4.5.6.4 Bitmapped graphics Quiz: AQA Computer Science, Unit 5

The 20 questions

1. What is the smallest single component of a bitmapped image?

   • Byte
   • Pixel
   • Vector shape
   • Raster line

2. What term describes the number of bits used to represent the colour of each pixel?

   • Colour depth
   • Resolution
   • Sample rate
   • Bit depth ratio

3. According to the AQA specification, in what unit is bitmap image resolution expressed?

   • Bits per pixel
   • Hertz
   • Dots per inch
   • Pixels per byte

4. How is the total size of a bitmap image in pixels calculated?

   • Width times height
   • Resolution times depth
   • Width plus height
   • Width times depth

5. Which item is stored as metadata within a bitmapped image file?

   • Image dimensions
   • Compression key
   • Sampling frequency
   • Audio bit rate

6. What increases when the colour depth of a bitmapped image is increased?

   • Physical size
   • Frame rate
   • Pixel resolution
   • Available colours

7. How many colours can one pixel show with 8 bits of colour depth?

   • 128
   • 8
   • 64
   • 256

8. An image is 800 x 600 pixels at 24 bits per pixel. How many bytes does it need, ignoring metadata?

   • 1,440,000 bytes
   • 11,520,000 bytes
   • 1,152,000 bytes
   • 480,000 bytes

9. A 1920 x 1080 image has 8 bits per pixel. How many bytes does it need, ignoring metadata?

   • 2,073,600 bytes
   • 1,036,800 bytes
   • 2,073,600 bits
   • 16,588,800 bytes

10. A 100 x 100 image has 1 bit per pixel. How many bits does it need?

    • 20,000 bits
    • 1,000 bits
    • 10,000 bits
    • 100 bits

11. An image is 3 inches wide at 300 dpi. How many pixels wide is it?

    • 100 pixels
    • 900 pixels
    • 3,000 pixels
    • 300 pixels

12. Doubling both the width and height of an image in pixels changes its file size by what factor?

    • Half
    • Four times
    • Two times
    • Eight times

13. If the colour depth of an image is reduced from 24 bits to 12 bits, how does storage change?

    • It doubles
    • It quarters
    • It stays constant
    • It halves

14. A 4 x 4 pixel image has 8 bits per pixel. How many bytes does it need, ignoring metadata?

    • 16 bytes
    • 4 bytes
    • 128 bytes
    • 8 bytes

15. How many pixels are in a 640 x 480 image?

    • 307,200
    • 1,228,800
    • 64,000
    • 120,480

16. A 1024 x 768 image has 16 bits per pixel. How large is it in KiB, ignoring metadata?

    • 768 KiB
    • 1536 KiB
    • 3072 KiB
    • 1024 KiB

17. Why is an actual bitmap image file larger than its calculated pixel data storage requirement?

    • Analogue noise
    • Quantisation error
    • Stored metadata
    • Lossy compression

18. What factor directly determines the uncompressed data size of a bitmap image?

    • Physical print height
    • Dots per inch
    • Total pixel count
    • Display screen size

19. What visual effect occurs when a bitmapped graphic is significantly enlarged?

    • Colour shifting
    • Blurry anti-aliasing
    • Vector distortion
    • Pixelation

20. An image has 2^20 pixels at 4 bits per pixel. How many bytes does it need, ignoring metadata?

    • 1,048,576 bytes
    • 524,288 bytes
    • 4,194,304 bytes
    • 2,097,152 bytes

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