Sound — Paper 1 · IGCSE Physics (9-1) 0972

26 A dolphin has a range of audible frequencies of 150 Hz–150 kHz. Which range of frequencies can be heard both by humans with good hearing and by dolphins? A 20 Hz–150 Hz B 20 Hz–150 kHz C 20 kHz–150 kHz D 150 Hz–20 kHz

1 marks

Answer: D

This question in 0972/11 May/June 2018

21 Ultrasound is used in a hospital to scan a patient. Ultrasound refracts at the boundary between muscle and bone because it travels at a greater speed in bone. Which change takes place when the ultrasound travels from muscle into bone? A The frequency of the wave decreases. B The frequency of the wave increases. C The wavelength of the wave decreases. D The wavelength of the wave increases.

1 marks

Answer: D

This question in 0972/11 May/June 2019

26 A pulse of sound is produced at the bottom of a boat. The sound travels through the water and is reflected from a shoal of fish. The sound reaches the boat again after 1.2 s. The speed of sound in the water is 1500 m / s. boat shoal of fish How far below the bottom of the boat is the shoal of fish? A 450 m B 900 m C 1800 m D 3600 m

1 marks

Answer: B

This question in 0972/11 May/June 2019

27 Which range is approximately correct for the audio frequencies that can be detected by a healthy human ear? A 2 Hz to 2000 Hz B 2 Hz to 20 000 Hz C 20 Hz to 2000 Hz D 20 Hz to 20 000 Hz

1 marks

Answer: D

This question in 0972/11 May/June 2019

26 A man hears a starting pistol fire 1.5 seconds after he sees a puff of smoke from the pistol. The sound and the smoke are made at the same time. The starting pistol is 450 metres away from the man. What is the speed of sound calculated from this observation? A 150 m / s B 300 m / s C 330 m / s D 625 m / s

1 marks

Answer: B

This question in 0972/11 Oct/Nov 2019

26 The graphs show the displacement of particles in sound waves from three sources X, Y and Z. The scales on the graphs are all identical. source X source Y displacement displacement 0 0 0 time 0 time source Z displacement 0 0 time Which sources are producing sound waves with the same pitch? A X and Y only B Y and Z only C X and Z only D X, Y and Z

1 marks

Answer: B

This question in 0972/11 May/June 2020

26 A dolphin sends out a sound wave. An echo returns 0.010 s later from a fish which is 7.5 m from the dolphin. What is the speed of the sound wave in water? A 0.075 m / s B 0.15 m / s C 750 m / s D 1500 m / s

1 marks

Answer: D

This question in 0972/12 May/June 2020

26 A police car with its siren sounding is stationary in heavy traffic. A pedestrian notices that, although the loudness of the sound produced does not change, the pitch varies. Which row describes the amplitude and the frequency of the sound? amplitude frequency A constant constant B constant varying C varying constant D varying varying

1 marks

Answer: B

This question in 0972/11 Oct/Nov 2020

24 What is ultrasound? A sound waves that are so loud that they damage human hearing B sound waves that are too high-pitched for humans to hear C sound waves that are too low-pitched for humans to hear D sound waves that are too quiet for humans to hear

1 marks

Answer: B

This question in 0972/11 Oct/Nov 2021

22 Student X fires a starting pistol which produces smoke and sound. Student Y is standing 100 m away and sees the smoke the instant it is produced. The speed of sound in air is 340 m / s. What is the time delay between student Y seeing the smoke and hearing the sound? A 0.29 s B 0.59 s C 1.7 s D 3.4 s

1 marks

Answer: A

This question in 0972/11 May/June 2023

22 A boy shouts and hears the echo from a tall building 2.2 s later. The speed of sound in air is 330 m / s. How far away from the boy is the building? A 150 m B 300 m C 360 m D 730 m

1 marks

Answer: C

This question in 0972/12 May/June 2023

23 Dogs can hear sounds in the range from 100 Hz to 45 kHz. Which statement is correct? A Any sound a dog can hear can also be heard by a human. B Any sound a human can hear can also be heard by a dog. C Dogs can hear some low frequency sounds that are silent for humans. D Dogs can hear some high frequency sounds that are silent for humans.

1 marks

Answer: D

This question in 0972/11 Oct/Nov 2023

17 Which row describes a seismic P-wave? type of wave direction of vibration A longitudinal parallel to the direction of propagation of the wave B longitudinal perpendicular to the direction of propagation of the wave C transverse parallel to the direction of propagation of the wave D transverse perpendicular to the direction of propagation of the wave

1 marks

Answer: A

This question in 0972/11 May/June 2024

22 The table shows data for the hearing ranges of different animals. Which animal has the most similar hearing range to a human? animal hearing range / Hz A turtle 20–1000 B mouse 1000–1 000 000 C moth 20 000–300 000 D elephant 16–12 000

1 marks

Answer: D

This question in 0972/11 May/June 2024

23 Which description of ultrasound is correct? A longitudinal waves with a frequency greater than 20 000 Hz B longitudinal waves with a frequency less than 20 Hz C transverse waves with a frequency greater than 20 000 Hz D transverse waves with a frequency less than 20 Hz

1 marks

Answer: A

This question in 0972/11 May/June 2024

17 How does the direction of vibration of a longitudinal wave compare to its direction of propagation and which wave example is longitudinal? direction of vibration compared to direction wave example of propagation A at right angles ultrasound waves B at right angles ultraviolet waves C parallel ultrasound waves D parallel ultraviolet waves

1 marks

Answer: C

This question in 0972/12 May/June 2024

22 A pulse of sound is produced at the bottom of a boat. The sound travels through the water and is reflected from a shoal of fish. The sound reaches the boat again 1.2 s after it is produced. The speed of sound in the water is 1500 m / s. boat shoal of fish How far below the bottom of the boat is the shoal of fish? A 450 m B 900 m C 1800 m D 3600 m

1 marks

Answer: B

This question in 0972/12 May/June 2024

23 The frequency of a sound wave increases from 31 000 Hz to 32 000 Hz. What is the nature of the wave and how does it sound to a human with normal hearing? A It is a longitudinal wave with a decreasing pitch. B It is a transverse wave with an increasing pitch. C It is a longitudinal wave that cannot be heard by a human with normal hearing. D It is a transverse wave that cannot be heard by a human with normal hearing.

1 marks

Answer: C

This question in 0972/12 May/June 2024

23 The horn on a ship makes a sound. The captain on the ship hears an echo from a cliff 4.0 s later. The speed of sound is 340 m / s. How far away is the cliff from the ship? A 170 m B 340 m C 680 m D 1400 m

1 marks

Answer: C

This question in 0972/11 Oct/Nov 2024

19 Which row correctly describes the vibrations of a transverse wave and also gives a correct example of a transverse wave? example of a description of vibrations transverse wave A at right angles to the wave direction sound B at right angles to the wave direction water wave C parallel to the wave direction sound D parallel to the wave direction water wave

1 marks

Answer: B

This question in 0972/11 May/June 2025

23 The amplitude and the frequency of a sound wave both increase. What happens to the loudness and what happens to the pitch of the sound? loudness pitch A decreases decreases B decreases increases C increases decreases D increases increases

1 marks

Answer: D

This question in 0972/11 May/June 2025

24 Which statements about sound and ultrasound are correct? sound ultrasound A humans can hear frequencies the speed in air between 20 Hz and 20 000 Hz is 330 m / s B humans can hear frequencies the speed in air less than 20 000 Hz is 100 m / s C the speed in air is 100 m / s has a frequency greater than 20 000 Hz D the speed in air is 330 m / s has a frequency less than 20 Hz

1 marks

Answer: A

This question in 0972/11 May/June 2025

18 The diagrams show examples of wave motion. waves on water waves in air ripple tank drum 1 2 waves on a rope waves in a spring 3 4 Which waves are longitudinal? A 1 only B 2, 3 and 4 C 2 and 3 only D 2 and 4 only

1 marks

Answer: D

This question in 0972/12 May/June 2025

23 The diagram shows the ranges of human hearing and of ultrasound waves. range of i} i} i} i} I I i} 1 i} 1 human hearing ultrasound i} i} i} i} i) I i) I I I i 1 I] 1 i} 2 x 10' 2 x 104 Which characteristic of sound waves do the numbers on the diagram refer to? A amplitude in cm B_ frequency in Hz C speed in metres/second D wavelength in metres

1 marks

Answer: B

This question in 0972/12 May/June 2025