OOP

Which .NET collection class allows elements to be accessed using a unique key?

If a method is marked as protected internal, who can access it?

Classes that are both in the same assembly and derived from the declaring class

Only methods that are in the same class as the method in question

Internal methods can only be called using reflection

Classes within the same assembly, and classes derived from the declaring class

What is boxing?

Encapsulating an object in a value type

Encapsulating a copy of a value type in an object

Encapsulating a copy of an object in value type

Encapsulating a value type in an object

In Object Oriented Programming, which answer best describes encapsulation?

The conversion of one type of object to another

The runtime resolution of method calls

The exposition of data

The separation of interface and implementation

The capability of an object in Csharp to take number of different forms and hence display behaviour as according is known as:

Encapsulation

Polymorphism

Abstraction

Nheritance

Which of the following keyword is used to change data and behavior of a base class by replacing a member of the base class with a new derived member?

Choose the correct statements about enum used in C#.NET?

An enum variable cannot have a private access modifier

An enum variable can be defined inside a class or a namespace

An enum variable cannot have a protected access modifier

An enum variable cannot have a public access modifier

None of these

What does the following code signify?

Declaration of a base class

Declaration of a sub class

Declaration of base class & sub class and how subclass inherits the base class

Declaration of abstract class

None of the mentioned

In an inheritance chain through which of following, the base class and its components are accessible to the derived class?

Scope resolution operator(:)

Class visibilty modifiers (public,private etc.)

Dot operator (.)

All of the mentioned

Select the class visibility modifiers among the following :

Private, protected, public, internal

ς� Private, protected, public, internal, protected internal

Private, protected, public

Wrong statement about inheritance in C# .NET?

In inheritance chain, object construction begins from base class towards derived class

Inheritance cannot extend base class functionality

A derived class object contains all base class data

Inheritance enables you to create new classes that reuse, extend, and modify the behavior that is defined in other classes.

All of the mentioned

Which of the following functionality is facilitated by inheritance mechanism?

Use the existing functionality of base class

Override the existing functionality of base class

Implements new functionality in derived class

All of the mentioned above

None of the mentioned above

Which statements among following are correct?

We can derive a class from a base class even if source code of base class not available

Multiple inheritance is different from multiple levels of inheritance

It is legal to make objects of one class as members of another class

All of the mentioned above

None of the mentioned above

Which is the correct way to create an object of the given class abc?

Declaring existing class as sealed

Declaring existing class as override

Declaring existing class as overloads

Declaring existing class as shadows

None of these

Given class sample is inherited by class sample 1. Which are the correct statements about construction of object of class sample?

While creating the object firstly the constructor of class sample will be called followed by constructor of class sample 1

The constructor of only sample class will be called

While creating the object firstly constructor of class sample 1 will be called followed by constructor of class sample

The order of calling constructors depend on whether constructors in class sample and sample 1 are private or public

None of these

Which form of inheritance is not supported directly by C# .NET?

Multiple inheritance

Multilevel inheritance

Single inheritance

Hierarchical inheritance

The process of defining two or more methods within the same class that have same name but different parameters list?

Which keyword is used to declare a base class method while performing overidding of base class methods?

The process of defining a method in subclass having same name & type signature as a method in its superclass is known as?

Select the correct statement from the following?

Static methods can be a virtual method

Abstract methods can be a virtual method

When overriding a method, the names and type signatures of the override method must be the same as the virtual method that is being overriden

We can override virtual as well as non virtual methods

None of the mentioned

To override a method in subclass, baseclass method should be defined as?

A type of class which does not have its own objects but acts as a base class for its subclass is known as?

The modifier used to define a class which does not have objects of its own but acts as a base class for its subclass is?

Choose the correct statements among the following:

An abstract method does not have implementation

An abstract method can take either static or virtual modifiers

An abstract method can be declared only in abstract class

All of the mentioned above

None of the mentioned above

Which of these keywords is used to refer to member of base class from a sub class?

Upper

None of the mentioned

This

Base

Which statements are correct?

If a base class consists of a member function fun() and a derived class do not have any function with this name. An object of derived class can access fun().

A class D can be derived from class C, which is derived from class B which in turn is derived from class A.

If a base class and a derived class each include a member function with same name,the member function of the derived class will be called by object of derived class

All of the above mentioned

None of these

Choose the wrong statement about structures in C#.NET?

Structures can be declared within a procedure

Structures can implement an interface but they cannot inherit from another structure

Structure members cannot be declared as protected

A structure cannot be empty

None of the mentioned

When does a structure variable get destroyed?

When no reference refers to it,it will get garbage collected

Depends on whether it is created using new or without new operator

As variable goes out of the scope

Depends on either we free its memory using free() or delete()

None of the mentioned

Select the wrong statements among the following?

A structure can contain constants o

None of the mentioned

A structure can contain constructors

A structure can contain properties o

A structure can contain protected data memb

Choose the correct statement about structures as to why they are defined as value types but not reference types?

Since space required for structure variables is allocated on stack which is a form of memory that is automatically available when a variable to be used is in scope.

Structures generally are used to represent user defined data types that consists of small amount of data in them.Hence using stack for declaration of such variables is not a problem.

All of the mentioned

None of the mentioned

Choose the correct statement among the following which supports the fact that C# does not allow the creation of empty structures?

C#.NET supports creation of abstract user-defined data types using structures

By having empty structures,it would mean that the new data types have no data associated with, which does not make any sense in C#.NET

Basic reason to create structures is the inability to represent real life objects using standard data types offered by the language

All of the above mentioned

Choose the wrong statement about ‘INTERFACE’ in C#.NET?

Interfaces are declared public automatically

An explicitly implemented member could be accessed from an instance of the interface

An interface could not contain signature of the indexer

None of the mentioned

Which among the following is not an interface declared in System.Collection namespace?

IDictionaryComparer

Icomparer

IEnumerato

IEnumerable

Which is the correct statement about an ArrayList collection that implements the IEnumerable interface?

To access members of ArrayList from the inner class, it is necessary to pass ArrayList class’s reference to it

The inner class of ArrayList can access ArrayList class’s members

The ArrayList class consist of inner class that implements the IEnumerator interface

All of the mentioned

Which among the given statements are correct about the Stack collection?

It can be used for evaluation of expressions

It is used to maintain a LIFO list

Top most element of the Stack collection can be accessed using the Peek()

All of the mentioned

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