Q: Question 9What are the four elements of a while loop in Python?

The four elements of a while loop in Python are:Initialization Expressions — It initializes the loop control variable and it is given outside the while loop before the beginning of the loop.Test Expression — If its truth value is true then the loop-body gets executed otherwise not.The Body of the Loop — It is the set of statements that are executed repeatedly in loop.Update Expressions — It updates the value of loop control variable and it is given inside the while loop.

Q: Question 1Rewrite the following code fragment that saves on the number of comparisons:if (a == 0) : print ("Zero") if (a == 1) : print ("One") if (a == 2) : print ("Two") if (a == 3) : print ("Three")

if (a == 0) : print ("Zero") elif (a == 1) : print ("One") elif (a == 2) : print ("Two") elif (a == 3) : print ("Three")

Q: Question 3What is the output produced by the following code?x = 1 if x > 3 : if x > 4 : print ("A", end = ' ') else : print ("B", end = ' ') elif x < 2: if (x != 0): print ("C", end = ' ') print ("D")

OutputC D ExplanationAs value of x is 1 so statements in the else part of outer if i.e. elif x < 2: will get executed. The condition if (x != 0) is true so C is printed. After that the statement print ("D") prints D.

Q: Question 4What is the error in following code? Correct the code:weather = 'raining' if weather = 'sunny' : print ("wear sunblock") elif weather = "snow": print ("going skiing") else : print (weather)

In this code, assignment operator (=) is used in place of equality operator (==) for comparison. The corrected code is below:weather = 'raining' if weather == 'sunny' : print ("wear sunblock") elif weather == "snow": print ("going skiing") else : print (weather)

Q: Question 6Find the errors in the code given below and correct the code:if n == 0 print ("zero") elif : n == 1 print ("one") elif n == 2: print ("two") else n == 3: print ("three")

The corrected code is below:if n == 0 : #1st Error print ("zero") elif n == 1 : #2nd Error print ("one") elif n == 2: #3rd Error print ("two") elif n == 3: #4th Error print ("three")

Q: Question 10bRewrite following code fragment using while loops :for i in range(1, 16) : if i % 3 == 0 : print (i)

i = 1 while i < 16: if i % 3 == 0 : print (i) i += 1

Question 1

Question 39How many times does the following code execute ?x = 1
while (x <= 5):
    x + 1
print (x)6145infinite

Accepted Answer

Answer: infinite

Source: This question is from Flow of Control, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Flow of Control: Question, Times, Code, Execute, While, Print. These are fundamental topics in Computer Science that students are expected to master as part of the CBSE Class 11 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach MCQsMultiple choice questions test your ability to quickly recall facts and apply concepts. Read all options carefully before selecting your answer. Use the process of elimination to rule out clearly incorrect options first. If two options seem similar, look for the subtle difference that makes one more accurate. For numerical MCQs, verify your answer by substituting it back into the problem.
Key Points to RememberWrite programs with proper indentation and comments.
Trace through your code with sample inputs to verify correctness.
Explain the logic behind each step of your solution.
Familiarise yourself with common library functions and methods.
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Question 2

Question 40What is the output produced when this code executes?i = 1
while (i <= 7):
    i*= 2
print (i)816414no output

Accepted Answer

Answer: 8

Source: This question is from Flow of Control, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Flow of Control: Question, Output, Produced, Code, Executes, While. These are fundamental topics in Computer Science that students are expected to master as part of the CBSE Class 11 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach MCQsMultiple choice questions test your ability to quickly recall facts and apply concepts. Read all options carefully before selecting your answer. Use the process of elimination to rule out clearly incorrect options first. If two options seem similar, look for the subtle difference that makes one more accurate. For numerical MCQs, verify your answer by substituting it back into the problem.
Key Points to RememberWrite programs with proper indentation and comments.
Trace through your code with sample inputs to verify correctness.
Explain the logic behind each step of your solution.
Familiarise yourself with common library functions and methods.
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Question 3

Question 41Consider the following loop:j = 10
while j >= 5:
    print("X")
    j=j-1Which of the following for loops will generate the same output as the loop shown previously?for j in range(-1, -5, -1):    print("X")for j in range(0, 5):    print("X")for j in range(10, -1, -2):    print("X")for j in range(10, 5):    print("X")for j in range(10, 5, -1):    print("X")

Accepted Answer

Answer: print("X")

Source: This question is from Flow of Control, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Flow of Control: Question, Consider, Loop, While, Print, Loops. These are fundamental topics in Computer Science that students are expected to master as part of the CBSE Class 11 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach MCQsMultiple choice questions test your ability to quickly recall facts and apply concepts. Read all options carefully before selecting your answer. Use the process of elimination to rule out clearly incorrect options first. If two options seem similar, look for the subtle difference that makes one more accurate. For numerical MCQs, verify your answer by substituting it back into the problem.
Key Points to RememberWrite programs with proper indentation and comments.
Trace through your code with sample inputs to verify correctness.
Explain the logic behind each step of your solution.
Familiarise yourself with common library functions and methods.
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Question 4

Question 42What is the output produced when this code executes?a = 0
for i in range(4,8):
    if i % 2 == 0:
        a = a + i
print (a) 481018

Accepted Answer

Answer: 10

Source: This question is from Flow of Control, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Flow of Control: Question, Output, Produced, Code, Executes, Range. These are fundamental topics in Computer Science that students are expected to master as part of the CBSE Class 11 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach MCQsMultiple choice questions test your ability to quickly recall facts and apply concepts. Read all options carefully before selecting your answer. Use the process of elimination to rule out clearly incorrect options first. If two options seem similar, look for the subtle difference that makes one more accurate. For numerical MCQs, verify your answer by substituting it back into the problem.
Key Points to RememberWrite programs with proper indentation and comments.
Trace through your code with sample inputs to verify correctness.
Explain the logic behind each step of your solution.
Familiarise yourself with common library functions and methods.
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Question 5

Question 43Which of the following code segments contain an example of a nested loop?for i in range(10):    print(i)for j in range(10):    print(j)for i in range(10):    print(i)    for j in range(10):        print(j)for i in range(10):    print(i)    while i < 20:        print(i)        i = i + 1for i in range(10):    print(i)while i < 20:    print(i)

Accepted Answer

Answer: print(j), i = i + 1

Source: This question is from Flow of Control, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Flow of Control: Question, Code, Segments, Contain, Nested, Loop. These are fundamental topics in Computer Science that students are expected to master as part of the CBSE Class 11 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach MCQsMultiple choice questions test your ability to quickly recall facts and apply concepts. Read all options carefully before selecting your answer. Use the process of elimination to rule out clearly incorrect options first. If two options seem similar, look for the subtle difference that makes one more accurate. For numerical MCQs, verify your answer by substituting it back into the problem.
Key Points to RememberWrite programs with proper indentation and comments.
Trace through your code with sample inputs to verify correctness.
Explain the logic behind each step of your solution.
Familiarise yourself with common library functions and methods.
Related Questions from Flow of ControlQ1: Question 1 Rewrite the following code fragment that saves on the number of comparisons: if ( a == 0...
Q10: Question 9b Rewrite the following code fragment using for loop: while num > 0 : print ( num % 10 )...
Q11: Question 9c Rewrite the following code fragment using for loop: while num > 0 : count += 1 sum +=...
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Q13: Question 10b Rewrite following code fragment using while loops : for i in range ( 1 , 16 ) : if i %...
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Question 6

Question 9What are the four elements of a while loop in Python?

Accepted Answer

The four elements of a while loop in Python are:Initialization Expressions — It initializes the loop control variable and it is given outside the while loop before the beginning of the loop.Test Expression — If its truth value is true then the loop-body gets executed otherwise not.The Body of the Loop — It is the set of statements that are executed repeatedly in loop.Update Expressions — It updates the value of loop control variable and it is given inside the while loop.

Question 7

Question 1Rewrite the following code fragment that saves on the number of comparisons:if (a == 0) : 
  print ("Zero")
if (a == 1) : 
  print ("One")
if (a == 2) : 
  print ("Two")
if (a == 3) : 
  print ("Three")

Accepted Answer

if (a == 0) : 
  print ("Zero")
elif (a == 1) :
  print ("One")
elif (a == 2) :
  print ("Two")
elif (a == 3) :
  print ("Three")

Question 8

Question 3What is the output produced by the following code?x = 1                        
if x > 3 :
   if x > 4 :                
         print ("A", end = ' ')
   else :                    
         print ("B", end = ' ')
elif x < 2:                  
   if (x != 0):
         print ("C", end = ' ')
print ("D")

Accepted Answer

OutputC D
ExplanationAs value of x is 1 so statements in the else part of outer if i.e. elif x < 2: will get executed. The condition if (x != 0) is true so C is printed. After that the statement print ("D") prints D.

Question 9

Question 4What is the error in following code? Correct the code:weather = 'raining'       
if weather = 'sunny' :
   print ("wear sunblock")
elif weather = "snow":    
   print ("going skiing") 
else :                    
   print (weather)

Accepted Answer

In this code, assignment operator (=) is used in place of equality operator (==) for comparison. The corrected code is below:weather = 'raining'       
if weather == 'sunny' :
   print ("wear sunblock")
elif weather == "snow":    
   print ("going skiing") 
else :                    
   print (weather)

Question 10

Question 6Find the errors in the code given below and correct the code:if n == 0
   print ("zero") 
elif : n == 1     
   print ("one")  
elif             
   n == 2:        
   print ("two") 
else n == 3:      
   print ("three")

Accepted Answer

The corrected code is below:if n == 0 : #1st Error
   print ("zero") 
elif n == 1 : #2nd Error
   print ("one")  
elif n == 2: #3rd Error  
   print ("two") 
elif n == 3: #4th Error     
   print ("three")

Question 11

Question 8How are following two code fragments different from one another? Also, predict the output of the following code fragments :(a)n = int(input( "Enter an integer:" ))
if n > 0 :
    for a in range(1, n + n ) :
        print (a / (n/2))
    else :
        print ("Now quiting")(b)n = int(input("Enter an integer:"))
if n > 0 :
    for a in range(1, n + n) :
        print (a / (n/2))
else :
    print ("Now quiting")

Accepted Answer

In part (a) code, the else clause is part of the loop i.e. it is a loop else clause that will be executed when the loop terminates normally. In part (b) code, the else clause is part of the if statement i.e. it is an if-else clause. It won't be executed if the user gives a greater than 0 input for n.Output of part a:Enter an integer:3
0.6666666666666666
1.3333333333333333
2.0
2.6666666666666665
3.3333333333333335
Now quiting
Output of part b:Enter an integer:3
0.6666666666666666
1.3333333333333333
2.0
2.6666666666666665
3.3333333333333335

Question 12

Question 9bRewrite the following code fragment using for loop:while num > 0 :
    print (num % 10)
    num = num/10

Accepted Answer

l = [1]
for x in l:
    l.append(x + 1)
    if num <= 0:
        break
    print (num % 10)
    num = num/10

Question 13

Question 9cRewrite the following code fragment using for loop:while num > 0 :
    count += 1
    sum += num
        num –= 2
        if count == 10 :
            print (sum/float(count))
            break

Accepted Answer

for i in range(num, 0, -2):
    count += 1
    sum += i
    if count == 10 :
        print (sum/float(count))
        break

Question 14

Question 10aRewrite following code fragment using while loops :min = 0
max = num
if num < 0 :
    min = num
    max = 0 # compute sum of integers
            # from min to max

for i in range(min, max + 1):
        sum += i

Accepted Answer

min = 0
max = num
if num < 0 :
    min = num
    max = 0 # compute sum of integers
            # from min to max
    i = min
    while i <= max:
        sum += i
        i += 1

Question 15

Question 10bRewrite following code fragment using while loops :for i in range(1, 16) :
  if i % 3 == 0 :      
     print (i)

Accepted Answer

i = 1
while i < 16:
    if i % 3 == 0 :
        print (i)
    i += 1

Question 16

Question 10cRewrite following code fragment using while loops :for i in range(4) :
    for j in range(5):
        if i + 1 == j or j + 1 == 4 :
           print ("+", end = ' ')
    else :
        print ("o", end = ' ')
print()

Accepted Answer

i = 0
while i < 4:
    j = 0
    while j < 5:
        if i + 1 == j or j + 1 == 4 :
            print ("+", end = ' ')
        j += 1
    else :
        print ("o", end = ' ')
    i += 1
print()

Question 17

Question 11bPredict the output of the following code fragments:x = 10
y = 0
while x > y: 
   print (x, y)
   x = x - 1
   y = y + 1

Accepted Answer

Output10 0
9 1
8 2
7 3
6 4
ExplanationxyOutputRemarks10010 01st Iteration9110 09 12nd Iteration8210 09 18 23rd Iteration7310 09 18 27 34th Iteration6410 09 18 27 36 45th Iteration

Question 18

Question 11fPredict the output of the following code fragments:for x in range(5):
   print (x)

Accepted Answer

Output0
1
2
3
4
Explanationrange(5) will generate a sequence like this [0, 1, 2, 3, 4]. x will be assigned each of the values from this sequence one by one and that will get printed.

Question 19

Question 11gPredict the output of the following code fragments:for p in range(1,10):
   print (p)

Accepted Answer

Output1
2
3
4
5
6
7
8
9
Explanationrange(1,10) will generate a sequence like this [1, 2, 3, 4, 4, 5, 6, 7, 8, 9]. p will be assigned each of the values from this sequence one by one and that will get printed.

Question 20

Question 11hPredict the output of the following code fragments:for q in range(100, 50, -10):
   print (q)

Accepted Answer

Output100
90
80
70
60
Explanationrange(100, 50, -10) will generate a sequence like this [100, 90, 80, 70, 60]. q will be assigned each of the values from this sequence one by one and that will get printed.

Flow of Control

Multiple Choice Questions

Type A : Short Answer Questions/Conceptual Questions

Type B: Application Based Questions

Type C: Programming Practice/Knowledge based Questions