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Understanding Concepts Quiz

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#1

What is the output of the following code snippet in Python?
print(2 + 2 * 3)

14
Explanation

Follows order of operations; prints result of 2 + (2 * 3).

#2

What does SQL stand for?

Structured Query Language
Explanation

SQL stands for Structured Query Language.

#3

Which of the following is NOT a valid data type in Python?

character
Explanation

'character' is not a valid Python data type.

#4

In the context of databases, what does CRUD stand for?

Create, Retrieve, Update, Delete
Explanation

CRUD stands for Create, Retrieve, Update, Delete in databases.

#5

What is the output of the following code snippet in JavaScript?
console.log(0 == '0');

true
Explanation

JavaScript coerces types; 0 is equal to '0'.

#6

Which of the following is NOT a valid HTTP request method?

UPDATE
Explanation

'UPDATE' is not a valid HTTP request method.

#7

What is the main purpose of encapsulation in object-oriented programming?

To hide the implementation details of a class and only expose the necessary functionalities
Explanation

Encapsulation safeguards implementation, exposing only essential functionalities.

#8

Which data structure uses First In First Out (FIFO) principle?

Queue
Explanation

Queue follows First In First Out (FIFO) order.

#9

What is the purpose of a constructor in object-oriented programming?

To initialize the data members of a class
Explanation

Constructors initialize class data members.

#10

What is the output of the following code snippet in Java?
int x = 5;
System.out.println(x++);

5
Explanation

Prints the current value of 'x' and then increments it.

#11

What is the purpose of the 'elif' keyword in Python?

To check multiple conditions sequentially until one is true
Explanation

'elif' checks conditions sequentially and executes the first true block.

#12

What is the purpose of the 'finally' block in a try-except-finally statement in Python?

To execute code regardless of whether an exception occurs or not
Explanation

'finally' executes code regardless of exception occurrence.

#13

What is the time complexity of the quicksort algorithm in the worst-case scenario?

O(n^2)
Explanation

Quicksort's worst-case time complexity is O(n^2).

#14

Which of the following sorting algorithms has the lowest worst-case time complexity?

Merge Sort
Explanation

Merge Sort has the lowest worst-case time complexity among the given sorting algorithms.

#15

Which of the following is NOT a valid HTTP status code?

600
Explanation

HTTP status codes do not include '600'.

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