Question 1

Question 1Assertion (A): When a set of statements is indented under the same block, starting from the same indentation, it is said to be a compound statement.Reasoning (R): Compound Statement begins with a header ending with a colon (:) sign and the statements under the same indentation are marked as a block.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

Both A and R are true and R is the correct explanation of A.ExplanationA compound statement in Python is formed when multiple statements are grouped together under the same block of indentation. The header line begins with a keyword and ends with a colon (:). Subsequent statements that are indented under the same level are considered part of the block.

Question 2

Question 2Assertion (A): The conditional flow of control is implemented using if statement.Reasoning (R): if statements can only be used to execute a single statement or a block of statements if a certain condition is true.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

Both A and R are true and R is the correct explanation of A.ExplanationThe if statement in Python allows conditional flow of control. It evaluates a condition and executes one or more statements based on whether the condition is true or false. If the condition evaluates to true, the statement block following the if statement (indented code) gets executed, otherwise, if the condition is false, that block is skipped, and the program continues with the next statement after the if block.

Question 3

Question 4Assertion (A): When a Python code is unable to accept an input, it results in runtime error.Reasoning (R): Runtime error arises due to incorrect statement that results in no output.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

A is true but R is false.ExplanationWhen a Python code is unable to accept an input, it results in a runtime error. Runtime errors arise due to issues that occur while the program is running, such as attempting to use invalid operations on data types. In contrast, syntax error arises due to incorrect statement that results in no output.

Question 4

Question 5Assertion (A): The break and continue statements are known as jump statements.Reasoning (R): Jump statements are used only with looping constructs and not with conditional constructs.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

Both A and R are true and R is the correct explanation of A.ExplanationIn Python, break and continue are categorized as jump statements because they alter the flow of control in loops. Jump statements, such as break and continue, are used within loop constructs to control the flow of execution. Python does not have a switch-case conditional construct. Hence, in Python, jump statements are not used with conditional constructs.

Question 5

Question 3What is nested loop? Explain with example.

Accepted Answer

A loop may contain another loop as a part of its body. This loop inside a loop is called a nested loop. Once the condition of outer loop is true, the control is transferred to the inner loop. The inner loop is terminated first and then the outer loop terminates.For example,for i in range(1, 4):
    for j in range(1, i+1):
        print(j, end = '')
    print()Output1
12
123
Here, range function will generate value 1, 2, 3 in the outer loop. The inner loop will run for each value of i used in outer loop. The value of outer loop variable will change only after the inner loop completely terminates.

Question 6

Question 6Find error in the following code (if any) and correct it by rewriting the code and underline the corrections:code=input ("Enter season code : ")
if code=w:
   print "winter season" 
elif code==r:
   PRINT "rainy season" 
else:
   Print "summer season"

Accepted Answer

code = input("Enter season code : ")
if code=w: #Error 1
   print "winter season" #Error 2
elif code==r: #Error 3
   PRINT "rainy season" #Error 4 
else:
   Print "summer season" # Error 5Error 1 — The assignment operator '=' is used instead of equality operator '==' in the if statement and the string 'w' should be enclosed in quotes.Error 2 — Parentheses around the print statement are missing.Error 3 — String 'r' should be enclosed in quotes.Error 4 — The print statement should be in lowercase letters and there should be parentheses around the print statement.Error 5 — The print statement should be in lowercase letters and there should be parentheses around the print statement.The corrected code is :code = input("Enter season code: ")
if code == "w":
   print("winter season") 
elif code == "r":  
   print("rainy season") 
else:
   print("summer season")

Question 7

Question 7(i)Write the output of the following:for i in '123':
    print("guru99",i,)

Accepted Answer

Outputguru99 1
guru99 2
guru99 3
ExplanationThe for loop iterates over each character in the string '123'. For each character, it prints "guru99" followed by the character. The comma after i in the print() function ensures a space between "guru99" and each character.

Question 8

Question 7(ii)Write the output of the following:for i in [100,200,300] :
   print (i)

Accepted Answer

Output100
200
300
ExplanationThe above code iterates through each element in the list [100, 200, 300] using a for loop. During each iteration, it prints the current element i.

Question 9

Question 7(iii)Write the output of the following:for j in range (10,6,-2) :
   print (j*2)

Accepted Answer

Output20
16
Explanation1. range(10, 6, -2): This generates a sequence of numbers starting from 10 (inclusive) and decreases by 2 each time, stopping before it reaches 6 (exclusive).The general form of the range function is range(start, stop, step), where:start is the starting number of the sequence.stop is the endpoint (the number is not included in the sequence).step specifies the increment (or decrement, if negative) between each number in the sequence.2. The sequence generated by range(10, 6, -2) is:Start at 10.Decrement by 2: 10 - 2 = 8.The next decrement would be 8 - 2 = 6, but 6 is not included as it is exclusive.So, the sequence generated is: 10, 8.3. for j in range(10, 6, -2):: The for loop iterates over each number in the sequence generated by the range function.4. print(j * 2): This prints the value of j multiplied by 2 for each iteration.Let’s analyze the loop iteration by iteration:First iteration (j = 10):print(10 * 2)This prints:20
Second iteration (j = 8):print(8 * 2)This prints:16
Putting it all together, the full output will be:20
16

Question 10

Question 7(iv)Write the output of the following:for x in range (1, 6) :
   for y in range (1, x+1):
      print (x, ' ', y)

Accepted Answer

Output1   1
2   1
2   2
3   1
3   2
3   3
4   1
4   2
4   3
4   4
5   1
5   2
5   3
5   4
5   5
ExplanationBelow is the detailed explanation of this code:1. Outer Loop: for x in range(1, 6):This loop iterates over the range of numbers starting from 1 up to but not including 6. So, x will take on the values: 1, 2, 3, 4, 5.2. Inner Loop: for y in range(1, x + 1):For each value of x in the outer loop, y will iterate over the range of numbers starting from 1 up to and including x (since x + 1 is exclusive).3. print(x, ' ', y)This prints the current values of x and y separated by a space.Let’s analyze the loops iteration by iteration.Outer loop (x values ranging from 1 to 5):When x = 1:The inner loop range(1, 2) results in y taking values: 1.Output:1   1
When x = 2:The inner loop range(1, 3) results in y taking values: 1, 2.Output:2   1
2   2
When x = 3:The inner loop range(1, 4) results in y taking values: 1, 2, 3.Output:3   1
3   2
3   3
When x = 4:The inner loop range(1, 5) results in y taking values: 1, 2, 3, 4.Output:4   1
4   2
4   3
4   4
When x = 5:The inner loop range(1, 6) results in y taking values: 1, 2, 3, 4, 5.Output:5   1
5   2
5   3
5   4
5   5
Putting all these outputs together, we get:1   1
2   1
2   2
3   1
3   2
3   3
4   1
4   2
4   3
4   4
5   1
5   2
5   3
5   4
5   5

Question 11

Question 7(v)Write the output of the following:for x in range (10, 20):
   if (x == 15):
      break
   print(x)

Accepted Answer

Output10
11
12
13
14
ExplanationThe code starts a for loop where x iterates over the range from 10 to 19. Within each iteration, it checks if x is equal to 15. If true, the break statement exits the loop. Therefore, the loop prints numbers from 10 to 14, each on a new line.

Question 12

Question 7(vi)Write the output of the following:for x in range (10, 20):
   if (x % 2 == 0):
      continue
   print (x)

Accepted Answer

Output11
13
15
17
19
ExplanationBelow is the detailed explanation of this code:for x in range(10, 20): → This loop iterates over the range of numbers starting from 10 (inclusive) up to but not including 20 (exclusive). So, x will take on the values: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19.if x % 2 == 0: → For each value of x, this condition checks if x is an even number. The modulus operator % returns the remainder of x divided by 2. If the remainder is 0, x is even.continue → If the condition x % 2 == 0 is true (i.e., x is even), the continue statement is executed. This statement skips the rest of the code inside the loop for the current iteration and moves to the next iteration.print(x) → This line prints the value of x if it is not even (i.e., if the continue statement is not executed).Let’s analyze the loop iteration by iteration:When x = 10:10 % 2 == 0 is true.continue is executed, so print(x) is skipped.When x = 11:11 % 2 == 0 is false.print(x) outputs:11
When x = 12:12 % 2 == 0 is true.continue is executed, so print(x) is skipped.When x = 13:13 % 2 == 0 is false.print(x) outputs:13
When x = 14:14 % 2 == 0 is true.continue is executed, so print(x) is skipped.When x = 15:15 % 2 == 0 is false.print(x) outputs:15
When x = 16:16 % 2 == 0 is true.continue is executed, so print(x) is skipped.When x = 17:17 % 2 == 0 is false.print(x) outputs:17
When x = 18:18 % 2 == 0 is true.continue is executed, so print(x) is skipped.When x = 19:19 % 2 == 0 is false.print(x) outputs:19
Putting all these outputs together, the full output will be:11
13
15
17
19

Question 13

Question 8Write the output of the following program on execution if x = 50:if x > 10:
   if x > 25:
      print ( 'ok' )
      if x > 60:
           print ( 'good' )
      elif x > 40:
           print ( 'average' )
      else:
           print ('no output')

Accepted Answer

Outputok
average
Explanationif x > 10:The condition checks if x is greater than 10.Since x = 50, which is greater than 10, this condition is true.Nested if x > 25:Since the outer condition is true, the program proceeds to this nested condition, which checks if x is greater than 25.Since x = 50, which is greater than 25, this condition is also true.Consequently, it prints okNested if x > 60:After printing 'ok', the program checks this nested condition, which verifies if x is greater than 60.Since x = 50, which is not greater than 60, this condition is false.Therefore, the program proceeds to the elif part.Nested elif x > 40:This condition checks if x is greater than 40.Since x = 50, which is greater than 40, this condition is true.Consequently, it prints averageThe else blockThe else block is not executed because the elif x > 40: condition was true.

Question 14

Question 9Write the output of the following code:for i in range (2) :
  for j in range (1) :
   if i+2 == j:
      print ("+",end=" ") 
   else:
      print ("o",end=" ")

Accepted Answer

Outputo o
ExplanationLet’s break down the code step-by-step:Outer Loop: for i in range(2): → This loop iterates over the range of numbers starting from 0 up to but not including 2. So, i will take on the values: 0, 1.Inner Loop: for j in range(1): → For each value of i in the outer loop, j will iterate over the range of numbers starting from 0 up to but not including 1. So, j will take on the only value: 0.if i + 2 == j: → This condition checks if i + 2 is equal to j.print("+", end=" ") → If the condition i + 2 == j is true, this statement prints a "+", followed by a space, without moving to a new line.print("o", end=" ") → If the condition i + 2 == j is false, this statement prints an "o", followed by a space, without moving to a new line.Let’s analyze the loops iteration by iteration:First iteration of the outer loop (i = 0):Inner loop (j = 0):i + 2 == j becomes 0 + 2 == 0, which is 2 == 0, is false.Therefore, the else block is executed, and the output is oSecond iteration of the outer loop (i = 1):Inner loop (j = 0):i + 2 == j becomes 1 + 2 == 0, which is 3 == 0, is false.Therefore, the else block is executed, and the output is oSo, combining the outputs of all iterations, the full output will be:o o 
Each "o" is followed by a space, and there is no new line between them due to the end=" " parameter in the print function.

Question 15

Question 10(a)Give the output of the following when num1 = 4, num2 = 3, num3 = 2.num1 += num2 + num3
print(num1)

Accepted Answer

Output9
ExplanationIn the above code, num1 += num2 + num3 is a shorthand notation for num1 = num1 + num2 + num3.Given,num1 = 4
num2 = 3
num3 = 2
First, the expression num2 + num3 is evaluated:num2 + num3 = 3 + 2 = 5
Now the expression becomes:num1 = num1 + 5
which translates to:num1 = 4 + 5 = 9

Question 16

Question 10(b)Give the output of the following when num1 = 4, num2 = 3, num3 = 2.num1 = num1 ** (num2 + num3)
print (num1)

Accepted Answer

Output1024
ExplanationIn the given code, num1 = num1 ** (num2 + num3) calculates the result of raising num1 to the power of the sum of num2 and num3. The expression becomes 4 ** (3 + 2), which simplifies to 4 ** 5. Evaluating 4 ** 5 results in 1024, so the output of print(num1) is 1024.

Question 17

Question 10(c)Give the output of the following when num1 = 4, num2 = 3, num3 = 2.num1 **= num2 + c
print (num1)

Accepted Answer

There is an error in the given code because the variable c is not defined. This will raise a NameError at runtime.

Source: This question is from Conditional and Looping Constructs, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Conditional and Looping Constructs: Question, Output, Num, Print, Conditional and Looping Constructs, Computer Science. 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 This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
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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Practice more questions from Conditional and Looping Constructs &mdash; Computer Science, Class 11 CBSE

Question 18

Question 10(d)Give the output of the following when num1 = 4, num2 = 3, num3 = 2.num1 = '5' + '5'
print (num1)

Accepted Answer

Output55
ExplanationThe expression '5' + '5' performs string concatenation as they are enclosed in quotes. Therefore, '5' and '5' are concatenated to form the string '55', which is then assigned to num1. The print(num1) statement outputs the string '55'.

Question 19

Question 10(e)Give the output of the following when num1 = 4, num2 = 3, num3 = 2.print(4.00 / (2.0+2.0))

Accepted Answer

Output1.0
Explanation1. Evaluate the expression inside the parentheses first:2.0 + 2.0This calculation is straightforward:2.0 + 2.0 = 4.02. Perform the division operation:4.00 / 4.0 = 1.03. Print the result:print(1.0)Therefore, the output of the given code snippet is:1.0

Question 20

Question 10(f)Give the output of the following when num1 = 4, num2 = 3, num3 = 2.num1 = 2 + 9 * ((3*12)-8)/10
print(num1)

Accepted Answer

Output27.2
Explanationnum1 = 2 + 9 * ((3*12)-8)/10Let's calculate this step by step, following the precedence of operators in Python:1. Evaluate the innermost parentheses first:3 * 12 = 362. Replace and continue evaluating inside the parentheses:((3*12)-8) => (36 - 8) = 283. Now, evaluate the multiplication and division:9 * 28 = 2524. Continue with dividing by 10:252 / 10 = 25.25. Finally, add 2:2 + 25.2 = 27.2The print(num1) statement outputs 27.2

Conditional and Looping Constructs

Assertions And Reasons

Solutions To Unsolved Questions