Test Your Knowledge

Test your Python skills with the quiz below.

Question 1

What is the output of print(2 ** 3)?

6
8
9
5

Question 2

Which of the following are valid dictionary methods in Python? (Select all that apply)

keys()
values()
items()
elements()

Question 3

Which of the following are valid Python code? (Select all that apply)

```
a = 25
b = 30
print(a + b)
```
```
print("Hello World!")
```
```
printf("Hello World!")
```
```
println("Hello World!")
```

Question 4

What is the error in the following Python code?

a = 10
b = "5"
print(a + b)

A SyntaxError, because the code is improperly formatted.
A TypeError, because you cannot add an integer and a string.
No error, it will print 15.
No error, it will print 105.

Question 5

Which query correctly handles potential NULL values in string concatenation?

SELECT first_name + ' ' + last_name AS full_name 
FROM guest 
WHERE guest_id IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

SELECT COALESCE(first_name, 'Unknown') + ' ' + COALESCE(last_name, 'Guest') AS full_name 
FROM guest 
WHERE registration_date >= '2023-01-01' AND status = 'active';

SELECT ISNULL(first_name + ' ' + last_name, 'Unknown Guest') AS full_name 
FROM guest 
WHERE email IS NOT NULL AND phone_number IS NOT NULL;

SELECT CONCAT(IFNULL(first_name, ''), ' ', IFNULL(middle_name, ''), ' ', IFNULL(last_name, '')) AS full_name 
FROM guest_table 
WHERE created_at > NOWD() - INTERVAL 30 DAY;

Question 6

What is the derivative of

\[ f(x) = x^2 + 3x + 5 \]

\(f'(x) = x + 3\)
\(f'(x) = 2x + 3\)
\(f'(x) = 2x^2 + 3x\)
\(f'(x) = x^2 + 3\)

Question 7

Which of the following integrals are correctly evaluated? (Select all that apply)

\[\int_0^1 x^2 dx = \frac{1}{3}\]
\[\int_0^{\pi} \sin(x) dx = 0\]
\[\int_1^e \frac{1}{x} dx = 1\]
\[\int_{-1}^{1} x dx = 1\]