MINI MOCK (MIMO) Computer Science 2210
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1 MINI MOCK (MIMO) Computer Science 2210 For Class 9th Abstract The Mini Mock examination paper for Final Term
2 INSTRUCTIONS This Mini Mock paper is designed to test your preparation for Final-Term examinations. It contains the same question format as Cambridge International Examinations. The level of difficulty is kept at medium level and it contains critical thinking questions that require you to think out-of-the-box. Some of these questions will test your analytic skill and you need to concentrate on your daily life to find answers. Answers should be logical and clear without any ambiguous statements. The quality of describing and explanation answers should meet a certain standard to be marked fully. Double answers are considered wrong as well as poorly drawn diagrams. All calculations, until and unless told explicitly, should be done in the rough section at the end of this question paper. No calculators are allowed! Time: 1 hour 45 minutes. Max Marks: 100 Total Questions: 9 All questions are compulsory GOOD LUCK STUDENTS! 1 P a g e
3 QUESTION 1 Convert the following binary numbers into denary 1) ) ) [3] Convert the following from hexadecimal to denary 1) 1 A ) D16 3) C 0 D16 [3] Convert the following from denary to binary 1) ) ) [3] Convert the following from binary to hexadecimal 1) ) ) [3] Convert the following from denary to hexadecimal 1) ) ) [3] 2 P a g e
4 QUESTION 2 a) Following are some terminologies related to the use of hexadecimal numbers. Match the terminology with its explanation Memory dump A 48-bit binary number that identifies a device on a network HTML Numeric representation of all characters on a keyboard. MAC address Representation of the contents of memory on screen or as a print out ASCII code Assembly code A language to develop webpages. Color codes are defined as hexadecimal values in it Low level language which can access computer memory directly. [5] b) A MAC address of a computer is written below in denary form. (i) Convert it into hexadecimal 34 : 21 : 48 : 169 : 255 : 72 : : : : : [3] (ii) What are the first 6 digits (hexadecimal digits) of a MAC address represents? [1] (iii) What are th last 6 digits (hexadecimal digits) of a MAC address represents? [1] 3 P a g e
5 QUESTION 3 a) The following flowchart shows how barcodes are used when a customer buys items from the supermarket. Barcodes are used to find the prices and to carry out stock control. Several stages are missing from the flowchart. These stages are shown in the item list below. Insert the correct statements, using numbers only, to complete the flowchart. 4 P a g e
6 b) Two type of barcodes are shown below. A B (i) Name the barcode A [1] (ii) Name the barcode B [1] (iii) Following are the statements that can correspond to either barcode A or B (not both). Put tick mark in the appropriate column to signify which barcode the statement belong to. Statement It is used in commonly used in libraries Can be read by using a special scanner Can store only limited amount of information It is used in libraries It is used for advertising Can store many types of information like website address, contact number, address etc. It is relatively new and isn t very common Can be read by using normal smartphone camera Barcode A Barcode B [8] 5 P a g e
7 QUESTION 4 (a) The following statements describe the process of a speech recognition system when it used to in word processing software to suggest spoken words. Rearrange the following sequence of steps by writing the correct order number in the Sequence Number column. The first one is done for you. Steps The computer breaks the word into phonemes Sequence Number The person speaks the word in a microphone It then compares it with the built-in dictionary 1 The ADC converts the analog data from microphone and forward it to computer If the match is found, then the computer suggest that word in word processor software [4] (b) Explain one weakness of speech recognition system along with a suitable example. [3] 6 P a g e
8 QUESTION 5 Suggest a suitable input or output device for the following uses. i) Entering/Typing financial data into computer [1] ii) Printing lots of documents in fast speed [1] iii) Automatic data entry of books in a library [1] iv) Creation of prototype of a building [1] v) A common output device that is back-lit by either LED or CCFL. [1] vi) An output device that is very thin, portable and curved [1] vii) A device that is used to convert paper documents into digital format [1] 7 P a g e
9 QUESTION 6 A burglar alarm system is commonly used to prevent robbers and thieves from entering any premises. (a) Complete the following diagram of a burglar alarm system by labeling the four missing components in it. Sensor Microprocessor Actuator [4] (b) Why do we need Digital-to-Analog Converter (DAC) in some sensor systems? [2] (c) Sensor based systems can be categorized into monitoring and control systems. Which of the category does burglar alarm system belong to? Also give the reason of your answer. [3] 8 P a g e
10 QUESTION 7 (a) Match the following statements with the correct file format. It contains only alphanumeric data Lossless compressed file The file is composed of small elements called pixels File size is made smaller by finding repeating data and replacing it with smaller codes It contains multimedia data Audio file Text file Lossy compressed file It contains digital representation of analog sound data Image file The file is compressed by deleting unneeded data MP4 file [6] (b) The following statements refer to either MIDI or MP3 files. Write in the column whether the statement is about MIDI or MP3. It contains musical notes data. Statement MIDI or MP3 Uses lossy file compression to encode sound data It contains the commands for the musical instrument to produce a particular sound File is very compact usually in kilobytes Musical instrument data can be edited/replaced easily It is commonly used to distribute music on internet It is useful for musicians and sound composers Does not retain the actual quality of the sound [4] 9 P a g e
11 QUESTION 8 (a) A cellphone contains both RAM (Random Access Memory) and ROM (Read Only Memory). Explain why both of these memories are needed for the working of a cell phone. RAM (Random Access Memory) [2] ROM (Read-Only Memory) [2] (b) Categorize the following storage devices into primary, secondary or offline storage by putting a tick mark in the respective column Compact Disk (CD) Device Primary Secondary Offline Hard Disk (HDD) Static RAM (SRAM) Blu-ray Disk (BD) Solid State Disk (SSD) Read-Only Memory (ROM) Digital Versatile Disk (DVD) Dynamic RAM (DRAM) [4] 10 P a g e
12 (c) For the devices given in part (b), put a tick mark to signify which storage technology each device uses. Compact Disk (CD) Device Magnetic Solid State Optical Hard Disk (HDD) Static RAM (SRAM) Blu-ray Disk (BD) Solid State Disk (SSD) Read-Only Memory (ROM) Digital Versatile Disk (DVD) Dynamic RAM (DRAM) [4] (d) Write down four advantages of using SSD as compare to HDD. i) ii) iii) iv) [4] 11 P a g e
13 QUESTION 9 (a) An image is 300 pixels by 500 pixels. Calculate: (i) the total number of pixels in the original image [1] (ii) the number of bytes occupied by this file [2] (iii) the file size of the jpeg image (in kilobytes) if the original image was reduced by a factor of 8. [2] 12 P a g e
14 (b) Estimate the size of a file for each of the following: (i) Text file containing 641 characters. [1] (ii) Word processor document containing 680 characters and a small image which is 20x40 pixels in size. [1] (iii) A database is to contain a person s name and their address. Decide the maximum number of characters you would need to input a name and an address. Estimate the maximum size of file needed to store the name and address. [2] (iv) A security system contains a password (8 characters long), a username (35 characters long), a small photo (100 x 100 pixels in size) and a security question (up to 150 characters long). Estimate the file size needed to store all this data. [2] 13 P a g e
15 ROUGH WORK Do all your rough work here 14 P a g e
16 FEEDBACK Please answer the following questions to make this MiMo more effective. 1. Was this MiMo too difficult? 2. Were the questions clear and easy to understand? If not, then state unclear question numbers. 3. Do you agree that this MiMo serves its purpose by highlighting your weak areas? 4. Do you want to attempt more MiMo like this in future? 5. Do you have any suggestions through which I can improve this MiMo? 15 P a g e
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