55 CETAS Information Technology Interview Questions and Answers

API

Ques:- What is the difference between GET, POST, PUT, and DELETE in HTTP

Asked In :- Xoriant Solutions Pvt Ltd, Object Frontier Software, KRIOS Info Solutions, Hidden Brains InfoTech, Shipco IT, Ziffity Solutions, Toxsl Technologies, Itobuz Technologies, Born Commerce, Infinity Labs LLP,

Right Answer:
GET is used to retrieve data from a server, POST is used to send data to a server to create a resource, PUT is used to update an existing resource on the server, and DELETE is used to remove a resource from the server.

API

Ques:- What is an API and how does it work

Asked In :- Ziffity Solutions, Toxsl Technologies, Itobuz Technologies, LiteBreeze Infotech, TRICON INFOTECH PVT, Spectra Medix India, Muvi Entertainment, Tredence Analytics Solutions, NSOFT SOLUTIONS, Spark Infosys,

Right Answer:
An API (Application Programming Interface) is a set of rules and protocols that allows different software applications to communicate with each other. It defines the methods and data formats that applications can use to request and exchange information. APIs work by sending requests from one application to another, which then processes the request and sends back a response.

API

Ques:- What is the difference between synchronous and asynchronous API calls

Asked In :- Vinove Software & Services Pvt Ltd, Winsoft Technologies India Pvt. Ltd, STIC SOFT E-SOLUTIONS, Toxsl Technologies, Solace Infotech, iROID Technologies, MatchMove India, CakeSoft Technologies, Razorpay-Startup, Fission Infotech,

Right Answer:
Synchronous API calls wait for the response before moving on to the next task, while asynchronous API calls allow the program to continue executing other tasks while waiting for the response.

API

Ques:- What is API authentication and what are common methods

Asked In :- Vinove Software & Services Pvt Ltd, Winsoft Technologies India Pvt. Ltd, DREAMORBIT SOFTECH PVT, Hidden Brains InfoTech, Netaxis IT Solutions (p), Queppelin Technology Solutions, Rock Solid Solutions, Shipco IT, Walkover Web Solutions, iROID Technologies,

Right Answer:
API authentication is the process of verifying the identity of a user or application trying to access an API. Common methods include:

1. **API Keys**: Unique keys provided to users to access the API.
2. **Basic Authentication**: Uses a username and password encoded in Base64.
3. **OAuth**: A token-based authentication method that allows users to grant limited access to their resources without sharing credentials.
4. **JWT (JSON Web Tokens)**: A compact, URL-safe means of representing claims to be transferred between two parties, often used for stateless authentication.
5. **HMAC (Hash-based Message Authentication Code)**: Uses a secret key to create a hash of the request, ensuring data integrity and authenticity.

API

Ques:- What are the common status codes in HTTP responses

Asked In :- DREAMORBIT SOFTECH PVT, Queppelin Technology Solutions, Addweb solutions, Solace Infotech, MatchMove India, QuickXpert Infotech, Recodem, Softcell Technologies, Codebox, scandid,

Right Answer:
The common status codes in HTTP responses are:

- **200**: OK
- **201**: Created
- **204**: No Content
- **400**: Bad Request
- **401**: Unauthorized
- **403**: Forbidden
- **404**: Not Found
- **500**: Internal Server Error
- **502**: Bad Gateway
- **503**: Service Unavailable

Data Analytics

Ques:- What is the difference between correlation and causation

Asked In :- Unyscape Infocom Pvt. Ltd., Vinove Software & Services Pvt Ltd, AnAr Solutions, STIC SOFT E-SOLUTIONS, Toxsl Technologies, Chegg India, Aranca (Mumbai), iROID Technologies, TNQ Technologies, MatchMove India,

Right Answer:
Correlation is a statistical measure that indicates the extent to which two variables fluctuate together, while causation implies that one variable directly affects or causes a change in another variable.

Data Analytics

Ques:- What is data analysis and why is it important

Asked In :- Unyscape Infocom Pvt. Ltd., WSNE Consulting, AnAr Solutions, Netaxis IT Solutions (p), Rock Solid Solutions, Ziffity Solutions, Chegg India, Aranca (Mumbai), Indocosmo Systems, Fortunesoft IT Innovations,

Right Answer:
Data analysis is the process of inspecting, cleaning, and modeling data to discover useful information, draw conclusions, and support decision-making. It is important because it helps organizations make informed decisions, identify trends, improve efficiency, and solve problems based on data-driven insights.

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 are the different types of data distributions

Asked In :- Medvarsity Online, Queppelin Technology Solutions, Shipco IT, Chegg India, Itobuz Technologies, Fortunesoft IT Innovations, RANDSTAD INDIA PVT, iROID Technologies, TRICON INFOTECH PVT, Razorpay-Startup,

Right Answer:
The different types of data distributions include:

1. Normal Distribution
2. Binomial Distribution
3. Poisson Distribution
4. Uniform Distribution
5. Exponential Distribution
6. Log-Normal Distribution
7. Geometric Distribution
8. Beta Distribution
9. Chi-Squared Distribution
10. Student's t-Distribution

Data Analytics

Ques:- What is data normalization and why is it important

Asked In :- KRIOS Info Solutions, WSNE Consulting, MattsenKumar Services, Shipco IT, Itobuz Technologies, Fortunesoft IT Innovations, Spadeworx Software Services, Namecheap Web Services, TNQ Technologies, Define Labs,

Right Answer:
Data normalization is the process of organizing data in a database to reduce redundancy and improve data integrity. It involves structuring the data into tables and defining relationships between them. Normalization is important because it helps eliminate duplicate data, ensures data consistency, and makes it easier to maintain and update the database.

Database Architect/ Designer Oracle

Ques:- Give the sequence of execution of the various report triggers?

Asked In :- Thrillophilia, CETAS Information Technology, smollan, datamark, inc., diona,

Database Analyst/ Programmer DB Architecture

Ques:- What is the relation between EME , GDE and Co-operating system ?

Asked In :- CETAS Information Technology, elv,

Aptitude Database Analyst/ Programmer

Ques:- 9 balls are there one of them is of higher wt and remaining all are of same. given is one weighing scale and you can use it two times. How will you find the heavy ball in two trials only.

Asked In :- CETAS Information Technology,

Right Answer:
1. Divide the 9 balls into three groups of 3 balls each: Group A, Group B, and Group C.
2. Weigh Group A against Group B.
- If one group is heavier, take the 3 balls from that group.
- If they balance, the heavy ball is in Group C.
3. From the group of 3 balls identified, weigh any 2 balls against each other.
- If one is heavier, that’s the heavy ball.
- If they balance, the remaining ball is the heavy one.

Comments

venkatesh Aug 12, 2021

Let us give name to each ball as B1, B2, B3, B4, B5, B6, B7, B8, B9.
Now divide all the balls into 3 groups.
Group1 - (B1, B2, B3), Group2 - (B4, B5, B6), Group3 - (B7, B8, B9)

STEP1 - We can weigh any two groups. Let's assume we choose Group1 on left side of the scale and Group2 on the right side.
when we weigh these two groups we can get 3 outcomes.

Weighing scale tilts on left - Group1 has a heavy ball.
Weighing scale tilts on right - Group2 has a heavy ball.
Weighing scale remains balanced - Group3 has a heavy ball.
Lets assume we got the outcome as 1. Then Group 1 has a heavy ball.

STEP 2 - Now weigh any two balls from Group1. Lets assume we keep B1 on left side of the scale and B2 on right side.
So now when we weigh these two balls we can get 3 outcomes.

Weighing scale tilts on left - B1 is the heavy ball.
Weighing scale tilts on right - B2 is the heavy ball.
Weighing scale remains balanced - B3 is the heavy ball.

(The same step applies if the group 2 or group3 has the heavy ball)

venkatesh Aug 12, 2021

Balls- B1, B2, B3, B4, B5, B6, B7, B8, B9.
Split into 3 groups.
Group1 - (B1, B2, B3), Group2 - (B4, B5, B6), Group3 - (B7, B8, B9)
Now weigh any two groups. Group1 on left side of the scale and Group2 on the right side.
When weighing scale (tilts left - Group1 has a heavy ball) or (tilts right - Group2 has a heavy ball) or (balanced - Group3 has a heavy ball)
Lets assume it tilts left then Group 1 has a heavy ball.
Now weigh any two balls from Group1. B1 on left side of the scale and B2 on right side.
When weighing scale (tilts left - B1 is the heavy ball) or (tilts right - B2 is the heavy ball) or (balanced - B3 is the heavy ball)

venkatesh Aug 12, 2021

Balls- B1, B2, B3, B4, B5, B6, B7, B8, B9.
Group1 – (B1, B2, B3), Group2 – (B4, B5, B6), Group3 – (B7, B8, B9)
Now weigh any two groups. Group1 on left side of the scale and Group2 on the right side.
When weighing scale tilts left – Group1 has a heavy ball or right – Group2 has a heavy ball or balanced – Group3 has a heavy ball.
Lets assume Group 1 has a heavy ball.
Now weigh any two balls from Group1. B1 on left side of the scale and B2 on right side.
When weighing scale tilts left – B1 is the heavy or tilts right – B2 is the heavy or balanced – B3 is the heavy.

DB Administration Project Leader/ Project Manager

Ques:- What is Group by in Select statement?

Asked In :- CETAS Information Technology, Bombinate Technologies, wibmo,

Database Architect/ Designer Shell Scripting

Ques:- What is the difference between a shell variable that is exported and the one that is not exported?

Asked In :- SOTI Inc, CETAS Information Technology, ona,

Right Answer:
An exported shell variable is available to child processes, while a non-exported variable is only accessible within the shell in which it was created.

JAVA Software Developer/ Programmer

Ques:- What is the difference between BytesMessage and StreamMessage??

Asked In :- CETAS Information Technology,

JAVA Team Lead/ Tech Lead

Ques:- What's new with the stop(), suspend() and resume() methods in JDK 1.2?

Asked In :- iauro systems, InvestCloud, CETAS Information Technology,

Core PHP CSS Photoshop Web Designer

Ques:- What is difference between HTML and html5

Asked In :- Infiniti Software Solutions, Art Technology and Software, ShopKeeper, Ideas2IT, OSI Digital, MagicPin, Multidots Solutions, Galaxy Weblinks, NovoInvent, Interview Mocha,

Right Answer:
HTML5 is the latest version of HTML, which includes new features like native support for audio and video, improved parsing rules, new elements (like `<article>`, `<section>`, `<nav>`, and `<header>`), and better support for web applications. HTML is the older standard that lacks these enhancements.

Sde

Ques:- Remove duplicated from a string in O(n) without using hash

Asked In :- Prudent Technologies, CETAS Information Technology,

Database Architect/ Designer JAVA

Ques:- What are the uses of Servlets?

Asked In :- CETAS Information Technology, integra connect,

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