Qubole Interview Questions and Answers

This will be a general apptitude test where a questionnaire is consist of reasoning, English and Maths questions

Q1. Tell us about yourself
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Q2. What do you know about our company
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Q3. Where do you see yourself in the next 5 years
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Q1. *Introduce yourself *Purpose of working in the Company *Educational Background *Family Background *Goals and Ambition
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Round duration - 180 Minutes
Round difficulty - Medium

The test was started in the evening 4pm approx.
It was flexible due to Corona so we gave the test from our home only.
It had listening skill activity too according to which we were marked .
Interviewer was very supportive because of which it was easier for us to open up easily .

Q1. 
Arithmetic Expression Evaluation Problem Statement
You are provided with a string expression consisting of characters '+', '-', '*', '/', '(', ')' and digits '0' to '9', representing an arithmetic express...read more
Ans. 
Evaluate arithmetic expressions in infix notation with given operators and precedence rules.
• Parse the infix expression to postfix using a stack and then evaluate the postfix expression using another stack

• Use a stack to keep track of operators and operands while parsing the expression

• Handle operator precedence and associativity rules while converting to postfix and evaluating the expression
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Q2. 
Valid Parentheses Problem Statement
Given a string 'STR' consisting solely of the characters “{”, “}”, “(”, “)”, “[” and “]”, determine if the parentheses are balanced.
Input:
The first line contains an...read more
Ans. 
The task is to determine if a given string of parentheses is balanced or not.
• Iterate through the characters of the string and use a stack to keep track of opening parentheses.

• When encountering an opening parenthesis, push it onto the stack. When encountering a closing parenthesis, check if it matches the top of the stack.

• If the stack is empty at the end or there are unmatched parentheses, the string is not balanced.

• Exa...read more
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Round duration - 20 Minutes
Round difficulty - Medium

Interview

Q1. 
Reverse Number Problem Statement
Ninja is exploring new challenges and desires to reverse a given number. Your task is to assist Ninja in reversing the number provided.
Note:
If a number has trailing ze...read more
Ans. 
Implement a function to reverse a given number, omitting trailing zeros.
• Create a function that takes an integer as input and reverses it while omitting trailing zeros

• Use string manipulation to reverse the number and remove any trailing zeros

• Handle test cases where the number has leading zeros as well

• Ensure the reversed number is printed for each test case on a new line
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Q1. Java. Spring boot, micro service, hibernate
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Q1. Salary, technical, company details
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Q1. What is Polymorphism and it’s type?
Ans. 
Polymorphism is the ability of an object to take on many forms. It allows objects of different classes to be treated as if they were of the same class.
• Polymorphism is achieved through method overriding and method overloading.

• Method overriding is when a subclass provides a specific implementation of a method that is already provided by its parent class.

• Method overloading is when a class has two or more methods with the ...read more
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Q2. What is Dependency Injection?
Ans. 
Dependency Injection is a design pattern where the dependencies of an object are injected into it rather than created within it.
• It helps in achieving loose coupling between objects

• It makes testing easier as dependencies can be mocked or stubbed

• There are three types of Dependency Injection - Constructor Injection, Setter Injection, and Interface Injection

• Example: In a web application, the database connection object can ...read more
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Q3. How Garbage Collection works in .Net?
Ans. 
Garbage Collection in .Net automatically manages memory by freeing up unused objects.
• Garbage Collector runs in the background and periodically checks for unused objects.

• It frees up memory by deallocating objects that are no longer being used.

• GC can be configured using different modes like Server, Workstation, Concurrent, etc.

• GC can also be manually triggered using GC.Collect() method.

• GC.SuppressFinalize() method can be...read more
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Q4. What is LINQ and some basic concept related it?
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