Junior Developer

Junior Developer Interview Questions and Answers for Freshers

Updated 2 Apr 2025

Q1. Difference between truncate delete Ddl dml commands Primary key unique key defination difference Composite key Foreign key Code to link two tables Sql-foreign key Print name and marks of stu with max marks Oops...

Ans.

The question covers various topics related to database management, SQL, and object-oriented programming concepts.

Truncate is a DDL command used to delete all records from a table, while delete is a DML command used to remove specific records.
Primary key uniquely identifies each record in a table, while a unique key ensures that all values in a column are unique.
Composite key is a combination of multiple columns that uniquely identify a record in a table.
Foreign key establishe...read more

Q2. What is your experience in web developing?

Ans.

I have 2 years of experience in web development, working with HTML, CSS, JavaScript, and various frameworks.

2 years of experience in web development
Proficient in HTML, CSS, and JavaScript
Familiar with various frameworks like React and Angular
Developed responsive and interactive websites

Q3. What is the code to determine whether a number is even or odd?

Ans.

To determine if a number is even or odd, check the remainder when divided by 2.

Use the modulus operator (%) to find the remainder.
If number % 2 == 0, the number is even.
If number % 2 != 0, the number is odd.
Example: 4 % 2 == 0 (even), 5 % 2 != 0 (odd).

Q4. Tell us about your background and any programming languages you've worked with.

Ans.

I have a background in computer science with experience in various programming languages including Python, Java, and JavaScript.

Completed a Bachelor's degree in Computer Science, where I learned foundational programming concepts.
Worked on a project using Python to develop a web scraper that collects data from multiple websites.
Gained experience in Java through building a simple Android application for tracking personal expenses.
Utilized JavaScript and React to create a respon...read more

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Q5. What are the key concepts of Object-Oriented Programming (OOP)?

Ans.

OOP is a programming paradigm based on objects that encapsulate data and behavior, promoting code reusability and organization.

Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).
Inheritance: Mechanism to create a new class from an existing class, inheriting its properties (e.g., a 'Dog' class inheriting from an 'Animal' class).
Polymorphism: Ability to present the same interface for different data types (e.g., a function that can ...read more

Q6. How do you approach debugging a program or code?

Ans.

I systematically identify and resolve issues in code through a structured debugging process.

Reproduce the issue: Ensure the bug can be consistently replicated.
Check error messages: Analyze any error messages or logs for clues.
Use debugging tools: Utilize tools like breakpoints and step-through debugging to inspect code execution.
Isolate the problem: Narrow down the code to the smallest section that causes the issue.
Review recent changes: Look at recent code changes that might...read more

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Q7. What is the process for identifying prime numbers?

Ans.

Identifying prime numbers involves checking if a number has only two distinct positive divisors: 1 and itself.

A prime number is greater than 1 and has no divisors other than 1 and itself.
To check if a number n is prime, test divisibility from 2 to √n.
For example, 7 is prime (divisors: 1, 7), while 8 is not (divisors: 1, 2, 4, 8).
Special cases: 2 is the only even prime number; all other even numbers are not prime.

Q8. footer in html,Anger tag Details and Css Syntax and types

Ans.

Footer in HTML is used to display information at the bottom of a webpage. Anchor tag is used to create hyperlinks. CSS syntax includes selectors, properties, and values.

Footer in HTML is created using the <footer> tag.
Anchor tag <a> is used to create hyperlinks in HTML.
CSS syntax includes selectors (e.g. class, id), properties (e.g. color, font-size), and values (e.g. red, 16px).