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CBSE Class 12 Pre Board 2021 : Informatics Practices - Set 3 (CBSE Gulf Sahodaya Qatar Chapter, Doha)

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MODEL EXAMINATION 2020- 21 INFORMATICS PRACTICES - 065 CLASS: XII Time :3 Hrs Max.Marks : 70 General Instructions: i. All questions are compulsory. ii. Answer the questions after carefully reading the text. 1. Given the lists L=[1,3,6,82,5,7,11,92] , write the output of print(L[2:5]) 1 2. Suppose a tuple T is declared as T = (10, 12, 43, 39), which of the following is incorrect? 1 a) print(T[1]) b) T[2] = -29 c) print(max(T)) d) print(len(T)) 3. Write a statement in Python to declare a dictionary whose keys are 1, 2, 3 and values are Monday, Tuesday and Wednesday respectively. 1 4. Identify the correct statement(s) to drop a column from table: a. DELETE COLUMN COLUMN_NAME b. DROP COLUMN COLUMN_NAME c. ALTER TABLE TABLE_NAME DROP COLUMN COLUMN_NAME d. ALTER TABLE TABLE_NAME DROP COLUMN_NAME 1 5. Name the protocol that is used to send emails. 1 6. 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 7. In SQL, what is the use of IS NULL operator? 1 8. Name The transmission media best suitable for connecting to hilly areas. 1 9. If the following code is executed, what will be the output of the following code? 1 name="ComputerSciencewithPython" print(name[3:10]) 10. Which of the following types of table constraints will prevent the entry of duplicate rows? 1 a) Unique b) Distinct c) Primary Key d) NULL 11. By default df.head() will display __________rows from the top. 1 Page 1 of 7

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