CBSE Class 12 Computer Science Functions In Python Assignment

Short Answer Type Questions :

Question: What is default parameter?
Answer: A parameter having default value in the function header is known as a default parameter.

Question: What is a Library in Python?
Answer: A Library is a collection of modules that together caters to specific types of needs or applications.Like NumPy library of Python caters to scientific computing needs.

Question: Is it necessary to have a base case in a recursive function?
Answer: Yes

Question: What is base case in recursion?
Answer: Preknown case of recursive function, whose solution is pre-known is called base case.

Question: What is recursion?
Answer: Recursion refers to a programming technique in which function calls itself either directly or indirectly.,

Question:. What is module in Python?
Answer: A module is a file with .py extension that contains variables, class definitions, statements and functions related to a particular task.

Question: When is recursion endless?
Answer: An infinite recursion is when recursive function calls itself endlessly.

Question: Array for binary search should be sorted or not?
Answer: Yes

Question: Can a function return multiple values in python?
Answer: YES.

Question: What will be the output of the following code?
a=1
def f():
a=10
print(a)
Answer: The code will print 1 to the console.

Question: Consider the following function headers. Identify the correct statement: –
1) def correct(a=1,b=2,c): 2) def correct(a=1,b,c=3):
3) def correct(a=1,b=2,c=3): 4) def correct(a=1,b,c):
Answer: – 3) def correct(a=1,b=2,c=3)

Question: Write the features of a module.
Answer: – 1) Modules can be reused in other programmes
2) It is independent group of code and data

Question: Create a package ArithmeticOperations (named AO) contain sum, product and difference of two numbers and use it in your main programme.
Answer: – def ADD(X,Y):
return (X+Y)
def PRODUCT(X,Y):
return(X*Y)
def DIFFERENCE(X,Y):
return(X-Y)
Now lets save this file as AO.py then our module is created now.
Now we are creating our main python file: –
import AO
n1=int(input(‘Enter a Number’))
n2=int(input(‘Enter another Number’))
print(‘Sum = ‘, AO.ADD(n1,n2))
print(‘Difference=’,AO.DIFFERENCE(n1,n2))
print(‘Product=’,AO.PRODUCT(n1,n2))

Question: Find the output:
a) def out(n):
if(n==0):
return
else:
out(n-1)
print(n)
n=6
out(n)
b) def sum(n):
if(n==1):
return 1
return n*n+sum(n-1)
n=4
print(“Sum is:”,sum(n))
c) def compute(a,b):
if(b==0):
return a
else:
return compute(a,a%b)
a=6
b=2
c=compute(a,b)
print(“Computer data:”,c)
Answer: a) 
1
2
3
4
5
6
b) Sum is: 30
c) Computer data: 6

Question: What are the advantage and disadvantage of recursion?
Answer: Advantages of Recursion:
i. Recursive functions make the code look clean and elegant.
ii. A complex task can be broken down into simpler sub-problems using recursion.
iii. Sequence generation is easier with recursion than using some nested iteration.
Disadvantages of Recursion:
i. Sometimes the logic behind recursion is hard to follow through.
ii. Recursive calls are expensive (inefficient) as they take up a lot of memory and time.
iii. Recursive functions are hard to debug.

Question: Write recursive code to compute the factorial of an integer.
Answer: def calc_factorial(x):
if x == 1:
return 1
else:
return (x * calc_factorial(x-1))
num = 4
print(“The factorial of”, num, “is”, calc_factorial(num))

Question: Rewrite the correct code after removing the errors: –
def SI(p,t=2,r):
return (p*r*t)/100
Answer: – def SI(p, r, t=2):
return(p*r*t)/100

Application Based Questions :

Question: How many values a python function can return? Explain how?
Answer: Python function can return more than one values.
def square_and_cube(X):
return X*X, X*X*X, X*X*X*X
a=3
x,y,z=square_and_cube(a)
print(x,y,z)

Question: Predict the output of the following code fragment?
def check(n1=1, n2=2):
n1=n1+n2
n2+=1
print(n1,n2)
check()
check(2,1)
check(3)
Answer: 3 3
3 2
5 3

Question: Write a python program to sum the sequence given below. Take the input n from the user.   img
Answer: def fact(x):
j=1 , res=1
while j<=x:
res=res*j
j=j+1
return res
n=int(input(“enter the number : “))
i=1, sum=1
while i<=n:
f=fact(i)
sum=sum+1/f
i+=1
print(sum)

Question: Write a program to compute GCD and LCM of two numbers def gcd(x,y):
Answer: while(y):
x, y = y, x % y
return x
def lcm(x, y):
lcm = (x*y)//gcd(x,y)
return lcm
num1 = int(input(“Enter first number: “))
num2 = int(input(“Enter second number: “))
print(“The L.C.M. of”, num1,”and”, num2,”is”, lcm(num1, num2))
print(“The G.C.D. of”, num1,”and”, num2,”is”, gcd(num1, num2))