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Black Opal Interview Questions and Answers

Updated 14 Feb 2024

Black Opal Interview Experiences

1 interview found

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
-

I applied via Referral and was interviewed in Aug 2023. There was 1 interview round.

Round 1 - Technical 

(2 Questions)

  • Q1. Frontend optmization
  • Q2. Explain unit testing
  • Ans. 

    Unit testing is a software testing method where individual units or components of a software are tested in isolation.

    • Unit testing helps ensure that each part of the software functions correctly on its own.

    • It allows for early detection of bugs and issues in the code.

    • Unit tests are typically automated and run frequently during the development process.

    • Examples of unit testing frameworks include JUnit for Java and NUnit fo

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Be yourself and revisit the basics of coding and ensure you have dabbled in social media like app from technical documentation to development

Skills evaluated in this interview

Software Developer Interview Questions asked at other Companies

Q1. Maximum Subarray Sum Problem Statement Given an array of integers, determine the maximum possible sum of any contiguous subarray within the array. Example: Input: array = [34, -50, 42, 14, -5, 86] Output: 137 Explanation: The maximum sum is... read more
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Jobs at Black Opal

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Interview questions from similar companies

I applied via Walk-in and was interviewed before Sep 2020. There were 4 interview rounds.

Interview Questionnaire 

1 Question

  • Q1. A lot questions.

Interview Preparation Tips

Interview preparation tips for other job seekers - I came in HCL without any reference, Randomly I came to give interview. there were total 3 rounds I faced. 1 Round Technical. 2nd Technial. 3 HR . For clearing technical round in HCL you should be technically strong. My 1st round took more than a hour and 2nd round took nearly 45 mins. Your basics should be clear and strong.

I appeared for an interview before Jul 2020.

Interview Questionnaire 

1 Question

  • Q1. Is Infosys listed?
  • Ans. 

    Yes, Infosys is listed on the Indian stock exchanges as well as on the NYSE.

    • Infosys is listed on the Bombay Stock Exchange (BSE) and National Stock Exchange of India (NSE)

    • It is also listed on the New York Stock Exchange (NYSE)

    • Infosys has a market capitalization of over $80 billion as of 2021

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare well in advance

Interview Questionnaire 

1 Question

  • Q1. Time management

I applied via Company Website and was interviewed before Feb 2020. There was 1 interview round.

Interview Questionnaire 

2 Questions

  • Q1. They asked about dbms questions in the form of table formate
  • Q2. They asked code for some python program

Interview Preparation Tips

Interview preparation tips for other job seekers - Firstly they conducted computer based technical exam and then after qualifying that then we will go for face face interview and then lastly HR round will be held.

I applied via Naukri.com and was interviewed before May 2020. There were 3 interview rounds.

Interview Questionnaire 

2 Questions

  • Q1. Explain me about yourself
  • Q2. Just be brief don't bore them

Interview Preparation Tips

Interview preparation tips for other job seekers - Be bold and confident.

I applied via Campus Placement and was interviewed before Sep 2019. There were 5 interview rounds.

Interview Questionnaire 

7 Questions

  • Q1. 1.What is Opps concepts in Java.
  • Ans. 

    OOPs concepts in Java are the fundamental principles of object-oriented programming.

    • Encapsulation: wrapping data and code into a single unit

    • Inheritance: creating new classes from existing ones

    • Polymorphism: using a single interface to represent multiple types

    • Abstraction: hiding implementation details from the user

    • Examples: class, object, inheritance, polymorphism, encapsulation

  • Answered by AI
  • Q2. 2.What is difference between stack and queue?
  • Ans. 

    Stack is a LIFO data structure while Queue is a FIFO data structure.

    • Stack follows Last In First Out (LIFO) principle while Queue follows First In First Out (FIFO) principle.

    • Stack has two main operations: push and pop while Queue has two main operations: enqueue and dequeue.

    • Stack is used in recursive function calls, undo/redo operations, and backtracking while Queue is used in breadth-first search, printing tasks in ord...

  • Answered by AI
  • Q3. 3.Write SQL query to find second highest salary in database?
  • Ans. 

    SQL query to find second highest salary in database

    • Use ORDER BY and LIMIT to get the second highest salary

    • Assume ties are allowed and use DISTINCT

  • Answered by AI
  • Q4. 4. Difference Between method overloading and method overriding?
  • Ans. 

    Method overloading is having multiple methods with the same name but different parameters. Method overriding is having a method in a subclass with the same name and parameters as a method in its superclass.

    • Method overloading is done within the same class while method overriding is done in different classes (subclass and superclass).

    • Method overloading is achieved by changing the number of parameters or the data type of ...

  • Answered by AI
  • Q5. 5.which is the parent class of all classes in Java?
  • Ans. 

    The parent class of all classes in Java is the Object class.

    • All classes in Java implicitly extend the Object class.

    • The Object class provides basic methods such as toString(), equals(), and hashCode().

    • Any class can override these methods to provide custom implementations.

    • Example: public class MyClass extends Object { ... }

    • Example: Object obj = new MyClass();

  • Answered by AI
  • Q6. Explain your final year project?
  • Q7. Difference between SQL and NoSql database?
  • Ans. 

    SQL databases are relational and use structured query language, while NoSQL databases are non-relational and use various data models.

    • SQL databases are based on a fixed schema, while NoSQL databases are schema-less.

    • SQL databases use tables to store data, while NoSQL databases use various data models like key-value, document, columnar, or graph.

    • SQL databases are better suited for complex queries and structured data, whil...

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - All interview process are easy. Intervier just ask basic concept of related to your stream.

Skills evaluated in this interview

I applied via Company Website and was interviewed before Oct 2019. There were 4 interview rounds.

Interview Questionnaire 

1 Question

  • Q1. Tell me about your self

Interview Preparation Tips

Interview preparation tips for other job seekers - Be bold, don't hesitate.

I applied via Naukri.com and was interviewed before Oct 2020. There were 3 interview rounds.

Interview Questionnaire 

1 Question

  • Q1. Duration of the project and team environment

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare well with latest technologies.

I applied via Naukri.com and was interviewed before Jun 2021. There was 1 interview round.

Round 1 - HR 

(2 Questions)

  • Q1. Tell me about yourself
  • Q2. Why left previous organisation

Interview Preparation Tips

Interview preparation tips for other job seekers - Just be confident. And answer with eye contact

Black Opal Interview FAQs

How many rounds are there in Black Opal interview?
Black Opal interview process usually has 1 rounds. The most common rounds in the Black Opal interview process are Technical.
How to prepare for Black Opal interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at Black Opal. The most common topics and skills that interviewers at Black Opal expect are Channel Partners, Digital Marketing, Brand Promotion, Communication Skills and Customer Satisfaction.
What are the top questions asked in Black Opal interview?

Some of the top questions asked at the Black Opal interview -

  1. Explain unit test...read more
  2. Frontend optmizat...read more

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Black Opal Interview Process

based on 1 interview

Interview experience

3
  
Average
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Assistant Manager Sales

Noida

4-8 Yrs

Not Disclosed

Team Leader Sales

Noida

4-8 Yrs

Not Disclosed

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