TCS interview questions

  1. Introduction
  2. TCS Interview Questions For Rookies & Skilled
  3. Conclusion


Earlier than diving into the essential TCS interview questions & solutions, allow us to perceive extra in regards to the group!

TCS (Tata Consultancy Service) is without doubt one of the prime famend Indian multinational corporations that present consultancy service, data expertise, and enterprise options worldwide. It’s thought of a world chief within the subject of knowledge expertise.

The corporate’s headquarters is in Mumbai. The corporate operates its enterprise in 46 international locations all around the world. 

The corporate has an excellent repute and is taken into account one of the trusted Indian manufacturers worldwide. As per the most recent report generated by Model Finance, the main model valuation agency globally, Tata Consultancy Service is now the second most respected model. 

Some Necessary Stats About TCS

In 2015, in probably the most modern corporations rating listing of the world,  printed by Forbes, it gained sixty fourth place general, making it each the highest-ranked IT companies firm and the highest Indian firm. TCS was featured at tenth place within the Fortune India 500 listing in 2015. In April 2018, it turned the primary Indian IT firm to cross $100 billion market capitalization.

In 2021, it was on the No. 3 place, after IBM. In accordance with the stories, till Mar 2022, the market capitalization of Tata Consultancy Companies is round $171.23 Billion, making it one of many largest corporations.

In accordance with credible statistics, approx 70% of the dividend of Tata Sons is generated by Tata Consultancy Service.

The enterprise mannequin and technique of TCS are so efficient that its relationship with prospects has at all times been deep and guaranteeing. Its extremely energetic workforce, regular and well timed growth of enterprise, sturdy market repute, and confirmed historical past of repeatedly delivering longer-term stakeholder worth make this firm totally different from the others. With a lot historical past and repute available in the market, everybody needs to work at TCS. For that reason, we’ve got compiled a listing of TCS interview questions you could put together.

tcs interview questions

TCS Interview Questions For Rookies & Skilled

1. What’s the performance of a Linked Record?

A linked listing is a kind of linear knowledge construction. In that enter knowledge isn’t saved sequentially within the pc reminiscence; the enter knowledge is saved randomly inside the pc’s reminiscence. The saved knowledge inside the pc reminiscence are linked with one another with the assistance of handle. With the assistance of handle, enter knowledge could be fetched from the pc reminiscence as output, precisely like enter, in sequential order.

Let’s perceive in one other manner what a linked listing is.

A linked listing could be outlined as a set of nodes. Every node is split into two elements, the place, within the first half, knowledge is saved, and within the second half, the handle of the following following node is saved. It retains on persevering with until the final node of the linked listing. The final node incorporates null within the handle half means no nodes are forward within the sequence. Every node’s assigned handle means the bodily location within the pc reminiscence, and these addresses are random. Within the programming language time period, the primary half is named the info half, and one other one is named the following. 

The linked listing begins with a begin node that is named a pointer, it incorporates the handle of the primary node and its operate to provide begin to the linked listing, however the final node of the listing has a null pointer figuring out the earlier node. With the assistance of a begin pointer, the linked listing could be traversed simply.

2. What are the essential rules of OOPS?

This is without doubt one of the most typical TCS interview questions. The Object-Oriented Programming System has the next 4 primary rules:

a)   Abstraction

Abstraction is the idea of hiding pointless data from the customers and displaying solely performance to the customers.

Let’s perceive it with the instance of sending an e mail. You sort the message and ship it to the addressee. Now, what inner processes happen within the supply of the message, you don’t know. Abstraction permits you solely to know the item’s operate as an alternative of how the item capabilities.

b)   Inheritance

Inheritance in Java could be outlined as a system wherein a mum or dad object’s properties and behaviors are acquired by one object.

c)   Encapsulation

In Java, the wrapping up strategy of code and knowledge right into a single unit is named Encapsulation. In different phrases, Encapsulation could be outlined as a proactive defend that gives a safeguard to the info from being accessed by the code exterior the defend. The one class of information inside the protective defend can’t be accessed by the opposite knowledge class exterior the defend.

d)   Polymorphism

Polymorphism in Java could be outlined as an idea by which we’ve got a number of methods to carry out a single motion.

Polymorphism combines two Greek phrases, “Poly and Morphs. Poly means many and morphs imply varieties, and the English which means of the mixture of each poly and morphs turns into “many varieties”.

3.   What Do You Perceive About Inheritance In Java?

The Courses primarily based mechanism is termed Inheritance in Object-Oriented Programming.

It’s the course of by which the info members and properties of the mum or dad class are inherited to a toddler class. The category obtained by the method is named a sub-class or a toddler class, whereas the supply class from which the child-class is obtained is named superclass or mum or dad class.

4)  Outline Polymorphism?

Polymorphism is one idea in object-oriented programming meaning having many varieties. In easy phrases, Polymorphism permits an object to have many varieties in OOP. It’s used mostly in OOP on the time when with the intention to confer with a toddler class object, a mum or dad class reference is used. 

By Polymorphism, totally different actions could be carried out in numerous methods. There are two kinds of Polymorphism in OOP.

  • Technique Overloading: Technique overloading could be outlined as one sort of method wherein the behaviour of the strategies depends on the premise of their argument varieties and the variety of the arguments.
  • Operator Overloading: Operator loading in pc programming is typically termed as “advert hoc polymorphism”. It’s a particular case of polymorphism the place totally different operators use totally different implementations on the premise of arguments they’ve. Operator loading could be outlined by a programming language, a programmer, or each.

5)  Record The Totally different Sorts Of Inheritance?

The several types of Inheritance are as follows:

  • Single inheritance
  • A number of Inheritance
  • Multi-level Inheritance
  • Multi-path Inheritance
  • Hierarchical Inheritance
  • Hybrid Inheritance

6) Clarify The distinction between lessons and interfaces?

The variations between lessons and interfaces are enumerated within the succeeding paragraphs.

Objects of a category are created with the intention to instantiate that class. In distinction, instantiation isn’t potential within the interface case due to all its summary strategies that don’t carry out any motion. So instantiating an interface is of no use.

A class is created utilizing class key phrases, whereas an interface is created utilizing the interface.

The members of the category, corresponding to its occasion variables or strategies, can have entry specifiers. The entities supplied by Java assist us limit the scope or visibility of a package deal, class, constructor, strategies, variables, or different knowledge members. These entry modifiers are additionally known as “Visibility Specifiers”. With entry specifiers, members of a category could be restricted to entry or hidden from the opposite lessons. Alternatively, the interface is used to derive one other class, so, all its members are declared as public, and that’s the reason the members of the interface can’t have entry specifiers.

Within the class, the strategies are outlined to carry out some actions on the declared fields, whereas the interface can solely have summary strategies that don’t require implementation for its declaration.

A category can implement any variety of the interface, however it may well solely lengthen one superclass. On the similar time, interfaces can entry any variety of interfaces however can’t carry out any interface.

The aim of a constructor inside a category is to initialize the item’s fields, whereas there are not any fields contained in the interface to initialize. That’s the reason why the interface doesn’t have any constructor.

7. Clarify Software program Improvement Life Cycle

Software program Improvement Life Cycle (SDLC) is a course of wherein systematic steps are taken by the event crew of the software program trade within the phases of design, growth, testing, and upkeep of softwares in order that the high-quality softwares could be produced. It entails assembly the purchasers’ satisfaction and completion of the event of software program inside a time-frame with managed value.

8)   What Do You Perceive By Normalization of Databases, Joins, And Keys?

In a normalizing course of, knowledge is organized in a database effectively. The normalization course of works to attain two targets.

Elimination of redundant knowledge (similar knowledge saved in a number of tables)

To make sure knowledge dependencies make sense (solely associated knowledge is saved in a desk)

Each these targets play a vital position in guaranteeing that the consumption of the quantity of area utilized by a database is lowered and knowledge is saved logically.

9)  Outline Loops

Loop could be outlined as a sequence of directions created in a program construction to execute a block of the assertion (s) repeatedly with a set variety of occasions relying upon the conditional assertion. Within the conditional assertion, situations are outlined as “true or false”, and execution checks these situations for profitable completion. If the situation is “true” then execution happens, and if the situation is “false,” execution is terminated.

10)   Describe Joins, Views, Normalization, Triggers?

Be a part of key phrase is without doubt one of the options of the Structured Question Language. It’s used on the time to question knowledge from a couple of desk. The question relies on a relationship between particular columns in these tables. In databases, the tables are sometimes associated to one another utilizing keys.

Forms of Joins


A View is without doubt one of the important key options of Structured Question Language. 

It’s the form of digital desk that appears precisely like an actual desk and has rows and columns in the identical method as an actual desk. It incorporates the saved question outcomes which are displayed when requested by customers and could be known as up-to-date data.

Normalization is a course of by which the connection between knowledge is structured and dealt with to maintain redundancy minimal within the relational desk and stop the database from pointless anomalies like insertion, replace and delete. These anomalies occurred because of redundancy within the database’s data.

On this course of, massive database tables are divided into small tables, establishing relationships. It helps take away redundant knowledge and gives ease as well as, manipulation, or deletion of desk fields.

A normalization establishes pointers to find out whether or not a relational desk satisfies the traditional type.

A traditional type is a course of by which every relation towards the given standards is evaluated and the multivalued, joins, useful and trivial dependency from a relation is eliminated.

Updation, insertion, or deletion of any knowledge doesn’t create any drawback for database tables, and thus integrity and effectivity of the relational desk are improved.

A set off could be outlined as a process saved in a database that invokes robotically within the case when a particular occasion, corresponding to insertion of a row right into a specified desk, updation of columns of particular tables, and so on., happens within the database.

11) Record Out Totally different Benefits of DBMS

The listing of a number of benefits of DBMS is as follows:

  • Higher knowledge sharing
  • Higher knowledge safety
  • Improved knowledge integration
  • Efficient knowledge entry
  • Enhanced end-user productiveness
  • Improvised determination making
  • Minimal knowledge inconsistency

12) Outline Database Administration System

A Database Administration System is one sort of software program designed primarily to create and handle databases. With the assistance of DBMS, finish customers can construct and keep any database. An interface is supplied by the DBMS between the end-user/utility and the databases.

13) Describe Database Schema?

The operate of a database schema is to signify the logical configuration of a relational database, in a partial or full. Its existence could be within the type of visible illustration or as a sequence of formulation often known as integrity constraints that management a database. An information definition language, corresponding to SQL is used to specific these calculations.

14)  State The Distinction Between The International Key And Reference Key

Using the overseas key’s to attach the secondary desk to the first desk. On the similar time, a reference key’s a main key used on the time of the creation of column degree constraints. With the assistance of a reference key, the database can join two entire tables with a typical constraint.

15)  What are the conditional statements?

The conditional statements known as conditional expressions are a algorithm which are executed when a specific situation is discovered true.

The conditional statements are often known as if-then statements, the place the assertion is executed when the situation is true.

16)  Evaluate the Construction of Bitmap And the b-tree Index

That is a type of TCS interview questions, that when answered appropriately, will depart the interview impressed.

b tree

It’s made with the mixture of department nodes and leaf nodes the place the operate of department node is to carry prefix key worth together with the hyperlink to the leaf node, and the leaf nodes maintain the listed worth and rowed. 


Each single distinct worth is represented by a single bit. It swiftly locates rows in a desk utilizing a string of bits, and it’s used to index columns with low cardinality.

17)  Outline Array

Usually, an array is a set of components of an identical sort, and its components are saved in contiguous reminiscence places. It’s one sort of information construction the place comparable components are saved, and solely a set set of components could be saved in a Java array. It’s index-based, and the primary component is saved at 0 indexes, the second on the first index, and so forth.

18)   What’s Digital Operate and Pure Digital Operate?

Digital Operate

The operate within the base class is asserted as digital to attain Polymorphism in object-oriented programming. The digital operate is often known as the digital methodology. A digital operate or methodology’s conduct could be overridden inside an inheriting class by a operate with the identical signature to offer the polymorphic conduct.

Pure Digital Operate

A pure digital operate is a base class member operate declared within the base class and applied within the derived class. Pure digital capabilities are included solely within the summary lessons.

19)   Clarify the distinction and similarities between C and C++


  • Syntax in each languages is comparable.
  • The code construction is identical in each languages.
  • Each the languages have the identical compilation.
  • The essential syntax is identical. 
  • Most operators and key phrases of the C language are additionally utilized in C++ and have the identical operate.
  • Primary grammar for each languages is identical.
  • Each languages’ main reminiscence mannequin could be very near the {hardware}.
  • Each the languages have the identical notions of the stack, heap, file-scope, and static variables.


  • C isn’t object-oriented programming and therefore doesn’t help Polymorphism, Encapsulation, and Inheritance, whereas C++ helps Polymorphism, Encapsulation, and Inheritance as a result of it’s an object-oriented programming language.
  • C is named a subset of C++, whereas C++ is named a superset of C.
  • C and C++ comprise 32 key phrases and 63 key phrases, respectively.
  • C helps procedural programming for code growth, however C++ is a hybrid language as a result of it helps procedural and object-oriented programming languages.
  • Knowledge and capabilities are separated in C and C++. Knowledge and capabilities are encapsulated collectively within the type of an object.
  • C is a function-driven language, whereas C++ is an object-driven language as a result of it’s object-oriented programming.
  • Constructed-in knowledge varieties are supported in C, whereas Constructed-in & user-defined knowledge varieties are supported in C++.
  • C doesn’t help operate and operator overloading, whereas these each are supported by C. 
  • Within the constructions of C, capabilities should not outlined, whereas, in C++, capabilities can be utilized inside a construction. 
  • C doesn’t have namespace options, however C++ has.
  • C doesn’t help Inheritance, whereas C++ helps Inheritance.
  • Reference variables should not supported by C however are supported by C++.
  • C constructions don’t have entry modifiers, whereas C ++ constructions have entry modifiers.
  • Digital and good friend capabilities should not supported by C, whereas C++ helps digital and good friend capabilities.
  • C focuses on methodology or course of, and C++ focuses on knowledge.
  • scanf() and printf() capabilities are used for enter/output in C whereas cin and cout capabilities are used for enter/output in C++.
  • Header file utilized by C is stdio.h. whereas the Header file utilized by C++ is iostream.h.
  • C gives malloc() and calloc() capabilities for dynamic reminiscence allocation and free() for reminiscence deallocation, whereas  C++ gives a brand new operator for reminiscence allocation and delete operator for reminiscence deallocation.

20)   Outline WPF And WCF


Home windows Presentation Basis (WPF) is a free and open-source graphical subsystem, just like WinForms. 

Microsoft initially developed it to render person interfaces in Home windows-based functions. Beforehand it was often known as “Avalon” and was initially launched as a part of “. NET Framework 3.0” in 2006. WPF offers with presentation (UI)

Using WPF is to construct Home windows consumer functions that run on Home windows working programs. Irs frontend language is XAML, and backend language is C#. 


Home windows Communication Basis (WCF) is a framework identified for constructing service-oriented functions. It offers with communication, and with WCF, knowledge could be despatched within the type of asynchronous messages from the endpoint of 1 service to a different service. Sending and receiving knowledge, formatting, and serialization, all these capabilities are included within the actions of WCF. WCF is getting used to interchange all earlier net service applied sciences from Microsoft. Net companies supplied by WCF are one facet of a a lot bigger set of distant communication capabilities enabled by WCF.


So, who doesn’t wish to land a job in TCS? We’ve grown up listening to our dad and mom discuss so extremely of the corporate and didn’t notice when it turned our dream firm too. With these TCS interview questions, we hope to see you accomplish your dream and get into TCS.

All of the TCS interview questions and solutions we lined on this weblog are ceaselessly requested by the interviewers and may come in useful once you seem for the interview. Enroll your self in licensed on-line programs and PG applications within the subject of your option to upskill your self.



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