For reproducing sound, a CD (Compact Disc) audio player uses a
- (a)quartz crystal
- (b)titanium needle
- (c)laser beam
- (d)barium titanate ceramic
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Official answer(c) laser beam
Computer & Information Technology
54 questions in Science & Technology.
Asked in 2000, 1999, 1997, 1995
Assertion (A): Information technology is fast becoming a very important field of activity in India. Reason (R): Software is one of the major exports of the country and India has a very strong base in hardware.
- (a)Both A and R are true, and R is the correct explanation of A
- (b)Both A and R are true, but R is not a correct explanation of A
- (c)A is true, but R is false
- (d)A is false, but R is true
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Official answer(c) A is true, but R is false
The world’s fastest computer has been able to perform (as of Dec. 1996)
- (a)106 operations per second
- (b)109 operations per second
- (c)1012 operations per second
- (d)1015 operations per second
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Official answer(c) 1012 operations per second
104. The technique used to transmit audio signals in television broadcasts is
- (a)Amplitude Modulation
- (b)Frequency Modulation
- (c)Pulse Code Modulation
- (d)Time Division Multiplexing
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Official answer(b) Frequency Modulation