Physics for IGCSE & O level - Waves And Sounds (Section 2)
1
What wave phenomenon is demonstrated when a wave passes through a narrow opening?
отговор
(C)
Diffraction
2
Which of the following are uses of echos in the world?
отговор
A
B
C
3
Which of the following are uses of ultrasound?
отговор
A
B
C
4
What type of wave is light?
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(B)
Transverse
5
What are the repeating patterns in a wave represented by?
отговор
(B)
Wavelength
6
The human ear can detect sounds up to a frequency of about:
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(B)
20 kHz
7
What can ultrasound be used for in the medical field?
отговор
A
C
8
Which type of wave is a sound wave?
отговор
(B)
Longitudinal wave
9
Which is a use of ultrasound?
отговор
A
B
C
D
10
What does ultrasound help to distinguish?
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(B)
Different layers of soft tissue
11
What is an example of the reflection of sound waves?
отговор
(B)
An echo
12
What unit is the speed of sound often measured in?
отговор
(B)
Meters per second (m/s)
13
Which term describes the maximum displacement of a wave from its rest position?
отговор
(B)
Amplitude
14
Which of the following is a characteristic of sound waves?
отговор
B
C
D
15
What determines the loudness of a sound?
отговор
(C)
Amplitude
16
What is the formula that links speed, frequency and wavelength?
отговор
(C)
Speed = Frequency x Wavelength
17
What type of wave is a sound wave?
отговор
B
D
18
What does the term 'ultrasound' refer to in terms of frequency?
отговор
(C)
Frequencies above 20 kHz
19
Which of the following is an application of the echo-sounding principle?
отговор
A
B
C
20
What is ultrasound?
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(C)
Sound waves with a frequency above the human hearing range.
21
In the metal testing, what feature of the ultrasound wave changes when it reaches a flaw (tiny gap)?
отговор
(A)
Amplitude
22
How is the energy carried by a wave related to its amplitude?
отговор
(B)
Energy is proportional to the square of the amplitude.
23
Why is ultrasound used for cleaning delicate machinery?
отговор
(B)
It uses vibrations to dislodge dirt.
24
What is one practical application of sonar?
отговор
(B)
Measuring the depth of the ocean
25
Which of the following best describes how sound travels?
отговор
(B)
Through vibrations of particles in a medium.
26
What is the relationship between wavelength and frequency?
отговор
(B)
Inversely proportional
27
Which of the following best describes diffraction?
отговор
(A)
The bending of a wave around an obstacle.
28
What is the difference between transverse and longitudinal waves?
отговор
A
B
29
How is the pitch of a sound related to the frequency?
отговор
(A)
Higher frequency = higher pitch
30
What does the term 'period' represent in the context of waves?
отговор
(B)
The time for one complete wave cycle.
31
What does the Doppler effect cause to sound waves when the source is moving toward you?
отговор
(B)
Higher frequency, higher pitch
32
Why is ultrasound preferred over X-rays in some medical applications?
отговор
(D)
Ultrasound can distinguish between different layers of soft tissue.
33
What happens to the loudness of a sound if the amplitude is increased?
отговор
(C)
It increases
34
What is the term for the time it takes for one complete cycle of a wave?
отговор
(D)
Period
35
What is a characteristic of a transverse wave?
отговор
(B)
The particles of the medium move perpendicular to the wave's direction.
36
In the context of ultrasound, what is the depth of water if the pulse takes 0.1 seconds to travel to the sea-bed and return, and the speed of sound in water is 1400 m/s?
отговор
(A)
70 m
37
What happens to the energy of a wave when its amplitude increases?
отговор
(B)
The energy increases.
38
What does the amplitude of a sound wave determine?
отговор
(B)
The loudness of the sound.
39
Which of the following is NOT listed under 'Waves and sounds'?
отговор
(D)
Gravity
40
What are the two main types of mechanical waves?
отговор
A
B
41
What type of waves are ultrasound waves?
отговор
(C)
Longitudinal
42
Which is an example of wave interference?
отговор
(C)
A loud sound from two speakers
43
What happens to the wavelength if the frequency of a sound increases, assuming the speed of sound remains constant?
отговор
(B)
It decreases.
44
If a boat uses ultrasound and pulses take 0.02 seconds to travel from the boat to the seabed and back, what is the water depth (assuming the speed of sound is 1400 m/s)?
отговор
(B)
14 m
45
If the frequency of a sound wave is 110 Hz and the wavelength is 3 m, what is the speed of the wave?
отговор
(C)
330 m/s
46
In metal testing using the echo-sounding principle, what does a flaw (tiny gap) result in?
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(B)
Two reflected pulses
47
What is one industrial use of ultrasonic waves?
отговор
(D)
All of the above
48
What is the unit for measuring the loudness of sound?
отговор
(C)
Decibel (dB)
49
How does increasing the air temperature affect the speed of sound?
отговор
(B)
It increases the speed.
50
What term describes the bending of a wave when it passes from one medium to another?
