Consider the procedure given below. 1 Procedure eliminate(L1, L2) 2 L3 = [], Found = False 3 foreach i in L1{ 4 foreach j in L2{ 5 if(i == j){ 6 Found == True 7 } 8 } 9 if(not Found){ 10 L3 = L3 ++ [i] 11 } 12 Found = False 13 } 14 return(L3) 15 End eliminate If L1 and L2 are two lists, and L = eliminate(L1, L2), choose the correct option.

(A) L contains all the elements of L2 that are not present in L1

(B) L contains all the elements of L1 that are not present in L2

(C) L contains all the elements common to L1 and L2

(D) L contains the unique elements present in L1 or L2

Consider the following pseudocode: 1 aList = [2, 6, 7, 2, 8, 7, 6, 2, 3] 2 bDict = {} 3 bList = [] 4 foreach a in aList{ 5 if(not isKey(bDict, a)){ 6 bDict[a] = True 7 bList = [a] ++ bList 8 } 9 } At the end of execution of the pseudocode, which of the following is correct?

(D) bList = [2, 6, 7, 2, 8, 7, 6, 2, 3]

Computational Thinking Quiz 2: 23 November 2025 (September 2025 term)

Question 1

+4 marksOne correct option

Consider the procedure given below.

text

1 1  Procedure eliminate(L1, L2)
2 2      L3 = [], Found = False
3 3      foreach i in L1{
4 4          foreach j in L2{
5 5              if(i == j){
6 6                  Found == True
7 7              }
8 8          }
9 9          if(not Found){
1010              L3 = L3 ++ [i]
1111          }
1212          Found = False
1313      }
1414      return(L3)
1515  End eliminate

If L1 and L2 are two lists, and L = eliminate(L1, L2), choose the correct option.

A
L contains all the elements of L2 that are not present in L1
B
L contains all the elements of L1 that are not present in L2
C
L contains all the elements common to L1 and L2
D
L contains the unique elements present in L1 or L2

Question 2

+4 marksOne correct option

Consider the following pseudocode:

text

11  aList = [2, 6, 7, 2, 8, 7, 6, 2, 3]
22  bDict = {}
33  bList = []
44  foreach a in aList{
55      if(not isKey(bDict, a)){
66          bDict[a] = True
77          bList = [a] ++ bList
88      }
99  }

At the end of execution of the pseudocode, which of the following is correct?

A
bList = [2, 6, 7, 8, 3]
B
bList = [3, 8, 7, 6, 2]
C
bList = [28]
D
bList = [2, 6, 7, 2, 8, 7, 6, 2, 3]

Question 3

+4 marksOne or more correct options

The following pseudocode is executed using "Scores" dataset. Let M, P, and C be the lists of the sequence numbers of the students who have scored more than 75 marks in Mathematics, Physics, and Chemistry respectively. At the end of the execution, dict stores a dictionary with the sequence number of student mapped to the number of subjects in which the student has scored more than 75 marks. Choose the correct implementation(s) of nSub.

Select all that apply.

9 more questions in this paper

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More on the Computational Thinking (CT) Quiz 2 23 Nov 2025 paper

The IIT Madras BS Computational Thinking (Computational Thinking (CT)) Quiz 2 paper sat on 23 Nov 2025, in the September 2025 term: 12 questions for 50 marks in 120 minutes. The first 3 questions are below. Sign in with Google — it is free — to see the whole paper with its answers and explanations, in learning mode or as a timed mock test.

Feature	Computational Thinking (CT) Quiz 2 23 Nov 2025 at a glance
Term	September 2025 term
Subject	Computational Thinking
Course code	BSCS1001
Questions	12
Marks	50
Duration	120 min
MCQ	7
MSQ	4
Numerical	1
Official paper	IIT M DIPLOMA AN EXAM QDD2 23 Nov 2025 NEW
Negative marking	No negative marking.
Updated	25 Sept 2026