Browse topic-based Object Oriented System Design practice sets.
73 practice sets · Page 1 of 4
Which of the following concept is often expressed by the phrase, 'One interface, multiple methods'?
Abstraction
Polymorphism
Inheritance
Encapsulation
Correct Answer: B — Polymorphism
Explanation:
No explanation is available for this question yet.
Which Keyword from the following is used to inherit properties from one class into another?
extends
subclasses
native
all of the mentioned
Correct Answer: A — extends
Explanation:
No explanation is available for this question yet.
Which of the following supports the concept of hierarchical classification?
Polymorphism
Encapsulation
Abstraction
Inheritance
Correct Answer: D — Inheritance
Explanation:
Use of Hierarchical classification avoids defining the properties of object explicitly at each level which have acquired their properties from higher levels.
Which of the following is a mechanism by which object acquires the properties of another object?
Encapsulation
Abstraction
Inheritance
Polymorphism
Correct Answer: C — Inheritance
Explanation:
'Inheritance' is the mechanism provided by Object Oriented Language, which helps an object to acquire the properties of another object usually child object from parent object.
How will a class protect the code inside it?
Using Access specifiers
Abstraction
Use of Inheritance
All of the mentioned
Correct Answer: A — Using Access specifiers
Explanation:
Each method or variable in a class may be marked 'public' or 'private'. They are called Access Specifiers.
What is 'Basis of Encapsulation'?
object
class
method
all of the mentioned
Correct Answer: D — all of the mentioned
Explanation:
Encapsulation is the mechanism that binds together code and data it manipulates, and keeps both safe from outside interface and misuse. Class, which contains data members and methods is used to implement Encapsulation.
Which of the these is the functionality of 'Encapsulation'?
Binds together code and data
Using single interface for general class of actions.
Reduce Complexity
All of the mentioned
Correct Answer: A — Binds together code and data
Explanation:
'Encapsulation' acts as protective wrapper that prevents code and data from being accessed by other code defined outside the wrapper.
Which of the following mechanisms is/are provided by Object Oriented Language to implement Object Oriented Model?
Encapsulation
Inheritance
Polymorphism
All of the mentioned
Correct Answer: D — All of the mentioned
Explanation:
No explanation is available for this question yet.
Which of the following is the functionality of 'Data Abstraction'?
Reduce Complexity
Binds together code and data
Parallelism
None of the mentioned
Correct Answer: A — Reduce Complexity
Explanation:
An essential element of Object Oriented Programming is 'Data Abstraction' which means hiding things. Complexity is managed through abstraction.
Which is a named memory location assigned a value by the program?
variable
literal
identifier
None of the mentioned
Correct Answer: A — variable
Explanation:
No explanation is available for this question yet.
Which of the following is called as 'Compilation unit'?
Object file
Byte code
Source file
All of the mentioned
Correct Answer: C — Source file
Explanation:
No explanation is available for this question yet.
Java Compiler translates the source code into?
Machine code
Assembly code
Byte code
JVM code
Correct Answer: C — Byte code
Explanation:
Java program is converted into 'byte code' which makes it easier to run on wide variety of environments. Only the run-time package JVM has to be implemented for each platform.
Which of the following is/are advantage of using object oriented programming?
Code Reusability
Can create more than one instance of a class without interference
Platform independent
All of the mentioned
Correct Answer: D — All of the mentioned
Explanation:
No explanation is available for this question yet.
Which of the following approach is followed by Object Oriented Language during the execution of a program?
Bottom up approach
Top down approach
Both a and b
None of the mentioned
Correct Answer: A — Bottom up approach
Explanation:
Bottom up approach begins with details and moves to higher conceptual level there by reducing complexity and making the concept easier to understand.
Which of the following Paradigm is followed by Object Oriented Language Design?
Process-Oriented Model
Data Controlling access to code.
Both a and b
None of the mentioned
Correct Answer: B — Data Controlling access to code.
Explanation:
Object-oriented programming organises a program around its data(that is, objects) and a set of well-defined interfaces to that data.
Which of the following approach help us understand better about Real time examples, say Vehicle or Employee of an Organisation?
Procedural approach
Object Oriented approach
Both a and b
None of the mentioned
Correct Answer: B — Object Oriented approach
Explanation:
Object Oriented Programming supports the concept of class and object which help us understand the real time examples better. Vehicle is defined to be a class. Car, truck, bike are defined to be objects of the class, Vehicle.
Which of the following statements about object model is true I. Object model encourages the reuse of software and entire design of the application. II. Object model produces systems that are built upon stable intermediate forms. III. Object model reduce the inherent in developing complex systems. IV. None of the mentioned
I, III
I, II
I, II, III
IV
Correct Answer: C — I, II, III
Explanation:
All the above written statements are the benefits of object model.
_____________ is the property that distinguishes an active object from one that is not active.
Persistence
Typing
Aggregation
Concurrency
Correct Answer: D — Concurrency
Explanation:
No explanation is available for this question yet.
Subclass represents _______________ abstractions
Generalized abstractions
Specialization abstractions
Both
None of the mentioned
Correct Answer: B — Specialization abstractions
Explanation:
Specialization means creating new subclasses from an existing class.
Superclass represents ______________ abstractions
Generalized abstractions
Specialization abstractions
Both
None of the mentioned
Correct Answer: A — Generalized abstractions
Explanation:
Generalization is the process of extracting shared characteristics from two or more classes, and combining them into a generalized superclass.
