AI and You Ch. 8 Statements in Python questions answers

 

Chapter : 8        Statements in Python

A.    Tick the correct answers.

1.     What are iterative statements in Python?

a.     Commands that make a part of the program be executed repeatedly.

b.     Commands that define conditions in a program

c.      Commands that allow user to give input

Answer: a. Commands that make a part of the program be executed repeatedly.

 

2.     look at the following code:

age= int(input("How old are you?"))
if (age>=21):
    print("Adult")
else:
    print("Teenager")

            What will be printed on the screen if the value of age is 21?

a.     Adult          b.         Teenager         c.         Nothing will print

Answer: a. Adult

 

3.     Which for statement will you use to print the multiplication table of 17?

a.     for i in range (1,10,17)

b.     for i in range (10,1,17)

c.      for i in range (17, 171,17)

Answer: c.  for i in range (17, 171,17)

n = int(input("Enter the number "))
for i in range(17,171,17):
    c = n*i
    print(n,"*",i,"=",c) 

output

Enter the number 17

17 * 17 = 289

17 * 34 = 578

17 * 51 = 867

17 * 68 = 1156

17 * 85 = 1445

17 * 102 = 1734

17 * 119 = 2023

17 * 136 = 2312

17 * 153 = 2601

17 * 170 = 2890

 

Process finished with exit code 0

 

4.     The starting value of ‘i’ is 1 and it gets incremented by 1. Which of the following while conditions will you use to repeat a task ten times?

a.     While (i<10)                      b.         while (i<11)                 c.    while (i!=10)

Answer: c.    while (i!=10)

 

5.     Which of these looping conditions will induce an infinite loop? The starting value of I is 0.

a.     While (i>0)            b.         for I in range (1, I, 1)               c.   while (i==0)

Answer : c. while (i==0)

 

B.    Fill in the blanks.

1.     The three types of control statements are sequential, conditional, and iterative.

2.     Statements that allow you to give conditions are called conditional statements.

3.     The if…elif…else statement is used to check multiple conditions.

4.     The while loop is the simplest of all looping structures.

5.     Infinite loops will only stop when there is a user- defined break applied to it.

 

C.    Write T for true or F for False.

1.     There is a clone(:) after the if condition. Answer :- T

2.     For is a conditional statement.              Answer:- F

3.     The if...elif statement can be seen as an if within an if statement. Answer:-  T

4.     A list contains ordered but interchangeable items. Answer:- T

5.     You cannot use else statements in while loop. Answer:- F

 

D. Answer the following questions.

1.     What are control structures?

Answer: According to the structure theorem, any computer program can be written using the basic control structures. A control structure (or flow of control) is a block of programming that analyses variables and chooses a direction in which to go based on given parameters. In simple sentence, a control structure is just a decision that the computer makes. So, it is the basic decision-making process in programming and flow of control determines how a computer program will respond when given certain conditions and parameters.

 

2.     What are the three types of control structures used in Python?

Answer: There are three basic types of control structures:

                                     i.          Sequential Statements,

                                   ii.          Selection or Conditional Statements and

                                  iii.          Iterative or Repetition Statements.

 

 

 

 

 

3.     Differentiate between a list and a tuple.

Answer:

List vs. Tuple

SN	List	Tuple
1	The literal syntax of list is shown by the [].	The literal syntax of the tuple is shown by the ().
2	The List is mutable.	The tuple is immutable.
3	The List has the a variable length.	The tuple has the fixed length.
4	The list provides more functionality than a tuple.	The tuple provides less functionality than the list.
5	The list is used in the scenario in which we need to store the simple collections with no constraints where the value of the items can be changed.	The tuple is used in the cases where we need to store the read-only collections i.e., the value of the items cannot be changed. It can be used as the key inside the dictionary.
6	The lists are less memory efficient than a tuple.	The tuples are more memory efficient because of its immutability.

 

 

 

4.     What is the use of range() function in for loop?

Answer: The range() function

The range() function is used to generate the sequence of the numbers. If we pass the range(10), it will generate the numbers from 0 to 9. The syntax of the range() function is given below.

 

Syntax:

range(start,stop,step size)  

o   The start represents the beginning of the iteration.

o   The stop represents that the loop will iterate till stop-1. The range(1,5) will generate numbers 1 to 4 iterations. It is optional.

o   The step size is used to skip the specific numbers from the iteration. It is optional to use. By default, the step size is 1. It is optional.

 

5.     What are infinite loops?

Answer: Infinite loops are loops that continues forever, and never ends. Loops are those which may last forever, until a given condition is meet. The only way to come out of such a loop is to apply a condition-specific break.