Technology Interview Questions and Answers

Last updated on Feb 06, 2023
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Technology Interview Questions

We bring you a collection of the essential technology interview questions. This is best suited for college freshers and inexperienced professionals just getting into the field of technology. If you're fresher hunting for a job in the Technology Domain, you have landed on the right page!

Our list consists of the most frequently asked technology interview questions and answers, from various domains like C, C++, Java, Data Structures & Algorithms. These are the very core topics of the technology domain, which can help a fresher get an edge over others competing for the same job position. We aim to drive clarity within you by helping you understand the most critical programming world concepts, regardless of the tech stack you choose to pursue.

Most Frequently Asked Information technology interview questions

Here in this article, we will be listing frequently asked Technology Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q1. What is the difference between a JDK and a JVM?
Stands for Java Development Kit. Stands for Java Virtual Machine.
This is a software development kit used for developing applications in Java. It is used for executing Java Byte code while also providing an environment for its execution.
This is platform dependent. This is platform-independent.
It contains tools relevant for the development, debugging, and monitoring of Java Code. This does not include any tools.
This is a superset of JRE. This is a subset of JRE.
This helps developers to develop applications that can be executed by the JVM and the JRE. This is the component used for executing the source code.
Q2. What is the difference between a string and an array?
Array String
This is a sequential collection of elements having the same data type. This is a sequence of characters presented as a single data type.
Elements of the array are stored in a continuous manner to optimize memory locations space. Strings can be stored in any manner.
It can store floats, integers, doubles, etc. Strings can only hold char data types.
Arrays are mutable, i.e., values can be changed later on. Strings are immutable, i.e., values cannot be changed once created.
It can be one or two dimensional. It is only two dimensional.
The length of an array once created is fixed. The length of a string can be changed later on.
Q3. Is a default case necessary in a switch statement?
No, it is not vital that you have a default case in a switch statement. Although, if no case in your switch is satisfied, the default case can be useful. So, if you're unsure about the outcome, it's advised that you mention a default case.
Q4. What is the difference between method overriding and overloading?
Method Overloading Method Overriding
In this case, all the parameters must be changed. In this case, all the parameters must be the same.
This occurs within a class. This occurs between two classes having an inheritance relationship.
Q5. What is the difference between white box, black box, and gray box testing?
Black Box Testing White Box Testing Grey Box Testing
This is also known as functional testing, data-driven testing, and closed-box testing. Also known as structural testing, precise box testing, code-based testing, and transparent testing. Also known as translucent testing.
It is not suited for algorithm testing. It is perfectly suitable and recommended for algorithm testing. Not considered for algorithm testing.
This kind of testing is based on a trial and error system as the tester does not have coding knowledge. This type of testing takes an approach of verifying the system boundaries and data domains inherent in the software. If the tester has enough knowledge of coding, the way forward is validation data domains and internal system boundaries of the software.
The testing space of tables for inputs is the largest among all the other testing processes. The testing space of tables for inputs is less as compared to Black Box testing. The testing space of tables for inputs is the least.
In this, the user, tester, and developer can be a part of the testing process. In this, only the tester and developer can be a part of the testing process. In this, the user, tester, and developer are part of the testing process.
Here, the basis of testing is the external behavior of the software. Here the basis of testing is purely internal behavior of the software. Here the testing is based on high-level databases and data flow diagrams.
Q6. What is the difference between verification and validation?

Here is the technical difference between verification and validation:

This comprises checking the documents, codes, designs, and programs. This comprises the testing and checking of the actual product.
This is basically static testing. This is dynamic testing.
This does not include the process of executing codes. This does include the process of executing codes.
It contains various types, such as reviews, walkthroughs, desk-checking, and inspections. It includes three types of processes, namely, non-functional testing, Black Box Testing, and White Box Testing.
This process examines whether a software conforms to specifications or not. This process examines whether the software meets the expectations and requirements of a user.
It is used to find bugs in the early stage of inspection in any software. Used to find out bugs not found by the process of verification.

Note: The name Google was created accidentally due to spelling. The founders were actually going for the name Googol! Here's our complete list of information technology interview questions to help you get a job in the technology sector.

Q7. What are local variables?

A local variable is a kind of variable that is effective only within the function it is defined. When the function has finished its course of execution, the local variables no longer exist.

Q8. What is the % operator?

This is the modulus operator, and it gives the remainder after the division of two integers.


var A= 4
var B= 2

A%B = 0

Q9. How is final different from finally and finalize()?
Final Finally() Finalize()
This is technically a keyword. This is technically a block. This is technically a protected method.
Its usage is applying restrictions on class, variable, and methods. This is used for both exception handling, try and catch blocks. This is only called by the garbage collector before an object is being removed.
Q10. What is the difference between a break statement and a continue statement?
Break Statement Continue Statement
This is used for breaking a loop or iteration. This is used for continuing a loop or iteration.
Reviewed and verified by Umesh Singh
Umesh Singh

My name is Umesh Singh having 11+ experience in Node.JS, React JS, Angular JS, Next JS, PHP, Laravel, WordPress, MySQL, Oracle, JavaScript, HTML and CSS etc. I have worked on around 30+ projects. I lo...