eBay Quality Inspector Interview Questions and Answers

Alpha testing is done by internal teams, while beta testing involves external users.

• Alpha testing is conducted by the development team or quality assurance team within the organization.

• It is performed in a controlled environment before the software is released to the public.

• Alpha testing helps identify bugs, usability issues, and performance problems.

• Beta testing involves external users who are not part of the developm...read more

QA focuses on preventing defects, while QC focuses on identifying and fixing defects.

• QA stands for Quality Assurance and is a proactive process that focuses on preventing defects by establishing processes and standards.

• QC stands for Quality Control and is a reactive process that focuses on identifying and fixing defects through testing and inspection.

• QA involves activities like requirement analysis, test planning, and ...read more

Developers write code to create software, while testers ensure the quality of the software by finding and reporting bugs.

• Developers write code, while testers test the code.

• Developers focus on creating software features, while testers focus on finding bugs and ensuring quality.

• Developers work on the implementation, while testers work on the validation.

• Developers are responsible for coding and debugging, while testers ar...read more

Testing is necessary to ensure the quality and reliability of software applications.

• Identifies defects and bugs in the software

• Verifies that the software meets the specified requirements

• Ensures the software functions correctly in different environments

• Enhances user experience by identifying and fixing usability issues

• Reduces the risk of software failures and downtime

• Saves time and money by detecting issues early in the...read more

System, black box, and whitebox testing are different approaches to testing software.

• System testing is performed on the complete system to ensure that all components work together as expected.

• Black box testing focuses on testing the functionality of the software without considering its internal structure.

• Whitebox testing involves testing the internal structure and implementation of the software.

• System testing is perfor...read more

I prioritize tasks, communicate effectively, and adapt my plans to manage interruptions while maintaining productivity.

• Assess the interruption: Determine its urgency and importance. For example, if a team member needs immediate help, I prioritize that.

• Reorganize my tasks: I create a new plan that accommodates the interruption while ensuring critical deadlines are met.

• Communicate with stakeholders: I inform my team or m...read more

PreOrder traversal without recursion is done using a stack to simulate the function call stack.

• Create an empty stack and push the root node onto it.

• While the stack is not empty, pop a node from the stack and process it.

• Push the right child of the popped node onto the stack if it exists.

• Push the left child of the popped node onto the stack if it exists.

Yes

• Create an empty binary search tree (BST)

• Loop over the unsorted array

• For each element, insert it into the BST using the appropriate insertion logic

• Repeat until all elements are inserted

• The resulting BST will be built from the unsorted array

The question asks to find two elements in an array whose sum is equal to a given number.

• Iterate through the array and for each element, check if the difference between the given number and the current element exists in the array.

• Use a hash set to store the elements as you iterate through the array for efficient lookup.

• Return the pair of elements if found, otherwise return a message indicating no such pair exists.

There are two types of triggers: DML triggers and DDL triggers.

• DML triggers are fired in response to DML (Data Manipulation Language) statements like INSERT, UPDATE, DELETE.

• DDL triggers are fired in response to DDL (Data Definition Language) statements like CREATE, ALTER, DROP.

• Examples: A DML trigger can be used to log changes made to a table, while a DDL trigger can be used to enforce certain rules when a table is alt...read more

Yes, triggers can be used with select statements in SQL.

• Triggers are database objects that are automatically executed in response to certain events, such as insert, update, or delete operations.

• While triggers are commonly used with insert, update, and delete statements, they can also be used with select statements.

• Using triggers with select statements allows you to perform additional actions or validations before or af...read more

Indexing in MySQL improves query performance. There are several types of indexing in MySQL.

• Indexes are used to quickly locate data without scanning the entire table.

• Types of indexing in MySQL include B-tree, hash, full-text, and spatial indexes.

• B-tree indexes are the most common and suitable for most use cases.

• Hash indexes are used for exact match lookups.

• Full-text indexes are used for searching text-based data efficie...read more

Engines in MySQL are the underlying software components that handle storage, indexing, and querying of data.

• MySQL supports multiple storage engines, each with its own strengths and features.

• Some commonly used engines in MySQL are InnoDB, MyISAM, and Memory.

• InnoDB is the default engine in MySQL and provides support for transactions and foreign keys.

• MyISAM is known for its simplicity and speed but lacks transaction suppo...read more

The Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Restricts instantiation of a class to a single object.

• Useful for managing shared resources, like database connections.

• Implemented using private constructors and static methods.

• Example in Java: public class Singleton { private static Singleton instance; private Singleton() {} public static Singleton getInstance() { if...read more

Yes, a constructor can be private.

• A private constructor can only be accessed within the class itself.

• It is often used in singleton design pattern to restrict object creation.

• Private constructors are also useful for utility classes that only contain static methods.