OOPs is object-oriented programming, basically an approach for developing software programming. It was introduced to overcome the shortcomings of procedural programming approaches such as reusability and maintainability. OOPs is a way to design an application using classes and objects. The basic idea behind object-oriented languages ​​is to combine both data and functions into one entity. The operation data and functions of these data, such as units, are designated as objects.
MCQs on Object-Oriented Programming
Solve OOPs Multiple-Choice Questions to prepare better for GATE. If you wish to learn more about Object-Oriented Programming and OOPs MCQs, you can check notes, mock tests, and previous years’ question papers. Gauge the pattern of MCQs on OOPs by solving the ones that we have compiled below for your practice:
OOPs Multiple-Choice Questions
1. Which of these features of OOP would indicate code reusability?
a. Polymorphism
b. Abstraction
c. Inheritance
d. Encapsulation
Answer: (c) Inheritance
2. Which language does not support polymorphism but supports classes?
a. Ada
b. C++
c. Java
d. SmallTalk
Answer: (a) Ada
3. Which of these specifiers would be applied to the constructors only?
a. Explicit
b. Implicit
c. Protected
d. Public
Answer: (a) Explicit
4. A constructor _____________.
a. May consist of a return type
b. Doesn’t consist of any return type
c. Has some return type
d. Of a derived class has a return type
Answer: (b) Doesn’t consist of any return type
5. The access specifier that is/are the most secure during inheritance is/are _______________.
a. Protected
b. Private
c. Private and Default
d. Default
Answer: (b) Private
6. If in case, in multiple inheritances, a class R would inherit the Class Q, while Class Q would inherit the class P, then in which sequence would their destructors be called in case we declare an object of Class R?
a. ~R() then ~P() then ~Q()
b. ~P() then ~Q() then ~R()
c. ~Q() then ~R() then ~P()
d. ~R() then ~Q() then ~P()
Answer: (d) ~R() then ~Q() then ~P()
7. The memory that is allocated for any objects is ____________.
a. Cache
b. HDD
c. ROM
d. RAM
Answer: (d) RAM
8. Which of these classes is a specialization of some more general template classes?
a. Integer
b. Maths
c. String
d. Digit
Answer: (c) String
9. A derived class is also called a ______________.
a. Small class
b. Subclass
c. Noticeable class
d. Big class
Answer: (b) Subclass
10. Which of these inheritances is shown in case we inherit some base class from another class, then one of the classes derives it?
a. Single
b. Multiple
c. Multi-level
d. Hierarchical
Answer: (c) Multi-level
11. Hierarchical inheritance could be some subset of _________________ inheritance.
a. Multilevel
b. Single level
c. Multiple
d. Hybrid
Answer: (d) Hybrid
12. What is the name of the feature in which we enforce the definitions of the abstract function at the compile time?
a. Dynamic Polymorphism
b. Static Polymorphism
c. Dynamic or Static Polymorphism according to need
d. Polymorphism
Answer: (a) Dynamic Polymorphism
13. If in case a class is called in the main function directly and has a public member function, then ____________________.
a. It will lead to the production of an undeclared function error
b. It will lead to the production of an out of memory error
c. The program will only give warning
d. The program will shut the computer down
Answer: (a) It will lead to the production of an undeclared function error
14. __________ is the universal handler class for exceptions.
a. Maths
b. Object
c. Exceptions
d. Errors
Answer: (c) Exceptions
15. For catching multiple exceptions in a single catch block, then how do we separate exceptions in the syntax?
a. Hyphen
b. Vertical bar
c. Modulus
d. Plus
Answer: (b) Vertical bar
16. Where are the temporary objects (that are created during the return by value) created?
a. Inside the calling function
b. Inside the main function
c. Within the function
d. Outside the function scope
Answer:(c) Within the function
17. What shall we use in the case of safe downcast?
a. Implicit cast
b. Manual cast
c. Dynamic cast
d. Static cast
Answer: (c) Dynamic cast
18. Which of these types of values result from a delete operator?
a. null
b. null pointer
c. void pointer
d. void
Answer: (d) void
19. Which of these attributes can we use if we want to get the actual size of any array?
a. Array_name.length
b. Size.Array
c. length.Array_name
d. Array.Size
Answer: (a) Array_name.length
20. Which function is used to get any character that is present at a certain index of a string?
a. char charIn(StringName);
b. char charAt(index);
c. char charIn(index);
d. char charAt(StringName);
Answer: (b) char charAt(index);
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