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🚀 Exciting Times for the IT Industry! 🌐
The IT sector is bouncing back stronger than ever from recent economic slowdowns, and opportunities are on the rise. 📈 Many companies are now actively conducting written tests to gauge candidates' knowledge of fundamental concepts in databases, object-oriented programming (OOPs), and Java basics. It's an exhilarating time for job seekers in the tech field!
🔥 Boost Your Confidence for the Written Test!
If you're gearing up to tackle these written tests, you're in luck! 💪 I've got your back with a treasure trove of frequently asked Multiple Choice Questions (MCQs) that cover essential topics in databases, OOPs, and Java. These MCQs have been handpicked to help you sharpen your skills and boost your confidence before diving into the written test.
Whether you're a seasoned pro looking to brush up on the basics or a newcomer eager to make a strong impression, these MCQs will be your secret weapon! Stay tuned for daily updates as we unravel these questions one by one.
Here are the OOPS top 25 question and answers before attempting to any campus interviews.
1. What does OOP stand for?
a. Object-Oriented Programming
b. Object-Oriented Protocol
c. Object-Oriented Process
d. Object-Oriented Project
Answer: a. Object-Oriented Programming
Explanation: OOP stands for Object-Oriented Programming, which is a programming paradigm that
uses objects and classes to structure code.
2.Which of the following is not a fundamental concept of OOP?
a. Inheritance
b. Encapsulation
c. Abstraction
d. Compilation
Answer: d. Compilation
Explanation: Compilation is not a fundamental concept of OOP. It is a process of converting source
code into machine code.
3.What is an object in OOP?
a. A variable that stores data
b. An instance of a class
c. A method to perform an action
d. A reserved keyword
Answer: b. An instance of a class
Explanation: An object is an instance of a class in OOP. It represents a specific entity or concept.
4.Which OOP principle promotes code reusability?
a. Inheritance
b. Polymorphism
c. Encapsulation
d. Abstraction
Answer: a. Inheritance
Explanation: Inheritance allows you to create new classes that inherit properties and behaviors from
existing classes, promoting code reusability.
5.What is encapsulation in OOP?
a. Hiding the internal implementation details of a class
b. Creating multiple instances of a class
c. Inheriting from multiple classes
d. Overloading a constructor
Answer: a. Hiding the internal implementation details of a class
Explanation: Encapsulation is the concept of hiding the internal details of a class and providing
access to the data and methods through well-defined interfaces.
6.Which keyword is used to create a new instance of a class in most OOP languages?
a. this
b. new
c. instance
d. create
Answer: b. new
Explanation: The "new" keyword is commonly used to create a new instance of a class in many OOP
languages.
7.What is the purpose of the "super" keyword in OOP?
a. To access superclass methods and properties
b. To create a new instance of a class
c. To define a static method
d. To declare a variable
Answer: a. To access superclass methods and properties
Explanation: The "super" keyword is used to access methods and properties of the superclass
(parent class) in OOP.
8.Which OOP principle allows a class to have multiple methods with the same name but different
parameters?
a. Inheritance
b. Polymorphism
c. Encapsulation
d. Abstraction
Answer: b. Polymorphism
Explanation: Polymorphism allows a class to have multiple methods with the same name but
different parameters, enabling method overloading and overriding.
9.Inheritance represents a _____ relationship between classes.
a. Has-a
b. Is-a
c. Uses-a
d. Contains-a
Answer: b. Is-a
Explanation: Inheritance represents an "is-a" relationship between classes, where a subclass is a
specialized version of its superclass.
10.What is the main purpose of an abstract class in OOP?
a. To create objects
b. To provide a blueprint for other classes
c. To store data
d. To implement multiple interfaces
Answer: b. To provide a blueprint for other classes
Explanation: Abstract classes are used to provide a blueprint or template for other classes to inherit
from and implement.
11.Which keyword is used to prevent a class from being inherited in some OOP languages?
a. final
b. static
c. private
d. abstract
Answer: a. final
Explanation: The "final" keyword is used to prevent a class from being inherited or extended in OOP.
12.Which OOP principle allows a class to implement multiple interfaces?
a. Inheritance
b. Polymorphism
c. Encapsulation
d. Multiple Inheritance
Answer: d. Multiple Inheritance
Explanation: Multiple Inheritance allows a class to implement multiple interfaces or inherit from
multiple classes in some programming languages.
13.What is method overloading in OOP?
a. Defining multiple methods with the same name but different implementations
b. Defining a method with the same name and parameters in the same class
c. Hiding the implementation details of a method
d. Changing the name of a method
Answer: a. Defining multiple methods with the same name but different implementations
Explanation: Method overloading is the practice of defining multiple methods in a class with the
14.same name but different parameters or implementations.
What is the access modifier "private" in OOP?
a. Allows access to the method or property from any class
b. Allows access only within the same class
c. Allows access only within the same package or namespace
d. Allows access to any subclass
Answer: b. Allows access only within the same class
Explanation: The "private" access modifier restricts access to methods or properties to only the
15.same class where they are defined.
Which OOP principle allows you to define a general class with some methods left unimplemented?
a. Inheritance
b. Polymorphism
c. Encapsulation
d. Abstraction
Answer: d. Abstraction
Explanation: Abstraction allows you to define a general class with some methods declared but not
implemented, leaving the implementation details to the subclasses.
16.hat is a constructor in OOP?
a. A method used to destroy objects
b. A method used to create objects
c. A method used to access static variables
d. A method used to access private methods
Answer: b. A method used to create objects
Explanation: A constructor is a special method used to initialize and create objects of a class.
17.Which keyword is used to access the current instance of a class in OOP?
a. self
b. this
c. me
d. current
Answer: b. this
Explanation: The "this" keyword is commonly used to refer to the current instance of a class in OOP.
18.What is a static method in OOP?
a. A method that can only be called on an instance of a class
b. A method that can be called on a class itself, without creating an instance
c. A method that can be overridden in a subclass
d. A method that is always private
Answer: b. A method that can be called on a class itself, without creating an instance
Explanation: A static method is a method that belongs to the class itself and can be called without
creating an instance of the class.
19.Which OOP principle allows a class to hide its internal state and expose only necessary information?
a. Inheritance
b. Polymorphism
c. Encapsulation
d. Abstraction
Answer: c. Encapsulation
Explanation: Encapsulation allows a class to hide its internal state and expose only the necessary
information through well-defined interfaces.
20.What is the purpose of the "interface" in OOP?
a. To define a concrete class
b. To implement multiple inheritance
c. To define a contract for implementing classes
d. To create objects
Answer: c. To define a contract for implementing classes
Explanation: An interface in OOP defines a contract that specifies the methods that implementing
classes must provide.
21.Which OOP principle allows a class to provide different implementations of a method based on the
input parameters?
a. Inheritance
b. Polymorphism
c. Encapsulation
d. Abstraction
Answer: b. Polymorphism
Explanation: Polymorphism allows a class to provide different implementations of a method based
on the input parameters, enabling method overloading and overriding.
22.What is the purpose of the "extends" keyword in Java and similar languages?
a. To create an object
b. To implement an interface
c. To inherit from a superclass
d. To declare a variable
Answer: c. To inherit from a superclass
Explanation: In Java and similar languages, the "extends" keyword is used to indicate that a class is
inheriting from a superclass.
23.Which OOP principle allows a class to inherit properties and behaviors from a parent class?
a. Inheritance
b. Polymorphism
c. Encapsulation
d. Abstraction
Answer: a. Inheritance
Explanation: Inheritance allows a class to inherit properties and behaviors from a parent class
(superclass).
24.What is method overriding in OOP?
a. Defining multiple methods with the same name but different implementations
b. Defining a method with the same name and parameters in the same class
c. Hiding the implementation details of a method
d. Providing a specific implementation of a method in a subclass
Answer: d. Providing a specific implementation of a method in a subclass
Explanation: Method overriding is the practice of providing a specific implementation of a method in
a subclass that overrides the implementation in the superclass.
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HiTechPulse
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