Q. A sound wave travels from air into water. What happens to its speed?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Sound travels faster in water than in air, so its speed increases when it enters water.
Correct Answer:
A
— Increases
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Q. A sound wave travels through a medium with a speed of 340 m/s and has a frequency of 1700 Hz. What is its wavelength?
A.
0.2 m
B.
0.5 m
C.
2 m
D.
1 m
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Solution
Wavelength = Speed / Frequency = 340 m/s / 1700 Hz = 0.2 m.
Correct Answer:
B
— 0.5 m
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Q. If a sound wave has a frequency of 440 Hz, what is its period?
A.
0.00227 s
B.
0.0045 s
C.
0.01 s
D.
0.1 s
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Solution
The period (T) is the inverse of frequency (f); T = 1/f = 1/440 ≈ 0.00227 s.
Correct Answer:
A
— 0.00227 s
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Q. If the frequency of a sound wave is doubled, what happens to its wavelength in a given medium?
A.
Doubles
B.
Halves
C.
Remains the same
D.
Increases by a factor of four
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Solution
Wavelength is inversely proportional to frequency; if frequency is doubled, wavelength is halved.
Correct Answer:
B
— Halves
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Q. If the frequency of a sound wave is doubled, what happens to its wavelength?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
Wavelength is inversely proportional to frequency; if frequency is doubled, wavelength halves.
Correct Answer:
B
— It halves
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Q. If two sound waves of the same frequency interfere constructively, what happens to the resultant amplitude?
A.
It decreases
B.
It remains the same
C.
It doubles
D.
It becomes zero
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Solution
In constructive interference, the amplitudes of the waves add up, resulting in a doubled amplitude.
Correct Answer:
C
— It doubles
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Q. In which medium does sound travel fastest?
A.
Air
B.
Water
C.
Steel
D.
Vacuum
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Solution
Sound travels fastest in solids like steel due to closely packed molecules.
Correct Answer:
C
— Steel
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Q. What happens to the pitch of a sound as its frequency increases?
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes inaudible
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Solution
As the frequency of a sound increases, its pitch also increases.
Correct Answer:
B
— It increases
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Q. What happens to the sound level when the intensity of sound is increased by a factor of 10?
A.
It increases by 10 dB
B.
It increases by 20 dB
C.
It increases by 30 dB
D.
It remains the same
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Solution
An increase in intensity by a factor of 10 results in an increase of 10 dB, but the sound level increases by 20 dB.
Correct Answer:
B
— It increases by 20 dB
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Q. What is the decibel level of a sound that is 10 times more intense than the reference level?
A.
10 dB
B.
20 dB
C.
30 dB
D.
40 dB
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Solution
Every increase of 10 dB represents a tenfold increase in intensity, so 10 times more intense is 20 dB.
Correct Answer:
B
— 20 dB
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Q. What is the Doppler effect?
A.
Change in frequency due to motion
B.
Change in amplitude due to distance
C.
Change in speed due to temperature
D.
Change in wavelength due to pressure
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Solution
The Doppler effect refers to the change in frequency of a wave in relation to an observer moving relative to the wave source.
Correct Answer:
A
— Change in frequency due to motion
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Q. What is the effect called when two sound waves of slightly different frequencies interfere?
A.
Doppler effect
B.
Beats
C.
Resonance
D.
Echo
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Solution
The phenomenon of two sound waves of slightly different frequencies interfering is called beats.
Correct Answer:
B
— Beats
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Q. What is the effect of increasing temperature on the speed of sound in air?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on pressure
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Solution
Increasing temperature increases the speed of sound in air.
Correct Answer:
A
— Increases
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Q. What is the effect of increasing the amplitude of a sound wave?
A.
Increases pitch
B.
Increases loudness
C.
Decreases frequency
D.
Decreases speed
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Solution
Increasing the amplitude of a sound wave increases its loudness.
Correct Answer:
B
— Increases loudness
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Q. What is the effect of temperature on the speed of sound in air?
A.
Increases with temperature
B.
Decreases with temperature
C.
No effect
D.
Increases then decreases
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Solution
The speed of sound in air increases with an increase in temperature.
Correct Answer:
A
— Increases with temperature
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Q. What is the frequency of a sound wave with a wavelength of 0.5 m in air (speed of sound = 343 m/s)?
A.
686 Hz
B.
343 Hz
C.
171.5 Hz
D.
1500 Hz
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Solution
Frequency (f) = speed/wavelength = 343 m/s / 0.5 m = 686 Hz.
Correct Answer:
A
— 686 Hz
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Q. What is the frequency of a sound wave with a wavelength of 0.5 m traveling at 340 m/s?
A.
680 Hz
B.
340 Hz
C.
170 Hz
D.
850 Hz
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Solution
Frequency (f) = Speed (v) / Wavelength (λ) = 340 m/s / 0.5 m = 680 Hz.
Correct Answer:
A
— 680 Hz
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Q. What is the fundamental frequency of a pipe open at both ends if its length is 2 m?
A.
85 Hz
B.
170 Hz
C.
340 Hz
D.
425 Hz
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Solution
The fundamental frequency is given by f = v/λ. For a pipe open at both ends, λ = 2L = 4 m. Thus, f = 343 m/s / 4 m = 85.75 Hz, approximately 85 Hz.
Correct Answer:
B
— 170 Hz
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Q. What is the fundamental frequency of a pipe open at both ends that is 2 meters long?
A.
85 Hz
B.
170 Hz
C.
340 Hz
D.
425 Hz
Show solution
Solution
The fundamental frequency is given by f = v/λ; for a pipe open at both ends, λ = 2L, so f = v/(2L) = 343/(2*2) = 42.875 Hz.
Correct Answer:
B
— 170 Hz
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Q. What is the phenomenon called when sound waves bend around obstacles?
A.
Reflection
B.
Refraction
C.
Diffraction
D.
Interference
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Solution
The bending of sound waves around obstacles is known as diffraction.
Correct Answer:
C
— Diffraction
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Q. What is the principle behind sonar technology?
A.
Reflection of sound waves
B.
Refraction of sound waves
C.
Diffraction of sound waves
D.
Interference of sound waves
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Solution
Sonar technology is based on the reflection of sound waves to detect objects underwater.
Correct Answer:
A
— Reflection of sound waves
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Q. What is the principle behind the working of a sonar?
A.
Reflection of sound waves
B.
Refraction of sound waves
C.
Diffraction of sound waves
D.
Interference of sound waves
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Solution
Sonar works on the principle of reflection of sound waves to detect objects underwater.
Correct Answer:
A
— Reflection of sound waves
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Q. What is the range of human hearing in Hertz?
A.
20 Hz to 20 kHz
B.
20 kHz to 20 MHz
C.
1 Hz to 100 kHz
D.
10 Hz to 10 kHz
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Solution
The typical range of human hearing is from 20 Hz to 20 kHz.
Correct Answer:
A
— 20 Hz to 20 kHz
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Q. What is the range of human hearing in terms of frequency?
A.
20 Hz to 20 kHz
B.
20 kHz to 20 MHz
C.
1 Hz to 100 kHz
D.
100 Hz to 10 kHz
Show solution
Solution
The typical range of human hearing is from 20 Hz to 20 kHz.
Correct Answer:
A
— 20 Hz to 20 kHz
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Q. What is the speed of sound in air at 20°C?
A.
343 m/s
B.
330 m/s
C.
300 m/s
D.
350 m/s
Show solution
Solution
The speed of sound in air at 20°C is approximately 343 m/s.
Correct Answer:
A
— 343 m/s
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Q. What is the speed of sound in air at room temperature (20°C)?
A.
343 m/s
B.
300 m/s
C.
1500 m/s
D.
1200 m/s
Show solution
Solution
The speed of sound in air at 20°C is approximately 343 m/s.
Correct Answer:
A
— 343 m/s
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Q. What is the term for the lowest frequency of a sound wave in a harmonic series?
A.
Fundamental frequency
B.
Overtone
C.
Harmonic
D.
Resonance
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Solution
The lowest frequency in a harmonic series is called the fundamental frequency.
Correct Answer:
A
— Fundamental frequency
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Q. What is the threshold of hearing in terms of sound intensity level?
A.
0 dB
B.
10 dB
C.
20 dB
D.
30 dB
Show solution
Solution
The threshold of hearing is defined as 0 dB, which corresponds to the faintest sound that can be heard by the average human ear.
Correct Answer:
A
— 0 dB
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Q. What is the unit of frequency?
A.
Hertz
B.
Decibel
C.
Newton
D.
Joule
Show solution
Solution
The unit of frequency is Hertz (Hz), which measures cycles per second.
Correct Answer:
A
— Hertz
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Q. What is the unit of sound intensity?
A.
Decibel
B.
Watt
C.
Pascal
D.
Joule
Show solution
Solution
Sound intensity is measured in decibels (dB).
Correct Answer:
A
— Decibel
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Showing 1 to 30 of 38 (2 Pages)
Sound Waves MCQ & Objective Questions
Understanding sound waves is crucial for students preparing for various school and competitive exams in India. Mastering this topic not only enhances conceptual clarity but also boosts your confidence in tackling MCQs and objective questions. By practicing sound waves MCQ questions, you can identify important questions and improve your exam preparation strategy effectively.
What You Will Practise Here
Fundamental properties of sound waves
Types of sound waves: longitudinal and transverse
Key formulas related to speed, frequency, and wavelength
Applications of sound waves in real life
Understanding the Doppler effect and its significance
Sound wave interference and resonance concepts
Diagrams illustrating sound wave propagation
Exam Relevance
The topic of sound waves is frequently featured in CBSE, State Boards, NEET, and JEE exams. Students can expect questions that assess their understanding of the properties and behaviors of sound waves, often in the form of multiple-choice questions. Common question patterns include numerical problems, conceptual applications, and theoretical explanations, making it essential to be well-prepared with important sound waves questions for exams.
Common Mistakes Students Make
Confusing the characteristics of longitudinal and transverse waves
Misapplying formulas related to speed, frequency, and wavelength
Overlooking the significance of the Doppler effect in practical scenarios
Failing to interpret diagrams correctly during exams
FAQs
Question: What are sound waves?Answer: Sound waves are vibrations that travel through a medium, such as air or water, and can be heard when they reach a person's or animal's ear.
Question: How do I calculate the speed of sound?Answer: The speed of sound can be calculated using the formula: speed = frequency × wavelength.
Now is the time to enhance your understanding of sound waves! Dive into our practice MCQs and test your knowledge to ensure you are well-prepared for your upcoming exams. Start solving today and boost your confidence!
