Class 12 Python Revision Tour Mock Test (CBSE)

Topics in Python Revision Tour

• Tokens, variables and data types
• Operators and expressions
• Flow of control
• Strings
• Lists
• Tuples
• Dictionaries
• Mutable and immutable types

Python Revision Tour practice questions with answers

1. Q1Multiple choice·1 mark
   What is the output of the following code? t = 'Computer' print(t[-3:])

   1. (a)uter
   2. (b)omp
   3. (c)mpute
   4. (d)ter
   Show answer and step marks

   1. Correct option: (d) ter+1

   Answer: (d)
2. Q2Multiple choice·1 mark
   Consider the dictionary $d = \{$'pen': 5, 'pencil': 8$\}$. Why does $d$['eraser'] raise an error, while $d$.get('eraser') does not?

   1. (a)The key 'eraser' does not exist, so indexing raises KeyError, whereas get() returns None for a missing key.
   2. (b)get() raises an error for a missing key, whereas indexing returns None for it.
   3. (c)Dictionary keys must be integers, so the string 'eraser' is not allowed for indexing.
   4. (d)print() skips missing keys, so get() displays nothing while indexing displays an error.
   Show answer and step marks

   1. Correct option: (a) The key 'eraser' does not exist, so indexing raises KeyError, whereas get() returns None for a missing key.+1

   Answer: (a)
3. Q3Assertion and reason·1 mark
   Assertion (A): The elements of a list can be changed in place after the list is created. Reason (R): Lists are immutable objects in Python.

   1. (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
   2. (b)Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
   3. (c)Assertion (A) is true but Reason (R) is false.
   4. (d)Assertion (A) is false but Reason (R) is true.
   Show answer and step marks

   1. Correct option: (c) Assertion (A) is true but Reason (R) is false.+1

   Answer: (c)
4. Q4Assertion and reason·1 mark
   Assertion (A): The keys of a dictionary must be unique. Reason (R): A dictionary values can be lists or other containers.

   1. (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
   2. (b)Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
   3. (c)Assertion (A) is true but Reason (R) is false.
   4. (d)Assertion (A) is false but Reason (R) is true.
   Show answer and step marks

   1. Correct option: (b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).+1

   Answer: (b)
5. Q5Short answer·2 marks
   Which one of the following names is a valid Python identifier: 'Total_Marks', '2ndRank', 'for', 'pass-mark'? Give a reason.
   Show answer and step marks

   1. Valid identifier: Total_Marks+1
   2. Reason: '2ndRank' starts with a digit, 'for' is a keyword, and 'pass-mark' contains a hyphen, so each breaks a naming rule+1

   Answer: Total_Marks
6. Q6Long answer·5 marks
   Riya has assigned the following variables in the Python shell: x = 47, y = 5, z = 3, price = 45, qty = 12, discount = 15 and s = "PYTHON". Answer the parts below. (a) State the value of the expression x // y + x % y ** z. [1] (b) State the value of the expression x > 40 and y ** z < 100 or x % 2 ≠ 0. [1] (c) Write one Python expression that gives the amount payable for qty notebooks at price per notebook after the percentage discount is applied. [1] (d) State the value of the expression s[1:4] × 2 + s[-1]. [1] (e) State the value of the expression qty / 5 + qty // 5 ** 2. [1]
   Show answer and step marks

   1. (a) Exponent is evaluated first: $y ** z = 125$; then $x // y = 9$ and $x \% 125 = 47$, so the value is $9 + 47 = 56$.+1
   2. (b) Comparisons first: $x > 40$ is True, $y ** z < 100$ is False, $x \% 2 != 0$ is True; then $(\text{True and False}) \text{ or True}$ gives True.+1
   3. (c) Amount $= \text{price} \times \text{qty} \times (100 - \text{discount}) / 100$, e.g. price × qty × (100 - discount) / 100 (or price × qty - price × qty × discount / 100).+1
   4. (d) $s[1:4] =$ "YTH"; $\times 2$ gives "YTHYTH"; $s[-1] =$ "N"; concatenated value is "YTHYTHN".+1
   5. (e) $5 ** 2 = 25$ is evaluated first, so $12 // 25 = 0$; $qty / 5 = 2.4$; the value is $2.4 + 0 = 2.4$.+1

   Answer: (a) 56; (b) True; (c) price × qty × (100 - discount) / 100, which gives 459.0; (d) "YTHYTHN"; (e) 2.4

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