Ozibook Data Analyst Intern Interview Questions and Answers

Time series and regression

Queries and commands

It was a training+ internship

Q1. NUmber of groups and group wise projects
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Aptitude test was the basics asked in every exam

Q1. What is difference between 4stroke and 2 stroke engine?
Ans. 
4-stroke engines have 4 strokes per cycle, while 2-stroke engines have 2 strokes per cycle.
• 4-stroke engines are more fuel-efficient and produce less pollution than 2-stroke engines.

• 2-stroke engines are simpler and lighter than 4-stroke engines.

• 4-stroke engines have separate intake, compression, power, and exhaust strokes, while 2-stroke engines combine intake and compression, and power and exhaust strokes.

• Examples of 4...read more
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Q2. What is a bevel gear? Give an example
Ans. 
A bevel gear is a type of gear used to transmit power between shafts at an angle.
• Bevel gears have conical shapes and are used to change the direction of rotation.

• They are commonly used in automobiles, airplanes, and power plants.

• An example of a bevel gear is the ring and pinion gear in a car's differential.

• Another example is the bevel gear used in a hand drill to transmit power from the motor to the chuck.
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Q1. Question from pseudo code, ds and grammar are asked
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Q1. Tell me about yourself
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Q2. Exception handling in java
Ans. 
Exception handling in Java allows for the handling of errors and exceptions that may occur during program execution.
• Java provides try-catch blocks to handle exceptions.

• The try block contains the code that may throw an exception.

• The catch block catches and handles the thrown exception.

• Multiple catch blocks can be used to handle different types of exceptions.

• The finally block is optional and is executed regardless of whe...read more
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Q3. Memory management in java
Ans. 
Memory management in Java involves automatic garbage collection and manual memory allocation.
• Java uses automatic garbage collection to free up memory

• Developers can manually allocate memory using the 'new' keyword

• Java also has a 'finalize' method to clean up resources before garbage collection

• Memory leaks can occur if objects are not properly released
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Q4. What is Hash map in java
Ans. 
Hash map is a data structure that stores key-value pairs and allows fast retrieval of values based on keys.
• Hash map uses hashing to store and retrieve values based on keys

• It allows null values and null keys

• It is not synchronized and not thread-safe

• Example: HashMap map = new HashMap<>();

• map.put("apple", 1); int value = map.get("apple");
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Q5. Primary key and candidate key difference
Ans. 
Primary key uniquely identifies a record while candidate key can also uniquely identify a record but may not be chosen as primary key.
• Primary key is a column or set of columns that uniquely identifies each record in a table

• Candidate key is a column or set of columns that can also uniquely identify each record in a table

• A table can have multiple candidate keys but only one primary key

• Primary key cannot have null values ...read more
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Q6. Super key and foreign key difference
Ans. 
Super key is a set of attributes that uniquely identifies a record, while foreign key is a reference to a primary key in another table.
• Super key is a combination of one or more attributes that uniquely identifies a record in a table.

• Foreign key is a field in a table that refers to the primary key of another table.

• Super key can have additional attributes that are not necessary for uniqueness.

• Foreign key establishes a re...read more
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Q7. List all languages in Sql and explain
Ans. 
List of SQL languages and their brief explanation
• SQL (Structured Query Language) is a standard language for managing relational databases

• T-SQL (Transact-SQL) is a proprietary extension of SQL used by Microsoft SQL Server

• PL/SQL (Procedural Language/Structured Query Language) is Oracle Corporation's proprietary extension of SQL

• MySQL is an open-source relational database management system that uses SQL

• PostgreSQL is an ope...read more
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Q8. And some questions related to project
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