NEW!  CBSE Papers PDF: Class-X, Class-XII

# (Download) CBSE Class-12 Sample Paper 2020-21:Computer Science

Disclaimer: This website is not at associated with CBSE, For official website of CBSE visit - www.cbse.nic.in

## Maximum Marks: 70                                                                                    Time Allowed: 3 hours

General Instructions:

1.  This question paper contains two parts A and B. Each part is compulsory.

2.  Both Part A and Part B have choices.

3.  Part-A has 2 sections:

a.  Section – I is short answer questions, to be answered in one word or one line.

b.  Section – II has two case studies questions. Each case study has 4 case-based sub- parts. An examinee is to attempt any 4 out of the 5 subparts.
4.  Part - B is Descriptive Paper.

5.  Part- B has three sections

a. Section-I is  short answer questions of 2 marks each in which two question have internal options.
b. Section-II is long answer questions of 3 marks each in which two questions have internal options.
c.  Section-III is very long answer questions of 5 marks each in which  one question has internal option.
6.  All programming questions are to be answered using Python Language only

 Question   No. Part-A Marks   allocated Section-I   Select the most appropriate option out of the options given for each question. Attempt any 15 questions from question no 1 to 21. 1 Find the invalid identifier from the following   a)   MyName     b) True    c) 2ndName      d) My_Name 1 2 Given the lists L=[1,3,6,82,5,7,11,92] , write the output of print(L[2:5]) 1 3 Write the full form of CSV. 1 4 Identify the valid arithmetic operator in Python from the following.   a)  ?             b) <            c) **         d) and 1
 5 Suppose a tuple T is declared as T = (10, 12, 43, 39), which of the following is   incorrect?   a) print(T[1])   b) T[2] = -29   c) print(max(T))   d) print(len(T)) 1 6 Write a statement in Python to declare a dictionary whose keys are 1, 2, 3   and values are Monday, Tuesday and Wednesday respectively. 1 7 A tuple is declared as   T = (2,5,6,9,8)   What will be the value of sum(T)? 1 8 Name the built-in mathematical function / method that is used to return an absolute value of a number. 1 9 Name the protocol that is used to send emails. 1 10 Your friend Ranjana complaints that somebody has created a fake profile on   Facebook and defaming her character with abusive comments and pictures. Identify the type of cybercrime for these situations. 1 11 In SQL, name the clause that is used to display the tuples in ascending order   of an attribute. 1 12 In SQL, what is the use of IS NULL operator? 1 13 Write any one aggregate function used in SQL. 1 14 Which of the following is a DDL command?   a)   SELECT   b) ALTER    c) INSERT    d) UPDATE 1 15 Name The transmission media best suitable for connecting to hilly areas. 1 16 Identify the valid declaration of L:   L = [‘Mon’, ‘23’, ‘hello’, ’60.5’] 1