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