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