Question

Match the statements in Column A with those in Column B.

Column A	Column B
(a) Echo	(i) Mechanical waves which do not get scattered in water easily.
(b) Sonar	(ii) A branch of medical science which uses ultrasonic waves to find any damage in internal organs.
(c) Radar	(iii) A device based on echoes and used for finding depth of sea or lakes.
(d) Ultrasonic waves	(iv) A phenomenon based on the reflection of sound.
(e) Ultrasonography	(v) A device based on reflection of sound and used for locating enemy aircraft.

Answer 1

Column A	Column B
(a) Echo	(iv) A phenomenon based on the reflection of sound.
(b) Sonar	(iii) A device based on echoes and used for finding depth of sea or lakes.
(c) Radar	(v) A device based on reflection of sound and used for locating enemy aircraft.
(d) Ultrasonic waves	(i) Mechanical waves which do not get scattered in water easily.
(e) Ultrasonography	(ii) A branch of medical science which uses ultrasonic waves to find any damage in internal organs.