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Ultrasonic – 1 – 1

1. The frequency of ultrasonic wave is :

(a) More than 20 kHz
(b) Less than 20 Hz 
(c) 200 Hz
(d) 20 Hz to 20 kHz

ANSWER

EXPLANATION

2. The infrasonic wave have a frequency of :

(a) More than 20 kHz
(b) Less than 20 Hz 
(c) 200 Hz
(d) 20 Hz to 20 kHz

ANSWER

EXPLANATION

3. SONAR stands for :

(a) Sound not radiated
(b) Sound obstacles and radiations
(c) Sound Navigation and Ranging
(d) None of these

ANSWER

EXPLANATION

4. The sound wave of frequency more than 109 is known as :

(a) Ultrasonic
(b) Infrasonic 
(c) Hypersonics
(d) Audible sound 

ANSWER

EXPLANATION

5. The time gap between the two sounds for an echo is :

(a) 1 sec.
(b) 1/10 sec.
(c) 1 min.
(d) None of these

ANSWER

EXPLANATION

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