CBSE Class 11 Computer Conditional And Iterative Statements Worksheet

Short Answer Type Questions

Question: What is the syntax of if-elif statement in Python?
Answer: The syntax of if-elif statement in python is as follows:
 If condition1:
                  #code-block of statements when condition1 is true
elif condion2:
                 #code-block of statements when condition2 is true
elif condition3:
               #code-block of statements when condition3 is true
.
.
.
else:
#code-block of statements when all above conditions are false.

Question: What are loops in Python? How many types of loop are there in Python?
Answer: Loops are iteration constructs in Python. Iteration means repetition of a set of statements
depending upon a condition test. Loops has three basic elements within it to repeat the statements –

-Initialization (Start)
-Check Condition (Stop)
-Updation (Step)
Python provide two types of loop

(i) Conditional Loop while( (Condition based loop)

(ii) Counting loop for (loop for a given number of times).

Question: Rewrite the following code fragment using while loop.
Answer:

Question: What a range() function does? Give an example.
Answer: The range() function returns a sequence of numbers, starting from 0 by default, and increments
by 1 (by default), and ends at a specified number. its syntax is range(start, stop, step) e.g.
x = range(3, 6)                     x = range(1, 10,2)
for n in x:                                   for n in x:
print(n)                                    print(n)
#This code will print 3 4 5 #         This code will print 1 3 5 7 9

Question: What are jump statements in Python? Name jump statements with example.
Answer: Python offers two jump statements to be used with in loops to jump out of loop-iterations.
These are break and continue statements. 

Question: Rewrite the following code fragment using for loop. 5
Answer:

Skill Based Questions

Question: WAP to compute the result when two numbers and one operator is given by user.
Answer:

Question: WAP to print first n odd numbers in descending order.
Answer:

Question: WAP that searches for prime numbers from 15 through 25.
 Answer:

Question: WAP to test if given number is prime or not.
Answer:

Question: WAP to input a digit and print it in words.
Answer:

Question: WAP to print the following series –
(i) 1 4 7 10 . . . . . . .40
(ii) 1 -4 7 -10 . . . . . . . . -40
Answer:

Question: WAP to find the average of the list of the numbers entered through keyboard.
Answer:

Question: WAP to check whether square root of a given number is prime or not.
Answer:

Question: WAP to calculate the roots of a given quadratic equation.
Answer:

Question: WAP to find the largest number from the list of the numbers entered through keyboard.
Answer:

Question: WAP to find the sum of first n even numbers.
Answer:

Question: WAP to print the following pattern
(a) * (b) * (c) A (d) 0
* * * * A B 2 2
* * * * * * A B C 4 4 4
* * * * * * * * A B C D 8 8 8 8
* * * * * * * * * * A B C D E
Answer:

Question: WAP to find the 2nd largest number from the list of the numbers entered through
keyboard. (This program is from List Chapter) 
Answer:

Question: WAP to find the sum of n natural numbers.
Answer:

Question: WAP to find the sum of first n odd numbers.
Answer: