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24th April 2018, 01:48 PM
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Re: BCA Solved Assignment Of IGNOU-14

I am pursuing BCA Course from IGNOU University. I have to make an assignment. So do you know from where I can download solved assignment of IGNOU University for BCA Course?
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24th April 2018, 01:50 PM
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Join Date: Aug 2012
Re: BCA Solved Assignment Of IGNOU-14

As you are looking for solved assignment of BCA 1st Semester Course of IGNOU University, so here I am providing solved assignment of BCA 1st Semester Course:

IGNOU University BCA 1st SEM Solved Assignment:

1. A computer program consists of instructions and data on which the instruction operates. How are the instructions of a program executed by a computer? Where are the instructions and data stored during execution? What is the role played by Input/output devices?

Ans. A computer program is a collection of instructions that performs a specific task when executed by a computer. A computer requires programs to function and typically executes the program's instructions in a central processing unit.
A computer program is usually written by a computer programmer in a programming language. From the program in its human-readable form of source code, a compiler can derive machine code a form consisting of instructions that the computer can directly execute. Alternatively, a computer program may be executed with the aid of an interpreter. A part of a computer program that performs a well-defined task is known as an algorithm. A collection of computer programs, libraries, and related data are referred to as software. Computer programs may be categorized along functional lines, such as application software or system software.

The following is a summary of the six steps used to execute a single instruction.
1. Step 1: Fetch instruction.
2. Step 2: Decode instruction and Fetch Operands.
3. Step 3: Perform ALU operation.
4. Step 4: Access memory
5. Step 5: Write back result to register file
6. Step 6: Update the PC.

The instructions and data stored during execution
The Central Processing Unit:
(CPU),
Buses,
Ports and controllers,
ROM;

Main Memory (RAM);
Input Devices;
Output Devices;
Secondary Storage;
floppy disks,
hard disk,
CD-ROM

Inside The Computer
Memory is also known as primary storage, primary memory, main storage, internal storage, main memory, and RAM (Random Access Memory); people in computer circles use all of these terms interchangeably. Memory is the part of the computer that holds data and instructions for processing. Although closely associated with the central processing unit, memory is separate from it. Memory stores program instructions or data for only as long as the program they pertain to is in operation. Keeping these items in memory when the program is not running is not feasible for three reasons:
Most types of memory only store items while the computer is turned on; data is destroyed when the machine is turned off.
If more than one program is running at once (often the case on large computers and sometimes on small computers), a single program cannot lay exclusive claim to memory.
There may not be room in memory to hold the processed data.

2. Computer systems always have small RAM, yet it mostly has a large secondary memory like hard disk? Why? The access time of a hard disk is much larger than RAM, even than RAM is smaller in size than hard disk. Justify.
Ans. Hard Disk
Hard Disk is a drive, which provides you to store your data for a long time. All your personal data like music, images, videos and files are saved by hard disk. Its basic measuring units are Gigabytes (GB) and Terabytes (TB). You can uninstall and save new data according to your demand. In case of more storage requirement, you can use external hard disk drive as well. Seagate, Toshiba and Western Digital are largest manufacturers of internal hard disk while external hard disk are largely manufactured by ADATA, Freecom, LG, Samsung and Toshiba.

RAM is the acronym of Random Access Memory, which is used for storage of computer data, not your personal data. This device is used to read and write data. It temporary stores the computer memory and keep it until system is on and will erased it after your system go shutdown. RAM has two types SRAM (static RAM) and DRAM (dynamic RAM). It is available from 256MB to 8GB sizes. With increase in RAM size system will be able to perform faster than before.

Key Differences(RAM Faster then Hard Disk)
All data you stored on hard disk are permanently saved during usage and after shutdown. While RAM keeps memory until system is running. All the memory will be erased automatically after your system switched off.
Currently, RAM are available from 256MB to 8GB (recently announced by Seagate). While hard disk size starts where RAM size ends. 10GB to 8TB size hard disk are available in the market.

RAM is just a chip containing some circuits. Hard disk is almost a machine having multiple parts like platters, plastic disc, magnate, writer & reader bar.

If you are running short of hard disk space, you can use external hard disk for your data storage. There is no option for external removable RAM.

How can you calculate the capacity of a Winchester disk given its density and speed? A disk has 10 recording surfaces. Each surface has 2000 tracks, each track has 512 sectors and each sector can store 1MB of data. Calculate the capacity of this disk.

3. How can you calculate the capacity of a Winchester disk given its density and speed? A disk has 10 recording surfaces. Each surface has 2000 tracks, each track has 512 sectors and each sector can store 1MB of data. Calculate the capacity of this disk.

Ans: Another term for hard disk drive. The term Winchester comes from an early type of disk drive developed by IBM that had 30 MB of fixed storage and 30MB of removable storage; so its inventors called it a Winchester in honor of its 30/30 rifle. Although modern disk drives are faster and hold more data, the basic technology is the same, so Winchester has become synonymous with hard.

OR
A type of disk storage device characterized by non removable or sealed disk packs; extremely narrow tracks; a lubricated surface that allows the head to rest on the surface during start and stop operations; and servo mechanisms which utilize a magnetic pattern, recorded on the medium itself, to position the head.

(i) Parallel port versus Serial port
The main difference between a serial port and a parallel port is that a serial port transmits data one bit after another, while a parallel port transmits all 8 bits of a byte in parallel.

Thus a parallel port transmits data much faster than a serial port. Computers have both serial and parallel ports along with newer technology called a USB (Universal Serial Bus) port.

Pin Configuration of Ports
Serial ports typically are 9 pin or 25 pin male connectors. The parallel port is a 25 pin female connector where the printer cable connects. The ports COM1 and COM2 on your computer are serial ports and the LPT1 port is a parallel port. Each pin has a specific function such as transmit data, receive data, data terminal ready or autofeed. Serial ports also refer to any port that is RS232 (Recommended Standard 232) compliant in the telecommunications world.

Devices That Use Serial Ports
The RS232 standard is used by many different manufacturers of devices. Some common devices that use the serial port connection are flat screen monitors, GPS receivers, bar code scanners and satellite phones or modems.

Devices That Use Parallel Ports
The parallel port is virtually synonymous with being a printer port. Other devices that communicate with a parallel port are zip drives, scanners, joysticks, external hard drives and webcams. Today, the parallel port has been replaced by the new USB port for connecting these same devices to the computer.

Light Pen versus Touch Screen
A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with the computer's CRT monitor. It allows the user to point to displayed objects, or draw on the screen, in a similar way to a touch screen but with greater positional accuracy. A light pen can work with any CRT-based monitor, but not with LCD screens, projectors or other display devices.


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