Class 8 Exam > Class 8 Notes > Science Class 8 > HOTS Questions: Sound
Class 8 Science Chapter 11 HOTS Questions - Sound
Multiple Choice Questions
Q1. In which medium sound travels faster ?(a) Solid
(b) Liquid
(c) Gas
(d) None of these
Q 2. The unit of quantity on which pitch of the sound depends is :
(a) metre
(b) Hertz
(c)metre/second
(d) second
Q 3. The unit of quantity on which loudness of found depends is :
(a) second
(b) Hertz
(c)metre/second
(d) metre
Q 4. Pitch of high frequency sound is :
(a) zero
(b) low
(c) high
(d)infinite
Q 5. Voice of a friend is recognized by its :
(a) Pitch
(b) quality
(c) Intensity
(d) velocity
Q6.What part of the human body vibrates to produce sound?
(a) Heart
(b)Lungs
(c) Vocal cords
(d) Brain
Q7.Which of these is an example of a sound that is pleasant to the ears?
(a) Traffic noise
(b) Construction sound
(c) Musical instrument
(d) Horns of buses and trucks
Q8. What is the audible frequency range for human hearing?
(a)2 Hz to 20 Hz
(b) 20 Hz to 20,000 Hz
(c)200 Hz to 2,000 Hz
(d) 20 kHz to 20 MHz
Q9.What is the time period for vibrations when a mosquito vibrates its wings at a rate of 500 vibrations per second?
(a) 0.002 seconds
(b) 0.02 seconds
(c) 0.2 seconds
(d) 2 seconds
Q10.Which of the following statements is true regarding sound?
(a)Sound can travel through vacuum.
(b) Sound needs a medium to travel.
(c) Sound cannot travel through solids.
(d)Only gases can transmit sound.
Ans:1-a 2-b 3-d 4-c 5-a 6-c 7-c 8-b 9-a 10-b
Fill in the blanks
1. When sound travels through air, it moves the air particles _______ and ________.
2. Sound can travel through _______, _______, and _______ but not through a vacuum.
3. A loudness of sound is measured in _______.
4. The _______ of a sound is affected by the amplitude of the vibrations that produce it.
5. During an experiment, if you suck air out of a tumbler, the sound becomes _______.
6. A tuning fork, when struck, produces sound due to the _______ of its prongs.
7. The _______ of sound depends on its amplitude.
8. In the human ear, the _______ vibrates in response to sound waves.
9. Sound cannot travel through a _______, which is a space devoid of any air.
10. Musical sounds differ from noise because they are _______ to the ear.
Ans:1. back, forth 2. solids, liquids, gases 3. decibels 4. loudness 5. fainter 6. vibration 7. loudness 8. eardrum 9. vacuum 10. pleasant
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FAQs on Class 8 Science Chapter 11 HOTS Questions - Sound
| 1. What is sound and how does it travel? |  |
Ans. Sound is a type of energy that is produced by vibrating objects and travels through a medium such as air, water, or solids as longitudinal waves. The vibrations create pressure waves that move through the medium, allowing us to hear sounds when they reach our ears.
| 2. What are the different types of sound waves? | |
Ans. Sound waves can be classified into two main types: longitudinal waves and transverse waves. Longitudinal waves, in which the displacement of the medium is parallel to the direction of wave propagation, are common in sound. Transverse waves, where the displacement is perpendicular to the direction of wave travel, are not typical for sound in air but can occur in solids.
| 3. How does the frequency of a sound wave affect its pitch? | |
Ans. The frequency of a sound wave refers to the number of vibrations or cycles per second, measured in hertz (Hz). Higher frequencies correspond to higher pitches, while lower frequencies correspond to lower pitches. This means that a sound wave with a frequency of 1000 Hz will be perceived as a higher pitch compared to a sound wave with a frequency of 200 Hz.
| 4. What is the relationship between sound intensity and loudness? | |
Ans. Sound intensity is a measure of the power carried by sound waves per unit area, typically expressed in watts per square meter. Loudness, on the other hand, is the human perception of the intensity of sound. Generally, as the intensity of a sound increases, the perceived loudness also increases, but this relationship is not linear; the human ear perceives loudness on a logarithmic scale.
| 5. How does temperature affect the speed of sound? | |
Ans. The speed of sound is affected by the temperature of the medium through which it travels. In general, as the temperature increases, the speed of sound also increases. This is because higher temperatures provide more energy to the molecules in the medium, allowing them to vibrate and transmit sound waves more quickly.
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