Q: 101 (IAS/2000)
question_subject:
Science
question_exam:
IAS
stats:
0,24,29,15,5,24,9
keywords:
{'cd': [0, 2, 0, 0], 'audio player': [0, 1, 0, 0], 'compact disc': [0, 2, 0, 0], 'barium titanate ceramic': [0, 1, 0, 0], 'quartz crystal': [0, 1, 0, 0], 'titanium needle': [0, 1, 0, 0], 'laser beam': [0, 1, 0, 0], 'sound': [4, 3, 10, 15]}
For reproducing sound, a CD (Compact Disc) audio player uses a laser beam. The CD player reads the digital information stored on the CD using a laser beam that scans the surface of the disc. The laser beam detects the pits and lands on the CD, which represent the 0s and 1s of the digital audio data. By accurately reading these digital bits, the CD player converts them into an analog audio signal that can be amplified and played through speakers or headphones.
Therefore, the correct answer is:
laser beam