DSSSB TGT CS

Topic MCQs — Graphics, Multimedia & Mobile Computing ​

25 questions · DSSSB TGT CS style · Original

Q1. The smallest addressable unit of a digital image is called a:

  • A) Voxel
  • B) Pixel
  • C) Texel only
  • D) Dot pitch Answer: B
    Pixel = picture element; voxel is 3D volume element.

Q2. Aspect ratio 16:9 means:

  • A) Resolution is always 1920×1080
  • B) Width:height = 16:9
  • C) File is compressed 16/9
  • D) Colour depth is 16 bits Answer: B
    Aspect ratio is proportional width to height, not a fixed resolution.

Q3. Which is true for vector graphics?

  • A) Built from a pixel grid
  • B) Scale without pixelation
  • C) Best only for photographs
  • D) Cannot store colours Answer: B
    Vectors use mathematical paths, so they scale cleanly.

Q4. JPEG images are typically:

  • A) Lossless only
  • B) Lossy compressed
  • C) Vector format
  • D) Uncompressed always Answer: B
    JPEG commonly uses lossy compression suited to photos.

Q5. RGB colour model is primarily used in:

  • A) Offset printing inks
  • B) Display screens
  • C) CMYK conversion only
  • D) Spot-colour pantone only Answer: B
    RGB is additive light model for monitors/cameras.

Q6. CMYK is associated with:

  • A) Additive colour for LEDs
  • B) Subtractive colour for printing
  • C) HSV hue wheel only
  • D) Binary images only Answer: B
    Cyan, Magenta, Yellow, Key(Black) — print inks.

Q7. Bresenham’s line algorithm is preferred over DDA mainly because it:

  • A) Uses only floating-point maths
  • B) Uses integer decision parameters
  • C) Draws only circles
  • D) Needs no pixels Answer: B
    Bresenham avoids floating-point increments used in DDA.

Q8. Translation in 2D graphics means:

  • A) Changing only colour
  • B) Moving an object by offsets (tx, ty)
  • C) Always rotating 90°
  • D) Compressing the image file Answer: B
    Translation adds displacements to coordinates.

Q9. Which multimedia component stores note events rather than sampled sound?

  • A) WAV
  • B) MP3
  • C) MIDI
  • D) MPEG-2 Audio Layer Answer: C
    MIDI encodes performance events/instruments, not waveform samples.

Q10. MP3 compression for audio is generally:

  • A) Lossless
  • B) Lossy
  • C) Vector-based
  • D) Uncompressed PCM only Answer: B
    MP3 discards less audible information (perceptual coding).

Q11. Which format is typically lossless for images?

  • A) JPEG
  • B) PNG
  • C) MPEG-4 video
  • D) MP3 Answer: B
    PNG uses lossless compression; JPEG is lossy.

Q12. GSM in mobile communication refers to:

  • A) Only satellite links
  • B) A cellular 2G family (TDMA-based, widely cited)
  • C) Exclusive Wi-Fi mesh
  • D) Only Bluetooth pairing Answer: B
    GSM = Global System for Mobile communications.

Q13. CDMA separates users primarily using:

  • A) Different time slots only
  • B) Different codes on shared spectrum
  • C) Different HTML pages
  • D) Different IP only Answer: B
    Code Division Multiple Access uses coding to distinguish users.

Q14. Android is best described as:

  • A) Apple’s closed desktop OS
  • B) A mobile OS with Linux-based kernel
  • C) Only a web browser
  • D) A printer protocol Answer: B
    Android is Linux-kernel-based mobile OS.

Q15. Bluetooth is mainly designed for:

  • A) Global satellite internet
  • B) Short-range personal area networking
  • C) Replacing all cellular networks
  • D) Only wired USB Answer: B
    Bluetooth is short-range wireless PAN technology.

Q16. Wi-Fi commonly refers to:

  • A) IEEE 802.11 WLAN family
  • B) Only Bluetooth 5
  • C) GSM voice codecs
  • D) MIDI streaming Answer: A
    Wi-Fi is wireless LAN based on IEEE 802.11.

Q17. Augmented Reality (AR) typically:

  • A) Replaces the entire real world with a fully virtual one
  • B) Overlays digital content on the real world
  • C) Is identical to batch processing
  • D) Means lossless compression Answer: B
    AR enhances reality; VR immerses in a virtual environment.

Q18. Virtual Reality (VR) is characterized by:

  • A) Paper documents only
  • B) Immersive computer-generated environments
  • C) Only SMS texting
  • D) CMYK printing Answer: B
    VR aims at immersion via HMD/simulated world.

Q19. Resolution 1920×1080 primarily indicates:

  • A) Aspect ratio only
  • B) Number of horizontal and vertical pixels
  • C) Refresh rate in Hz
  • D) File size in MB Answer: B
    It is pixel dimensions (Full HD frame size).

Q20. Scaling with sx = 2, sy = 2 will:

  • A) Move the object by 2 units
  • B) Double the object’s size about the origin (typically)
  • C) Rotate by 2 radians
  • D) Convert RGB to CMYK Answer: B
    Uniform scaling by 2 enlarges linear dimensions ×2.

Q21. Which is a graphics primitive?

  • A) Deadlock
  • B) Line / circle / polygon
  • C) Foreign key
  • D) Scrum sprint Answer: B
    Primitives are basic drawable elements.

Q22. GIF format is especially known for:

  • A) Unlimited true-colour lossless video
  • B) Limited colour palette and simple animation support
  • C) Only vector paths
  • D) Only raw PCM audio Answer: B
    Classic GIF: palette-based colours + simple animation.

Q23. Lossy compression means:

  • A) Exact original can always be reconstructed
  • B) Some information is permanently discarded
  • C) Only text can be compressed
  • D) No size reduction occurs Answer: B
    Lossy trades perfect fidelity for smaller size.

Q24. HSV colour model parameters stand for:

  • A) Hue, Saturation, Value
  • B) Hyper, Scale, Vector
  • C) Host, Socket, VLAN
  • D) Hash, Salt, Verify Answer: A
    HSV (or HSB) is used in design colour pickers.

Q25. iOS is:

  • A) Google’s open mobile OS
  • B) Apple’s mobile operating system
  • C) A Bresenham variant
  • D) A lossless audio codec only Answer: B
    iOS is Apple’s closed-ecosystem mobile OS.