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CBSE Class 12 Pre Board 2021 : Computer Science (Kendriya Vidyalaya (KV) No 1, Armapur, Kanpur)

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KENDRIYA VIDYALAYA SANGATHAN Maximum marks: 70 FIRST PRE-BOARD EXAM 2020-21 COMPUTER SCIENCE (083) CLASS-XII SET-1 Duration: 3 Hours General Instructions: 1. 2. 3. a. b. 4. 5. a. b. c. 6. This question paper contains two parts A and B. Each part is compulsory. Both Part A and Part B have choices. Part-A has 2 sections: Section I is short answer questions, to be answered in one word or one line. 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. Part - B is Descriptive Paper. Part- B has three sections Section-I is short answer questions of 2 marks each in which two question internal options have. Section-II is long answer questions of 3 marks each in which two questions have internal options. Section-III is very long answer questions of 5 marks each. All programming questions are to be answered using Python Language only. PART A Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 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. Find the valid identifier(s) from the following: i) 4th Sum ii) Total iii) Numbers&# iv) _Data1 Given the list L=[ Z , X , W , J , G , H ] , write the output of print ( L [-1 : -len(L)-1 : -2] ) Name the Python Library modules which need to be imported to invoke the following functions i) floor() ii) randint() Suppose a tuple T is declared as Tup = (10, AB , 22.2 , 5,3,7), which of the following is incorrect: a. print(Tup[2]) b. print(Tup(1) = 2) c. print(Tup[4] = G ) d. print(max(Tup)) How many types of files can be handled by Python programming? Write a statement in Python to declare a dictionary whose keys are 1, 2, 3 and values are Monday, Tuesday and Wednesday respectively. Write the output of the following code: T = (11,12,13,14,15,16,17) print ( T [-2 : : 1] ) Name the built-in mathematical function / method that is used to return an absolute value of a number. What is the full form of SMTP? Central Computer which is powerful than other computers in the networks is called as ______________. a. Client b. Server c. Hub d. Switch In SQL, name the clause that is used to place conditions on groups in contrast to WHERE clause that places conditions on individual rows. In SQL, what is the use of IS NULL operator? Write any one aggregate function used in SQL. Write any one TCL command? Which topology requires a central computer/controller? Identify the valid data type of SCHOOL out of given options: SCHOOL = 1,2,3,4 a. Integer b. List c. Tuple d. none of these 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

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