HTML/CSS, JavaScript, C#, and SQL Online Test
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The HTML/CSS, JavaScript, C#, and SQL online test assesses candidates' knowledge across the whole Web stack from HTML, CSS, and JavaScript on the Web front-end over C# on the back-end to SQL for data access.
It's an ideal test for pre-employment screening. A good full stack developer C# needs to be able to use a wide range of technologies.
This online test requires candidates to solve coding problems and find and fix bugs in multiple technologies.
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Free Sample Questions for HTML/CSS, JavaScript, C#, and SQL Test
Our sample questions are free for companies to use on a trial plan. See more about our premium questions for paid plans below.
Avatar
7min
-
Easy
Easy
-
CODE
HTML/CSS
Borders
Element size
Styling
Public
HTML/CSS
HTML is the standard markup language for creating web pages. It's an essential skill for anyone creating web pages of any complexity.
Borders
Borders can be applied to most HTML elements within the body. This is one of the most used element decorations.
Element size
Setting the size of the elements on a web page is one of the basic things that any web developer or designer should know.
Styling
Styling user interfaces according to the specification is a daily routine for a front-end developer.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
Every user on your website has an image avatar that is displayed when they post a comment. You want to style these images differently from other images on your site. Add a CSS class named avatar that fulfils the following requirements:
- The avatar's border is rounded, so that it appears as a circle.
- The avatar's width and height are both 150px.
- The avatar has a solid border, has a width of 2px, and be colored gray.
For example, the avatar in the template should look like:
Alert Service
10min
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Easy
Easy
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CODE
C#
Interfaces
Inversion of control
Refactoring
Public
C#
The C# programming language is a simple, modern, general-purpose, object-oriented programming language. Having a basic familiarity with the programming language used on the job is a prerequisite for quickly getting up to speed.
Interfaces
An interface is used to define an abstract type that defines behaviors as method signatures. Instances of different types can implement the same interface and provide a way for a developer to reuse the code.
Inversion of control
Inversion of Control (IoC) is a pattern that is used to invert different kinds of controls in object-oriented design to achieve loose coupling. Developers should know how to use it in order to increase modularity of the program and make it extensible.
Refactoring
The process of restructuring existing computer code without changing its external behavior. It is essential for keeping code readable and maintainable.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
Refactor the AlertService and AlertDAO classes:
- Create a new interface, named IAlertDAO, that contains the same methods as AlertDAO.
- AlertDAO should implement the IAlertDAO interface.
- AlertService should have a constructor that accepts IAlertDAO.
- The RaiseAlert and GetAlertTime methods should use the object passed through the constructor.
Students
3min
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Easy
Easy
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CODE
SQL
Aggregation
Select
Public
SQL
SQL is the dominant technology for accessing application data. It is increasingly becoming a performance bottleneck when it comes to scalability. Given its dominance, SQL is a crucial skill for all engineers.
Aggregation
An aggregate function is typically used in database queries to group together multiple rows to form a single value of meaningful data. A good programmer should be skilled at using data aggregation functions when interacting with databases.
Select
The SELECT statement is used to select data from a database. It is the most used SQL command.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
Given the following data definition, write a query that returns the number of students whose first name is John. String comparisons should be case sensitive.
TABLE students id INTEGER PRIMARY KEY, firstName VARCHAR(30) NOT NULL, lastName VARCHAR(30) NOT NULL
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Premium Questions for HTML/CSS, JavaScript, C#, and SQL Test
TestDome offers a premium questions library with 1000+ unique, hand-crafted questions whose answers can’t be found online. If you spot an answer somewhere online, we’ll give you a refund.
Question Names
These premium questions are included in this pre-built test and can be added to any multi-skill test. Please sign up for a paid plan to view the questions in detail.
Filter, Driver Exam, Positive Numbers, Links, Double, Read First Line, Truthy Expressions, Roads, Document Store, New Folder, Max Sum, Log Patch, Log Patch, Shipping, Loading Bar, Read Write Execute, Procedural Generator, Segment, Segment, Hobbies, A Tag, Ad, Article Style, ATM Locations, Authors, Autocomplete, Baby Names, Ban Users, Bank Branches, Bookmark, Chain Link, Cheapest Product, Christmas Tree, Cities, Classroom, Confirm, Countries, Developers, Disposable Wrapper, Document Counter, Editor, Employee Manager, Veterinarian, Eye of the Storm, Format Table, Hide Button, Hobbies, Hospital Patients, Index Performance, Menu Items, Merge Stock Index, Movies, Movies Live, Projects, Rectangles, Restaurant Menu, Retirees, Sales, SMS Messages, Tasks, Youngest Child, Keywords, Label Color, Loading, Logo, Node, Paragraph, Paragraph, Platformer, Product Refactoring, Products, Remove Repetitions, Row Appender, Scale Font Size, Shirts, Snapshot, Snapshot, Sort Params, Timesheet, Unique Numbers, Upload, Username, Username, Vectors, Vectors, Warehouse, Weighted Average, Widgets, Window Manager, Language Teacher, Delete Orders, Timer, Book Sale, Friend, Screen, Email Tables, Average Salary, Auto Show, Poll, Shelf Test, Array Search, Department Report, iframe, Post Comment, Cards, Validation, Table of Names, Blog, Stories, Prefix, Student Rankings, Student Max Score, Adder, Data Entry, Moving Total, Screen Reader, Shining Star, TestDome Logo, Car Rental, Paper Strip, Max Sum, Reorder, Ingredients, Crop Ratio, Launch Time, Bicycle, Product Rating, Function Wrapper, Link, Users and Accounts, Matching Clothes, Agents, River Discharge, Nullable Employee, Patient Class, Kilometer Converter, Stack to List, Internal Nodes, Fire Dragon, Log Parser, Log Parser, Ingredient Tuple, Animal Hierarchy, Height, Unique Numbers, Share Button, Chinese Box, Manager Sales, Load URL, Photon Frequency, String Occurrence, Price List, Ice Cream Flavors, Addition, Movie Genres, Student Activities, Worker, Welfare Organization, Date Transform, Date Transform, Transactions, Racer, Trading Data Paging, Unique Product, Unique Product, Color Codes, Memory Game, Flight Connections, Tax Calculator, Special Actions, XML NavigationCovered Skills
Testing of these skills is covered in this pre-built test because they’re closely related. On our paid plan, you can easily create your own custom multi-skill tests.
JavaScriptJavaScript
JavaScript is the programming language of HTML and the web. It's an essential skill for any programmer working with websites and web technologies.
Arrays
An array is a container of a fixed number of objects of a similar type. It is a fundamental component of most programming languages.
C#
The C# programming language is a simple, modern, general-purpose, object-oriented programming language. Having a basic familiarity with the programming language used on the job is a prerequisite for quickly getting up to speed.
Exceptions
Exceptions exist in most modern programming languages, making it important for a programmer to understand them and know how to handle them.
Closures
Closures are an important concept in any programming language in which functions are first-class citizens.
HTML/CSS
HTML is the standard markup language for creating web pages. It's an essential skill for anyone creating web pages of any complexity.
CSS selectors
Selectors are a programming pattern that can be used to select an element from a container. They are primarily used in technologies such as CSS and jQuery to apply styles to groups of elements.
Styling
Styling user interfaces according to the specification is a daily routine for a front-end developer.
DOM manipulation
Dynamically accessing and updating user interface elements is an important part of most modern web applications.
Event handling
Event-based design patterns are very common in modern applications, especially in the development of user interfaces.
Language
A programmer should use a language as a tool, always taking advantage of language-specific data types and built-in functions.
SQL
SQL is the dominant technology for accessing application data. It is increasingly becoming a performance bottleneck when it comes to scalability. Given its dominance, SQL is a crucial skill for all engineers.
Conditions
Conditional statements are a feature of most programming and query languages. They allow the programmer to control what computations are carried out based on a Boolean condition.
Views
A database view is a result set that is defined by a stored query, the results of which can can also be queried. As a fundamental and widely used database construct, it's useful for candidates to understand how and when they should be used.
Bug fixing
Everyone makes mistakes. A good programmer should be able to find and fix a bug in their or someone else's code.
Strings
The string data structure is used to represent text. It is one of the most commonly used data structures. Therefore, every programmer should be skilled at string manipulation.
Algorithmic thinking
When designing and/or analyzing an algorithm or data structure, it is important to consider the performance and structure of an implementation. Algorithmic thinking is one of the key traits of a good programmer, especially one working on complex or performance-critical code.
Monkey patching
Monkey Patching is a method of either adding new or overriding existing functionality without the creation of a new type. As such it's an important tool for developers to be familiar with.
Extension methods
Extension methods enable are method of extending existing types without extending the type, recompiling or modifying the original type. They are a useful feature of developers who want to write and maintain clean and concise code.
Arithmetic
Arithmetic is a fundamental branch of mathematics. An understanding of arithmetic concepts, and their application, is important for every candidate.
HTML5
HTML5 is now supported in all modern browsers, making it important for front-end developers to know how to use its features.
Random
Random number generators are used to generate random numbers and/or symbols. There are a wide variety of random number generators each with very specific use cases, as such it's important for all developers to know and understand when to use each type.
Iteration
Iteration is the act of repeating a process, or cycling through a collection. Iteration is one of the fundamental flow control tools available to developers.
Attribute manipulation
Getting and setting HTML attributes is one of the most common coding tasks of that changes something on a web page.
Element spacing
Setting the margins and padding of the elements on a web page is one of the basic things that any web developer or designer should know.
Constraints
Constraints are used to define rules and relationships. They are applied to a dataset. A constraint may take many forms, such as x ≤ 5 in a programming language and a NOT NULL constraint in a SQL table definition.
Create table
The CREATE TABLE statement is used to create a new table in a database. It is an essential command when creating new database.
Database schema
A database schema defines how data is stored in a database. An SQL database uses a schema to define tables consisting of rows and columns that use fixed data types to store data. Formalizing how data is stored is the first step towards building an application or service.
Select
The SELECT statement is used to select data from a database. It is the most used SQL command.
Create index
The CREATE INDEX statement is used to create indexes for tables. Indexes are used to retrieve data from the database more quickly. They are very important for making performant queries.
Performance tuning
The performance of an application or system is important. The responsiveness and scalability of an application are all related to how performant an application is. Each algorithm and query can have a large positive or negative effect on the whole system.
Flexbox
The Flexible Box Layout Module makes it easier to design a flexible responsive layout structure.
Positioning
Dynamic positioning of user interface elements depending on resolution is more important than ever in modern applications, making this important for a front-end developer.
Alter table
The ALTER TABLE statement is used to add, delete, or modify columns and constraints in an existing table. Alter table statements are important for all programmers who have to modify existing schemas.
Bookmarks
A bookmark is a hyperlink that points to a location within a document, which is defined by a name that is assigned to an element. Bookmarks are used when we need to jump to a specific location within a document.
Elements and attributes
Defining elements and their attributes is the first process in creating an HTML page.
Linked list
A linked list is a linear collection of data elements where each element points to the next. It is a data structure consisting of a collection of nodes which together represent a sequence. It is usually used for advanced scenarios where we need fast access to the next element, or when we need to remove an element from anywhere in the collection.
Aggregation
An aggregate function is typically used in database queries to group together multiple rows to form a single value of meaningful data. A good programmer should be skilled at using data aggregation functions when interacting with databases.
Subqueries
Subqueries are commonly used in database interactions, making it important for a programmer to be skilled at writing them.
Fonts
Setting the font name or size is part of creating any web page.
Accessibility levels
Access modifiers like public, protected, or private should be used to specify accessibility levels - who can access the object or some of its parts. They are one of the key points for writing maintainable object-oriented code.
Properties
A property is a member of a class that provides a flexible mechanism for classes to expose private fields. It is a topic that should be well known to any developer who works with an OOP language that supports it.
Dialog box
Dialog box, a small window that pops-up, is a common way for communicating information to the user and prompting them for a response.
Ordering
Knowing how to order data is a common task for every programmer.
Destructors
A destructor is a special member function that is called when the lifetime of an object ends. Developers should use them to free (unmanaged) resources that the object may have acquired during its lifetime.
Memory management
Memory management allows programs to request memory dynamically from the operating system, and free it for reuse when no longer needed. Many modern programming languages automate this process; however, it should still be an important consideration when implementing an application.
OOP
Object-oriented programming is a paradigm based on encapsulating logic and data into objects, which may then contain fields and procedures. Many of the most widely used programming languages are based on OOP, making it a very important concept in modern programming.
Refactoring
The process of restructuring existing computer code without changing its external behavior. It is essential for keeping code readable and maintainable.
Left join
LEFT JOIN is one of the ways to merge rows from two tables. We use it when we also want to show rows that exist in one table, but don't exist in the other table.
Queue
A queue is a collection of items that are maintained in a sequence and can be modified by the addition of entities at one end of the sequence and removal from the other end of the sequence. It is the collection to be used when first-in-first-out (FIFO) collection is needed.
Asynchronous calls
Calling methods asynchronously is a common task for programmers.
Dictionary
A dictionary (or associative array) is a data type composed of a collection of key-value pairs, where each possible key appears at most once in the collection. It is used when we need to access items by their keys.
Lists
Lists are collections that act as dynamic arrays. Lists offer the flexibility of dynamically sized arrays, the simplicity of access of arrays, and are more performant than more ubiquitous collections in most scenarios.
Indexes
The proper implementation and use of indexes are important for improving the performance of database queries.
Union
The UNION operator is used to combine the result-set of two or more SELECT statements. It is often used when a report needs to be made based on multiple tables.
Group by
The GROUP BY statement groups rows by some attribute into summary rows. It is a common command when making various reports.
Update
The UPDATE statement is used to modify the existing records in a table and is one of the most used operations for working with the database.
Insert
Even though most database insert queries are simple, a good programmer should know how to handle more complicated situations like batch inserts.
Joins
A normalized database is normally made up of multiple tables. Joins are, therefore, required to query across multiple tables.
Animation
Animation is the process in which images or objects are manipulated to appear as if they are moving. It's a powerful effect that is important for UI designers to understand and be able to use.
Recursion
A good programmer should be familiar with when to use recursive functions, since they can provide elegant solutions for complex problems.
Tree
A tree is a hierarchical structure defined recursively starting with the root node, where each node is a data structure consisting of a value, together with a list of references to other nodes (the "children"). A lot of problems can be solved efficiently with trees, which makes them important for developers.
Regex
A regular expression (regex) is a special text string for describing a search pattern. It is a common way for extracting data from text.
Data structures
Choosing the right data structure to solve a problem can have huge implications on the performance of an application. Knowing when to use a specific data structure is one of the most important skills for a programmer.
JSON
JSON is an open-standard format that uses human-readable text to transmit data objects consisting of attribute-value pairs. It's the most common data format used for asynchronous browser/server communication.
Serialization
Familiarity with data serialization to and from formats such as XML and JSON is important as it is commonly used for interprocess communication
Sorting
Every programmer should be familiar with data-sorting methods, as sorting is very common in data-analysis processes.
StringBuilder
Since a string is an immutable data structure, concatenating multiple strings can introduce significant performance penalties. Every experienced developer should know when to use StringBuilder instead of simply concatenating two strings to improve performances in such scenarios.
Content manipulation
Adding or modifying content is the most common task when developing dynamic web pages.
Forms
Forms provide a method of grouping inputs and collecting user data. As such, they are important for all front end developers.
Objects
An object is a self-contained component which consists of methods and properties to make a particular type of data useful. Knowing how to create objects, and work with them, is an essential part of OOP.
Pass by reference
The call by reference method of passing arguments to a function copies the reference of an argument into the formal parameter. Inside the function, the reference is used to access the actual argument used in the call. This means that changes made to the parameter affect the passed argument. This is one of two possible ways for passing an argument to a function so it should be known to any developer.
Tables
A table stores data as rows and columns. From databases to HTML layouts, as a data structure they are ubiquitous. They are an important structure for developers to understand and know how to use.
Inheritance
In object-oriented programming, inheritance is the mechanism of basing a class upon another class, retaining similar implementation. Inheritance allows programmers to reuse code and is a must know topic for every programmer who works with OOP languages.
Delete
The delete statement is used to delete records in a table and is one of the four basic CRUD functions (create, read, update, and delete) required for working with any persistent storage.
Callback
A callback is a piece of code that can be passed as an argument to another bit of code. It's a very common pattern that has a wide variety of uses, and as such it's important to understand.
Graphs
Many real-life situations are best modeled by graphs. Therefore, an in-depth knowledge of graph data structures is important for a good programmer.
Classes
A class is one of the most widely used and primary structures used in object-oriented programming. As such it's important for any developer to have a working knowledge of how to use it.
ECMAScript 2015
ECMAScript 2015 adds a significant number of features to JavaScript, including classes, modules and range based loops. As such it's important for any JavaScript developer to understand.
Borders
Borders can be applied to most HTML elements within the body. This is one of the most used element decorations.
Inline styles
Inline styles are styles that are applied directly on elements. This is one of the ways for applying styles and for some scenarios, such as for email, is the only supported way.
SQL CASE
The CASE statement is SQL's control statement. It goes through conditions and returns a value.
Test case design
Being able to create a set of test cases that ensure adequate test coverage is a key skill for creating a successful test. It is desirable for the test suite also to be optimal, i.e. to minimize test execution effort and time without affecting the test coverage.
Unit testing
Unit testing is a type of software testing where individual units or components of a software are tested. Unit testing of software applications is done during the development (coding) of an application and should be well known practice to any developer.
Hyperlink
Hyperlink, or simply a link, is a reference to data that the reader can follow by clicking or tapping. There's no web page without a hyperlink.
IFrame
The HTML Inline Frame element (iframe) represents a nested browsing context, embedding another HTML page into the current one. Web developers often use it to display content within other content.
Semantic tags
HTML5 introduced semantic tags, which can greatly improve the level of automated analysis that can be done on documents, as well as improve the readability of HTML.
Dynamic programming
Dynamic programming methods for code optimization can be very useful to a programmer who understands them.
LINQ
LINQ provides a compile functional interface for querying datasets. A good .NET developer should be able to take full advantage of this.
Multithreading
Multi-threading allows a process to make more efficient use of modern hardware by allowing code to execute asynchronously. It can drastically improve the performance of any app; however, it can be tricky to get right, making this an important topic for any programmer.
Synchronization
When using multithreading, developers need to know how to make one thread wait for another to finish its task before continuing with its work.
HashSet
HashSet is container that stores unique elements in no particular order. This allows for fast checks to see if a value was already added.
Accessibility
Accessibility refers to the design of products, devices, services, or environments for people who experience disabilities. It's important for all designers and developers to know how to optimize for people who experience disabilities.
TDD
Test-driven development (TDD) is a software development process that relies on the repetition of a very short development cycle: requirements are turned into very specific test cases, based on which the software is improved only in order to pass the new tests. TDD is an essential skill for modern programmers.
CSS layout
Cascading Style Sheets are the styling language of the web. For a front-end developer, a knowledge of CSS layouts is required.
Integer division
Integer division is division in which the fractional part (remainder) is discarded. Knowing this is important for optimal implementation of some algorithms and for avoiding common bugs.
Timing Events
JavaScript can be executed in time-intervals. JavaScript developers use timing events to delay the execution of certain code, or to repeat code at a specific interval. Knowledge of timing events is necessary to implement features that have time as a factor.
Field modifiers
Field modifiers should be used to specify additional properties of fields like their mutability, are they defined on an instance or are they static, etc.
Right join
RIGHT JOIN is one of the ways to merge rows from two tables. We use it when we also want to show rows that exist in one table, but don't exist in the other table.
Database normalization
Database normalization is the process of structuring a relational database in accordance with a series of so-called normal forms in order to reduce data redundancy and improve data integrity. It should be used to avoid undesirable side-effects such as update, insert, and delete anomalies.
Null coalescing operator
The null coalescing operator takes two values and returns a non-null value. It is often used to simplify conditionals that check if a variable is null.
Null conditional operator
The null conditional operator is a binary operator that returns null if its first argument is null; otherwise it performs a dereferencing operation as specified by the second argument. It's often used to simplify executing code if a variable is null.
Abstract class
An abstract class can include abstract methods and can be subclassed, but it cannot be instantiated. They are often used as building blocks of application.
Method overriding
Method overriding, in object-oriented programming, is a language feature that allows a subclass to provide a specific implementation of a method that is already provided by one of its parent classes.
Complexity
A good programmer should be able to analyze and plan for the performance of an algorithm.
Stack
A stack is dynamic data container that follows the Last In First Out (LIFO) principle. Developers should use stack when the last item to be inserted into a container is the first one to be deleted from it.
Higher order function
A higher order function is a function that takes another function as an argument, or returns another function. Developers often use them for writing reusable code.
Interfaces
An interface is used to define an abstract type that defines behaviors as method signatures. Instances of different types can implement the same interface and provide a way for a developer to reuse the code.
XML
Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The design goals of XML emphasize simplicity, generality, and usability across the Internet. This is one of the most used formats for exchanging data over the web.
Tuples
A tuple is an immutable collection which is ordered and unchangeable. It is a common collection in many programming languages.
Element size
Setting the size of the elements on a web page is one of the basic things that any web developer or designer should know.
CTE
A CTE (Common Table Expression) is a temporary result set that can be referenced within another SELECT, INSERT, UPDATE, or DELETE statement. Recursive CTEs can reference themselves, which enables developers to work with hierarchical data.
Ajax
Ajax, which initially stood for Asynchronous JavaScript And XML, is a programming practice of building complex, dynamic webpages using a technology known as XMLHttpRequest. Knowledge of Ajax is important for web developers.
HTTP
The Hypertext Transfer Protocol is the foundation of data communication on the World Wide Web. As such, it's important for all developers who work on internet applications and websites to understand this.
Promise
In JavaScript, a Promise is an object representing the eventual completion or failure of an asynchronous operation. It allows associating handlers with an asynchronous action's eventual success value or failure reason. It is one of the commonly used asynchronous programming techniques in JavaScript.
Stream
A stream is a sequence of data elements made available over time. It is particularly useful for tasks that may benefit from being asynchronous, including tasks such as I/O processing or reading from a file, and as such is important for developers to understand.
Selectors
Selectors are a programming pattern that can be used to select an element from a container. They are primarily used in technologies such as CSS and jQuery to apply styles to groups of elements.
Responsive design
Anyone who works with web should know how to properly implement responsive web design that makes web pages render well on a variety of devices and screen sizes.
CSS advanced
Cascading Style Sheets are the styling language of the web. Knowledge about advanced CSS features is required for seasoned front-end developers.
Pagination
Pagination is the process of dividing data into discrete pages. It can be used to reduce the overhead of fetching large quantities of data, and as such, it is important when developing systems that fetch remote data.
Associative arrays
An associative array (or dictionary) is a data type composed of a collection of key-value pairs, where each possible key appears at most once in the collection. It is used when we need to access items by their keys.
Dynamic Objects
Dynamic objects expose members such as properties and methods at run time, instead of at compile time. This enables you to create objects to work with structures that do not match a static type or format.
Recommended Job Roles
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C# Developer
Full-Stack Developer
JavaScript Developer
SQL Developer
Web Developer
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