Class-IV Solved Exercise:
Chapter-2 Working of Computer
1. Tick the correct option.
1. Keyboard is an:
i. input device ii. output device iii. storage device iv. processing device
Answer: Input device
2. This device used to copy the document to the computer:
i. printer ii. scanner iii. mouse iv. OMR
Answer: Scanner
3. Speakers are:
i. input device ii. output device iii. processing device iv. storage device
Answer: Output device
4. It accepts the input from the mark made by the pencil or pen:
i. scanner ii. OMR iii. OCR iv. MICR
Answer: OCR
5. This device is used to give high quality graphical outputs:
i. scanner ii. printer iii. plotter iv. dot matrix
Answer: Plotter.
2. Tick the correct statement as T and wrong statement as F.
1. The computer processes the data to provide information. T
2. A mouse allows you to move your finger across a pressure sensitive pad and press it to click. f
3. A microphone is a device which allows you to record voices or sounds. T
4. The full form of RAM is Radio Access Memory. F
5. RAM is a temporary memory. T
6. ALU does all the calculations, comparisons and decision making. T
7. CU contols the flow of information. T
8. CPU and other components are attached to the motherboard. T
9. Laser printers use a dry powder called toner to print. T
10. Software is a program or set of programs that tell a computer what to do. T
11. Hardware is made up of bricks. F
12. The paint program is an example of computer hardware. F
3. Fill in the blanks:
1. __________ is the collection of facts and details which are unorganized.
Answer: Data
2. ___________ is the sequence of instructions given to a computer to change data into information.
Answer: Processing
3. On a __________ you touch the screen to execute the commands.
Answer: Touch screen
4. A digital camera records pictures in the _______ form.
Answer: Digital
5. The _________ is the processing device which does all the calculations, comparisons and decision making in the CPU.
Answer: ALU
6. The ____________ and ___________ are components of a CPU.
Answer: CPU, CU
7. The ____________ printers use a black ribbon to print.
Answer: Dot matrix
8. _____________ is the term used to refer to the physical components of a computer.
Answer: Hardware
9. _______ is the memory which holds the data programs, results while you are working on the computer.
Answer: RAM
10. The dry ink (toner) is used in a __________ printer.
Answer: Laser
4. Answer the following questions:
1. Define a computer.
Answer: Computer is an electronic machine which can calculate large calculations in a short period.
It can store large amount of data in the memory.
2. What is a data?
Answer: Data is the collection of facts and details which are unorganized.
3. Write about the memory of a computer.
Answer: The memory of computer is made up of CHIPS. The main working memory of a computer is called the Random Access Memory (RAM). It holds data and calculates results.
4. Name any four input devices and any three output device.
Answer:
Input devices:
1. Keyboard
2. Mouse
3. Scanner
4. Touchscreen
Output devices:
1. Printer
2. Monitor
3. Speakers
5. What are the hardware and the Software? Write a few lines on computer hardware and computer software.
Answer:
Hardware: Hardware is any part of a computer system you can see or touch. Some examples of hardware are the keyboard, the CPU, the mouse and the speakers.
Software: Software is a program or a set of programs that tell a computer what to do. Some examples of software are the Paint program or the MS Word program and also the games which you play on the computer.
6. Define:
i. Processing ii. Information
Answer:
i. Processing: Processing is the sequence of instructions given to a machine to change data into information.
ii. Information: Information is the final result which comes after the processing of the data. Information is always useful to a user and is used in decision making.
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