Information Technology
Class-9
Unit- III- Chapter-2 Computer System
A. Multiple choice questions:
1. Computer is a/an _____________ device.
a. Electrical b. Electronic c. Mechanical d. All of the above
Answer: Electronic
2. The input unit of a computer:
a. Directs all other units b. Retrieves data from CPU c. Retrieves data from memory d. feeds data to the memory.
Answer: Feeds data to the memory
3. Which one of the following is not a part of system unit?
a. Motherboard b. Buses c. CPU d. ROM
Answer: ROM
4. Which one of the following types of computers uses the concept of parallel processing?
a. Micro computer b. Mini computer c. Supercomputer d. Analog computer
Answer: Supercomputer
5. Which of the following applications does not imply the multimedia?
a. Banking b. Education c. Games d. Communication
Answer: Banking
6. ________ is a part of central processing unit.
a. APU b. ALU c. VDU d. CDROM
Answer: ALU
B. State T for true or F for false:
1. Laptops are more powerful than mainframe computers.
Answer: F
2. Analog computer are used for industry automation.
Answer: T
3. Buses and bays are not part of system unit.
Answer: T
4. Input Unit of a computer may use a keyboard or mouse or both.
Answer: T
5. Computers are used in education but not in communication.
Answer: F
C. Short answer type questions:
1. What is a computer? What are its characteristics?
Answer: Computer is an electronic machine. It takes instructions from user and process them after that it gives result. Result is also called output.
Its characteristics are:
1. Speed.
2. Accuracy
3. Storage capacity
4. Reliability
5. Versatility
2. What are the components of a computer?
Answer: Components of computer are:
1. Input Unit
2. CPU(Central Processing unit)
3. Main memory
4. Output unit
5. Storage unit
3. What is the role of CU in the CPU of a computer?
Answer: CU(Control Unit) directs the flow of information to the CPU and / or memory storage. It controls, which instructions the CPU will do next. Control unit also generates timings and control signals.
4. What are registers? Why are they used in a CPU?
Answer: A register is a single, temporary storage location within the CPU. Registers are used to hold data. instructions, I/O address, or special binary codes. Registers inside the CPU are called general purpose register.
5. What are buses? What are the three different types of buses used in a computer?
Answer: A Computer bus is simply a parallel collection of conductors that carry data and control signals from one unit to another. The three major system buses are: Address bus, Data bus, Control bus.
6. What are the applications of computers? Discuss in brief.
Answer: Some applications of computer are:
1. Educational applications: Computer helps students and teachers. Computers are used as teaching aids.
2. Business applications: Nowadays , billing, reporting, presentations, et. are being done with the help of computer.
3. Multimedia and entertainment applications: Computer are used to play music, watch movies and play games etc.
7. Why are supercomputer powerful and faster than other types of computers?
Answer: Supercomputers are the fastest computers among all the types of computers, because they use multiprocessing technique, in which a given task is broken into a number of tasks, which are processed by different processors independently.
8. Name functional unit of computer system.
Answer: Some functional units of computer are:
1. Input unit(Keyboard, Mouse etc.)
2. Output unit(Monitor, printer etc.)
3. ALU(Arithmetic Logical Unit)
4. MU (Memory Unit)
5. CU(Control Unit)
D. Long answer type questions:
1. Classify computers on the basis of their size, storage, and processing speed.
Answer:
1. Micro Computer: These computers use a microprocessor chip and this is used instead of a CPU. It means that this microprocessor chip works as CPU.
2. Workstations: A workstation is a part of computer network and generally would be expected to have more than a regular desktop PC of most everything, like memory, storage space, and speed.
3. Servers: Servers refers to a specific kind of computer. A servers runs a network of computers.
4. Mini Computers: These are powerful computers. These computers came into existence in 1960s. The minicomputer has become less important since the PC has become so powerful on its own.
5. Mainframe Computer: Mainframe computers are very powerful, general purpose computers having large capacity memory, speed and capabilities than workstations.
6. Supercomputer: These are the most powerful computers. Supercomputers are the fastest computers among all the types of computers, because they use multiprocessing technique, in which a given task is broken into a number of tasks, which are processed by different processors independently.
2. What are the applications of computers in education?
Answer: Educational Applications: Computers help students in any way they need, researching, typing, searching, etc. Teachers use computers as well. They use computers to teach students by presenting animated presentations on different subjects, keep track of grades of students.
Some other uses of computer in education are:
1. A student can test himself/herself online for a particular subject.
2. Student can access and read books or magazine from online library.
3. The internet also facilitates online learning and training to students.
3. How are computers useful for pathologists, doctors and medical students?
Answer: The applications of computer in the medical field, is really a boon to patients and doctors. In a computerized Medicare system, chances of human error are minimized or eliminated.
Pathological tests, scanning and continuous monitoring of body conditions of a patient being operated are done through computerized testing and surgical equipment's.
Computers are widely used in hospitals to support doctors in diagnosis and getting information on patients, diseases, treatments, drugs etc.
Medical students can use virtual reality to learn surgery of a particular organ of a human being. Virtual reality is a concept that creates illusion of the existence of an object, which really does not exist.
4. What are the major components of a computer system? Name the subunits that make up the CPU and give the functions of each of the units.
Answer:
Components of computer are:
1. Input Unit
2. CPU(Central Processing unit)
3. Main memory
4. Output unit
5. Storage unit
Internal Components of computer are:
1. Motherboard: The motherboard is a main circuit board of computer.
2. CPU: The CPU is an electronic chip that determines the processing power of the computer.
3. Memory: Memory is the part of computer that store data.
4. Bus: A bus is an electronic line that carriers data and instructions.
5. Ports or connector: A port is a connector located on the motherboard.
6. Bays: A bay is a space inside the computer case where a hard drive sit.
7. Power supply unit: It changes normal household electricity into electricity that a computer can use.
8. Sound card: A sound card enables a computer to play and record high quality sound.
5. What is a computer? Discuss its main components/units with their functions.
Answer: Computer is an electronic machine. It takes instructions from user and process them after that it gives result. Result is also called output.
Its characteristics are:
Components of computer are:
1. Input Unit: The input unit of a computer system is responsible for accepting data and instructions from the user. Data and instructions are fed to the computer with the help of an input device.
2. CPU(Central Processing unit): CPU is the brain of computer, where all sorts of processing are initiated, carried out and completed. The CPU performs all the mathematical and logical operations and directs the flow of data in a computer.
3. Main memory: Main memory refers to physical memory that is internal to the computer. The word main is used to distinguish if from external mass storage devices such as disk drives. Other terms used to mean main memory include RAM and Primary storage.
4. Output unit: The output unit is formed by the output devices attached to the computer. Output devices are used to present result produced by the computer to the users.
5. Storage unit: This unit is also called memory unit. The data and instructions which are entered through an input unit must be stored on the computer before the actual processing starts.
6. What are the major strengths and weaknesses of computers?
Answer: Strengths of computers:
1. Speed: Computers are fast and powerful machine.
2. Accuracy: Computers can perform all the calculations accurately.
3. Storage capability: A computer can store huge amount of data.
4. Reliability: Computer gives more reliable output than human beings.
5. Versatility: Computers are more versatile than human beings.
Weaknesses of computers:
1. Lack of decision making capability: Computers do not have their own decision making power.
2. Lack of IQ: Computers do not have their own IQ.
3. No Heuristics: Computers do not learn from their past experiences.
4. Bad impacts on Health: Computers may pose physical health risks for children. The most frequently cited are visual strains, harmful effects of radiation, and posture and skeletal problems.
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