GRT Technical Skills 3

Question 1

Which HTTP status code indicates that a resource has been permanently moved to a new URL?

Accepted Answer

301

Answer

HTTP 301 (Moved Permanently) tells clients and search engines to update their links to the new URL.

Question 2

What is the primary purpose of an index in a database?

Accepted Answer

To speed up data retrieval at the cost of additional storage

Answer

Database indexes allow the engine to locate rows quickly without scanning every row, trading storage space for faster query performance.

Question 3

In software testing, what is the difference between a stub and a mock?

Accepted Answer

Stubs provide canned responses; mocks verify behavior

Answer

Stubs return predefined responses to isolate the unit under test, while mocks additionally verify that specific calls were made.

Question 4

Which design pattern provides a single point of access to an instance of a class throughout an application?

Accepted Answer

Singleton Pattern

Answer

The Singleton Pattern restricts a class to one instance and provides a global access point to that instance.

Question 5

What is the Big-O time complexity of searching for an element in a balanced binary search tree?

Accepted Answer

O(log n)

Answer

In a balanced BST, each comparison eliminates half the remaining nodes, resulting in O(log n) search time.

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