Object-Oriented Programming Solved Exam Questions
Course Introduction
Object-Oriented Programming introduces the fundamental concepts and principles of object-oriented design and development. The course covers topics such as classes, objects, inheritance, polymorphism, encapsulation, and abstraction, with a focus on applying these concepts using programming languages like Java or C++. Students will learn how to design modular and reusable software systems, implement relationships between objects, and utilize standard libraries. Through hands-on assignments and projects, students will develop practical programming skills and gain experience in solving real-world problems using the object-oriented paradigm.
Recommended Textbook
Visual C# How to Program 6th Edition by Paul J. Deitel
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Chapter 1: Introduction to Computers, the Internet and Visual C#
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Q1) Web-based applications can be distrib uted to a great variety of devices from cell phones to desktop computers using theNET platform.
A)True
B)False
Answer: True
Q2) Every computer can be divided into 6 basic units.They are:
A) monitor, mouse, keyboard, hard drive, processor and disk drives.
B) input, output, primary storage, secondary storage, memory and ALU.
C) input, output, memory, ALU, CPU and secondary storage.
D) input, output, primary storage, secondary storage, CPU, memory.
Answer: C
Q3) C++ "spruces up" C with object-oriented programming capabilities.
A)True
B)False
Answer: True
Q4) Logical decisions are made by the CPU.
A)True
B)False
Answer: False
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Chapter 2: Dive Into Visual Studio Community
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Sample Questions
Q1) A is a window used to communicate with users.
A) form
B) control
C) dialog
D) None of the above.
Answer: C
Q2) The Solution Explorer window provides access only to certain files in the solution.
A)True
B)False
Answer: False
Q3) Dragging and dropping predefined building blocks into place is part of visual programming in C#.
A)True
B)False
Answer: True
Q4) Autohide enables the tool box to shrink down to the edge of the screen.
A)True
B)False
Answer: True
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Chapter 3: Introduction to C# Apps
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Sample Questions
Q1) Only some C# programs contain class definitions.
A)True
B)False Answer: False
Q2) The fractional part in integer division is stored in a variable declared automat ically at run-time.
A)True
B)False Answer: False
Q3) A single line comment in C# begins with:
A) */
B) #
C) //
D) \\ Answer: C
Q4) "\" is known as an escape sequence.
A)True
B)False Answer: False
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Chapter 4: Introduction to Classes,Objects,Methods and Strings
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Sample Questions
Q1) Type ________ is designed to precisely represent numbers with decimal points,especially monetary amounts.
A) digit
B) decimal
C) float
D) double
Q2) The Windows culture settings on the user's machine determine the format for displaying currency amounts,such as the commas vs.periods for separating thousands,millions,etc.
A)True
B)False
Q3) You should think of a C# class's attributes as instance variables.
A)True
B)False
Q4) Method ReadLine reads a whole line,including all the characters the user types up to and including the newline that the user typed by pressing Enter.
A)True
B)False
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Chapter 5: Control Statements: Part 1
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Sample Questions
Q1) Which statement is false
A) To ensure that the operands are of the same type, C# performs implicit conversion on selected operands.
B) Cast operators are unary operators.
C) Cast operators associate from right to left and are one level lower than the multiplicative operators.
D) Cast operators are formed by placing parentheses around the name of a type.
Q2) Which of the following terms is not used to refer to a sentinel value that breaks out of a while statement
A) signal value
B) break value
C) dummy value
D) flag value
Q3) is C#'s only ternary operator.
A) *
B)\(?:\)
C) =
D) //
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Chapter 6: Control Statements: Part 2
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Sample Questions
Q1) Which of the following statements about the continue statement is true
A) The continue statement is used to exit a repetition statement early and continue execution after the loop.
B) The continue statement is used to continue after a switch statement.
C) The continue statement does not alter the flow of control.
D) A continue statement proceeds with the next iteration of the immediately enclosing while, for, do while statement.
Q2) Only the statements for one case can be executed in any one execution of a switch statement.
A)True
B)False
Q3) Counting loops should be controlled with whatever data type most closely reflects the operations taking place,whether that is an int,float or double.
A)True
B)False
Q4) The && operator has higher precedence than the || operator.
A)True
B)False
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Chapter 7: Methods: a Deeper Look
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Sample Questions
Q1) The Math class provides only methods.
A)True
B)False
Q2) To compare a simple-type value to the underlying value of an enumeration constant,you must use a cast operator to make the two types match.
A)True
B)False
Q3) To access the class's non-static members,a static method must use a reference to an object of the class.
A)True
B)False
Q4) A recursive method knows directly how to solve only the base case.
A)True
B)False
Q5) Methods can return at most one value.
A)True
B)False
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Chapter 8: Arrays;Introduction to Exception Handling
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Sample Questions
Q1) The first element in every array is the 0th element.
A)True
B)False
Q2) The index of an array must be an integer;it cannot include variables or expres sions.
A)True
B)False
Q3) By convention,the first set of brackets of a two-dimensional array identifies an element's column and the second identifies the row.
A)True
B)False
Q4) The params modifier can be used anywhere in the method's header.
A)True
B)False
Q5) Which of the following correctly declares and initializes a two-dimensional rectangular array of integers
A) int[,] sum = new int[3, 4];
B) int[] sum = new int[2, 4];
C) int sum[] = new int[2, 2];
D) None of the above.
10
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Chapter 9: Introduction to Linq and Generic Collections
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Sample Questions
Q1) The international standard for querying relational databases is called:
A) XML
B) SQL
C) HTTP
D) LINQ
Q2) LINQ is used to query collections in the same way it's used to query arrays.
A)True
B)False
Q3) You can sort a LINQ query's results only by one property.
A)True
B)False
Q4) TheNET collection classes provide flexible,efficient alternatives to arrays.
A)True
B)False
Q5) The results of a LINQ query can have only the same type as the data being queried-for example,a LINQ query on a collection of Employee objects will always have Employee objects in the results.
A)True
B)False
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Chapter 10: Classes and Objects: A Deeper Look
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Sample Questions
Q1) You cannot validate values assigned to properties using an object initializer.
A)True
B)False
Q2) displays the variables and methods for all classes in a project.
A) Class View
B) Object Browser
C) Design View
D) None of the above.
Q3) A class cannot have references to objects of other classes as members.
A)True
B)False
Q4) Keyword _______ is used to indicate a method overloads a specific operator.
A) implement
B) operator
C) overload
D) op
Q5) An object initializer calls the default constructor before executing.
A)True
B)False
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Chapter 11: Object-Oriented Programming: Inheritance
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Sample Questions
Q1) When a derived-class member overrides a base-class member,the base-class member can be accessed from the derived-class by using the keyword
A) base
B) top
C) super
D) None of the above
Q2) The process of abstraction allows you to focus on the commonalities among objects in the system.
A)True
B)False
Q3) Base class methods with this level of access cannot be called from derived classes.
A) private
B) public
C) protected
D) package
Q4) A key to improving the software development process is encouraging soft ware reuse.
A)True
B)False
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Chapter 12: Object-Oriented Programming: Polymorphism
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Sample Questions
Q1) Classes and methods are declared sealed for all of the following reasons,except:
A) sealed methods allow inlining the code.
B) sealed methods and classes prevent further inheritance.
C) sealed methods are static.
D) sealed methods can improve performance.
Q2) A class that implements an interface but does not declare all of the interface's methods must be declared:
A) public
B) interface
C) abstract
D) final
Q3) Interfaces can have methods.
A) 0
B) 1
C) 2
D) any number of
Q4) When used correctly,polymorphism will never require changes to be made to any part of the program.
A)True
B)False
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Chapter 13: Exception Handling: A Deeper Look
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Sample Questions
Q1) In many cases,handling an exception allows a program to automatically restart execution of the program from the beginning.
A)True
B)False
Q2) Programmer-defined exception classes typically should contain 3 constructors:
A) a default constructor, a constructor that receives a string for the error message and a constructor that receives an Exception argument of the inner exception object
B) a default constructor, a constructor that receives a string and a constructor that receives both a string and an exception
C) a constructor that receives a string, a constructor that receives an exception and a constructor that receives both
D) a default constructor, a constructor that receives a string and a constructor that receives a number indicating the line number where the exception occurred
Q3) There must be a catch clause for every expected exception type.
A)True
B)False
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Chapter 14: GUI With Windows Forms: Part 1
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Sample Questions
Q1) An example of software with a GUI is:
A) Windows
B) Internet Explorer
C) Visual Studio
D) All of the above
Q2) Multicast event delegates must reference methods:
A) with the same name, but a different signature
B) that should all be raised by the same event
C) defined earlier in the program
D) with different names and different signatures
Q3) In order to create an event you must click on the event icon in the properties window.
A)True
B)False
Q4) What does the ReadOnly property indicate
A)the number of the control cannot change
B)the user cannot click the buttons to select a number into the control
C)the user cannot type data into the control
D) all of the above
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Chapter 15: GUI With Windows Forms: Part 2
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Sample Questions
Q1) The UseMnemonic property indicates that ampersand (&)should be interpreted as a shortcut rather than an actual character.
A)True
B)False
Q2) Which of the following statements are true about menus created through C#
A)Provide groups of related commands for Windows apps.
B)Organize commands without cluttering the GUI
C)Have the capacity to create shortcuts for the menu commands
D)All of the above
Q3) What does the DateTimePicker allow for
A)time selection
B)date selection
C)a and b
D)None of the above
Q4) The Format property specifies the user's selection options using the DateTimePickerFormat enumeration.
A)True
B)False
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Chapter 16: Strings,Characters and Regular Expressions
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Sample Questions
Q1) If a method's arguments cause it to access an index of the string that is beyond its length,the program will retrieve whatever is in that memory location.
A)True
B)False
Q2) If a number is formatted with the D3 formatter,it means that:
A) the number has to have at least three digits even if they are zero
B) the number has a dollar sign and is at least three digits long C) creates each number in three dimensions
D) it is an error
Q3) In regular expressions,a word character is considered to be any alphanu meric character.
A)True
B)False
Q4) Method LastIndexOf is used to find the last occurrence of given text in a string.
A)True
B)False
Q5) The char,int,and double types are all defined by structs.
A)True
B)False
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Chapter 17: Files and Streams
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Sample Questions
Q1) All simple-type variables and strings are serializable.
A)True
B)False
Q2) Which of the following attributes is needed to indicate to the CLR that objects of the class can be serialized
A)[Serializable]
B)[DeSerializable]
C)[Serialize]
D)both a and b
Q3) Which of the following methods of FileStream will reset the file-position pointer back to the beginning of the file
A)Reset
B) Origin
C) Seek
D) Beginning
Q4) The standard output stream object enables a program to output data to the screen.
A)True
B)False
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Chapter 18: Searching and Sorting
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Sample Questions
Q1) What is the efficiency of merge sort
A) O(log n)
B) O(n)
C) O(n log n)
D) O(n2)
Q2) Which of the following sorting algorithms is the fastest when sorting a large array
A)Selection sort
B)Insertion sort
C)Merge sort
D)They all run at roughly the same speed
Q3) O(1)means that the algorithm has a constant run time.
A)True
B)False
Q4) Insertion sort is a simple and inefficient algorithm.
A)True
B)False
Q5) The Big O Notation measures the average case run time of an algorithm.
A)True
B)False
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Chapter 19: Data Structures
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Sample Questions
Q1) A __________ class contains a reference member that refers to an object of the same class type.
A) self-determining
B) self-pointing
C) self-linking
D) self-referential
Q2) Which statement is false
A) Linked lists are collections of data items "lined up in a row," insertions and deletions can be made anywhere in a linked list.
B) Insertions and deletions are made only at one end of a stack, its top.
C) Insertions and deletions are made only at one end of a queue, its tail.
D) Binary trees facilitate high-speed searching and sorting of data.
Q3) Queue nodes are removed only from the __________ of the queue,and are inserted only at the __________ of the queue.
A)tail,tail
B)tail,head
C)head,tail
D)head,head
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Chapter 20: Generics
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Q1) If there's a constructor constraint,the type argument's class must not provide constructors.
A)True
B)False
Q2) A ________ provides a means for describing a class in a type-independent manner.
A) subclass
B) generic class
C) concrete class
D) parameterized class
Q3) A type parameter _____________.
A) is an identifier that is used in place of an actual type name
B) can be used to declare the return type
C) acts as a placeholder for the type of an argument passed to the generic method
D) All of the above
Q4) You can use explicit type arguments to indicate the exact type that should be used to call a generic method (e.g.,< int >).
A)True B)False
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Chapter 21: Collections
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Sample Questions
Q1) C# 6's using static directive ________.
A) converts each of a class's methods to static.
B) converts the class to static.
C) allows access to a class's static members without fully qualifying their names.
D) None of the above.
Q2) Which of the following is not a method provided by an array
A) Sort
B) Copy
C) BinarySearch
D) Reverse
E) None of the above
Q3) Which of the following statements is false
A) Lambda expressions allow you to define simple, anonymous methods.
B) A lambda's return type is listed to the left of the lambda.
C) A delegate can hold a reference to a lambda expression that has a signature that's compatible with the delegate type.
D) A lambda expression is called via a variable that references it.
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Chapter 22: Databases and LING
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Sample Questions
Q1) A master/detail view app typically allows the user to select an entry to see (and potentially manipulate)the details associated with that entry.
A)True
B)False
Q2) DBExtensions method Load loads an entire database's data into a DbContext.
A)True
B)False
Q3) Tables from databases are commonly shown in a GUI through a ________.
A) DataBoxView
B) DataGridView
C) ListBoxView
D) SpreadSheet
Q4) Today's most popular database systems are ________.
A) management databases
B) structural databases
C) formatted databases
D) relational databases
Q5) A primary key must be unique for each record in the relational database table. A)True
B)False
24
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Chapter 23: Asynchronous Programming With Async and Await
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Sample Questions
Q1) Today's ________ computers,smartphones and tablets enable computers to perform tasks truly concurrently.
A) large memory
B) multiscreen
C) soft keyboard
D) multicore
Q2) A method is declared async to indicate to the compiler that the method will
A) wait for a callback
B) perform a synchronous activity
C) create multiple threads
D) await an asynchronous task
Q3) Enumerable static method ________ creates a list of elements containing the first argument's value.The length of the list is specified by the second argument.
A) Enumerate
B) Repeat
C) Generate
D) None of the above.
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Chapter 24: XML
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Sample Questions
Q1) Method ________ returns an IEnumerable< XNode > containing all children of the given XContainer.
A) Children
B) Nodes
C) Elements
D) Descendants
Q2) XML namespaces help avoid naming collisions between XML documents.
A)True
B)False
Q3) XslCompiledTransform's ____________ method applies the compiled style sheet to a specified XML document.
A) Compile
B) Load
C) Transform
D) None of the above
Q4) The EMPTY keyword specifies that the element does not contain any data between its start and end tag.
A)True
B)False
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Chapter 25: GUI With Windows Presentation Foundation
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Q1) A StackPanel has a vertical or horizontal flow,set by its _____ attribute.
A) Order
B) Orientation
C) FlowType
D) Direction
Q2) WPF styles require you to explicitly set the individual properties of each control.
A)True
B)False
Q3) A WPF style is a set of that can be reused for any number of controls.
A) property-value definitions
B) event-handler definitions
C) background images
D) a and b.
Q4) The ________ property determines the amount of space around a control's edges.
A) Padding
B) Margin
C) Space
D) Edges
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