# Ultrasonic – Exercise – 1

Exercise – 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
Answer : (a)
Explanation
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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
Answer : (b)
Explanation
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3. SONAR stands for :

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

Answer
Answer : (c)
Explanation
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4. The sound wave of frequency more than 109 is known as :

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

Answer
Answer : (c)
Explanation
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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
Answer : (b)
Explanation
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