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BCG Interview Questions and Answers
96 Interview questions
Management consulting involves advising organizations on strategy, operations, and performance improvement to enhance efficiency and effectiveness.
Strategic Planning: Consultants help businesses define their long-term goals and develop strategies to achieve them, such as market entry strategies.
Operational Improvement: They analyze and improve internal processes to increase efficiency, like streamlining supply cha...
The 'is' operator checks if two variables point to the same object in memory, while '==' checks if the values of the two variables are equal.
Use 'is' to check if two variables reference the same object in memory
Use '==' to check if the values of two variables are equal
Example: a = [1, 2, 3]; b = a; a is b will return True, a == b will also return True
Resolving code merge issues in Git involves understanding conflicts and using tools to manage them effectively.
Identify conflicts: Use 'git status' to see which files have conflicts.
Manual resolution: Open conflicted files and look for conflict markers (<<<<<<<, =======, >>>>>>>) to resolve them.
Use merge tools: Tools like 'kdiff3' or 'meld' can help visualize and resolve ...
Django applies migrations to the database using the 'manage.py migrate' command.
Django tracks changes to models and generates migration files accordingly.
The 'manage.py makemigrations' command creates migration files based on model changes.
The 'manage.py migrate' command applies the generated migration files to the database.
Migrations help keep the database schema in sync with the changes in Django models.
What people are saying about BCG
Hoisting in JavaScript is the behavior where variable and function declarations are moved to the top of their containing scope during the compilation phase.
Variable declarations are hoisted to the top of their scope, but not their assignments.
Function declarations are fully hoisted, meaning they can be called before they are declared.
Hoisting can lead to unexpected behavior if not understood properly.
SQL window functions are used to perform calculations across a set of table rows related to the current row.
Window functions operate on a set of rows related to the current row, known as a window.
They can be used to calculate running totals, ranks, averages, and more.
Common window functions include ROW_NUMBER(), RANK(), DENSE_RANK(), SUM(), AVG(), and LEAD().
List is an ordered collection of elements with duplicates allowed, while set is an unordered collection of unique elements.
List maintains the order of elements, while set does not guarantee any specific order.
List allows duplicate elements, while set does not allow duplicates.
List is accessed by index, while set is accessed by value.
Example: List - [1, 2, 3, 1], Set - {1, 2, 3}
Concat is used to combine data along a particular axis, while merge is used to combine data based on a common key.
Concatenation is done along an axis (rows or columns) in pandas, while merging is done based on common columns or indices.
Concatenation is a simple operation that just appends data, while merging involves combining data based on a key.
Concatenation can be done even if the data does not have common colu...
Custom Django admin commands can be written to perform specific tasks in the Django admin interface.
Create a management/commands directory inside your Django app directory
Create a Python file for your custom command inside the management/commands directory
Define a class that extends BaseCommand and implement the handle method to execute the command logic
Register the custom command in the Django admin interface by ...
ALL() ignores all filters in the query context, while ALLSELECTED() ignores only filters on columns in the visual.
ALL() removes all filters from the specified column or table.
ALLSELECTED() removes filters from the specified column or table, but keeps filters on other columns in the visual.
Example: ALL('Table') would remove all filters on the 'Table' in the query context.
Example: ALLSELECTED('Column') would remove ...
BCG Interview Experiences
203 interviews found
Anonymous
I appeared for an interview in Jan 2025.
(5 Questions)
- Q1. Basics of Python, Flask, ReactJs, RestApi Development
- Q2. Python - Difference between is and ==
- Ans.
The 'is' operator checks if two variables point to the same object in memory, while '==' checks if the values of the two variables are equal.
Use 'is' to check if two variables reference the same object in memory
Use '==' to check if the values of two variables are equal
Example: a = [1, 2, 3]; b = a; a is b will return True, a == b will also return True
- Q3. React - useEffect vs useState
- Ans.
useEffect is used for side effects in functional components, while useState is used for managing state.
useEffect is used to perform side effects in functional components, like data fetching, subscriptions, or manually changing the DOM
useState is used to manage state in functional components, allowing the component to re-render when the state changes
Example: useEffect can be used to fetch data from an API when the compo...
- Q4. Authentication in RestApi
- Ans.
Authentication in RestApi involves verifying the identity of users before granting access to resources.
Use tokens (JWT) for authentication
Implement OAuth for secure authentication
Utilize session management for user authentication
Implement two-factor authentication for added security
- Q5. React - Pure Component and Higher order components
I applied via Approached by Company and was interviewed in Dec 2024. There were 3 interview rounds.
Asked coding questions on Python and SQL
Python - find longest non repeating substring
SQL - join and window function
Develop a production-grade application in Python that analyzes data and provides answers to questions based on the dataset.
(2 Questions)
- Q1. System design and project based questions
- Q2. Scenario-based questions that can help assess how you handle various situations
Interview Preparation Tips
- Coding
- System Design
- Managerial
I applied via Naukri.com and was interviewed in Dec 2024. There were 2 interview rounds.
(2 Questions)
- Q1. How does Django apply migrations to the database?
- Ans.
Django applies migrations to the database using the 'manage.py migrate' command.
Django tracks changes to models and generates migration files accordingly.
The 'manage.py makemigrations' command creates migration files based on model changes.
The 'manage.py migrate' command applies the generated migration files to the database.
Migrations help keep the database schema in sync with the changes in Django models.
- Q2. What is hoisting in javascript?
Create a full stack application in 3 days.
Skills evaluated in this interview
I applied via Walk-in and was interviewed in Dec 2024. There were 3 interview rounds.
(2 Questions)
- Q1. About Project and expertise
- Q2. Why BCG?
- Ans.
BCG offers a challenging and innovative work environment with opportunities for growth and development.
BCG is known for its cutting-edge technology and innovative projects
Opportunities for professional growth and development
Strong company culture focused on collaboration and teamwork
(1 Question)
- Q1. Polymorphism, OS Deadlock
(1 Question)
- Q1. More about how to resolved code merge issue in Git
- Ans.
Resolving code merge issues in Git involves understanding conflicts and using tools to manage them effectively.
Identify conflicts: Use 'git status' to see which files have conflicts.
Manual resolution: Open conflicted files and look for conflict markers (<<<<<<<, =======, >>>>>>>) to resolve them.
Use merge tools: Tools like 'kdiff3' or 'meld' can help visualize and resolve confl...
(2 Questions)
- Q1. Why are you looking for a change?
- Q2. Salary expectations.
(2 Questions)
- Q1. Basics of Python, Selenium, HTML/CSS, Locators, Testing Concepts
- Q2. Solve a case study, based on a real-world problem
(2 Questions)
- Q1. Same as previous.
- Q2. More difficult case study, managerial questions.
(2 Questions)
- Q1. Previous experience, explain the current working method, and how you can improve.
- Q2. My expectations from the company
- Ans.
I expect a collaborative environment, opportunities for growth, and a commitment to quality in software development.
A supportive team culture that encourages open communication and collaboration, like regular team meetings to discuss challenges.
Opportunities for professional development, such as access to training programs or workshops to enhance my skills.
A focus on quality assurance processes, ensuring that the softw...
Interview Preparation Tips
I applied via Approached by Company and was interviewed in Apr 2024. There were 4 interview rounds.
Contained only mcq questions related to maths and reasoning
(2 Questions)
- Q1. How to detect two loops in a linkedlist
- Ans.
Use Floyd's Cycle Detection Algorithm to detect two loops in a linked list.
Initialize two pointers, slow and fast, both starting at the head of the linked list.
Move slow pointer by one step and fast pointer by two steps in each iteration.
If they meet at some point, there is a loop. Reset one pointer to head and move both by one step until they meet again to find the start of the loop.
- Q2. Mainly all the basics questions on DSA and C++ Language and all the ds like stacks, linkedlist, tree, array, queue,map difference between queue and stack
(3 Questions)
- Q1. Questions on project
- Q2. Code simple que like reverse the string in every possible language that is mentioned on yor resume ,like node js react or python and even c language
- Q3. Basics questions of os like deadlocks
(1 Question)
- Q1. I was note selected for this round
Interview Preparation Tips
- DSA
- React
- SQL
- Linkedlist
- array
Skills evaluated in this interview
(2 Questions)
- Q1. Power BI Difference between ALL() and ALLSELECTED()
- Ans.
ALL() ignores all filters in the query context, while ALLSELECTED() ignores only filters on columns in the visual.
ALL() removes all filters from the specified column or table.
ALLSELECTED() removes filters from the specified column or table, but keeps filters on other columns in the visual.
Example: ALL('Table') would remove all filters on the 'Table' in the query context.
Example: ALLSELECTED('Column') would remove filte...
- Q2. Excel Difference between COUNT() and COUNTA()
- Ans.
COUNT() counts only numeric values, while COUNTA() counts all non-empty cells.
COUNT() counts only cells with numerical values.
COUNTA() counts all non-empty cells, including text and errors.
Example: COUNT(A1:A5) will count only cells with numbers, while COUNTA(A1:A5) will count all non-empty cells.
(2 Questions)
- Q1. Resume based questions like explain the projects that you have done.
- Q2. Sample dataset questions
Skills evaluated in this interview
I applied via Naukri.com and was interviewed in Jun 2024. There were 3 interview rounds.
(1 Question)
- Q1. Technical questions on GenAI
(1 Question)
- Q1. Technical high level questions on Previous projects
(1 Question)
- Q1. Team handling and other case based scenario questions
I applied via Naukri.com and was interviewed in Aug 2024. There was 1 interview round.
(2 Questions)
- Q1. How to write custom django admin commands
- Ans.
Custom Django admin commands can be written to perform specific tasks in the Django admin interface.
Create a management/commands directory inside your Django app directory
Create a Python file for your custom command inside the management/commands directory
Define a class that extends BaseCommand and implement the handle method to execute the command logic
Register the custom command in the Django admin interface by addin...
- Q2. Python decorator
Skills evaluated in this interview
I appeared for an interview in Mar 2025, where I was asked the following questions.
- Q1. React basics questions ,
- Q2. Oops concept Dsa medium questions
BCG Interview FAQs
Some of the top questions asked at the BCG interview -
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