Cleantech Solar Interview Questions, Process, and Tips

Round duration - 60 Minutes
Round difficulty - Medium

It was a mix round. Starting with problem-solving, then data structures, then DBMS, and finally data science
2 Interviewers
Early morning

Q1. 
Water Jug Problem Statement
You have two water jugs with capacities X and Y liters respectively, both initially empty. You also have an infinite water supply. The goal is to determine if it is possible to...read more
Ans. 
The Water Jug Problem involves determining if a target measurement can be achieved using two jugs of different capacities and specific operations.
• Start by filling one jug and transferring water between the jugs to reach the target measurement.

• Consider all possible combinations of filling, emptying, and transferring water between the jugs.

• Keep track of the states of both jugs and the amount of water in each jug during t...read more
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Q2. Balls picking probability problem
Ans. 
The question involves calculating the probability of picking a specific colored ball from a set of balls.
• Calculate the total number of balls in the set

• Determine the number of balls of the specific color in the set

• Divide the number of specific colored balls by the total number of balls to get the probability
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Q3. 
Insertion Sort in a Linked List
Given a singly linked list with 'N' nodes containing integer values, your task is to sort the list using insertion sort and output the sorted list.
Insertion Sort is an al...read more
Ans. 
Implement insertion sort on a singly linked list to sort the elements in-place.
• Iterate through the linked list and for each node, find its correct position in the sorted part of the list

• Adjust pointers to insert the node in the correct position

• Repeat this process until all nodes are sorted
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Q4. Can you explain the different types of keys in a database and their properties?
Ans. 
Different types of keys in a database include primary key, foreign key, unique key, and composite key.
• Primary key: uniquely identifies each record in a table, must be unique and not null.

• Foreign key: establishes a link between two tables, ensures referential integrity.

• Unique key: ensures that all values in a column are unique.

• Composite key: combination of two or more columns to uniquely identify a record.
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Q5. What is the difference between loc and iloc in data science, and can you explain what dashboards are?
Ans. 
loc is label-based indexing while iloc is integer-based indexing in data science. Dashboards are visual tools for data analysis.
• loc is used for selecting rows and columns by labels

• iloc is used for selecting rows and columns by integer position

• Dashboards are visual representations of data for easy analysis and decision-making
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Round duration - 15 Minutes
Round difficulty - Easy

Early morning
Relaxed environment
Very kind and gentle