Input and Output Devices

Question 1

What is input?

Answer 1

Provides the running instructions on what to do next.
Data that still needs to be processed.

Question 2

Name 3 types of input devices?

Answer 2

Scanners
Digital camera
Biometric input

Question 3

What do digital cameras range from?

Answer 3

Cellphone cameras to digital compact cameras to DSLR ( Digital Single Lens Reflex) Cameras.

Question 4

Name the advantages of digital cameras.

Answer 4

Can see the image immediately, can take hundreds or thousands of photos, able to delete any unwanted photos immediately and easy to transfer images to a computer to edit/save.

Question 5

Name the disadvantages of digital cameras?

Answer 5

Cost can be very expensive especially with DSLR cameras.
Can be easy to drop your smartphone and if the camera is damaged it can be expensive to repair.

Question 6

What are the most important specifications to look at when purchasing a camera?

Answer 6

Megapixels
Optical zoom
Storage space available
Resolution
ISO Rating

Question 7

How can you ensure that your lens will produce better images?

Answer 7

If you by a large lens more light in being captured therefore it will improve the quality of the image.

Question 8

How can sensor size aid the quality of your pictures?

Answer 8

Large sensors capture more light but also allow better quality in different lighting.

Question 9

What’s the difference between optical zoom vs digital zoom?

Answer 9

Optical: uses lens on camera to get closer to the object being photographed.
Digital: Using the magnifying glass feature in the imaging software to get closer to the image, reduces the image quality.

Question 10

What is resolution?

Answer 10

Total number of pixels that make up a picture.

Question 11

What does the ISO Rating rate?

Answer 11

How sensitive the camera is to light.

Question 12

What is a flatbed scanner?

Answer 12

Slightly larger than A4 in size.
Can scan photos, magazines and documents.

Question 13

What is a sheet fed scanner?

Answer 13

Portable scanner
Smaller than Flatbed scanner
Can only scan one page rather than a book.

Question 14

How is the quality of a scanned image determined?

Answer 14

Resolution
Pixels
Colour depth

Question 15

What are 3 advantages of scanners?

Answer 15

Large documents can be stored in a single file
Electronic copies take up no physical space in a building.
Scan images and convert them into a format that can be stored digitally.

Question 16

What are the disadvantages of scanners?

Answer 16

Scanning can be slow
Quality of the digital image depends to a large extent on the quality of the original copy.