Peer Instruction: Functions Multiple Choice Questions¶

Q-1: What does the following code print?

def foo():
        print("Raaarrr I'm a bear")

def bar():
        print("Eeek a bear!")

foo()

Raaarrr I'm a bear
Correct! The function "foo()" has been called in the last line. So, the print statement under it will be executed.
Eeek a bear!
Incorrect! The function "foo()" has been called in the last line and NOT "bar()". So, the print statement under "foo()" will be executed and returned.
Both
Incorrect! The function "foo()" has been called in the last line and NOT "bar()". So, the print statement under "foo()" will be executed and returned.
Neither
Incorrect! The function "foo()" has been called in the last line and NOT "bar()". So, the print statement under "foo()" will be executed and returned.
I don't know
Incorrect! The function "foo()" has been called in the last line and NOT "bar()". So, the print statement under "foo()" will be executed and returned.

Q-2: What does the following code print?

def first(a):
   a=8

a = 20
first(a)
print(a)

0
Incorrect! Change in the values of a function's arguments doesn't change the assigned value of a variable. Try replacing "first(a)" with "first(x)" in function definition.
8
Incorrect! Change in the values of a function's arguments doesn't change the assigned value of a variable. Try replacing "first(a)" with "first(x)" in function definition.
20
Correct! Change in the values of a function's arguments doesn't change the assigned value of a variable.
Error, because a cannot be assigned in two places
Incorrect! Change in the value of a function's arguments doesn't change the assigned value of a variable. Try replacing "first(a)" with "first(x)" in function definition.
I don't know
Incorrect! Change in the values of a function's arguments doesn't change the assigned value of a variable. Try replacing "first(a)" with "first(x)" in function definition.

Q-3: What does the following code print?

def calculate(w, x, y):
   a=x
   b=w+1
   return a + b + 3

print(calculate(3, 2, 0))

5
Incorrect! Here, a=x=2 and b= 3+1 = 4. So, a + b + 3 = 2 + 4 + 3 = 9.
9
Correct! Here, a=x=2 and b= 3+1 = 4. So, a + b + 3 = 2 + 4 + 3 = 9.
0
Incorrect! Here, a=x=2 and b= 3+1 = 4. So, a + b + 3 = 2 + 4 + 3 = 9.
3
Incorrect! Here, a=x=2 and b= 3+1 = 4. So, a + b + 3 = 2 + 4 + 3 = 9.
I don't know
Incorrect! Here, a=x=2 and b= 3+1 = 4. So, a + b + 3 = 2 + 4 + 3 = 9.

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Q-4: Which sets x to the value 5?

def f1():
   return 5

def f2():
   print(5)

def f3():
   return print(5)

x = f1()
Correct! Only function "f1()" has a return statement.
x = f2()
Incorrect! Only function "f1()" has a return statement.
x = f3()
Incorrect! Only function "f1()" has a return statement.
All of the above
Incorrect! Only function "f1()" has a return statement.
I don't know
Incorrect! Only function "f1()" has a return statement.

Q-5: Which of the following are true about this code?

def add_one(x):
return x + 1

x = 2
x = x + add_one(x)

No bugs. The code is fine.
Incorrect! Body of the function is not indented.
The function body is not indented.
Correct! Function body should be indented in Python.
We use x as both a parameter and a variable, but we are not allowed to do that
Incorrect! x can be defined as both a parameter and variable in Python.
B and C
Incorrect! Function body should be indented in Python. x can be defined as both a parameter and variable in Python.
I don't know
Incorrect! Body of the function is not indented.

Q-6: What does the following code print?

def odd(y,x):
   y = y +1
   x = x + 1
   print(x*y)

def main():
   x = 2
   y = 4
   odd(x,y)
   print(x*y)

8, 8
Incorrect! Here, odd(4, 2) will return 15 (y = y + 1 = 5 and x = x + 1 = 3) and print(x*y) in main() will return 8. The output of odd() will be printed first as it is initialized first.
15, 15
Incorrect! Here, odd(4, 2) will return 15 (y = y + 1 = 5 and x = x + 1 = 3) and print(x*y) in main() will return 8. The output of odd() will be printed first as it is initialized first.
8, 15
Incorrect! Here, odd(4, 2) will return 15 (y = y + 1 = 5 and x = x + 1 = 3) and print(x*y) in main() will return 8. The output of odd() will be printed first as it is initialized first.
15, 8
Correct! Here, odd(4, 2) will return 15 (y = y + 1 = 5 and x = x + 1 = 3) and print(x*y) in main() will return 8. The output of odd() will be printed first as it is initialized first.
I don't know
Incorrect! Here, odd(4, 2) will return 15 (y = y + 1 = 5 and x = x + 1 = 3) and print(x*y) in main() will return 8. The output of odd() will be printed first as it is initialized first.

Q-7: One of the components of this function is inconsistent with the rest. Which is it?

def sum_eleven(num1, num2, num3):
   '''(int, int, int) -> bool
   Return True iff num1, num2, and num3 sum to 11.
   >>>sum_eleven (4, 5, 2)
   11
   '''
   return num1 + num2 + num3 == 11

Example
Correct! The function returns a boolean but the example returns an integer.
Type contract
Incorrect! The name and type of parameters have been clearly defined. Option A is the answer becauase the function returns a boolean but the example returns an integer.
Header
Incorrect! The syntax of function's header is correct. Option A is the answer becauase the function returns a boolean but the example returns an integer.
Description
Incorrect! The function has been clearly descibed. Option A is the answer becauase the function returns a boolean but the example returns an integer.
Body
Incorrect! The body of the function has been defined accurately. Option A is the answer becauase the function returns a boolean but the example returns an integer.

Q-8: One of the components of this function is inconsistent with the rest. Which is it?

def rightmost_digit(a):
   '''(int) -> bool
   Return the rightmost digit of a.
   >>>rightmost_digit (14)
   4
   '''
   return a % 10

Example
Incorrect! The example has been correctly defined. Option B is right because the function returns an integer but the type of contract indicates bool.
Type contract
Correct! Option B is right because the function returns an integer but the type of contract indicates bool.
Header
Incorrect! The syntax of function's header is correct. Option B is right because the function returns an integer but the type of contract indicates bool.
Description
Incorrect! The function has been clearly descibed. Option B is right because the function returns an integer but the type of contract indicates bool.
Body
Incorrect! The body of the function has been defined accurately. Option B is right because the function returns an integer but the type of contract indicates bool.

Q-9: At a pizzeria, adults order two slices, boys order three slices, and girls order one slice. Each pizza has eight slices. Write a function that takes three parameters representing the number of adults, boys, and girls, and returns the required number of pizzas. Which example is correct?

>>> num_pizzas(1, 2, 3) 2
Correct! The group will need atleast 11 slices. Since each pizza has 8 slices, the group would need atleast 2 pizzas.
>>> num_pizzas(1, 2, 3) 1
Incorrect! The group will need atleast 11 slices. Since each pizza has 8 slices, the group would need atleast 2 pizzas.
>>> num_pizzas(1, 2, 3) 9
Incorrect! The group will need atleast 11 slices. Since each pizza has 8 slices, the group would need atleast 2 pizzas.
>>> num_pizzas(1, 2, 3) 6
Incorrect! The group will need atleast 11 slices. Since each pizza has 8 slices, the group would need atleast 2 pizzas.

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