CBSE Class 9 soundwaves — practice questions
46 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 9 soundwaves in the app →Sound is produced by:Sound waves are an example of:Sound CANNOT travel through:In a sound wave, a region where the density of the medium is HIGHER than average is called a:The human audible frequency range is approximately:In which medium does sound travel FASTEST?The wavelength λ, frequency ν, and speed v of a wave are related by:Two friends stand at opposite ends of a long steel fence, 340 m apart. One taps the fence; the other has her eAn object oscillates 200 times in 5 seconds. Its frequency is:You hear thunder 5 seconds after seeing the lightning flash. Approximately how far away did the lightning striWhich characteristic of a sound wave determines its LOUDNESS?A tuning fork produces a sound of frequency 256 Hz. If the speed of sound in air is 340 m/s, the wavelength ofCalculate the time period of a sound of frequency 50 Hz:Two astronauts working on the exterior of a space station, separated by a few metres, CANNOT hear each other'sThe minimum distance from a reflecting surface needed to hear a CLEAR echo (with speed of sound ≈ 340 m/s) is A sonar pulse sent from a ship hits a submarine and returns after 0.90 s. Speed of sound in seawater is 1530 mSound is described as a LONGITUDINAL wave because:A musical instrument and a tuning fork both produce a sound at 440 Hz — but the violin sounds 'rich' while theAn ultrasonic wave has a frequency of 50 kHz. If the speed of sound in air is 340 m/s, its wavelength is approSound INTENSITY decreases as you move away from the source because:In a longitudinal wave, particles vibrate:A tuning fork produces sound by:A region of HIGH air density in a sound wave is called a:What does ν (the Greek letter nu) typically denote for a wave?Speed of sound in air is roughly:How is sound INTENSITY related to the SQUARE of the AMPLITUDE?Which of the following CANNOT carry sound?An echo is a:A whistle has a frequency of 1700 Hz. If the speed of sound in air is 340 m/s, the wavelength is:A bat emits an ultrasonic pulse at 60 kHz. After 0.04 s, it hears the echo. How far is the obstacle? (Speed ofWhat is the TIME PERIOD of a sound wave with frequency 100 Hz?Sound travels through a steel rail at 5000 m/s. A train signal sent through the rail reaches a distance of 1 kA child claps once. The sound reaches a wall 17 m away and reflects back. The child hears a distinct echo becaA sound wave's loudness is perceived from its:Sound levels above 80 dB sustained for long periods can:A sound wave's frequency is 256 Hz (middle C) in air at 340 m/s. In hydrogen gas where speed is 1300 m/s, the The frequency of human hearing typically decreases with age. The MOST AFFECTED frequencies are:Two sound waves of the same frequency but slightly different amplitudes are heard simultaneously. The HUMAN PESound is described as a LONGITUDINAL wave because:Astronauts on the surface of the moon cannot hear each other's voice through air because:The LOUDNESS of a sound depends on the wave's:The audible range of frequency for humans is:For a distinct echo to be heard, the reflecting surface must be at a minimum distance of (taking speed of sounReverberation refers to:SONAR (SOund Navigation And Ranging) uses:Which two animals are known to use natural echolocation to navigate and hunt?