7/28/2019 DO Computer Paper 2011

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COMPUTER STUDIESClass IX

Science GroupTime 3:00 hours Max Marks 75

General instructions:

Section A: It consists of 15 Multiple Choice Questions (MCQs) and all of them are to be answered.Section B: It consists of 13 Short-Answer Questions of which 09 questions are to be answered.Section C: It consists of 03 Descriptive-Answer Questions of which 02 questions are to be answered.

SECTION A MCQs (Multiple Choice Questions) (15 Marks)

Note: Attempt all questions from this section.Q.No.1 Choose the correct answer for each from the given options.

i) A port which transmits more than one bits of information at a time is called _______.a) Serial Port b) Parallel Port c) Both Serial & Parallel d) None of them

ii) Printer resolution is usually measured in _____.

a) Data per inch b) Bytes per inch c) Characters per inch d) Dots per inch

iii) There are _____ basic registers shared by ALU and CU.a) 14 b) 8 c) 65 d) None of them

iv) ______ is a pre-programmed memory.a) SRAM b) DRAM c) SIMM / DIMM d) None of them

v) LBA stands for _____________.a) Logical Block Area b) Logical Block Address c) Logical Buffer Area d) None of them

vi) Smallest unit of memory is _____.a) Bit b) Byte c) Nibble d) Word

vii) LCD stands for ______ ______ ______.a) Light Code Digit b) Liquid Crystal Display c) Liquid Color Display d) List Code Digit

viii) Non-volatile memory is _______.a) ROM b) Cache Memory c) RAM d) All of them

ix) An eight bits sequence is called aa) Word b) Cell c) Nibble d) Byte

x) The number, which has a decimal point, is called ______.a) Fixed point b) Character c) String d) Integer

xi) A 4-variable K-Map hasa) 2 cells b) 16 cells c) 4 cells d) 8 cells

xii) The Boolean expression A+B+C is aa) Product term b) Literal term c) Sum term d) Always 1

xiii) The option that makes it easier for people with disabilities to operate a computer is _______.a) Display b) Accessibility c) Fonts d) None of them

xiv) The Bar, displayed at the bottom of the desktop is called _____.a) Tool bar b) Menu bar c) Title bar d) Task bar

xv) The device that enables the computer to make a dial-up networking is ______.

a) Mouse b) Microphone c) Modem d) Monitor

7/28/2019 DO Computer Paper 2011

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SECTION B (Short Answer Questions) (36 Marks)Note: Answer any nine question from this section, all question carry equal marks.Q.No.2 i) What are the characteristics of the 3rd generation of computer?

ii) Draw the Computer Generation Table.iii) What is Monitor?iv) Describe Computer Bus. What are the purpose of Address bus, Data bus and Control bus?v) Define Boolean algebra?vi) Define ports and describe its types.vii) Prove the following Boolean algebraic rules with the help of truth table.

A+A.B = A (ii) A+A.B = A+Bviii) Solve the following numbers:

(110101)2 = (?)10(280)10 = (?)2(600)8 = (?)10(450)10 = (?)8

ix) Solve the following binary numbers:101012 + 101101121111012 - 011011210102 x 1102

11002 1002x) Use a Karnaugh Map to simplifying the following expressions.AB + BC + ACAB + A

xi) What is an Operating System?xii) Describe Keyboard.xiii) What do you know about Windows Explorer?

SECTION C (Detailed Answer Questions) (24 Marks)Note: Answer any two questions from this section. All question carry equal marks.Q.No.3 a) Define and draw a block diagram of CPU with its two major parts ALU & CU.

b) Describe Mainframe, Mini and Micro computes.

Q.No.4 a) Define Printer and its types also describe its examples at least two.b) Define Scanner and describe its types.Q.No.5 a) Define De Morgans theorem and prove the following:

(i) A.B = A+B (ii) A+B = A.Bb) What is Number System? Explain the different types of number system.