Question

Match the following:
$\begin{array}{cc}\text{a.Doppler effect}& \text{i. Measure distance, direction}\\ & \text{and speed of underwater object}\\ \text{b. RADAR}& \text{ii. Relative motion between the}\\ & \text{source of sound and observer}\\ \text{c.SONAR}& \text{iii. Audible range up to 100 kHz}\\ \text{d. Bats}& \text{iv. Electromagnetic waves}\end{array}$

• A. a-(ii), b-(iv), c-(i), d-(iii)
• B. a-(ii), b-(iii), c-(i), d-(iv)
• C. a-(ii), b-(iv), c-(ii), d-(i)
• D. a-(i), b-(iii), c-(ii), d-(iv)

Answer 1

The correct option is A

a-(ii), b-(iv), c-(i), d-(iii)

Doppler Effect arises when there is a relative motion between the source of sound and the observer.
RADAR works similar to that of SONAR, but electromagnetic waves used in the place of ultrasonic waves.
SONAR stands for Sound Navigation and Ranging. It is used to measure distance, direction and speed of underwater object.
Bats has an ultrasonic audible range up to 100 kHz