Mettl Fundamental Coding Skills Questions and Answers

Question 1

A developer is implementing the 'Back' button functionality for a web browser.
Each time a user visits a new page, the URL is stored.
When the user clicks 'Back,' the most recently visited URL must be retrieved.
Which data structure is the most suitable for managing the browsing history for this feature?

Accepted Answer

Stack

Answer

Queue

Answer

Array List

Answer

Linked List

Question 2

What is the worst-case time complexity for searching for an element in an unsorted array of size 'n' using a linear search?

Accepted Answer

O(n)

Answer

O(log n)

Answer

O(n^2)

Answer

O(1)

Question 3

Review the following pseudo-code snippet. What will be the final value of the `count` variable?

```pseudo-code
count = 0
FOR i FROM 1 TO 5
  IF i % 2 == 0 THEN
    count = count + i
  ELSE
    count = count - 1
  END IF
END FOR
```

Accepted Answer

3

Answer

6

Answer

9

Answer

15

Question 4

Which of the following Object-Oriented Programming (OOP) principles allows a class to have multiple methods with the same name but different parameter lists (signatures)?

Accepted Answer

Polymorphism

Answer

Inheritance

Answer

Encapsulation

Answer

Abstraction

Question 5

What is the primary risk associated with writing a recursive function that does not have a well-defined base case?

Accepted Answer

An infinite recursion leading to a stack overflow error.

Answer

A syntax error during compilation.

Answer

Slower execution compared to an iterative solution.

Answer

The function returning an incorrect value.

Question 6

A developer declares a variable inside a function. Another function in the same program tries to access this variable but fails, resulting in a reference error. What is the most likely reason for this failure?

Accepted Answer

The variable has local scope.

Answer

The variable was declared as a constant.

Answer

The variable has a data type mismatch.

Answer

The variable was not initialized before use.