Q & A Chapter 2 | Python | Class 10 CBSE | Computer Application

Python Q & A Chapter 2

A. Tick the correct option –

1. (c) Boolean

2. (d) Level

3. (a) Built-in

4. (c) both (a) and (b)

5. (b) control

B. Very Short Answer Type Questions –

1. What is control variable?

The variable which controls the flow of execution of the program is called control variable. These control variables are used in Decision Making statements or Looping statements.

2. What do you mean by Flow of Control?

A computer always executes a program sequentially. It starts execution from the first statement and ends at the last statement. This order of execution of statements is called Flow of Control.

3. How many types of loops are there in Python?

There are two types of loops in python, For loop and While loop.

4. In how many ways you can call range() in Python?

The range() function can be called by three ways. The range() function can be used with three arguments depending on the need of the programmer.

5. Write the syntax of For loop.

for <variable> in range(start, stop, step):

     [statement in body of loop]

C. Short answer type questions –

1. Describe the ways in which range() function is called.

The range is built in function in Python that allows you to generate a series of numbers within a given range. There are three ways you can call range():

• Range(stop)
• Range(start, stop)
• Range(start, stop, step)

(a) range(n) – It takes one argument and generates a set of whole numbers starting from 0 to (n – 1). E.g. range(8) is equivalent to [0,1,2,3,4,5,6,7]

(b) range(start, stop) – It takes two arguments, and generates a set of whole numbers starting from start to stop. E.g. range(3,9) is equivalent to [3,4,5,6,7,8]

(c) range(start, stop, step) – It takes three arguments and generates a set of whole numbers starting from start to stop having the difference of step. E.g. range(1,10,2) is equivalent to [1,3,5,7,9]

2. What is the significance of indentation in python program?

In python program indentation has a special role. It is used to define compound statements or blocks. In a python program, contiguous statements that are indented to the same level are considered part of the same block.

3. What is looping statement?

The looping or iterative statements are used for repeating a set of statements multiple items in a row. In python there are two types of loops while and for loops.

4. Differentiate between

(a) for loop and while loop

For loops are used when you have a block of code which you want to repeat a fixed number of times. The for loop in python is used to print a sequence like list, tuple or dictionary.

The while loop in python is also known as pre tested loop. It allows the block of code to be executed till the condition is true.

(b) If statement and If else statement

The if statement only execute one type of statement which can be either true or false. But in if else statement is able to execute both type of statements which can be either true or false.