10+ Trainee Developer Interview Questions and Answers

The proper sequence of the given sentence is RQPS.

• The sentence starts with the event of hearing the hue and cry at midnight (R)

• The person did not know what to do (Q)

• He was nervous (P)

• The sentence ends with the person figuring out what to do (S)

Logistic regression is a statistical method for predicting binary classes using a logistic function.

• Used for binary classification problems, e.g., predicting if an email is spam or not.

• The output is a probability value between 0 and 1, interpreted as the likelihood of a class.

• The logistic function (sigmoid) transforms linear combinations of inputs into probabilities.

• Graphically, it produces an S-shaped curve (sigmoid curve) that approaches 0 and 1 asymptotically.

• Commonly used...read more

RDBMS is a type of DBMS that stores data in a structured manner using tables with relationships.

• DBMS is a general term for any software that manages data, while RDBMS is a specific type of DBMS.

• RDBMS stores data in tables with predefined relationships between them.

• RDBMS enforces ACID properties (Atomicity, Consistency, Isolation, Durability) to ensure data integrity.

• Examples of RDBMS include MySQL, Oracle, and SQL Server.

• Examples of non-RDBMS DBMS include MongoDB and Cassandr...read more

Probability of a point making an obtuse angle inside a trapezium with one side.

• The point must lie inside the trapezium.

• The trapezium must have one side that is not parallel to the other.

• Use trigonometry to calculate the angles of the trapezium.

• Calculate the probability of the point making an obtuse angle using the angles of the trapezium.

A list is a collection of items, while a stack is a data structure that follows Last In First Out (LIFO) principle.

• Order of Access: In a list, elements can be accessed in any order, while in a stack, elements are accessed in reverse order of their addition.

• Operations: Lists support various operations like insertion, deletion, and traversal, whereas stacks primarily support push (add) and pop (remove) operations.

• Use Cases: Lists are used for collections of items where order ma...read more

Finding the 2000th term of a sequence involves identifying the pattern or formula governing the sequence.

• Identify the sequence type (arithmetic, geometric, etc.).

• For arithmetic sequences, use the formula: a_n = a_1 + (n-1)d.

• For geometric sequences, use: a_n = a_1 * r^(n-1).

• Example: For the sequence 2, 4, 6, 8 (arithmetic), the 2000th term is 2 + (2000-1)*2 = 4000.

• Example: For the sequence 3, 6, 12, 24 (geometric), the 2000th term is 3 * 2^(2000-1).

Blockchain is a decentralized, digital ledger that records transactions in a secure and transparent manner.

• It is a distributed database that stores information across a network of computers.

• Each block in the chain contains a cryptographic hash of the previous block, creating an unbreakable chain of data.

• It is used in cryptocurrencies like Bitcoin and Ethereum, but also has potential applications in industries like finance, healthcare, and supply chain management.

Browser is a software application used to access and view websites, while hosting environment is the server where websites are stored and accessed.

• Browser is client-side software used to access websites

• Hosting environment is server-side where websites are stored

• Examples of browsers: Chrome, Firefox, Safari

• Examples of hosting environments: Apache, Nginx, Microsoft IIS

Span is an inline element used to group and style text or other inline elements.

• Inline element

• Used for grouping and styling text or other inline elements

• Does not create a new line

IDs are unique identifiers for elements, while classes can be used to group multiple elements together.

• IDs are unique within a page, while classes can be used multiple times.

• IDs are used for specific styling or scripting purposes, while classes are used for styling multiple elements.

• IDs are referenced in CSS with a # prefix, while classes are referenced with a . prefix.

Tokens are used in web development to authenticate users, authorize access to resources, and maintain session state.

• Tokens are often used for user authentication, where a user logs in and receives a token to access protected resources.

• Tokens can also be used for authorization, where different tokens grant different levels of access to resources.

• Tokens can help maintain session state by storing user information and permissions.

• Examples include JSON Web Tokens (JWT) for authent...read more

To detect a loop in a linked list, use Floyd's Cycle Detection Algorithm.

• Use two pointers, slow and fast, to traverse the linked list.

• If there is a loop, the fast pointer will eventually meet the slow pointer.

• Time complexity is O(n) and space complexity is O(1).

A SQL query retrieves data from a database based on specified criteria.

• Use SELECT to specify columns: SELECT column1, column2 FROM table_name;

• Use WHERE to filter results: SELECT * FROM table_name WHERE condition;

• Use JOIN to combine tables: SELECT * FROM table1 JOIN table2 ON table1.id = table2.id;

• Use ORDER BY to sort results: SELECT * FROM table_name ORDER BY column_name ASC/DESC;

• Use GROUP BY to aggregate data: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name...read more