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Akshaya Academy Matric Hr. Sec. School First Mid Term Test Subject: Computer Science Class: XI std Date: 28/07/2014

Max Marks: 50 Time allocated: 90 mins

Answer All The Questions

21 x 1 = 21

1. The word ‘computing’ means ‘an act of __________’ a) Counting b) Calculating c) Processing d) Controlling 2.The Difference Engine was invented by ___________ a) Charles Babbage b) Blaise Pascal c) William Oughtred d) Herman Hollerith 3.The development of Internet was initiated during __________ generation. a) Second b) Third c) Fourth d) Fifth 4. ________ is an act of defining a problem, understanding the problem and arriving at workable solutions. a) Programming b) Computing c) Performing d) Problem Solving 5.The __________ supports the computer for specific tasks like file copying, sorting, linking an object program etc. a) Word Processing b) Utility Program c)Application Software d) Operating System 6.The object program is in the form of __________ a) Binary b) Source Code c) Assembly Language d) Algorithm 7.Application softwares are controlled by __________ a) User b) Controller c) System Software d) Hardware 8.Which of the following is not a spreadsheet software? a) Lotus b) Star office Calc c) Excel d) Oracle 9. __________ computers are mainly used for specialized tasks. a) Workstations b) Hybrid c) Personal d) Digital 10. _________computers can process billions of instructions per second. a) Super b) Mainframe c) Mini d) Micro 11.How many values can be represented using 1 byte of memory in binary representation? a) 2 b) 8 c) 256 d) 1024 12.The ASCII value of numeric 0 is a) 0 b) 1 c) 32 d) 48 13.The size of one peta in terms of bytes is __________ a) 2^40 b) 2^50 c) 2^60 d) 2^70 14.The decimal equivalent of 1D16 is __________ a) 1610 b) 2710 c) 2810 d) 2910 15.The hexadecimal equivalent of the binary sequence 100100110112 is __________ a) C9D16 b) 49B16 c) 93616 d) 491116 16.The number 65 should have _______ bits in its binary representation a) 2 b) 7 c) 8 d) 10 2 17.The binary equivalent of is 8 a) 0.1 b) 0.01 c) 0.001 d) 0.0001 18.The representation of -4 using 2’s complement is a) 1100 b) 1011 c) 0100 d) 1110 19.If n bits are used to represent an unsigned integer value, the range is from 0 to a) 2n b) 2n-1 c) 2n-1-1 d) 2n-1 20. _______ is the number in an addition operation to which another number is added. a) Augend b) Addend c) Minuend d) Subtrahend 21.A. A =______ a) 1

b) 0

c) A

d) A

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Answer Any Seven Questions

7 x 2 = 14

22. What is Rotating Wheel Calculator? 23. Distinguish between first generation and second generation computers. 24. Distinguish between data & information. 25. What is an Operating System? Give Examples. 26. Classify the computers based on Principles of operation. 27. Convert 101.012 to decimal. 28. Convert 7710 to binary using Sum of powers of 2 method. 29. Convert 172910 to hexadecimal. 30. Add -1210 and +510 using 4 bit binary system. 31. Convert 7218  ?10 Answer Any Three Questions

3 x 5 = 15

32. Explain briefly about computer hardware and its classifications. 33. Explain about the classifications of micro computers. 34. Write the boolean expression and draw truth table for 2-input of all five boolean operators. 35. Simplify the following boolean expressions a) A B C + A B C + A B C + A B C b) (( AC )  B)  C