Home PYQs UPPSC UPPSC MCQs Prelims 2007 (GS Paper I)

Question

When the TV is switched ON then:

  1. Both audio and visuals start simultaneously
  2. The audio is heard immediately but the video is visible later because the video needs some practice time
  3. The visual starts immediately but audio is heard later because the sound travels less than the speed of light
  4. It depends on the brand of TV

Answer:

Option C: The visual starts immediately but audio is heard later because the sound travels less than the speed of light

Detailed Solution:

The correct answer is “The visual starts immediately but audio is heard later because the sound travels less than the speed of light”.

Visual signals, such as the image displayed on the screen, can be processed and displayed almost instantly. However, audio signals take a fraction of a second longer to be heard because sound travels at a slower speed than light.