Mettl Coding Fundamentals and Logic 5

Question 1

Which of the following correctly defines recursion?

Accepted Answer

A function that calls itself to solve a smaller instance

Answer

Recursion is when a function calls itself with a smaller input, converging toward a base case.

Question 2

What is the result of the bitwise AND operation: 12 & 10?

Accepted Answer

8

Answer

12 = 1100₂ and 10 = 1010₂; AND gives 1000₂ = 8.

Question 3

A stack currently holds [1, 2, 3] (3 is on top). After pop(), push(4), pop(), what is on top?

Accepted Answer

2

Answer

pop() removes 3 → stack [1,2]; push(4) → [1,2,4]; pop() removes 4 → top is 2.

Question 4

Which of the following is a valid reason to use a queue over a stack?

Accepted Answer

Print job scheduling

Answer

Print job scheduling uses FIFO ordering — the first job submitted is the first printed.

Question 5

What is the output of this code snippet?

def mystery(n):
  return n * (n + 1) // 2
print(mystery(4))

Accepted Answer

10

Answer

mystery(4) = 4 * 5 // 2 = 20 // 2 = 10, the sum of integers 1 through 4.

Mettl Practice Test