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Caliber Technologies

3.6
based on 162 Reviews
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Volttic Interview Questions and Answers

Updated 6 Apr 2024

Q1. What is the difference between class and object?

Ans.

A class is a blueprint or template for creating objects, while an object is an instance of a class.

  • A class defines the properties and methods that an object will have.

  • An object is created from a class using the 'new' keyword.

  • Multiple objects can be created from a single class.

  • Objects can have different values for their properties, while the class defines the structure.

  • Classes can inherit properties and methods from other classes, while objects cannot.

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Q2. What is a primary key?

Ans.

A primary key is a unique identifier for a record in a database table.

  • It must be unique for each record in the table

  • It cannot be null or empty

  • It is used to establish relationships between tables

  • Examples: social security number, email address, student ID

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Q3. What is a foreign key?

Ans.

A foreign key is a column or set of columns in a table that refers to the primary key of another table.

  • It establishes a relationship between two tables.

  • It ensures referential integrity.

  • It can be used to join tables in a query.

  • Example: CustomerID in Orders table refers to the CustomerID in Customers table.

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Q4. What is a unique key?

Ans.

A unique key is a field or combination of fields that uniquely identifies a record in a database table.

  • A unique key ensures that no two records in a table have the same values for the key fields.

  • It can be a single field or a combination of fields.

  • It is used to enforce data integrity and to facilitate efficient data retrieval.

  • Examples include primary keys, candidate keys, and alternate keys.

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Q5. What is inheritance?

Ans.

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

  • Inheritance allows code reusability and saves time and effort in coding.

  • The existing class is called the parent or base class, and the new class is called the child or derived class.

  • The child class inherits all the properties and methods of the parent class and can also add its own unique properties and methods.

  • For example, a class 'Animal' can ...read more

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Q6. Identifying xpaths

Ans.

Identifying xpaths is crucial for locating elements on a web page for testing purposes.

  • Use browser developer tools to inspect elements and generate xpaths

  • Consider using unique attributes or text within the element to create reliable xpaths

  • Avoid using absolute xpaths as they can be brittle and prone to breaking

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