65 Vvdn technologies Interview Questions and Answers

20 common asked question in every interview

Python Django

Ques:- what are all middleware you used and whats the purpose ot it?

Asked In :- rapidera technologies, Girmiti Software, Gainers Infotech, RTRT, NAB - National Australia Bank, PromptCloud, MindNerves Technologies, Valuefy Solutions, Able Design Engineering Services, infiniX (India),

Right Answer:
Some common middleware used in Django include:

1. **SecurityMiddleware**: Adds security-related headers to responses.
2. **SessionMiddleware**: Manages user sessions across requests.
3. **AuthenticationMiddleware**: Associates users with requests, enabling user authentication.
4. **MessageMiddleware**: Enables temporary message storage for user notifications.
5. **CommonMiddleware**: Provides various utilities, such as URL normalization and handling of empty GET/POST data.
6. **CsrfViewMiddleware**: Protects against Cross-Site Request Forgery attacks by adding CSRF tokens.

Each middleware serves a specific purpose in processing requests and responses in a Django application.

Python

Ques:- What is negative index in Python?

Asked In :- AQM Technologies, SimpleMinds Technologies LLP, GyanMatrix Technologies, Celebal, CDAC Thiruvananthapuram, Opencast Software, TAO Solutions, DePronto Infotech, Symphony Technologies, Winman Software India,

Python Django

Ques:- what are modules in django?

Asked In :- Valued Epistemics, Ideas2IT, Tyto Software, Mechlin Technologies, KareXpert Technologies, Elcamino Software, Conflux Technologies, Graviton Technologies, pure storage, vvdn technologies,

Right Answer:
In Django, modules are Python files that contain reusable code, which can include functions, classes, and variables. They help organize the application into manageable components, such as models, views, and templates, allowing for better structure and maintainability of the project.

Python

Ques:- What is a docstring?

Asked In :- toobler technologies, Rightpoint India Digital, Tagit Pte, ION Group, AMI Tech India, Accelya, FACEIT, Mathematica, Snapsheet, Stellantis,

Python

Ques:- Explain the role of repr function.

Asked In :- Shipmnts, DecisionTree Analytics and Services, NJ Technologies, Yalamanchili Software, NAB - National Australia Bank, ProtoTech Solutions, TAO Solutions, Chain-sys India, AXA XL, medidata solutions,

Comments

Admin May 17, 2020

Python can convert any value to a string by making use of two functions repr() or str().
The str() function returns representations of values which are human-readable, while repr() generates representations which can be read by the interpreter.
repr() returns a machine-readable representation of values, suitable for an exec command.
Following code sniipets shows working of repr() & str() :

Database Administrator (dba) SQL Server

Ques:- How to replace double quotes by single quotes in sql server

Asked In :- Atidan Technologies, Hexaview Technologies private, Thirdware, DSM SOFT, Cron-J, Relinns Technologies, Prutech Solutions, eBay Classifieds, Spire Global, Nice Solutions,

Database Architect/ Designer SQL Server

Ques:- What is the use of database index (apart from fast searching of records);What is use of composite key ?

Asked In :- Coviam Technologies, CTRLS DATACENTERS, i-exceed technology solutions, ANR Software, Sarjen Systems, RORO, Neustar, Datagrokr, Baryons Software Solutions, Department for Transport,

Right Answer:
A database index improves the performance of queries by allowing faster access to rows, reduces the amount of data that needs to be scanned, and can enforce uniqueness. A composite key is used to uniquely identify a record using two or more columns, which helps maintain data integrity and allows for more complex relationships between tables.

Database Architect/ Designer SQL Server

Ques:- How to find out duplicate records in sql server.

Asked In :- Solace Infotech, Sardonyx Technologies, SysTrack Solution, Angular Minds, Yudiz Solutions, Apttus Software, CTRLS DATACENTERS, Softeon India, Dassault Systemes, IDS Infotech,

sql

Ques:- You are shrunk to the height of a 2p coin and thrown into a blender. Your mass is reduced so that your density is the same as usual. The blades start moving in 60 seconds. What do you do?

Asked In :- Artech Infosystems, Sanmina Corporation, SimpleMinds Technologies LLP, Zen Corp Techno Solutions, District Cooperative Central Bank DCCB, Smart Serve Infotech, TechMojo Solutions, New Wave Computing, Dhruv Compusoft Consultancy, SADA,

Database Architect/ Designer SQL Server

Ques:- How to create a database link?

Asked In :- Grid Logic Software, POPCORNAPPS SOFTWARE PVT, Citrus Informatics (India), ProV Infotech Systems, Diya Systems (Mangalore), Dhyan Infotech, Hestabit Technologies, DataMetica, redBus India, Capital Numbers,

Right Answer:
To create a database link in SQL Server, you can use a linked server. Here’s the SQL command:

```sql
EXEC sp_addlinkedserver
@server='LinkedServerName',
@srvproduct='',
@provider='SQLNCLI',
@datasrc='RemoteServerName';
```

Replace `LinkedServerName` with your desired name for the link and `RemoteServerName` with the name of the remote server you want to connect to.

Data Analytics

Ques:- What is the difference between supervised and unsupervised learning

Asked In :- Medvarsity Online, KRIOS Info Solutions, AnAr Solutions, Netaxis IT Solutions (p), MattsenKumar Services, Shipco IT, Chegg India, Indocosmo Systems, Born Commerce, Cybage Software,

Right Answer:
Supervised learning uses labeled data to train models, meaning the output is known, while unsupervised learning uses unlabeled data, where the model tries to find patterns or groupings without predefined outcomes.

Data Analytics

Ques:- What is a hypothesis and how do you test it

Asked In :- Vinove Software & Services Pvt Ltd, Medvarsity Online, Trigent Software, RANDSTAD INDIA PVT, Spadeworx Software Services, Dhruvsoft Services, TNQ Technologies, Clear Trail Technologies, Cloud Kinetics Technology Solutions, Startup - Navya Network,

Right Answer:
A hypothesis is a specific, testable prediction about the relationship between two or more variables. To test a hypothesis, you can use the following steps:

1. **Formulate the Hypothesis**: Clearly define the null hypothesis (no effect or relationship) and the alternative hypothesis (there is an effect or relationship).
2. **Collect Data**: Gather relevant data through experiments, surveys, or observational studies.
3. **Analyze Data**: Use statistical methods to analyze the data and determine if there is enough evidence to reject the null hypothesis.
4. **Draw Conclusions**: Based on the analysis, conclude whether the hypothesis is supported or not, and report the findings.

Data Analytics

Ques:- What is regression analysis and when is it used

Asked In :- Xoriant Solutions Pvt Ltd, Hidden Brains InfoTech, STIC SOFT E-SOLUTIONS, Fortunesoft IT Innovations, iROID Technologies, Dhruvsoft Services, Clear Trail Technologies, MatchMove India, Radicle Software, Spectra Medix India,

Right Answer:
Regression analysis is a statistical method used to examine the relationship between one dependent variable and one or more independent variables. It is used to predict outcomes, identify trends, and understand the strength of relationships in data.

Data Analytics

Ques:- What is clustering in data analysis and how is it different from classification

Asked In :- Medvarsity Online, AnAr Solutions, MattsenKumar Services, Protege Solutions, Shipco IT, Chegg India, Fortunesoft IT Innovations, GOQii Technologies, Spadeworx Software Services, Dhruvsoft Services,

Right Answer:
Clustering in data analysis is the process of grouping similar data points together based on their characteristics, without prior labels. It is an unsupervised learning technique. In contrast, classification involves assigning predefined labels to data points based on their features, using a supervised learning approach.

Data Analytics

Ques:- What are descriptive and inferential statistics

Asked In :- Vinove Software & Services Pvt Ltd, KRIOS Info Solutions, Shipco IT, STIC SOFT E-SOLUTIONS, Toxsl Technologies, GOQii Technologies, Namecheap Web Services, iROID Technologies, TRICON INFOTECH PVT, SWYM,

Right Answer:
Descriptive statistics summarize and describe the main features of a dataset, using measures like mean, median, mode, and standard deviation. Inferential statistics use sample data to make predictions or inferences about a larger population, often employing techniques like hypothesis testing and confidence intervals.

Mobile App Development

Ques:- How do you publish an app on Google Play Store and Apple App Store

Asked In :- Object Frontier Software, Define Labs, SPARX IT SOLUTIONS, RAKUTEN INDIA ENTERPRISE PVT, Muvi Entertainment, Spark Infosys, CodeClouds IT Solutions, Deligence Technologies, infobell IT solutions, Pinnacleworks Infotech,

Right Answer:
To publish an app on the Google Play Store, you need to:

1. Create a Google Play Developer account.
2. Prepare your app (APK or AAB file) and ensure it meets the Play Store guidelines.
3. Fill out the app listing details (title, description, screenshots, etc.).
4. Upload the app file and set the pricing and distribution options.
5. Submit the app for review.

To publish an app on the Apple App Store, you need to:

1. Enroll in the Apple Developer Program.
2. Prepare your app (IPA file) and ensure it meets the App Store guidelines.
3. Use Xcode to archive your app and upload it to App Store Connect.
4. Fill out the app listing details (title, description, screenshots, etc.) in App Store Connect.
5. Submit the app for review.

Mobile App Development

Ques:- What are lifecycle methods in mobile app development

Asked In :- iROID Technologies, Define Labs, Muvi Entertainment, CodeClouds IT Solutions, Infostretch solutions, Grapelime Infotech, Coviam Technologies, PowerSchool, Mobio Solutions, WebReinvent Technologies,

Right Answer:
Lifecycle methods in mobile app development are functions that manage the states of an application as it runs. They include methods for when the app is created, started, resumed, paused, stopped, and destroyed. These methods help developers control the app's behavior during transitions between these states, ensuring proper resource management and user experience.

Mobile App Development

Ques:- What is mobile app development and why is it important

Asked In :- Vinove Software & Services Pvt Ltd, Toxsl Technologies, Codiant Software Technologies, Startup - Navya Network, SPARX IT SOLUTIONS, SWYM, TVISHA TECHNOLOGIES PVT, CaratLane, Coviam Technologies, BillDesk,

Right Answer:
Mobile app development is the process of creating software applications specifically designed to run on mobile devices like smartphones and tablets. It is important because it allows businesses to reach customers directly, enhances user engagement, provides convenience, and enables access to services and information on-the-go.

Mobile App Development

Ques:- What are some popular mobile development frameworks

Asked In :- Object Frontier Software, Fortunesoft IT Innovations, iROID Technologies, LenDenClub, TVISHA TECHNOLOGIES PVT, Infostretch solutions, scandid, Coviam Technologies, PowerSchool, Aruba Networks,

Right Answer:
Some popular mobile development frameworks are:

1. React Native
2. Flutter
3. Xamarin
4. Ionic
5. Apache Cordova
6. NativeScript

Mobile App Development

Ques:- What is the difference between Android and iOS development

Asked In :- Vinove Software & Services Pvt Ltd, Toxsl Technologies, Startup - Navya Network, LenDenClub, Spark Infosys, CodeClouds IT Solutions, mobifly, 9series Solutions, Uolo Technology, Appscrip,

Right Answer:
The main differences between Android and iOS development are:

1. **Programming Languages**: Android uses Java or Kotlin, while iOS uses Swift or Objective-C.
2. **Development Environment**: Android development is done using Android Studio, whereas iOS development uses Xcode.
3. **User Interface Design**: Android follows Material Design guidelines, while iOS follows Human Interface Guidelines.
4. **App Distribution**: Android apps are distributed through Google Play Store, while iOS apps are distributed through the Apple App Store.
5. **Device Fragmentation**: Android runs on a wide range of devices with varying screen sizes and hardware, while iOS is limited to Apple devices, ensuring more uniformity.

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VVDN Technologies is a leading product engineering and manufacturing company, renowned for its innovative solutions across various industries, including automotive, consumer electronics, networking, and telecommunications. With a focus on cutting-edge technology, quality, and customer satisfaction, VVDN offers end-to-end services, from product conceptualization and design to manufacturing and after-sales support. At VVDN Technologies, we pride ourselves on our ability to deliver world-class solutions that meet the evolving needs of our clients. Our team of skilled engineers and developers work tirelessly to design and develop cutting-edge products and solutions that help our clients stay ahead of the competition and achieve their business objectives. One of the key strengths of VVDN Technologies lies in our state-of-the-art manufacturing facilities and rigorous quality control processes. We adhere to the highest standards of quality and reliability, ensuring that every product that leaves our facilities meets the strictest quality standards.

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