# Python Recursion: MCQs on Recursion in Python Language

Python Recursion. MCQs on the topic of Recursion in Python Language.

## Python Recursion

What will be the output of the following Python code ??

def a(n):
if n == 0:
return 0
elif n == 1:
return 1
else:
return a(n-1)+a(n-2)
for i in range(0,4):
print(a(i),end=” “)

a) 0 1 2 3
b) An exception is thrown
c) 0 1 1 2 3
d) 0 1 1 2

Which of these is not true about recursion ??

a) It’s easier to code some real-world problems using recursion than non-recursive equivalent
b) Recursive functions are easy to debug
c) Recursive calls take up a lot of memory
d) Programs using recursion take longer time than their non-recursive equivalent

Which of these is not true about recursion ??

a) Making the code look clean
b) A complex task can be broken into sub-problems
c) Recursive calls take up less memory
d) Sequence generation is easier than a nested iteration

What happens if the base condition isn’t defined in recursive programs ??

a) Program gets into an infinite loop
b) Program runs once
c) Program runs n number of times where n is the argument given to the function
d) An exception is thrown

Python Recursion

Recursion and iteration are the same programming approach ??

a) True
b) False

What will be the output ??

def fun(n):
if (n > 100):
return n – 5
return fun(fun(n+11));
print(fun(45))

a) 50
b) 100
c) 74
d) Infinite loop

Which of the following statements is false about recursion ??

a) Every recursive function must have a base case
b) Infinite recursion can occur if the base case isn’t properly mentioned
c) A recursive function makes the code easier to understand
d) Every recursive function must have a return value

def a(n):
if n == 0:
return 0
else:
return n*a(n – 1)
def b(n, tot):
if n == 0:
else:
return b(n-2, tot-2)

a) Both a() and b() aren’t tail recursive
b) Both a() and b() are tail recursive
c) b() is tail recursive but a() isn’t
d) a() is tail recursive but b() isn’t

Python Recursion

What is tail recursion ??

a) A recursive function that has two base cases
b) A function where the recursive functions lead to an infinite loop
c) A recursive function where the function doesn’t return anything and just prints the values
d) A function where the recursive call is the last thing executed by the function

What will be the output of the following Python ??

l=[]
def convert(b):
if(b==0):
return l
dig=b%2
l.append(dig)
convert(b//2)
convert(6)
l.reverse()
for i in l:
print(i,end=””)

a) 011
b) 110
c) 3
d) Infinite loop

What will be the output of the code ??

def test(i,j):
if(i==0):
return j
else:
return test(i-1,i+j)
print(test(4,7))

a) 13
b) 7
c) Infinite loop
d) 17

Fill in the line of the following Python code for calculating the factorial of a number ??

def fact(num):
if num == 0:
return 1
else:
return _____________________

a) num*fact(num-1)
b) (num-1)*(num-2)
c) num*(num-1)
d) fact(num)*fact(num-1)

Python Recursion

Which of these is false about recursion ??

a) Recursive function can be replaced by a non-recursive function
b) Recursive functions usually take more memory space than non-recursive function
c) Recursive functions run faster than non-recursive function
d) Recursion makes programs easier to understand

Only problems that are recursively defined can be solved using recursion ??

a) True
b) False

Which is the most appropriate definition for recursion ??

a) A function that calls itself
b) A function execution instance that calls another execution instance of the same function
c) A class method that calls another class method
d) An in-built method that is automatically called

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