29 Questions
What is the result of 45 / 6 when both operands are integers?
7
If you divide 18.0 by 4, what type of number will you get?
A real number
What will be the result of 23 / 4.0?
5.75
Calculate 19.5 / 6.
3.25
What is the result of 22 / 7 when both operands are integers?
3
What type of input device uses a microphone or telephone to convert a person's speech into digital signals?
Speech-Recognition Systems
What type of input device uses a microphone as an input device?
Speech-Recognition Systems
How do Speech-Recognition Systems convert a person's speech into digital signals?
By comparing against 200,000 or more stored patterns
What is an example of an Audio-Input Device?
Microphone
What is an example of a device that captures images?
Digital Camera
What type of input device is used to read bar codes?
Bar-Code Reader
What is an example of a device that uses radio waves to read data?
RFID
What type of device is used to capture images of fingerprints?
Fingerprint Recognition Device
What is the primary function of biometric-input devices?
To measure individual body characteristics
Which of the following biometric characteristics is used to identify a person?
All of the above
What is the purpose of display resolution in output devices?
To determine the number of pixels on a screen
What type of output device is used to print three-dimensional objects?
3D printer
Which of the following is NOT a type of biometric characteristic?
Screen resolution
What is the primary function of fingerprint recognition systems?
To identify individuals through fingerprint patterns
Which of the following biometric-input devices uses voice tone to identify individuals?
Speech-recognition systems
What is the purpose of facial recognition systems?
To identify individuals through facial features
What is the main reason the CPU often waits for information?
The CPU is faster than RAM
What is the primary function of cache?
To provide temporary storage for frequently used instructions and data
What is the relationship between the CPU's speed and RAM's speed?
The CPU is faster than RAM
What type of device is still the major secondary-storage device for desktop/tower computers?
Hard Disks
What is the purpose of a read/write head?
To read and write data to a hard disk
What is the benefit of using cache?
To speed up processing
What is the main difference between the CPU and RAM?
The CPU is used for processing, while RAM is used for storage
What is the primary role of RAM in a computer system?
To store data temporarily
Study Notes
Division Rules
- When both operands in a division expression are integers, the result is an integer, and the fractional portion is discarded.
- Examples of integer division:
- 17 divided by 5 equals 3
- 35 divided by 9 equals 3
Division with Real Numbers
- When one or both operands in a division expression are real numbers, the result is a real number.
- Examples of division with real numbers:
- 17.5 divided by 5 equals 3.5
- 17 divided by 5.5 equals 3.09
- 17.5 divided by 5.5 equals 3.1818
Biometric-Input Devices
- Biometrics is the science of measuring individual body characteristics to identify a person.
- Biometric characteristics include fingerprints, hands, eyes, voice, and facial features.
Output Devices
- Display screens include LED, LCD, and Plasma.
- Display resolution is a measure of the number of pixels on the screen, represented in width by height.
- Printers include plotters, photo printers, multi-function printers, and 3D printers.
Source Data-Entry Devices
- Scanners are used to capture data.
- Bar-Code Readers are used to capture data.
- RFID (Radio Frequency Identification) is used to capture data.
- Image capturing devices include digital cameras and webcams.
Audio-Input Devices
- Speech-Recognition Systems use a microphone or telephone as an input device.
- Speech-Recognition Systems convert a person's speech into digital signals by comparing against 200,000 or more stored patterns.
Processing
- Cache temporarily stores instructions and data that the processor uses frequently to speed up processing.
- The CPU works much faster than RAM, so it often must wait for information from RAM, which cache helps to alleviate.
Secondary Storage
- Hard Disks are still the major secondary-storage device for desktop/tower computers.
- Hard Disks use a read/write head to access and store data.
Learn about the rules of division in arithmetic operations, including division of integers and real numbers, and how to determine the type of answer.
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