Question

Match the statements of column A with those of column B.

Column A	Column B
A) Dolphins	p) SONAR
B) Tracking of fish in ocean	q) Pressure difference in the medium
C) Propagation of longitudinal waves	r) Disturbance lasting for a short duration
D) Pulse	s) Ultrasonic sounds

• A. A → s; B → p; C → q; D → r;
• B. A → s; B → p; C → r; D → q;
• C. A → q; B → s; C → p; D → r;
• D. A → r; B → s; C → q; D → p;

Answer 1

The correct option is A

A → s; B → p; C → q; D → r;

1. Dolphins can hear sounds of frequencies more than 20,000 Hz, i.e., ultrasounds.
2. A sonar system sends sound waves down into the sea in pulses. These pulses are reflected back to the surface when they hit items such as fish, vegetation, or the bottom.
3. Propagation of longitudinal waves is through pressure difference in the medium.
4. Pulse is a disturbance lasting for a short duration.

Hence, option A is correct.

Dolphins	Ultrasonic sounds
Tracking of fish in ocean	SONAR
Propagation of longitudinal waves	Pressure difference in the medium
Pulse	Disturbance lasting for a short duration