1. A grand piano is part of the string musical instruments resonating by pounding on keys attach to corresponding strings fixed within the body of the piano. The one that resonates with the lowest note is a a. light, thick and short string b. heavy, thick and long string c. heavy, thick and short string d. light, thin and long string. 2. All of the following describes a MECHANICAL WAVE disturbance; EXCEPT a. Matter maybe displaced during its propagation. b. A vibration propagating through matter or empty space. c. It carries with it energy and information d. It travels in straight line and can be reflected, refracted or diffracted as the case maybe. 3. The technology utilized in underwater navigation to locate objects and measure distance or depth a. LIDAR b. SONAR C. RADAR d. Submarine

1. A grand piano is part of the string musical instruments resonating by pounding on keys attach to corresponding strings fixed within the body of the piano. The one that resonates with the lowest note is a a. light, thick and short string b. heavy, thick and long string c. heavy, thick and short string d. light, thin and long string. 2. All of the following describes a MECHANICAL WAVE disturbance; EXCEPT a. Matter maybe displaced during its propagation. b. A vibration propagating through matter or empty space. c. It carries with it energy and information d. It travels in straight line and can be reflected, refracted or diffracted as the case maybe. 3. The technology utilized in underwater navigation to locate objects and measure distance or depth a. LIDAR b. SONAR C. RADAR d. Submarine