ‘’ (NUL)! NULL can be defined as ((void*)0), NUL as ‘’. 
Q23)Can the sizeof operator be used to tell the size of an array passed to a function? 
Ans: No. There’s no way to tell, at runtime, how many elements are in an array parameter just by looking at the array parameter itself. Remember, passing an array to a function is exactly the same as passing a pointer to the first element. 
Q24)Is using exit() the same as using return? 
Ans: No. The exit() function is used to exit your program and return control to the operating system. The return statement is used to return from a function and return control to the calling function. If you issue a return from the main() function, you are essentially returning control to the calling function, which is the operating system. In this case, the return statement and exit() function are similar. 

Q25)Can math operations be performed on a void pointer? 
No. Pointer addition and subtraction are based on advancing the pointer by a number of elements. By definition, if you have a void pointer, you don’t know what it’s pointing to, so you don’t know the size of what it’s pointing to. If you want pointer arithmetic to work on raw addresses, use character pointers. 

Q26)Are pointers integers? 
No, pointers are not integers. A pointer is an address. It is merely a positive number and not an integer. 

Q27)What is a method? 
Method is a way of doing something, especially a systematic way; implies an orderly logical arrangement (usually in steps). 
Q28)What is the difference between declaring a variable and defining a variable?
Declaring a variable means describing its type to the compiler but not allocating any space for it. Defining a variable means declaring it and also allocating space to hold the variable. You can also initialize a variable at the time it is defined. 
Q29)What does it mean when a pointer is used in an if statement? 
Any time a pointer is used as a condition, it means “Is this a non-null pointer?” A pointer can be used in an if, while, for, or do/while statement, or in a conditional expression. 
Q30)Differentiate between an internal static and external static variable? 
A internal static variable is declared inside a block with static storage class whereas an external static variable is declared outside all the blocks in a file. An internal static variable has persistent storage,block scope and no linkage.An external static variable has permanent storage,file scope and internal linkage. 

Q31)What is the difference between a string and an array?
An array is an array of anything. A string is a specific kind of an array with a well-known convention to determine its length. 

Q32)storage class? 
Advantages of external storage class
1)Persistent storage of a variable retains the latest value
2)The value is globally available
Disadvantages of external storage class
1)The storage for an external variable exists even when the variable is not needed
2)The side effect may produce surprising output
3)Modification of the program is difficult
4)Generality of a program is affected 
Q33)What is storage class and what are storage variable ? 
A storage class is an attribute that changes the behavior of a variable. It controls the lifetime, scope and linkage.
There are five types of storage classes
1) auto 
2) static 
3) extern 
4) register 
5) typedef 
Q34)What is a static function? 
A static function is a function whose scope is limited to the current source file. Scope refers to the visibility of a function or variable. If the function or variable is visible outside of the current source file, it is said to have global, or external, scope. If the function or variable is not visible outside of the current source file, it is said to have local, or static, scope. 
Q35)What is a pointer variable?
A pointer variable is a variable that may contain the address of another variable or any valid address in the memory. 
Q36)What is a pointer value and address? 
A pointer value is a data object that refers to a memory location. Each memory locaion is numbered in the memory. The number attached to a memory location is called the address of the location.
Q37)What is a modulus operator? What are the restrictions of a modulus operator? 
A Modulus operator gives the remainder value. The result of x%y is obtained by (x-(x/y)*y). This operator is applied only to integral operands and cannot be applied to float or double.
Q38)What is a function and built-in function? 
A large program is subdivided into a number of smaller programs or subprograms. Each subprogram specifies one or more actions to be performed for a large program. such subprograms are functions.
The function supports only static and extern storage classes. By default, function assumes extern storage class.functions have global scope. Only register or auto storage class is allowed in the function parameters. Built-in functions that predefined and supplied along with the compiler are known as built-in functions. They are also known as library functions.
Q39)When should a type cast not be used? 
A type cast should not be used to override a const or volatile declaration. Overriding these type modifiers can cause the program to fail to run correctly. 
A type cast should not be used to turn a pointer to one type of structure or data type into another. In the rare events in which this action is beneficial, using a union to hold the values makes the programmer’s intentions clearer. 
Q40)What is Difference Between C/C++
C does not have a class/object concept.
C++ provides data abstraction, data encapsulation, Inheritance and Polymorphism.
C++ supports all C syntax.
In C passing value to a function is "Call by Value" whereas in C++ its "Call by Reference"
File extension is .c in C while .cpp in C++.(C++ compiler compiles the files with .c extension but C compiler can not!)
In C structures can not have contain functions declarations. In C++ structures are like classes, so declaring functions is legal and allowed.
C++ can have inline/virtual functions for the classes.
c++ is C with Classes hence C++ while in c the closest u can get to an User defined data type is struct and union.
Q41)In C, what is the difference between a static variable and global variable? 
A static variable declared outside of any function is accessible only to all the functions defined in the same file (as the static variable). However, a global variable can be accessed by any function (including the ones from different files). 


C++ -Questions
Q1)What is function overloading and operator overloading?
Function overloading: C++ enables several functions of the same name to be defined, as long as these functions have different sets of parameters (at least as far as their types are concerned). This capability is called function overloading. When an overloaded function is called, the C++ compiler selects the proper function by examining the number, types and order of the arguments in the call. Function overloading is commonly used to create several functions of the same name that perform similar tasks but on different data types. 
Operator overloading allows existing C++ operators to be redefined so that they work on objects of user-defined classes. Overloaded operators are syntactic sugar for equivalent function calls. They form a pleasant facade that doesn't add anything fundamental to the language (but they can improve understandability and reduce maintenance costs). 
Q2)What is the difference between declaration and definition? 
Ans: The declaration tells the compiler that at some later point we plan to present the definition of this declaration.
E.g.: void stars () //function declaration 
The definition contains the actual implementation.
E.g.: void stars () // declarator
{
for(int j=10; j > =0; j--) //function body
cout << *;
cout << endl; } 

Q3)What are the advantages of inheritance? 
Ans: It permits code reusability. Reusability saves time in program development. It encourages the reuse of proven and debugged high-quality software, thus reducing problem after a system becomes functional. 

Q4)Write a short code using C++ to print out all odd number from 1 to 100 using a for loop 
for( unsigned int i = 1; i < = 100; i++ )
if( i & 0x00000001 )
cout << i << \",\";

Q5)What is public, protected, private? 
Ans: Public, protected and private are three access specifier in C++. 
Public data members and member functions are accessible outside the class. 
Protected data members and member functions are only available to derived classes. 
Private data members and member functions can’t be accessed outside the class. However there is an exception can be using friend classes.



Q6)Write a function that swaps the values of two integers, using int* as the argument type. 
void swap(int* a, int*b) {
int t;
t = *a;
*a = *b;
*b = t;
}
Q7)What are the advantages of inheritance?

• It permits code reusability.
• Reusability saves time in program development.
• It encourages the reuse of proven and debugged high-quality software, thus reducing problem after a system becomes functional.
Q8)What is the difference between an ARRAY and a LIST?
            Array is collection of homogeneous elements.
            List is collection of heterogeneous elements. 
Q9)What is encapsulation? 
Ans: Packaging an object’s variables within its methods is called encapsulation. 
Q10)What is an object? 
Ans: Object is a software bundle of variables and related methods. Objects have state and behavior. 
Q11)What do you mean by inheritance? 
Inheritance is the process of creating new classes, called derived classes, from existing classes or base classes. The derived class inherits all the capabilities of the base class, but can add embellishments and refinements of its own.
Q12)What is namespace? 
Namespaces allow us to group a set of global classes, objects and/or functions under a name. To say it somehow, they serve to split the global scope in sub-scopes known as namespaces.
Q13)What is Boyce Code Normal form? 
A relation schema R is in BCNF with respect to a set F of functional dependencies if for all functional dependencies in F+ of the form a-> , where a and b is a subset of R, at least one of the following holds:
* a- > b is a trivial functional dependency (b is a subset of a)
* a is a superkey for schema R
Q14)What is virtual class and friend class? 
Friend classes are used when two or more classes are designed to work together and need access to each other's implementation in ways that the rest of the world shouldn't be allowed to have. In other words, they help keep private things private. For instance, it may be desirable for class DatabaseCursor to have more privilege to the internals of class Database than main() has. 
Q15)What is the word you will use when defining a function in base class to allow this function to be a polimorphic function? 
Ans: virtual
Q16)What do you mean by binding of data and functions? 
  Ans: Encapsulation.
Q17)What is the difference between an object and a class? 
A Class is static. All of the attributes of a class are fixed before, during, and after the execution of a program. The attributes of a class don't change.
- The class to which an object belongs is also (usually) static. If a particular object belongs to a certain class at the time that it is created then it almost certainly will still belong to that class right up until the time that it is destroyed.
- An Object on the other hand has a limited lifespan. Objects are created and eventually destroyed. Also during that lifetime, the attributes of the object may undergo significant change. 
Q18)Suppose that data is an array of 1000 integers. Write a single function call that will sort the 100 elements data [222] through data [321]. 
Ans: quicksort ((data + 222), 100);
Q19)What is a class? 
Class is a user-defined data type in C++. It can be created to solve a particular kind of problem. After creation the user need not know the specifics of the working of a class.
Q20)What is friend function? 
As the name suggests, the function acts as a friend to a class. As a friend of a class, it can access its private and protected members. A friend function is not a member of the class. But it must be listed in the class definition. 
Q21)Which recursive sorting technique always makes recursive calls to sort subarrays that are about half size of the original array? 
Mergesort always makes recursive calls to sort subarrays that are about half size of the original array, resulting in O(n log n) time. 
Q22)What is abstraction? 
Ans:Abstraction is of the process of hiding unwanted details from the user. 
Q23)What is a scope resolution operator? 
Ans:A scope resolution operator (::), can be used to define the member functions of a class outside the class. 

QUTIONS ON JAVA
Q1)what is the difference between statis block and static variable?
ANS:Static block is the block which is executed first in the 
program. Static variable is the common variable which is 
shared by all the objects. Static variable is not specific 
to any object.

Q2)why java does not support multiple inheritance
Ans:Java absolutly support multiple inheritence in terms of 
Interface.We can extend one class only to avoid ambiguity 
problem.In interface we have to define the functions.So we 
don't get any ambiguity.In c++ it is big problem with 
multiple inheritence but in JAVA this thing is improved by 
introducing Interfaces
Q3)What is the difference between an Applet and an Application?
Ans:1. Applets can be embedded in HTML pages and downloaded over the Internet whereas 
Applications have no special support in HTML for embedding or downloading. 

Q4)What are the Applet's Life Cycle methods? Explain them?
Ans:init() method - called when an applet is first loaded. This method is called only once in the entire cycle of an applet. This method usually intialize 
the variables to be used in the applet 

start() method - called each time an applet is started 

paint() method - called when the applet is minimized or refreshed. This method is used for drawing different strings, figures, and images on the applet 
window 

stop() method - called when the browser moves off the applet’s page 

destroy() method - called when the browser is finished with the appl
Q5)What is the sequence for calling the methods by AWT for applets? 
Ans:init() 
start() 
paint() 
When an applet is terminated, the following sequence of method calls takes place 
stop() 
destroy()
Q6)Which classes and interfaces does Applet class consist?
Ans: Applet class consists of a single class, the Applet class and three interfaces: AppletContext, AppletStub, and AudioClip
Q7)What is the purpose of HTTP tunneling?
Ans:HTTP tunneling is used to encapsulate other protocols within
the HTTP or HTTPS protocols. It is typically used to pass
protocols that would normally be blocked by a firewall
through the firewall in a controlled manner.
Q8)How does JDBC differ from ODBC?
Ans:ODBC is the industry-standard interface by which database
clients connect to database servers. 

JDBC is a pure Java solution that does not follow the ODBC
standard. 

However, there is a bridge between JDBC and ODBC that allows
JDBC to access databases that support ODBC.
Q9)what is servlet life cycle?
Ans:The three important functions that implement the life cycle 
of servlet are init(),service(),destroy().
    When a client/user specifies a request by entering the 
URL in the browser the browser generates an HTTP request 
for it and sends to the server.
    On receiving the HTTP request the server maps a servlet 
to this request. the servlet is then dynamically retrieved 
and loaded in the memory.
    The server now calls the init() method of the servlet. 
Parameters can be sent to configure the servlet. This 
method is called only once when the servlet is first 
loaded.    
    When a request arrives for this servlet the server 
invokes the service() method. this is the method which 
handles all the HTTP requests and formulates HTTP response. 
For every request service() method is called.
     When the server decides to unload the servlet it calls 
the destroy() method. Any resources which were used by the 
servlet or any open files or any database connections can 
be restored so that the memory used by these objects and 
the servlet can then be garbage collected.
Q10)What is the content of the Java 2 security policy file?
Ans:The security policy file contains a series of grant entries
that identify the permissions granted to an applet or
application based on its source and signatures.
Q11)what is diff string and stringbuffer
Ans: string is immutable, that is it can not be extended.whereas
StringBuffer is mutable and can be extended.
Fro example :
  Consider 2 statement : "Welcome "  and "to Java World".
 now assign first statement to string and string buffer.
  String str = "Welcome" & StringBuffer strBuff = new
StringBuffer("Welcome");
  Now if we add 2nd statement to both then :
  str= str + "to Java World" -> In this case, it would dump
all the memory allocated with "welcome" and allocate a new
memory space to the entire string "Welcome to Java World"  .
On the other hand, in strBuff  :-
  strBuff.append("to Java World") -> if simply allocate a
new memory space to only 2nd statement and add to link to
previous name.
Q12)what is the difference between statis block and static variable
Ans:Static block is the block which is executed first in the 
program. Static variable is the common variable which is 
shared by all the objects. Static variable is not specific 
to any object.
Q13)what does a constructor does.
Ans:Constructor is a member function of class that is used to
create objects of that class.

we can also intialise instance variables.
Q14)How is database middleware used to access legacy databases?
Ans: Database middleware enables legacy databases to be accessed
from Java by translating between JDBC and the drivers that are
supported by the legacy databases.

Q15)How do you create Connection?
Ans:After loading the driver in order to refer the what kind of 
database u communicate we Establish the connection with the 
help of a static method called GETCONNECTION this is from 
DRIVER MAMAGER.GETCONNECTION. accepting arguments as JDBC 
URL ,USER NAME , PASSWORD
  EX: DriverManager.getConnection
("jdbc:odbc:sid","scott","tiger");
     here jdbc,odbc,sid ->  is  url   and sid is service id.
     scott - > is user name.
     tiger - > is password.
Q16)In JDBC, All the API’s are interfaces? Where is the actual implementation?
Ans:JDBC accomplishes its goals through a set of Java 
interfaces, each implemented differently by individual 
vendors. The set of classes that implement the JDBC 
interfaces for a particular database engine is called a 
JDBC driver. In building a database application, you do not 
have to think about the implementation of these underlying 
classes at all; the whole point of JDBC is to hide the 
specifics of each database and let you worry about just 
your application
Q17)What are different types of transactions?
Ans:There are 3 different type of transactions:
1)Autocommit(default)
2)Explicit
3)Implicit
Q18)what is CallableStatement and what is its usage?
Ans:Callable statement is the one of the SQL statement. 
Callable statement usage, to execute stored procedures 
using preparecall() method.
Q19)What is Statement and PreparedStatement? whatz the difference?
Ans:When you execute a SQL query with Statement.  It parses and 
executes in the database each time.  Where as in 
PreparedStatement, first time it parses and executes and 
subsequent times, it directly substitute the values in the 
query and executes.  It is faster than Statement
Q20)What is meant by a ResultSet?
Ans:A Resultset is a pointer pointing to the data retrieved 
into database buffer.Hence for this reason,Resultset object 
exist only as long as client connected with database.
-Resultset maintains cursor pointing to each record 
retrieved into DB buffer.
-its cursor position starts from 'before first record' 
to 'after last record' .
-Resultset allows unidirectional navigation and also allows 
us to retrieve data only once in the life span of the 
object.
Q21)What type of drivers are used for web application?
Ans:type-3 drivers thatis IntermediateDataAccess Driver
Q22)What type of driver you use in real-time projects?
Ans:We can use the type-4 driver in Real-Time Projects
Q23)What are stored procedures? How to call them?
Ans:Stored procedures are stored programs in jdbc.pl/sql is a 
stored procedure.they can be called from java by callable 
statement.
CallableStatement st=con.prepareCall("{----}");

HR INTERVIEW:
Q1.Tell about your family background?
Q2. Why do you like to join in Wipro?
it is one of leading and top most company of India and its my ambition.
Q3.What do you know about Wipro?
Q4. Why should I hire you?
First learn about the position for which you are applying. 
Then, correlate your qualification and experience with that.
So, you can say, u require _____ skill set or tools, I have __ years exp in that tools. So I would definitely be a good resource for WIRO if you select me. As I was in this process, I know about these tools.
Q5.What are your achievements?
Q6.Do you have any question to ask?
For this question, the answer should not about your salary and money matter. It must be like.. Please tell me about the training that i am given during the training period and when shall i join.. this gives the positive impression. 
Q7.How would you manage stress at job?
        I would see to that i meet up the deadlines on time and if possible even earlier than the deadlines.... so i wouldn't have to feel the stress.
                                                            (or)
When i start to feel stress coming on, immediately try relaxing the muscles and fill my mind with thoughts of peace, tranquility, confidence, strength, happiness. Repeat these and other calming words to myself now and again. Take notice of, and enjoy my surroundings all through the day. Look at, listen to, smell the limitless variety of things natural everywhere
Q8.where do you see your self after three years?
During the next two years I will enhance my skills as a software developer and after that I will plan to reach at the top managerial level in the next 5 years.
                              (or)
i am a fast learner,i would see myself as a project leader in the next three years .
Q9.Why you are applying for this post? or What qualities do you have for applying for this job?
i apply for this post becoz i have a selfconfidence.

To help solve a difficult problem or to cut down on worrying about making a decision, analyze the situation, determine what must be done and carry it out in our company.

Q10.As you are a Non-IT student why are you preferring IT field only?Please give me valuable suggestions
INTERVIEW TIPS:
Entering the room
Prior to the entering the door, adjust your attire so that it falls well.
Before entering enquire by saying, “May I come in sir/madam”.
If the door was closed before you entered, make sure you shut the door behind you softly.
Face the panel and confidently say ‘Good day sir/madam’.
If the members of the interview board want to shake hands, then offer a firm grip first maintaining eye contact and a smile.
Seek permission to sit down. If the interviewers are standing, wait for them to sit down first before sitting.
An alert interviewee would diffuse the tense situation with light-hearted humor and immediately set rapport with the interviewers.

Enthusiasm
The interviewer normally pays more attention if you display an enthusiasm in whatever you say.
This enthusiasm come across in the energetic way you put forward your ideas.
You should maintain a cheerful disposition throughout the interview, i.e. a pleasant countenance hold s the interviewers interest.

Humor
A little humor or wit thrown in the discussion occasionally enables the interviewers to look at the pleasant side of your personality,. If it does not come naturally do not contrive it.
By injecting humor in the situation doesn’t mean that you should keep telling jokes. It means to make a passing comment that, perhaps, makes the interviewer smile.

Eye contact
You must maintain eye contact with the panel, right through the interview. This shows your self-confidence and honesty.
Many interviewees while answering, tend to look away. This conveys you are concealing your own anxiety, fear and lack of confidence.
Maintaining an eye contact is a difficult process. As the circumstances in an interview are different, the value of eye contact is tremendous in making a personal impact.
Be natural
Many interviewees adopt a stance which is not their natural self.
It is amusing for interviewers when a candidate launches into an accent which he or she cannot sustain consistently through the interview or adopt mannerisms that are inconsistent with his/her personality.
Interviewers appreciate a natural person rather than an actor.
It is best for you to talk in natural manner because then you appear genuin


QUESTIONS TO ASK TO HR:
1.What kinds of assignments might I expect the first six months on the job? 
2.How often are performance reviews given?
3.Please describe the duties of the job for me.
4.What products (or services) are in the development stage now? 
5.What are your growth projections for next year? 
6.Does your company encourage further education?
7.Do you offer flextime? 
8.What is the usual promotional time frame? 
9Does your company offer either single or dual career-track programs? 
10.What do you like best about your job/company? 
11.Do you fill positions from the outside or promote from within first?
12.Is this a new position or am I replacing someone? 
13.May I talk with the last person who held this position?
14.What qualities are you looking for in the candidate who fills this position? 
15.What skills are especially important for someone in this position? 
16.What characteristics do the achievers in this company seem to share? 
17.Who was the last person that filled this position, what made them successful at it, where are they today, and how may I contact them?
18.Will I have the opportunity to work on special projects? 
19.Where does this position fit into the organizational structure? 
20.What is the next course of action? When should I expect to hear from you or should I contact you?