CBSE-SOLUTIONS
CLASS-9
PART-A
UNIT-III Information Communication Technology
Chapter- 2: Computer System
1. Computer is a/an ________ device.
(a) Electrical (b) Electronic (c) Mechanical (d) All of the above
Answer: (b) 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: (d) 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: (d) 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: (c) Supercomputer
5. Which of the following applications does not imply the multimedia?
(a) Banking (b) Education (c) Games (d) Communication
Answer: (a) Banking
6. ________ is a part of central processing unit.
(a) APU (b) ALU (c) VDU (d) CDROM
Answer: (b) ALU
B. State 'T' for True or 'F' for False
1. Laptops are more powerful than mainframe computers.
Answer: F
2. Analog computers are used for industry automation.
Answer: F
3. Buses and bays are not part of system unit.
Answer: F
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: A computer is an electronic device that accepts data (input), processes it according to given instructions, produces results (output), and stores data for future use.
Characteristics: Speed, Accuracy, Diligence, Versatility, Storage Capacity, Automation.
2. What are the components of a computer?
Answer: Input Unit, Central Processing Unit (CPU), Memory Unit, Output Unit.
3. What is the role of CU in the CPU of a computer?
Answer: Control Unit (CU) fetches, decodes instructions and generates control signals to coordinate all operations inside the computer.
4. What are registers? Why are they used in a CPU?
Answer: Registers are small, high-speed memory locations inside the CPU used for temporary storage of data and instructions during processing.
5. What are buses? What are the three different types of buses used in a computer? Discuss in brief.
Answer: Buses are communication paths that carry data and signals between components.
Data Bus: Carries data.
Address Bus: Carries memory addresses.
Control Bus: Carries control signals.
6. What are the applications of computers? Discuss in brief.
Answer: Education, Banking, Healthcare, Entertainment, Communication, Business, Scientific Research, etc.
7. Why are supercomputers powerful and faster than other types of computers?
Answer: They use thousands of processors working in parallel, high-speed memory, and advanced architecture for complex calculations.
8. Name Functional Unit of Computer System.
Answer: Input Unit, Output Unit, Memory Unit, ALU, Control Unit.
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