Unit 2: Conditionals and Iterations; Functions and Recursion - Practice Quiz

1 Which keyword is used to begin a conditional statement in Python?

2 In a two-way if-else statement, when does the else block execute?

3 Which keyword is used for a multi-way branch to test additional conditions in Python?

4 What does the range(5) function generate when used in a for loop?

5 A while loop in Python continues to execute as long as its condition is:

6 What does the break statement do inside a loop?

7 What does the continue statement do inside a loop?

8 What is a nested loop?

9 Which module in Python is commonly used to generate random numbers?

10 Which function returns a random integer between two given values (inclusive)?

11 How do you call a function named greet in Python?

12 Which function converts a string "25" into an integer?

13 What is the result of float(7) in Python?

14 Which function from the math module returns the square root of a number?

15 What does math.ceil(4.2) return?

16 Which keyword is used to define a new function in Python?

17 In the function definition def add(x, y):, what are x and y called?

18 What is recursion in programming?

19 What is required in every recursive function to prevent infinite recursion?

20 What is the value of the conditional expression "Yes" if 5 > 3 else "No"?

21 What is the value assigned to result after executing the following code?

x = 7
result = "even" if x % 2 == 0 else "odd"

22 How many times will "Hi" be printed?

n = 10
if n > 5:
    if n < 20:
        print("Hi")

23 What does the following code output?

age = 18
if age >= 18:
    print("Adult")
else:
    print("Minor")

24 What is printed by this code?

marks = 75
if marks >= 90:
    print("A")
elif marks >= 70:
    print("B")
elif marks >= 50:
    print("C")
else:
    print("F")

25 What is the output of the following loop?

total = 0
for i in range(1, 5):
    total += i
print(total)

26 How many times does the while loop body execute?

x = 16
count = 0
while x > 1:
    x = x // 2
    count += 1
print(count)

27 What is the output of the following nested loops?

count = 0
for i in range(3):
    for j in range(2):
        count += 1
print(count)

28 What does this code print?

for i in range(1, 6):
    if i == 3:
        continue
    if i == 5:
        break
    print(i, end=" ")

29 Which function call returns a random integer that could be any value in the set ?

30 What is printed by the following code?

def square(n):
    return n * n

print(square(square(2)))

31 What is the result of the following expression?

int("12") + int(3.9)

32 What is the output of the following code?

print(3 + True + 2.0)

33 What does the following code print?

import math
print(math.ceil(4.1) + math.floor(4.9))

34 What is the value of the following expression?

import math
math.sqrt(math.pow(3, 2) + math.pow(4, 2))

35 What does the following program print?

def greet(name):
    print("Hello", name)

x = greet("Sam")
print(x)

36 What is the output of this code using default and keyword arguments?

def power(base, exp=2):
    return base ** exp

print(power(3), power(2, exp=3))

37 What does the following code print?

def info(a, b, c):
    return a - b - c

print(info(c=1, a=10, b=3))

38 What value does fact(4) return?

def fact(n):
    if n <= 1:
        return 1
    return n * fact(n - 1)

39 What is printed by the following recursive function call mystery(3)?

def mystery(n):
    if n == 0:
        return
    print(n, end=" ")
    mystery(n - 1)

40 What is the output of the following code that uses range with a step?

result = []
for i in range(10, 0, -3):
    result.append(i)
print(result)

41 What is the output of the following code?

x = 0
y = 5
result = "A" if x else "B" if y else "C"
print(result)

42 Consider:

values = [0, '', None, [], 'False', 0.0]
count = 0
for v in values:
    if v:
        count += 1
print(count)

43 What does this function return for f(-4)?

def f(n):
    if n % 2 == 0:
        return n // 2
    else:
        return 3 * n + 1

44 What is the output?

score = 85
if score >= 90:
    grade = 'A'
elif score >= 80:
    if score >= 85:
        grade = 'B+'
    else:
        grade = 'B'
elif score >= 70:
    grade = 'C'
else:
    grade = 'F'
print(grade)

45 What is the final value of total?

total = 0
for i in range(2, 20, 3):
    total += i
print(total)

46 How many times does the loop body execute?

n = 100
count = 0
while n > 1:
    n = n // 2
    count += 1
print(count)

47 What is printed?

count = 0
for i in range(4):
    for j in range(i):
        count += 1
print(count)

48 What is the output?

result = []
for i in range(1, 10):
    if i % 2 == 0:
        continue
    if i > 6:
        break
    result.append(i)
print(result)

49 What does this print?

for i in range(3):
    for j in range(3):
        if j == 1:
            break
        print(i, j)

50 Given import random; random.seed(0), which statement is true about random.randint(1, 6)?

51 What is the possible range of values produced by random.randrange(2, 20, 4)?

52 What is the output?

def g(x):
    return x * 2

def h(x):
    return x + 3

print(g(h(g(2))))

53 What is the result of the following?

print(int("10", 2) + int("10", 8) + int("10", 16))

54 What is the output?

print(int(True) + float("3.5") + int("7"))

55 What does the following evaluate to?

import math
print(math.floor(math.sqrt(50)) + math.ceil(math.log2(10)))

56 What is the output?

import math
print(math.gcd(48, 36), math.factorial(4) % 7)

57 What is printed?

def make_counter():
    count = 0
    def inc():
        nonlocal count
        count += 1
        return count
    return inc

c = make_counter()
print(c(), c(), c())

58 What is the output?

def f(a, b=[]):
    b.append(a)
    return b

print(f(1))
print(f(2))
print(f(3, []))

59 What does mystery(4) return?

def mystery(n):
    if n <= 1:
        return 1
    return n * mystery(n - 1)

60 How many times is fib called (including the initial call) when computing fib(4)?

def fib(n):
    if n < 2:
        return n
    return fib(n - 1) + fib(n - 2)