Teach Exam - Free Online Test & solution

Question : What is the main purpose of inheritance in OOP?

Solution : To establish a parent-child relationship between classes

Description -

The main purpose of inheritance in Object-Oriented Programming (OOP) is to promote code reusability and hierarchical relationships between classes.

Key Goals of Inheritance:

Code Reuse: Allows a new class (child or subclass) to inherit attributes and methods from an existing class (parent or superclass), reducing code duplication.
Extensibility: Enables developers to extend or modify existing behavior without changing the original code.
Polymorphism: Supports dynamic method overriding, allowing subclasses to provide specific implementations of methods defined in the parent class.
Hierarchy Representation: Models real-world relationships (e.g., a Dog is a type of Animal).
Maintainability: Centralizes common logic in base classes, making systems easier to maintain and update.

STET Computer Science : Asked Question-2023 (part-1)

Question : Which principle ensures that only essential information is visible to the outside world?

Solution : Abstraction

Description -

Abstraction in Object-Oriented Programming (OOP) is one of the fundamental principles, along with encapsulation, inheritance, and polymorphism. It refers to the concept of hiding the complex implementation details and showing only the essential features of an object.

Real-life Example:

Think of a car:

What you interact with: Steering wheel, accelerator, brake (this is the abstract interface).
What you don’t see: The engine, the fuel combustion system, brake hydraulics (this is the internal complexity).

abstract class Animal {
abstract void makeSound(); // Abstract method
}

class Dog extends Animal {
void makeSound() {
System.out.println("Bark");
}
}

Benefits of Abstraction:

Reduces complexity
Increases code reusability
Improves security by hiding implementation details
Makes maintenance easier

Question : Which of the following best defines a class?

Solution : A blueprint for creating objects

Description -

A class defines the structure and behavior (data and functions) that the objects created from the class will have. You can think of it like an architectural blueprint for a house — it outlines what the house should include, but it's not the house itself.

An object is an instance of a class — a concrete implementation created based on the blueprint.

Class vs Object (Quick Table)

Term	Description	Example
Class	The blueprint or template	`Car` class
Object	The actual thing created from the class	`myCar = Car()`

Question : What is the purpose of the "super" keyword in Java and other similar languages?

Solution : It refers to the superclass in inheritance

Description - The super keyword exists in several object-oriented programming languages, not just Java. Its purpose is generally the same: to access methods or constructors from a superclass (parent class).

Question : What is an abstract class in OOP?

Solution : A class that cannot be instantiated

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Question : Which keyword is used to create an instance of a class in most programming languages?

Solution : new

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Question : What is the purpose of staffing level estimation in software project management?

Solution : To identify potential risks in the project

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Question : Which metric is used for estimating the size of a software project?

Solution : Function Points (FP)

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Question : What is the main goal of System Testing?

Solution : Testing software functionality from the user's perspective

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Question : Which testing approach involves testing individual components or units of code?

Solution : Unit Testing

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Question : Reverse engineering is primarily used for:

Solution : Understanding and documenting existing software

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Question : What is the main goal of software quality assurance?

Solution : To establish and enforce standards and processes to improve software quality

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Question : Which software life cycle model allows for iterative development and incorporates risk analysis?

Solution : Spiral model

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Question : What is the purpose of ARP (Address Resolution Protocol)?

Solution : To map MAC addresses to IP addresses

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Question : Routing involves:

Solution : Determining the best path for data packets

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Question : Contention-based MAC protocols are commonly used in:

Solution : Ethernet networks

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Question : Which of the following is NOT a network topology?

Solution : Disk

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Question : Data transmission using multiple pathways simultaneously is known as:

Solution : Parallel Transmission

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Question : What is a socket in the context of process-to-process communication?

Solution : A software interface for network communication

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Question : What is the primary function of routing in the network layer?

Solution : Finding the best path for data

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Question : The term "Data" refers to:

Solution : Row Facts and figures

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Question : The term "FAT" is stands for_____

Solution : File Allocation Table

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Question : The term "DFD" stands for?

Solution : Data flow diagram

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Question : Which of the following is a top-down approach in which the entity's higher level can be divided into two lower sub-entities?

Solution : Specialization

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Question : The term "NTFS" refers to which one of the following?

Solution : New Technology File System

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Question : Which of the following is correct according to the technology deployed by DBMS?

Solution : Locks are used to maintain transactional integrity and consistency

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Question : What is DBMS?

Solution : DBMS stores, modifies and retrieves data

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Question : In multiprogramming with fixed partitions, if a process requires more memory than is available in a partition, it may lead to:

Solution : Fragmentation

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Question : The purpose of a page table in a paging system is to:

Solution : Translate virtual addresses to physical addresses

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Question : The primary goal of load control is to:

Solution : Ensure that CPU time is evenly distributed among processes

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Question : The I/O subsystem in an operating system is responsible for:

Solution : Managing input/output operations between processes and input/output devices

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Question : File manipulation operations in an operating system include:

Solution : Reading, writing, and modifying file content

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Question : In an operating system, a "buffer cache" is used to:

Solution : Store copies of frequently used files in memory

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Question : A formal model of protection in an operating system provides:

Solution : A mathematical framework for analyzing resource allocation

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Question : The process of removing recursion involves replacing recursive function calls with:

Solution : Loops

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Question : In the Tower of Hanoi problem with "n" disks, how many moves are required to solve the problem?

Solution : 2^n - 1

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Question : Which collision resolution technique involves placing collided elements in the next available empty slot in the hash table?

Solution : Linear probing

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Question : Separate chaining involves storing collided elements in separate data structures, typically in:

Solution : Linked lists

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Question : In a directed graph, an edge that points from vertex A to vertex B is denoted as:

Solution : (A, B)

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Question : Which traversal algorithm is typically implemented using a stack data structure?

Solution : DFS

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Question : A threaded binary tree is a binary tree in which:

Solution : Each node has a thread connecting it to its predecessor or successor

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Question : Divide and Conquer is an algorithmic paradigm that solves problems by:

Solution : Recursively solving subproblems

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Question : The recurrence equation T(n) = T(n/2) + 1 represents the time complexity of which algorithmic paradigm?

Solution : Divide and Conquer

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Question : If an algorithm's behavior is bounded by "o(f(n)) if g(n)", what notation does it become when the condition is removed?

Solution : o(f(n))

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Question : Conditional asymptotic notation allows for a more nuanced analysis of algorithm behavior under specific conditions. This is particularly useful when:

Solution : Algorithm behavior varies based on certain input characteristics

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Question : Which term refers to the strategy of optimizing an algorithm's use of resources, often by making sacrifices in one aspect for improvements in another?

Solution : Tradeoff

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Question : Which data structure often results in a time-space tradeoff by using extra memory to speed up operations?

Solution : Hash tables

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Question : Microcontrollers find application in various fields. What is a typical application of microcontrollers in the automotive industry?

Solution : Engine control in cars

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Question : How is the width of the data bus typically measured in a microcomputer system?

Solution : In bits

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Question : Which component of an ideal microcomputer is responsible for temporarily holding data and instructions during processing?

Solution : Memory

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Question : To convert a Gray Code to its binary equivalent, which technique is commonly used?

Solution : Exclusive OR (XOR) operation

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Question : What is the relationship between the distance between parity bits and their error detection and correction capability in Hamming Code?

Solution : Closer parity bits provide lower error correction capability

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Question : In binary multiplication using the simple method, what is the first step after aligning the digits and preparing for multiplication?

Solution : Multiply the least significant bit (LSB) by the multiplier

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Question : If the sum of two positive binary numbers is 11010 and there is a carry-out from the MSB, what should be done to obtain the correct result?

Solution : Add the carry to the least significant bit (LSB)

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Question : Given a Boolean function F(A, B, C) = Σ(0, 1, 2, 3, 5), what is the expression in SOP form?

Solution : A'B' + AB' + AB + AC

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Question : What is the primary difference between ROM and RAM?

Solution : ROM stores permanent data that cannot be changed, while RAM stores temporary data that can be read and written

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Question : Which logic family uses both depletion and enhancement mode MOSFETs for its operation?

Solution : CMOS

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Question : Which type of register is primarily used to temporarily hold data during arithmetic and logical operations in a microprocessor?

Solution : Accumulator register

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Question : In a PLA, what components are used to implement the combinational logic functions?

Solution : AND gates and OR gates

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Question : What is the simplified expression for the Boolean function F(A, B, C, D) = Σ(0, 1, 2, 4, 5, 6, 8, 9, 10, 12, 13, 14) using the K-map method?

Solution : A'B'C'D' + A'B'C'D + A'BC'D + AB'C'D + ABCD

Description -

solution - STET Computer Science : Asked Question-2023 (part-1)

Key Goals of Inheritance:

Real-life Example:

Benefits of Abstraction:

Class vs Object (Quick Table)