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NEB MODEL QUESTION  OF COMPUTER SCIENCE
GRADE : 11
Time : 3hrs          F.M. : 75              P.M : 27
Group A (Long Answer Question)

Attempt ALL the questions. [3 X 10 = 30]

1. What is LAN topology? Write the differences between Star and Bus topology with clean diagram [2+4+4]

2. (a) What is an operating system ? Explain any three function of an operating system. [1 + 6]

(b) The “WiMP” environment is much more user-friendly, why ?
            OR
(a)    What is cell addressing and explain different types of cell addressing used    in spreadsheet. [5]

(b)  What is MS-Word? Write the features of MS-PowerPoint. [1+4]

3. What is a high level programming language? Write an algorithm and flow chart to display the simple interest on the basis of the given rates. The user should accept the value of principal and time from keyboard. [5]

Number of years (time)

Rates (%)

0 to <5

4

5 to <8

7

8 to <12

9

Above 12

11

 

Group B (Short Answer Questions)

Attempt any NINE questions. [9 X 5 = 45]

1. Explain the features of fourth generation of computers. [5]

2. Differentiate between analogue and digital computer, explain with examples. [5]

3. What do you mean by binary number system? Why do digital computers use binary numbers for their operation? [2 + 3]

4. i) Convert these numbers. [5]
(a)    (199)10 = (?)2
(b)   (100011)2 = (?)10
(c)    (508)8 = (?)2

ii) Perform following operations.
(a)   101101 – 1001
(b)    111110 + 1110

5. State the Demorgan’s theorem and verify it. [5]

6. What are logic gates? Construct the truth table of X-NOR operation. [5]

7. Write short notes on (any two) : [5]

(a) Computer Virus      (b) E-commerce     (c) Cyber Law

8. What is internet? Write the differences between e-mail and postal mail. [5]

9. What is mobile computing? Explain the positive and negative impact of social networking sites in our society. [5]

10. What is HTML? Explain the functions of FTP and HTTPS protocols in data communication through the internet. [2 + 3]

11. Explain the uses of computer technology in different fields that makes our daily life easier and faster. [5]




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