Title D.J. Science College - XI Computer Science Prelim Paper.pdf ✅

D.J. Sindh Govt. Science College, Karachi. Preliminary Examination 2024 Computer Science – I For Science Pre-Engineering & Science General Groups Time allowed: 03 hours Maximum Marks: 75 SECTION ‘A’ (MULTIPLE CHOICE QUESTIONS) – (M.C.Qs.) Time allowed: 20 minutes (Marks : 15) NOTE: (i). This section consists of 15 part questions and all are to be answered. Each question carries one mark. (ii). The correct answer bubble must be filled on OMR sheet (I) A B C D pasted in answer script. (iii). Use only blue / black ball point pen or pointer on OMR sheet. (iv). Avoid using pencil / White-o pen on OMR sheet. (v). All notations are used in their usual meanings. The use of Scientific Calculator is allowed. Q. 1. Choose the correct answer for each from the given options. 1. The three topologies associated with LANs are _________ a) Mesh, Tree and Bus topology b) Tree, Circular and Ring topology c) Bus, Ring and Star topology d) Hybrid, Mesh and Star topology 2. A pseudo topology that combines a Star topology with either Ring or Bus topology is known as ___________ a) Router b) Hub c) Ethernet d) Switches 3. The two types of LAN deployed are __________ and ___________ a) Mesh based, Bus based b) Hybrid based, Star based c) Bus based, Ring based d) Ring based, Tree based 4. Bus Architecture is implemented in LANs using ________ a) Address Resolution Protocol (ARP) b) Hypertext Transfer Protocol (HTTP) c) File Transfer Protocol (FTP) d) Ethernet Protocol 5. The diagram given below represents ___________ a) Fully connected topology b) Mesh topology c) Star topology d) Hybrid topology
6. The physical layer concerns with a) process to process delivery b) bit-by-bit delivery c) application to application delivery d) none of the mentioned bit-by-bit delivery 7. Wireless transmission can be done via a) microwaves b) radio waves c) infrared d) all of the mentioned 8. Which device converts human-understandable data and programs into a form that computers can understand and process? a) Output b) Monitor c) Input d) All of the above 9. Which of the following groups are only input devices? a) Mouse, keyboard, monitor, Joystick b) Mouse, keyboard, printer, Light pen c) Mouse, keyboard, Scanner, Joystick, Light pen d) Mouse, keyboard, Trackball, Touch Screen, Microphone e) Both c and d 10. The number of function keys in a keyboard is a) 14 b) 12 c) 13 d) 15 11. The contents written in .............. requires continuous power supply to retain it into the memory. a) RAM b) ROM c) Hard Disk d) Pen Drive 12. DRAM stands for a) Drum Read Access Memory b) Dynamic Random Access Memory c) Disable and Accurate Memory d) None of these 13. What is computer architecture? a) Set of categories and methods that specify the functioning, organisation, and implementation of computer system b) Set of principles and methods that specify the functioning, organisation, and implementation of computer systems c) Set of functions and methods that specify the functioning, organisation, and implementation of computer systems d) None of the above 14. The flash memory modules designed to replace the functioning of a hard disk is ______ a) RIMM b) FIMM c) Flash Drive d) DIMM 15. The most common addressing techniques employed by a CPU is: a) Direct b) Indirect c) Immediate d) All of the above
D.J. Sindh Govt. Science College, Karachi. Preliminary Examination 2024 Computer Science – I For Science Pre-Engineering & Science General Groups Time allowed: 2 hour 40 minutes Maximum Marks: 60 NOTE: Attempt any ten-part questions from this section. All questions carry equal marks. SECTION ‘B’ (SHORT-ANSWER QUESTIONS) (Max. Marks : 30) Q2 .(i) Write down the difference between the hardcopy and softcopy. (ii) Explain client/server model and peer-to peer model. (iii) Give three main objectives of LAN. (iv) Differentiate b/w narrow band, voice band and broadband. (v) Define bit, byte and word. (vi) What is a port? List down its types. (vii) Define Synchronous and Asynchronous transmission method with examples of each transmission. (viii) Differentiate between Analogue and Digital signals. (ix) Write the full form of following abbreviations: (a) NBR (b) SIMM (c) GUI (d)IEEE (e)ASCII (f) ARPANET (x) What is a parity bit? How does the parity bit work in error checking? (xi) Draw the diagram of fetch cycle. (xii) Write down advantages and disadvantages of Magnetic Tape and Disk Storage. (xiii) What is computer security? What security techniques are used to reduce risk? (xiv) How computers can be useful in medical science. (xv) How is a cache memory different from RAM?
SECTION ‘C’ (DETAILED-ANSWER QUESTIONS) (Max. Marks : 30) NOTE: Attempt any Three question from this section. Q3. Explain in detail different types of communication media / channel used in data communication. Q4. What is a computer Register? Define its four types and their functions in detail. Q5. Explain OSI Model with layered diagram. Q6. Give a block diagram of a computer system, showing all its units along with the buses and coprocessor. Q7. What is an input / output device ? Explain any four scanning devices. Q8. Define Topology. Explain star network, ring network and bus network with their relative advantages and disadvantages.