Question 1

Question 2Identifier name cannot be composed of special characters other than ............... .#Hyphen (-)$	ext{	extdollar}$Underscore (_)

Accepted Answer

Underscore (_)Reason — In Python, an identifier name can only be composed of letters (both uppercase and lowercase), digits, and underscores (_). Special characters like #, hyphen (-), and $	ext{	extdollar}$ are not allowed in identifier names.

Question 2

Question 15What is the result of this statement:10>5 and 7>12 or not 18>3
10TrueFalseNone

Accepted Answer

FalseReason — The expression evaluates as follows: 10 > 5 is True because 10 is greater than 5. 7 > 12 is False because 7 is not greater than 12. 18 > 3 is True because 18 is greater than 3, and not True results in False. Combining these using Python's operator precedence, 10 > 5 and 7 > 12 evaluates to False (True and False). Then, False or not True evaluates to False (False or False). Therefore, the entire expression 10 > 5 and 7 > 12 or not 18 > 3 ultimately evaluates to False.

Question 3

Question 16What will be the output of the following Python code?>>> 6*3+4**2//5-8
1314ErrorNone

Accepted Answer

13Reason — The expression 6*3+4**2//5-8 follows Python's operator precedence rules, where exponentiation (4**2) is evaluated first resulting in 16. Then, floor division (16//5) is calculated as 3. Next, multiplication (6*3) gives 18. Adding these results (18 + 3) yields 21. Finally, subtracting 8 from 21 results in 13.

Question 4

Question 17What will be the output of the following Python code?>>> a=72.55
>>> b=10
>>> c=int(a + b)
>>> c
72.557282None of these

Accepted Answer

82Reason — In the above code, a is assigned the floating-point number 72.55, and b is assigned the integer 10. The variable c is assigned the expression a + b resulting in 72.55 + 10 = 82.55. Then, the int() function is used to convert the result of a + b to an integer. Therefore, int(82.55) results in 82.

Question 5

Question 1Write a Python command/instruction/statement to display your name.

Accepted Answer

print("Ankita Sharma")OutputAnkita Sharma

Question 6

Question 3Evaluate the following expressions manually:(a) (2 + 3) ** 3 - 6/2(b) (2 + 3) * 5//4 + (4 + 6)/2(c) 12 + (3 * 4 - 6)/3(d) 12 + (3 ** 4 - 6)//2(e) 12 * 3 % 5 + 2 * 6//4(f) 12 % 5 * 3 + (2 * 6)//4

Accepted Answer

(a) (2 + 3) ** 3 - 6/2= 5**3 - 6/2= 125 - 6/2= 125 - 3.0= 122.0(b) (2 + 3) * 5//4 + (4 + 6)/2= 5 * 5//4 + 10/2= 25 // 4 + 10/2= 6 + 10/2= 6 + 5.0= 11.0(c) 12 + (3 * 4 - 6)/3= 12 + (12 - 6)/3= 12 + 6/3= 12 + 2.0= 14.0(d) 12 + (3 ** 4 - 6)//2= 12 + (81 - 6)//2= 12 + 75//2= 12 + 37= 49(e) 12 * 3 % 5 + 2 * 6//4= 36 % 5 + 2 * 6//4= 1 + 2 * 6//4= 1 + 12 // 4= 1 + 3= 4(f) 12 % 5 * 3 + (2 * 6)//4= 2 * 3 + (2 * 6)//4= 6 + 12 // 4= 6 + 3= 9

Question 7

Question 4Evaluate the above expressions by using IDLE as a calculator and verify the results that you get manually.

Accepted Answer

(a)>>>(2 + 3) ** 3 - 6 / 2
Output122.0
(b)>>>(2 + 3) * 5 // 4 + (4 + 6) / 2
Output11.0
(c)>>>12 + (3 * 4 - 6) / 3
Output14.0
(d)>>>12 + (3 ** 4 - 6) // 2
Output49
(e)>>>12 * 3 % 5 + 2 * 6 // 4
Output4
(f)>>>12 % 5 * 3 + (2 * 6) // 4
Output9

Question 8

Question 5Identify invalid variable names from the following, giving reason for each:Group, if, total marks, S.I., volume, tot_strength, #tag, tag$	ext{	extdollar}$, 9a, for

Accepted Answer

Group — This is a valid variable name.if — This is an invalid variable name because if is a reserved keyword in Python and cannot be used as a variable name.total marks — This is an invalid variable name because it contains a space, which is not allowed in variable names. A variable name must be a single continuous string without spaces.S.I. — This is an invalid variable name because it contains full stops, which are not allowed in variable names. Variable names can only include letters, digits, and underscores.volume — This is a valid variable name.tot_strength — This is a valid variable name.#tag — This is an invalid variable name because it starts with a hash symbol (#), which is not allowed in variable names. Variable names must start with a letter or underscore.tag$	ext{	extdollar}$ — This is an invalid variable name because it contains a dollar sign ($	ext{	extdollar}$), which is not allowed in variable names. Variable names can only include letters, digits, and underscores.9a — This is an invalid variable name because it starts with a digit, which is not allowed in variable names. Variable names must start with a letter or underscore.for — This is an invalid variable name because for is a reserved keyword in Python and cannot be used as a variable name.

Question 9

Question 6(a)Find the output of the following code:x=3
y=x+2
x+=y
print(x,y)

Accepted Answer

Output8 5
Explanationx = 3
y = x + 2x is initialized to 3.y is set to x + 2, which means y = 3 + 2 = 5.x += yThe += operator adds the value of y to x and assigns the result back to x.Current values are:x = 3y = 5Calculation: x + y = 3 + 5 = 8Updating x: x += 5 means x = x + 5So, x = 3 + 5 = 8.print(x, y)The final values of the variables are:x = 8y = 5Hence, the output of the program is:8 5

Question 10

Question 6(b)Find the output of the following code:x=-2
y=2
x+=y
y-=x
print (x,y)

Accepted Answer

Output0 2
Explanationx += yThe += operator adds the value of y to x and assigns the result back to x.Current values are:x = -2y = 2Calculation: x + y = -2 + 2 = 0Updating x: x += 2 means x = x + 2So, x = -2 + 2 = 0.y -= xThe -= operator subtracts the value of x from y and assigns the result back to y.Current values are:x = 0y = 2Calculation: y - x = 2 - 0 = 2Updating y: y -= 0 means y = y - 0So, y = 2 - 0 = 2.print(x, y)The final values of the variables are:x = 0y = 2Hence, the output of the program is:0 2

Question 11

Question 6(c)Find the output of the following code:a=5       
b=2*a         
a+=a+b        
b*=a+b        
print (a,b)

Accepted Answer

Output20 300
Explanationa = 5
b = 2 * aa is initialized to 5.b is set to 2 * a, which means b = 2 * 5 = 10.a += a + bThe += operator adds the value on the right to a and assigns the result back to a.Current values are:a = 5b = 10Calculation: a + b = 5 + 10 = 15Updating a: a += 15 means a = a + 15So, a = 5 + 15 = 20.b *= a + bThe *= operator multiplies b by the value on the right and assigns the result back to b.Current values are:a = 20b = 10Calculation: a + b = 20 + 10 = 30Updating b: b *= 30 means b = b * 30So, b = 10 * 30 = 300.print(a, b)The final values of the variables are:a = 20b = 300Hence, the output of the program is:20 300

Question 12

Question 6(d)Find the output of the following code:p=10
q=20
p*=q/3
q+=p+q*2
print (p,q)

Accepted Answer

Output66.66666666666667 126.66666666666667
Explanationp *= q / 3The *= operator multiplies p by the value on the right and assigns it to p again.First, compute the division: q / 3 = 20 / 3 ≈ 6.6667p *= 6.6667 means p = p * 6.6667So, p = 10 * 6.6667 = 66.6667q += p + q * 2The += operator adds the value on the right to q and assigns it to q again.First, compute q * 2 = 20 * 2 = 40Then add values: p + q * 2 = 66.6667 + 40Finally, add it to q: q += 106.6667 means q = q + 106.6667So, q = 20 + 106.6667 = 126.6667print(p, q)The variables now have these final values:p = 66.6667q = 126.6667The precision difference is due to floating-point arithmetic. For simplicity of explanation we have taken lesser precision values.

Question 13

Question 6(e)Find the output of the following code:p = 5 % 2
q = p ** 4
r = p // q
p+= p + q + r
r+= p + q + r
q-= p + q * r
print(p, q, r)

Accepted Answer

Output4 -10 7
Explanationp = 5 % 2The modulo % operator calculates the remainder of the division.5 % 2 = 1Thus, p = 1q = p ** 4The exponent ** operator raises p to the power of 4.1 ** 4 = 1Thus, q = 1r = p // qThe floor division // operator divides and returns the integer quotient of the division.1 // 1 = 1Thus, r = 1p += p + q + rThe += operator adds the value on the right to the variable and assigns it to the variable again.Initially, p = 1Calculation inside the parentheses: (p + q + r) = 1 + 1 + 1 = 3p += 3 means p = p + 3So, p = 1 + 3 = 4r += p + q + rThe += operator adds the value on the right to the variable and assigns it to the variable again.Initially, r = 1Calculation inside the parentheses: (p + q + r) = 4 + 1 + 1 = 6r += 6 means r = r + 6So, r = 1 + 6 = 7q -= p + q * rThe -= operator subtracts the value on the right from the variable and assigns it to the variable again.Initially, q = 1Calculation inside the parentheses: (p + q * r) = 4 + 1 * 7 = 4 + 7 = 11q -= 11 means q = q - 11So, q = 1 - 11 = -10print(p, q, r)The variables now have these final values:p = 4q = -10r = 7Hence, the output of the program is:4 -10 7

Question 14

Question 6(f)Find the output of the following code:p = 21 // 5
q = p % 4
r = p * q
p+= p + q - r
r*= p - q + r
q+= p + q
print(p, q, r)

Accepted Answer

Output8 8 0
Explanationp = 21 // 5The floor division // operator divides and returns the integer quotient of the division.( 21 // 5 = 4 )Thus, ( p = 4 )q = p % 4Here, the modulo % operator calculates the remainder of the division.( p % 4 = 4 % 4 = 0 )Thus, ( q = 0 )r = p * qNow it performs a multiplication.p x q = 4 x 0 = 0Thus, r = 0p += p + q - rThe += operator adds the value on the right to the variable and assigns it to the variable again.Initially, ( p = 4 )Calculation inside the parentheses: ( p + q - r = 4 + 0 - 0 = 4 )p += 4 means p = p + 4So, p = 4 + 4 = 8r *= p - q + rThe *= operator multiplies the variable by the value on the right and assigns it to the variable again.Initially, ( r = 0 )Calculation inside the parentheses: ( p - q + r = 8 - 0 + 0 = 8 )r *= 8 means r = r x 8So, r = 0 x 8 = 0q += p + qThe += operator adds the value on the right to the variable and assigns it to the variable again.Initially, q = 0Calculation inside the parentheses: p + q = 8 + 0 = 8q += 8 means q = q + 8So, q = 0 + 8 = 8print(p, q, r)The variables now have these final values:p = 8q = 8r = 0Hence, the output of the program is:8 8 0

Question 15

Question 7Write Python expressions equivalent to the following arithmetic/algebraic expressions:(a) a+b2\dfrac{a + b}{2}2a+b​(b) 32+932\dfrac{3^2 + 9^3}{2}232+93​(c) 32+9353^2 + \dfrac{9^3}{5}32+593​(d) a+a+2b\sqrt{a} + \dfrac{a + 2}{b}a​+ba+2​(e) 8−6+6∗sum7−var8 - 6 + \dfrac{6 * 	ext{sum}}{7} - \sqrt{	ext{var}}8−6+76∗sum​−var​(f) ut+12at2ut + \dfrac{1}{2} at^2ut+21​at2 (u, a, t are variables)

Accepted Answer

(a) (a + b) / 2(b) (3**2 + 9**3) / 2(c) 3**2 + 9**3 / 5(d) a**0.5 + (a + 2) / b(e) 8 - 6 + 6 * sum / 7 - var**0.5(f) u * t + 1 / 2 * a * t**2

Question 16

Question 8Write Python expressions to represent the following situations:(a) Add remainder of 8/3 to the product of 8 and 3.(b) Find the square root of the sum of 8 and 43.(c) Find the sum of the square roots of 8 and 43.(d) Find the integral part of the quotient when 100 is divided by 32.

Accepted Answer

(a) 8 * 3 + 8 % 3(b) (8 + 43)**(1/2)(c) 8**(1/2) + 43**(1/2)(d) 100//32

Source: This question is from Python Programming Fundamentals, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Python Programming Fundamentals: Question, Python, Expressions, Represent, Situations, Add. 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.
Related Questions from Python Programming FundamentalsQ1: Question 1 Write a Python command/instruction/statement to display your name.
Q10: Question 6(e) Find the output of the following code: p = 5 % 2 q = p ** 4 r = p // q p+= p + q + r...
Q11: Question 6(f) Find the output of the following code: p = 21 // 5 q = p % 4 r = p * q p+= p + q - r...
Q12: Question 7 Write Python expressions equivalent to the following arithmetic/algebraic expressions:...
Q14: Question 9 What are operators? Give some examples of unary and binary operators.
Practice more questions from Python Programming Fundamentals &mdash; Computer Science, Class 11 CBSE

Question 17

Question 9What are operators? Give some examples of unary and binary operators.

Accepted Answer

Operators are tokens that trigger some computation/action when applied to variables and other objects in an expression. Unary plus (+), Unary minus (-) are a few examples of unary operators. Examples of binary operators are Addition (+), Subtraction (-), Multiplication (*), Division (/).

Question 18

Question 13What is 'Dynamic Typing' feature in Python?

Accepted Answer

A variable pointing to a value of a certain type can be made to point to a value/object of different type.This is called Dynamic Typing. For example:x = 10
print(x)
x = "Hello World"
print(x)

Question 19

Question 14Write a function called calculate_area() that takes base and height as an input argument and returns an area of a triangle as an output. The formula used is:Area of a Triangle = ½*base*heightSolutiondef calculate_area(base, height):
    area = (1/2) * base * height
    return area

base_value = int(input("Enter the base value: "))
height_value = int(input("Enter the height value: "))
triangle_area = calculate_area(base_value, height_value)
print("Area of the triangle:", triangle_area)OutputEnter the base value: 10
Enter the height value: 5
Area of the triangle: 25.0

Accepted Answer

defcalculate_area(base,height):area=(1/2)*base*heightreturnareabase_value=int(input("Enter the base value: "))height_value=int(input("Enter the height value: "))triangle_area=calculate_area(base_value,height_value)print("Area of the triangle:",triangle_area)OutputEnter the base value: 10Enter the height value: 5Area of the triangle: 25.0

Question 20

Question 15Modify the above function to take a third parameter called shape type. Shape type should be either triangle or rectangle. Based on the shape, it should calculate the area. Formula used:Area of a Rectangle = length * width.Solutiondef calculate_area(base, height, shape_type):
    if shape_type == "triangle":
        area = (1/2) * base * height
    elif shape_type == "rectangle":
        area = base * height
    else:
        area = None
        print("Invalid shape type. Please specify either 'triangle' or 'rectangle'.")
    return area

shape_type = input("Enter the shape type, triangle or rectangle: ")
base_value = int(input("Enter the base value: "))
height_value = int(input("Enter the height value: "))
area = calculate_area(base_value, height_value, shape_type)
print("Area of the", shape_type, "is ", area)OutputEnter the shape type, triangle or rectangle: triangle
Enter the base value: 10
Enter the height value: 5
Area of the triangle is  25.0

Enter the shape type, triangle or rectangle: rectangle
Enter the base value: 8
Enter the height value: 9
Area of the rectangle is  72

Accepted Answer

defcalculate_area(base,height,shape_type):ifshape_type=="triangle":area=(1/2)*base*heightelifshape_type=="rectangle":area=base*heightelse:area=Noneprint("Invalid shape type. Please specify either 'triangle' or 'rectangle'.")returnareashape_type=input("Enter the shape type, triangle or rectangle: ")base_value=int(input("Enter the base value: "))height_value=int(input("Enter the height value: "))area=calculate_area(base_value,height_value,shape_type)print("Area of the",shape_type,"is ",area)OutputEnter the shape type, triangle or rectangle: triangleEnter the base value: 10Enter the height value: 5Area of the triangle is  25.0Enter the shape type, triangle or rectangle: rectangleEnter the base value: 8Enter the height value: 9Area of the rectangle is  72

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