C++ objective type question

C++

1) With every use of memory allocation function, what function should be used to release allocate memory which is no longer needed

Unalloc()

Dropmem()

Dealloc()

Free()

2) What is the fundamental use of classes?

Define object

Define a new type &new scope

Make programming easy

Classify the programmers

3) Member function defined inside the class definition, by default is called

Member function

Inline function

Constructor

Parametrized constructed

4) Which is not a valid constructor

Inline

Copy

Default

Parametrized

5) How many private, public, or protected sections can be there in a class

1

2

3

Multiple

6) The member of a class can be

Data

Member function  

Type definition

All of the above

7) Classes with pointer member variable must not

Explicitly overload the assignment operator

Include cop constructor

Include destructor

Use a non member operator function

8) A member function always access the data

In the object of which it is a member

In the class of which it is a member

In any object of class of which it is a member

In the public port of its class

9) when overloading an operator which of these is not true?

Can’t change precedence or associativity

Default arguments can’t be used

Can’t change no of arguments that an operators takes

Can change basic behavior of operator

Unix | shell variables

Shell variables

The shell support variables that are useful both in command line and shell programming .you will deal with three basic variables.

   1.    Positional variables

   2.    Special variables

   3.    Named variables

1) positional variables : on several occasions, you may require the shell programs to accept an arguments from the command line itself . To facilitate this process, positional parameters are provided. Using these parameters you can pass up to nine arguments to the shell programmers from the command line itself. These parameters may be file name, pathname, username, and so on. These parameters are invoked like normal shell variables with a preceding ‘$’sign as $1,$2,-----------------$q. the first arguments specified after the shell program will be assigned to $1, the second to $2 and so on.

Example: 
$ cat>name

 echo ”your first name is” :$1

 echo ”your middle name is” :$2

 echo ”your last name is” :$3

   (Ctrl + d)

    $

2) special variables  : there  are two special parameters that are of special interest to us. They also pertain to arguments specified at the command line.

 

 $ # this parameter returns the number of arguments that are specified on the command line.

Example: 
$ cat>how-many-arguments

Echo ”the number of arguments specified is” :$#

(ctrl + )

$

$ How-many-arguments: just testing this programs.

The number of arguments specified is: 4

$* this parameter, when referenced within the shell programs ,retuen a string with all the parameters with which the shell programs was invoked

Example: 
$ cat>display-args

 Echo “ the args are”: $*

  (Ctrl + d)

    $

$ display args hello word I am except in Unix

The args are : hello word I am except in Unix

3) Named variables: a named variable is a user defined variable that can be assigned the value of named variable can be retrieved by preceding the variable name with a”$” sign

Exampl:
 $myvar=hello

 $ echo $ myvar

   Hello

The first character of a variable name must be a letter or  an underscore. The rest of the name may be composed of letter, digit and underscore combined

neural network

Neural Network(NN)

    1)    which of the following is true?

• On average, NN have higher computation rats than conventional computers
• NN learn by example
• NN mimic the way the human brains work
• All of the above

    2)    associative network is

• A NN that contain no loop
• A NN that contain feedback
• A NN that has only one loop
• None of the above

    3)    preceptron can learn

• AND
• XOR
• A & B
• NO

    4)    preceptron is a

• Feed forward NN
• Back propagation algorithm
• Back tracking algorithm
• Feed forward backward algorithm

    5)    In inputs neurons has weights 1,2,3,4 the transfer function is linear with the constant of proportionality being equal to 2. The inputs are 4,10,5,20 respectivly.the output

• 238
• 345
• 222
• 123

software engineering

SOFTWARE ENGINEERING

1) spiral model developed by?

Ans    Berry Bohem

2) which model is popular for students & projects?

Ans    waterfall model

3) project risk factor is consider under which model?

Ans    Spiral model

4) Build and fix model has how many phase?

Ans    2 phase

5) SDLC stand for?

Ans    Software development model

6) SRS stand for?

Ans    software requirement specification

7) RAD stand for?

Ans    Rapid application development

8) RAD model was purposed by?

Ans    IBM

9) waterfall model is not suitable for?

Ans    complex projects

Java | Static VS Non-Static Nested Classes

Static VS Non-Static Nested Classes

     1.      The instance of static nested class is created without the reference of outer class, which means it does not having enclosing instance

The instance of non-static nested class is created with the reference of object of outer class, in which it has defined , this means it has enclosing instance

    2.      Static nested classes does not need reference of outer class. Non-static nested class requires the outer class reference . you can’t create instance of inner class without creating instance of outer class

   3.      Another difference between static and non-static nested classes is that you can’t access non-static members example: methods and fields into nested static class directly, if you do, you will get error like non-static member can’t be used in static context. While inner class can access both static and non-static no of order classes

If you make a nested class non-static then it also referred as inner class

Class outer

     {

 Private static String message =  ”hello”;

//static nested class

            Private static class MessagePrinter

                        {

//onlystatic member of outer class is directly accessible in nested static class

                        Public void PrintMessage()

                                    {

//compile time error if message field is not static

            System.out.println(“message from nested static class : “ + message);

                                    }

                        }

//non-static nested class also called inner class

            Private class inner

                        {

//both static and non-static member of outer class is accessible in the inner class

                        Public void display()

                                    {

           

System.out.println(“message from non-static nested  class : “ + message);

                                    }

                        }

//create static and non-static nested classes

            Public static void main(String[] args)

                        {

//creating instance of nested static class

            Outer.MessagePrinter printer = new outer. MessagePrinter();

//calling non-static method of nested static class

                        Printer. printMessage();

//creating instance of  non-static nested class

                        Outer.Inner inner = outer.new Inner();

//calling non-static method of inner class

                        Inner.display();

//we can also combine above steps

                        Outer.Inner nonstaticIner = new Outer.new inner();

                        Non-staticIner.display();

                        }

            }

Output :    

                       message from nested static class : hello

                       message from nested static class : hello

operating system | some best practice question

     OPERATING SYSTEM

     1)    Primitive scheduling is the strategy of temporally suspending a running process ?

    Before CPU time slice expires

    To allow starving process to run

    When it request I/O

     2)     which of the following explain the working of OS?

    It is event driven

    It is an object oriented

    It is procedure based system software

     3)    Blocking and caching are the terms associated with which OS functions respectively?

    MM &disk scheduling

    ICOS & disk scheduling

    ICOS & MM

     4)    Applications like banking & reservations required which type of OS?

    Real time

    Hard real time

    Soft real time

5)  which is not a goal of scheduling algorithm for different OS?

    fairness

    Max throughput

    Balance

     6)    Disadvantage of FCFS

    Convey effect

    No preemption

    Simplicity

    7)    what is the duration of time quantum in round robin scheduling?

    10 – 100 ms

    100 – 1000 ms

    1 – 1000 ms  

     8)    which is a valid page replacement policy

    LPU

    PU policy

    onlya

Computer objective type question

  OBJECTIVE TYPE QUESTION   

     1)   Best known example of MAN(metropolitan area network) ?

  Ans  cable tv 

      2)   The number of int between 1 and 250 that are divisible by 2,5,7 is ?  

  Ans   3

      3)   in a broadcast network , a layer that is often thin or non existent is?

             Ans  Network layer

     4)    sql command end with?

            Ans  Semicolon

     5)   Which data structure used to implement recursion?

Ans  Stack

     6)   In BCD adder to add 2 decimal digit needs minimum of?

Ans 5 full adder , 2 half adder

    7)   In order to build mod-18 counter the minimum no. of flip flops needed is equal to?

Ans  5

    8)   The dual of switching fun f=x+yz is given by?

Ans  x(y+z)

     9)   Context free grammar is what type of grammar?

 Ans type 2

operating system | some best practice ouestion

OPERATING SYSTEM

1) Which of the following memory allocation scheme suffer from external fragmentation?

•  Segmentation 
•  swapping
•  Pure demand paging    
•  paging

  

          2)  Resources are allocated to process on non-shareable basis is?

•  Mutual exclusive      
•  hold & wait
•  Non preemption 
•  circular wait

        3) In round robin scheduling as time quantum is increased the average turnaround time?        

•    Increase    
•    Remains constant
•    Decrease      
•    varies irregular

       4) Pool based allocation of memory achieves better usage. Memory can be preempted from inactive         programs & used to accommodate active programs called?

•    Preemption         
•     swapping
•     Spooling   
•     scheduling

    5) What is the example of virtual resources?

•    Print service           
•    virtual machine
•    Virtual memory      
•     All of the above

    6) What of these is/are the desirable feature of OS?

•    Extensible
•    Portable
•    Reliable   
•    All of the above

   7) Which is not a term of describing the collection of operating programs?

•    Monitor         
•    kernel
•    Server           
•    supervisor

   8) Transparency is a feature of which type of OS?

• Batch processing OS  
• Time division 
• Distributed OS   
•  Multiprogramming OS

    9) Program priories, preemption are the key concept of which OS?

•  Batch processing OS
•  Time division OS
•  Distributed OS    
•  Multiprogramming OS

  10) If the disk head is located initially at 32 find number of disk moves required with FCFS if the disk queue of I/O blocks requested are 98,37,14,124,65,67?

•    239 
•    310
•    321 
•    325

 

Java | Anonymous Inner class

Anonymous Inner class

An inner class declared without a class name is known as anonymous inner class. In case of anonymous inner classes we declare and instantiate them at the same time. Generally they are used whenever you need to override the method of a class or an interface.

Anonymous inner classes are declared without any name at all. They are created in two ways.

•     An subclass of specified type

Class demo

   {

      Void show()

           {

                 System.out.println(“show method of super class”);

           }

   }

Class flavour1 demo

    {

//An anonymous class with demo as base class

Static demo d= new demo()

    {

Void show()

       {

                 Super.show();

                  System.out.println(“I am in flavour1 demo class”);

        }

   };

Public static void main(String[] args)

     {

d.show();

      }

}

}

  Output :       

show method of super class    I am in flavour1 demo class

                      

In above code demo act as super class and anonymous class act as a subclass. Both have show() method. In anonymous class show() method is overridden

•      As implementation of specified interface

 Interface hello

      {

             Void show();

       }

Class helloworld

  {

//An anonymous class that implements Hello interface

Static Hello h = new Hello()

    {

          Public void show()

                  {

               System.out.println(“ Anonymous class”);

             }

};

Public static void main(String[] args)

{

h.show();

}

}

 Output :

Anonymous class

                       

In above code we can create an object of anonymous inner class but this anonymous inner class is an implementer of the interface Hello. Any anonymous inner class can implement only one interface at one time. It can either extend a class or implement interface at a time

Advantages of anonymous inner class:

·         Generally an inner class can be easily onverted into a method with anonymous inner class, which helps reduce verbosity

·         The advantage to non-anonymous is that you can resues the clad. I believe the only reason to use an anonymous inner class is brevity

·         One advantage of anonymous inner classes is that no one can ever use it anywhere else, whereas a named inner class can be used.

·         Anonymous inner classes are hard to debug in Eclipse.

·         The key benefit of an anonymous class is encapsulation (or clutter reduction)

Class demo    {

Void show()     

DBMS

DBMS

    Usage of preemption and transaction rollback prevents.

a.     Unauthorized usage of data files

b.     Deadlock situation

c.      Data manipulation

d.     File preemption

Ans. Deadlock situation

    Views are useful for ____ unwanted information and for collecting together information from more than one relation in a single view.

a.     Hiding

b.     Deleting

c.      Highlighting

d.     All above

Ans. Hiding

    The decision tree classifier is widely used technique for.

a.     Classification

b.     Association

c.      Partition

d.     Clusters

Ans. Classification

     Thoma’s write rule is ____.

a.     2-phase locking protocol

b.     1-phase locking protocol

c.      Time stamp ordering protocol

d.     Sliding window protocol

Ans. Time stamp ordering protocol