CBSE Class XII Informatics Practices Sample Questions
1. A ____________is a device that connects the organisation’s network with the outside world of the Internet. i. Hub ii. Modem iii. Gateway iv. Repeater
2. When e-waste such as electronic circuit boards are burnt for disposal, the elements contained in them create a harmful chemical called ________which causes skin diseases, allergies and an increased risk of lung cancer. i. Hydrogen ii. Beryllium iii. Chlorine iv. Oxygen
3. Copyright, Patent and Trademark comes under: i. Intellectual Property Right ii. Individual Property Right iii. Industrial Property Right iv. International Property Right
4. Predict the output of the following query: SELECT MOD (9,0); i. 0 ii. NULL iii. NaN iv. 9
5. Which of the following SQL functions does not belong to the Math functions category? i. POWER() ii. ROUND() iii. LENGTH() iv. MOD()
6. ________ is not a FOSS tool. i. Libre Office ii. Mozilla Firefox iii. Google Chrome iv. Python
7. CSV stands for: i. Column Separated Value ii. Class Separated Value iii. Comma Separated Value iv. Comma Segregated Value
8. Raj, a Database Administrator, needs to display the average pay of workers from those departments which have more than five employees. He is experiencing a problem while running the following query: SELECT DEPT, AVG(SAL) FROM EMP WHERE COUNT(*) > 5 GROUP BY DEPT; Which of the following is a correct query to perform the given task? i. SELECT DEPT, AVG(SAL) FROM EMP WHERE COUNT(*) > 5 GROUP BY DEPT; ii. SELECT DEPT, AVG(SAL) FROM EMP HAVING COUNT(*) > 5 GROUP BY DEPT; iii. SELECT DEPT, AVG(SAL) FROM EMP GROUP BY DEPT WHERE COUNT(*) > 5; iv. SELECT DEPT, AVG(SAL) FROM EMP GROUP BY DEPT HAVING COUNT(*) > 5;
9. Predict the output of the following query: SELECT LCASE (MONTHNAME (‘2023-03-05’)); i. May ii. March iii. may iv. march
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