CBSE Class 12 Informatics Practices Sample Paper 2020 (1)

CBSE Class 12 Informatics Practices Sample Paper 2020 (1). It’s always recommended to practice as many sample papers as possible before the examinations. Students can download the sample papers and also question papers of previous years to practice and score better marks in examinations. Refer to other links too for more sample papers.

1. (a) Two doctors have connected their mobile phones to transfer a picture file of a person suffering from a skin disease. What type of network is formed? Which communication media out of Coaxial cable, Optical fiber, Bluetooth, Satellite link should be used to transfer the file ?

(b) State reason why Star topology requires more cable length than Bus topology. 

(c) “Open Source Software developers work for the good of community”. Is this statement true? Give reason.

(d) What happens during ‘Domain Name Resolution’? 

(e) How is ‘Denial of service’ attack, a threat to Network security? 

2. (a) Identify the odd one out of the following statements. State reason for your choice. 

(i) switch (ii) do while (iii) while (iv) for

(b) What is the difference between setVisible() and setEnabled() methods? 

(c) What is the difference between the following statements (i) and (ii)? 

i a=5;

ii if(a = = 5)

x=3;

(d) Write the output in jTextField1 if depcode is 3.

switch (depcode)

{ case 1 : allowance=4000;

break;

case 2 : allowance=3200;

break;

default : allowance=1000;

}

jTextFieldl.setText( " " +allowance);

(e) Sandhya is creating a webpage. She is entering HTML code on her computer. In between, she keeps pressing ‘Refresh’ / ‘Reload’ button on her browser. What is the purpose?

(f) What does ‘XML’ stand for? How is the purpose of HTML different from XML? 

(g) Write Java code (statements) to declare Y as integer variable. Then, assign the value 30 to a variable Y. Increase the value of Y by 5 and store the increased value in Z.

3. (a) What is MySQL? 

(b) Charvi is inserting “Sharma” in the “LastName” column of the “Emp” table but an error is being displayed. Write the correct SQL statement.

INSERT INTO Emp(‘Sharma’)VALUES(LastName) ;

(c) Kunal created the following table with the name ‘Friends’ : 

Please click the link below to download CBSE Class 12 Informatics Practices Sample Paper 2020 (1).

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