Knoldus Inc QA Intern Interview Questions and Answers

25 MCQ questions online with time limit

Create webapp . Frontend, Backend , data encryption

Q1. What are the 4 principles of oops?
Ans. 
The 4 principles of OOP are Inheritance, Encapsulation, Abstraction, and Polymorphism.
• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation restricts access to certain components within a class, protecting the data.

• Abstraction hides complex implementation details and only shows the necessary features.

• Polymorphism allows objects to be treated as instances of their parent class.
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Q2. What is the difference between string buffer and string builder?
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String buffer is synchronized and thread-safe, while string builder is not synchronized and faster.
• String buffer is synchronized, making it thread-safe for use in multi-threaded environments.

• String builder is not synchronized, providing better performance in single-threaded applications.

• String builder is faster than string buffer due to lack of synchronization overhead.

• Example: StringBuffer sb = new StringBuffer(); Str
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Q3. Why strings are immutable?
Ans. 
Strings are immutable in order to ensure data integrity and security.
• Immutable strings prevent accidental data modification, ensuring data integrity.

• Immutable strings enhance security by preventing unauthorized access or tampering.

• Immutable strings allow for more efficient memory management and optimization.

• Example: 'Hello' cannot be changed to 'Hella' directly, a new string must be created.
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Q4. What are the different types of exception in java?
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There are two types of exceptions in Java: checked exceptions and unchecked exceptions.
• Checked exceptions are checked at compile time and must be handled using try-catch or throws keyword.

• Unchecked exceptions are not checked at compile time and include RuntimeException and its subclasses.

• Examples of checked exceptions include IOException, SQLException, and ClassNotFoundException.

• Examples of unchecked exceptions include...read more
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Q5. Explain linear search algorithm.
Ans. 
Linear search is a simple searching algorithm that sequentially checks each element in a list until a match is found.
• Iterate through each element in the list

• Compare the current element with the target value

• Return the index if a match is found, otherwise return -1
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Q6. Difference between JDK jvm and jre
Ans. 
JDK includes JRE and development tools, while JRE includes only the Java Runtime Environment.
• JDK stands for Java Development Kit, which includes JRE and development tools like compilers and debuggers.

• JRE stands for Java Runtime Environment, which includes JVM and libraries necessary to run Java applications.

• JVM stands for Java Virtual Machine, which is responsible for executing Java bytecode.

• JDK is used for developing ...read more
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It was online 60min test.

It was offline 30 min test.

Q1. Oops,dbms,css,html,dsa,java.
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Q2. It was very friendly .
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Basic english , Maths (distance, speed, ratio, probability)

Q1. What are different tests
Ans. 
Different tests in software testing include unit testing, integration testing, system testing, and acceptance testing.
• Unit testing focuses on testing individual components or modules of the software.

• Integration testing checks if different modules work together correctly.

• System testing validates the entire system against the requirements.

• Acceptance testing ensures that the software meets the user's expectations.

• Other ty...read more
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Q2. Give examples on test cases
Ans. 
Test cases are scenarios designed to validate the functionality of a software application.
• Testing login functionality with valid credentials

• Testing login functionality with invalid credentials

• Testing password reset functionality

• Testing search functionality with different input values
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Q3. Basic testing knowledge
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Q1. Los process of loans
Ans. 
The process of loans involves application, approval, disbursement, and repayment.
• Application: Borrower submits loan application with required documents.

• Approval: Lender reviews application, checks creditworthiness, and decides whether to approve or deny.

• Disbursement: If approved, funds are disbursed to borrower.

• Repayment: Borrower makes scheduled payments to repay the loan amount.

• Examples: Personal loans, home loans, c
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Q2. Explain Defect life cycle
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Defect life cycle is the process of identifying, reporting, fixing, retesting, and closing defects in a software application.
• Defect identification: Defects are identified by testers during testing.

• Defect reporting: Testers report defects in a defect tracking tool.

• Defect fixing: Developers fix the reported defects.

• Defect retesting: Testers retest the fixed defects to ensure they are resolved.

• Defect closing: Once the def
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Q3. Difference between sanity, smoke and regression testing
Ans. 
Sanity testing is a quick test to check if the software is stable, smoke testing is a subset of sanity testing focusing on critical functionalities, and regression testing is retesting after code changes.
• Sanity testing is a narrow and deep testing to ensure that the most critical functionalities work correctly after changes.

• Smoke testing is a broad and shallow testing to ensure that the basic functionalities work befor...read more
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Q4. Different types of https methods in api testing
Ans. 
Different types of https methods in api testing include GET, POST, PUT, DELETE, PATCH, OPTIONS, HEAD.
• GET - Used to retrieve data from the server

• POST - Used to submit data to the server

• PUT - Used to update existing data on the server

• DELETE - Used to delete data on the server

• PATCH - Used to partially update data on the server

• OPTIONS - Used to check what HTTP methods are supported by the server

• HEAD - Used to retrieve head
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Q1. Tell me about your self
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Q2. Banking domain related questions
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