Zscaler Softech Softwaretest Engineer Interview Questions and Answers

Q1. Focus on coding, Question: find the duplicate string from list of string and the count of it(how many times it is repeated) Prepare oops and collections concepts.
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Q2. Focus on method overriding
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Q3. Difference between arraylist and LinkedInlist
Ans. 
ArrayList is a resizable array implementation while LinkedList is a doubly linked list implementation.
• ArrayList uses dynamic arrays to store elements, allowing fast random access but slower insertion and deletion.

• LinkedList uses nodes with pointers to the next and previous elements, allowing fast insertion and deletion but slower random access.

• Example: ArrayList - List names = new ArrayList<>(); LinkedList - List citie
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Q4. Use of static keyword
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The static keyword in programming is used to declare variables, methods, or classes that belong to the class itself rather than instances of the class.
• Static variables are shared among all instances of a class.

• Static methods can be called without creating an instance of the class.

• Static classes cannot be instantiated and are used for grouping related methods and variables.

• Example: public static int count = 0; // static
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Top is Love marriage arrange marriage

Q1. What is array and tell array methods
Ans. 
An array is a data structure that stores a collection of elements of the same type in a contiguous memory location.
• Array methods include push() - adds an element to the end of the array

• Array methods also include pop() - removes the last element from the array

• Other array methods are shift() - removes the first element, and unshift() - adds an element to the beginning

• Array methods like splice() - adds or removes elements...read more
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Q2. What is object and tell how its work in js
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An object in JavaScript is a collection of key-value pairs that represent a real-world entity or concept.
• Objects are used to store data and functions together.

• Properties in an object are accessed using dot notation or bracket notation.

• Objects can be created using object literals or constructor functions.
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About technical and aptitude skill

Q1. About yourself and payroll
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Q2. Technical skills and experience
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Q1. About types of testing
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Q2. Use any tool for automation
Ans. 
Selenium is a popular tool for automation testing
• Selenium is widely used for automating web applications

• It supports multiple programming languages like Java, Python, C#

• Selenium WebDriver is used for interacting with web elements

• Selenium Grid allows parallel execution on multiple browsers and platforms
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Q1. What is the importance of manual testing when compared to automation testing
Ans. 
Manual testing is important for exploratory testing, usability testing, and ad-hoc testing.
• Manual testing allows for exploratory testing where testers can explore the application and identify unexpected issues.

• Usability testing, which involves real users interacting with the software, is best done manually to capture user experience.

• Ad-hoc testing, where testers randomly test the application without predefined test cas...read more
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Q2. Real life scenario on web application testing
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Testing a web application for an online shopping platform
• Testing the functionality of adding items to the cart and checking out

• Testing the payment gateway integration for secure transactions

• Testing the search functionality to ensure accurate results are displayed

• Testing the responsiveness of the website on different devices and browsers
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Math and verbal round .

General topics to speak

Q1. Duplicates in array College Projects Hashmap implementation
Ans. 
Implement a function to find duplicates in an array of strings using Hashmap.
• Create a Hashmap to store the frequency of each string in the array

• Iterate through the array and check if the frequency of any string is greater than 1

• If yes, add it to the list of duplicates

• Return the list of duplicates
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Round duration - 60 minutes
Round difficulty - Easy

This was a technical round with questions on DBMS.

Q1. What is data integrity?
Ans. 
Data integrity refers to the accuracy, consistency, and reliability of data throughout its lifecycle.
• Data integrity ensures that data is accurate and consistent in storage and transmission.

• It involves maintaining the quality and reliability of data over time.

• Methods for ensuring data integrity include checksums, encryption, and error detection codes.

• Examples of data integrity violations include data corruption, unautho
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Q2. What is a trigger in the context of a database management system?
Ans. 
A trigger is a special type of stored procedure that automatically executes when certain events occur in a database.
• Triggers are used to enforce business rules, maintain data integrity, and automate repetitive tasks.

• They can be triggered by INSERT, UPDATE, or DELETE operations on a table.

• Examples of triggers include auditing changes to a table, updating related tables when a record is modified, or enforcing referential
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Q3. What is the difference between clustered and non-clustered indexes in a database management system?
Ans. 
Clustered indexes physically order the data in the table, while non-clustered indexes do not.
• Clustered indexes determine the physical order of data in the table, while non-clustered indexes do not.

• A table can have only one clustered index, but multiple non-clustered indexes.

• Clustered indexes are faster for retrieval of data, especially range queries, compared to non-clustered indexes.

• Non-clustered indexes are stored se...read more
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Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions on DBMS.

Q1. What is the difference between UNION and UNION ALL in SQL?
Ans. 
UNION combines and removes duplicates, UNION ALL combines without removing duplicates.
• UNION merges the result sets of two or more SELECT statements and removes duplicates.

• UNION ALL merges the result sets of two or more SELECT statements without removing duplicates.

• UNION is slower than UNION ALL as it involves removing duplicates.

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column...read more
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Q2. What are the functions of a cursor in PL/SQL?
Ans. 
A cursor in PL/SQL is used to retrieve and process multiple rows of data one at a time.
• Allows iteration over a result set

• Retrieves data row by row

• Can be used to update or delete rows in a table

• Must be declared, opened, fetched, and closed
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Q3. Write a SQL query to fetch the nth highest salary from a table.
Ans. 
SQL query to fetch the nth highest salary from a table
• Use the ORDER BY clause to sort salaries in descending order

• Use the LIMIT clause to fetch the nth highest salary
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Round duration - 30 minutes
Round difficulty - Easy

This was a managerial round with typical behavioral problems.