1) A fisherman fishing at night hears the sound of gecko. if it were daytime, will he hear it louder or softer? a) Louder, the speed of sound is faster to water than to air.  b) Softer, the wave fronts of sound in warm air bends upward. c) Louder, sound is bending toward the ground in ward air. d) Softer, speed of sound is lower at night. 2) What happens to the sound when an object such as sounding board is forced to vibrate by a sound source? a) The sound becomes louder. b) The sound becomes softer. c) The sound is the same. d) The sound decreases then increases instantly.. e) cannot be determined 3) in fishing technique called " paghikot " or fishing net, some fishermen throws stones in the water to disturb the fish until they are trapped in the net. How does the throwing of stones help in net fishing? a) Stone produces louder sound in water which disturbs the fish. b) Stone makes the water more denser so fish are less buoyant. c) Stone push forward the fish until they are trapped in the net. d) stone produces another water waves that causes uncontrolled swimming of fishes. 4) Wavelength is defined as the distance from one crest to another or from trough to another. How many waves are available if the number of crest is five? a) 2 b) 3 c) 4 d) 5 5) sound is the transfer of energy from one vibrating object in waves that travel through medium. Which of the following medium thus the sound travel fastest? a) river b) clouds c) vacuum d) bridge e) none of the above f) all of the above 6) The hanging Bridge at Guinobatan going to Allan Padua's house sways, back and forth at a frequency of  about 0.1Hz. What is the period of vibration? a) 10 s b) 0.1s c) 1s d) 100s 7) Sound wave is longitudinal wave. What is the BEST explanation why sound possess longitudinal wave? a) The medium moves back and forth parallel to the direction in which the wave travels b) The medium moves at right angles to the direction in which the wave travels c) The medium travels from different directions until ears reaches d) The medium moves at horizontal to the direction in which the wave travels 8) In an ultrasound imaging, physician can “see” the beating heart of a developing fetus even in 11 weeks old only. This technology is possible because the use of what? a) high-frequency sound b) X-Rays c) low-frequency sound d) Gamma Rays 9) What is the part of the wave that refers to the distance from the midpoint to the crest (or through) of the wave? a) Wavelength b) Frequency c) Amplitude d) Hertz 10) What happens to the speed of sound when the air temperature increases? a) The speed of sound increases b) The speed of sound decreases c) The speed of sound remains the same d) The speed of sound fluctuates

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