Page 510 - ComputerScience_Class_11

MIND DRILL

Solved Questions

A. Tick ( ) the correct option.
1. Which statement is used to repeat actions in Python?
a. if b. else
c. for / while d. print
2. Which loop is used when the number of iterations is known beforehand?
a. for loop b. do-while loop
c. while loop d. infinite loop
3. According to PEP 8 guidelines, how many spaces should be used for indentation?
a. 2 spaces b. 3 spaces
c. 8 spaces d. 4 spaces
4. Which symbol is used instead of curly braces in Python to define blocks?
a. Semicolon b. Indentation
c. Colon only d. Comma
5. What happens when an if condition is False?
a. Program stops b. Error occurs
c. Block is skipped d. Loop starts
Answers
1. c 2. a 3. d 4. b 5. c

B. Fill in the blanks.
1. ………………… refers to the sequence in which statements or function calls are executed within a program.
2. Indentation refers to the ………………… or tabs used at the beginning of a line of code to define the structure of the program.
3. Sequential flow of control refers to the ………………… order in which instructions in a program are executed.
4. The ………………… statement is one of the most fundamental control structures in Python, allowing the program to make decisions
based on a condition.
5. A ………………… statement is used when you want to check a condition inside another condition.
Answers
1. Flow of control 2. Spaces 3. Default 4. If 5. Nested if

C. Answer the following questions:
1. What is a control variable in a loop?
Ans. A control variable is a variable whose value changes during loop execution and controls the loop’s repetition.
2. Define the term programming construct.
Ans. A programming construct is a structure used to control the flow of execution in a program, such as conditional and iterative
statements.
3. What is a nested if statement?
Ans. A nested if statement is an if statement placed inside another if, elif or else block to check multiple conditions hierarchically.
4. What is the purpose of loop control statements?
Ans. They modify loop execution by stopping, skipping or doing nothing in an iteration using break, continue and pass.
5. What are entry-controlled loops? Does Python support exit-controlled loops?
Ans. Entry-controlled loops check the condition before entering the loop body. If the condition is False initially, the loop does not
execute. Both for and while loops in Python are entry-controlled loops. Python does not support exit-controlled loops like
do-while or repeat-until.

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