MCQ Science and Technology Class 9 Chapter 12 Maharashtra Board Study of Sound 1. What is applied to the skin during sonography to ensure proper contact?WaterGelOilCreamQuestion 1 of 202. What misuse of sonography is mentioned in the document?Overuse in hospitalsFemale foeticideIncorrect diagnosisRadiation exposureQuestion 2 of 203. What part of the human ear collects sound waves?EardrumPinnaCochleaAuditory nerveQuestion 3 of 204. What vibrates in the middle ear when a sound wave reaches it?PinnaEardrumCochleaEustachian tubeQuestion 4 of 205. What structure in the inner ear resembles the shell of a snail?EardrumPinnaCochleaAuditory nerveQuestion 5 of 206. What converts vibrations into electrical signals in the human ear?EardrumPinnaCochleaEustachian tubeQuestion 6 of 207. What should be avoided to prevent injury to the eardrum?Listening to soft soundsUsing earphones at high volumeCleaning with cottonExposure to natural soundsQuestion 7 of 208. In the solved example, what is the depth of the sea if the SONAR echo is received after 4 seconds?1550 m3100 m6200 m775 mQuestion 8 of 209. In the solved example, what is the velocity of sound in seawater used for the SONAR calculation?340 m/s1550 m/s344 m/s375 m/sQuestion 9 of 2010. In the exercise example, what is the temperature when the velocity of sound in air is 344 m/s?10°C15°C20°C25°CQuestion 10 of 2011. What medium does sound not travel through, as per the exercise?AirWaterVacuumSteelQuestion 11 of 2012. Which medium has a higher velocity of sound than water, as per the exercise?AirSteelHydrogen gasVacuumQuestion 12 of 2013. What natural phenomenon demonstrates that sound travels slower than light?EchoReverberationLightning and thunderSONARQuestion 13 of 2014. What is used to discover objects deep inside the sea, as per the exercise?RadarSONARX-rayMRIQuestion 14 of 2015. Why is the roof of a conference hall curved, as per the exercise?To absorb soundTo reflect sound evenlyTo block soundTo increase reverberationQuestion 15 of 2016. Why is there high reverberation in a closed, empty house, as per the exercise?Due to sound absorptionDue to multiple reflections from bare wallsDue to soft surfacesDue to low sound intensityQuestion 16 of 2017. Why is an echo not heard in a classroom, as per the exercise?Walls are too farReflecting surfaces are too closeSound is completely absorbedSound travels too fastQuestion 17 of 2018. In the exercise example, what is the distance of lightning if thunder is heard 4 seconds after seeing it?680 m1360 m1700 m340 mQuestion 18 of 2019. In the exercise example, what is the velocity of sound if an echo is heard after 4 seconds from a wall 660 m away?320 m/s330 m/s340 m/s350 m/sQuestion 19 of 2020. In the exercise example, what is the distance between two parallel walls if echoes are heard after 4 s and 6 s?990 m1320 m1650 m1980 mQuestion 20 of 20 Loading...
Leave a Reply